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Service Manual
Nakamichi
Nakamichi
620
power amplifier
CONTENTS
1.
2.
3.
General
Principle of Operation
2. 1.
Power Supply
2. 2.
Power Block Pre-stage
2. 3.
Power Block Output Stage
2. .4.
Peak Power indicator
Removal Procedures
3. 1.
Cabinet Ass'y
3. 2.
Rear Panel Ass'y
3. 3.
Lamp
3. 4.
4.
5.
6.
7.
3.
9,
10,
11.
Switch
3. 5.
Power Block Ass'y
3. 6.
Jack
3. 7.
Indicator P.C.B. Ass'y
3. 8.
Relay P.C.B. Ass'y and Cement Resistor
3. 9.
Diode and Output P.C.B. Ass'y
3.10.
Transformer and Capacitor
Readjustment of Power Block
Mounting Diagram and Parts List
5. 1. • Power Block Ass'y
5.1.1.
Power Block P.C.B. Ass'y
5.1.2
Power Transistor P.C.B. Ass'y
5. 2.
Output P.C.B. Ass'y
5. 3.
indicator P.C.B. Ass'y
5. 4.
Indicator Sw. P.C.B. Ass'y
5. 5.
Indicator Lamp P.C.B. Ass'y
5. 6.
Power Lamp P.C.B. Ass'y
5. 7.
Relay P.C.B. Ass'y
Mechanism Ass'y and Parts List
6. 1.
Synthesis (A01)
6. 2.
Mechanism Ass'y (B01)
6. 3.
Cabinet Ass'y (B02)
6. 4.
Main Chassis Ass'y (C01)
6. 5.
Front Panel Ass'y (C02)
6. 6.
Rear Panel Ass'y (C03)
6. 7.
Indicator Lamp Ass'y (C04)
6. 8.
Power Lamp Ass'y (C05)
Wiring Diagram
Performance Data
Block Diagram
Schematic Diagram
Specifications
2
3
3
3
4
6
7
7
7
7
7
8
8
8
8
8
9
10
11
11
11
11
11
13
13
13
14
14
15
15
16
17
18
19
19
20
20
21
22
23
24
26
f
)
1
*
I
)
|
V
•
1. GENERAL
Nakamichi 620 control functions are shown below.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Peak Power Indicator (L ch)
Peak Power Indicator (R ch)
AC Power Indicator
Power Switch
Power Indicator Threshold Selector
Switch (High)
Power Indicator Threshold Selector
Switch (Low)
Fuse
Voltage Selector
Output Terminals
input Jacks
Fig. 1.1
Fig. 1.2
CAUTIONS
The Nakamichi 520 incorporates iarge capacitances. it is
very dangerous to access the capacitor for a duration of
about 3 minutes after ihe power switch has been turned
off because of incompiete discharging. Use extreme care
when accessing the capacitor for repair purposes.
Never short the capacitor terminals with a screwdriver or a
similar tool after the power switch is turned off, with an
attempt to discharging the capacitor. (Shorting the terminal in such a way can meit the shorted point leading to
a hole, and will give adverse effects on the capacitor
itself.)
The recommended way :o discharge the capaciior as
quickly as possible is to turn off the power suppiy with
sound emitting through the loudspeaker or to discharge
the capacitor with resistances of 10012 — 300H, approx.
20W.
Voltage Selector
Change pverto 100V, 117V, 220V or 240V.
240V
=
=
2 20V = •
—
I
I 17 V
10
• lo
I00V
240 V
when the power switch is turned on, and then by shorting
the resistance at a relay contact and suppiying the input
voltage directly to the transformer primary.
A 130"C thermal fuse is contained within the transformer
and protects it from unusual heating.
lf the fuse is blown, it is necessary to replace the transformer itself.
2.2.
=
240V—
81 j
--H00V
220V—
117V
7V
1
2" 20 V—
J
l
0
0
—-\ UV
220V
i r - II7V
240V=^!
o
!
0
220 V— IJ
'•—100V
1OOV
Fig. 1.3
2. PRINCiPLE OF OPERATION
2.1.
Power Block Pre-stage
Refer to Fig. 2.2.
As all the Output stage consists of emitter-followers, the
voltage gain is 1. Therefore, the gain required for power
amplifier and NFB is obtained at the pre-stage. Generally,
an increase in the number of transistor stages of an amplifier circuit increases distortion and phase shift. In large
current amplification as seen with a power amplifier, a
certain extent of distortion cannot be avoided and should
be limited through use of NFB. However, excessive NFB is
likely to cause unstable amplification as a result of phase
shift in the amplifier or differences in Soudspeaker impedance. This is one of the drawbacks inherent to an NFB
amplifier.
I!7V
Power Supply
Refer to Fig. 2.1.
The power transformier used in the 620 is of a troidai
type. Generally, a troidai transformer is attacked by large
rush current when the power switch is turned on. For the
620, such rush current is reduced by suppiying input
voltage to the primary of the transformer via a resistor
(6.8f2, 10 watts) only during the time of approx. 20 msec
The power amplifier used in the 620 employs 8 transistors, of which only two serve for voltage amplification
and the remaining six are used to provide the former two
with the best operating conditions. A gain of approx.
100dB is obtained through these two transistors to perform power amplification and NFB. The amplifier of this
configuration assures stable NFB with !ow noise and Iow
distortion and with little phase shift.
Q001 and Q007 are for voltage amplification; Q002 and
Q003 form a current mirror circuit (the same current at
both collectors); Q005 and Q008 provide a constant-current source; Q006 is for impedance conversion (emitterfollower); Q004 and Q001 make up a differential amplifier circuit. Thus, stable NFB is applied through a
circuitry using these transistors.
C005 determines the high-band characteristic of the voltage amplifier to prevent NFB from becoming unstable
because of unbalanced Performance. R016 is a resistor for
NFB.
2.1
2.3.
Power Block Output Stage
In the Nakamichi 620, for making a bias voltage, Varistor
used *in the conventional design of amplifier is replaced
with transistor base-emitter so that the 620 design improves bias stabiIity (against temperature or current
changes) with Iower distortion.
Especially for a class B push-pull amplifier, distortion
cannot be reduced unless the positive and negative signal
amplifiers are well balanced. The amplifier in the 620,
however, is best balanced thanks to the vertically and
horizontally Symmetrie configuration as shown in Fig.
2.3. This cireuit allows distortion of only 0.1% at 1KHz
100 watts Output even without NFB. This degree of
distortion is Iow enough to make the amplifier used as a
high-fidel ity unit even if it is given no NFB.
Fig. 2.4 shows that a change in current flowing across the
diode varies the terminal voltage and that ED changes with
signal current. These changes result in the generation of
distortion. It is a matter of course that signal current
flowing across the diode will produce distortion. See Fig.
2.3. Transistors Q009, Q011, Q010 and Q012 that
generate bias voltage form an emitter-follower cireuit of
class A Operation. Thus this cireuit does not induce
distorted Signals.
Unless corrected perfectly against temperatures, the bias
voltage of power amplifiers in the class B amplifier will
increase distortion at Iow temperature or become unstable
at high temperature. !t may safely be said that temperature compensation of a transistor can be more properly
and effectively carried out by the transistor of the same
strueture than a diode.
For an ordinary class B amplifier, crossover distortion is
reduced by increasing idling current thus overlapping the
operating ranges of the positive and negative transistors.
The overlap portion acts as a class A amplifier. Generally,
the degree of amplification decreases where a change takes
place from class A to B and no linear curve is obtained as
shown in Fig. 2.5 (A). However, if the cireuit shown in
Fig. 2.3 is current-driven, a linear curve can be obtained
at the point of change from class A to B as shown in Fig.
2.5 (B).
'UTP'JT
Fig. 2.2
+ Vcc
OUTPUT
INPUT O
-Vcc
Fig. 2.4
Class B
Class A
Class B Class A Class B
Class B
(B)
(A)
Fig. 2.5
INPUTO
Fig. 2.3
Fig. 2.6 illustrates a simplified version of the circuit
shown in Fig. 2.3.
Since the direct-coupled two-stage emitter-foliowers can
be regarded to be one emitter-follower having greater
current amplification, the Q009-Q011, Q010-Q012,
Q017-Q019, and Q018-Q020 will be designated respectively to be Q1, Q2, Q3 and Q4 as shown in Fig. 2.6.
When id is applied with the input used as current-source,
ii and i 2 are given as foliows because of the Q1 and Q2
input impedances:
Input impedance of Q1
Input Impedance of Q2
Therefore;
•
_
02(04f2
0 i ( 0 3 r i + r3)
«2
«0
+
+
ßi (03 n
ß2 (04 xi
r4)
r4)
id
r3J
Fig. 2 . 6
Class B
+T3)
ßiißs n
r3)
+ 02 (04 r 2 + r 4 )
=
+
+ Vcc
Class A
Class
•id
~>4 X2
=
-ßo id
0 1 0 2 0 3 (04 r 2 + r 4 )
0i(03ri
01020304
0i03(ri
3
)
id
+r4)
+
{(r
+ 010204(03 r i + r
2
(n
r3
— ßz ßA \6~- ßo id
(V i i - O )
id
+r3/03>
Fig. 2.7
If 0 of the Q1-Q3 pair is equal to that of the Q 2 - Q 4
pair, then 0i03=j32ß4 (assumed as0o)The following equation will be obtained:
ßp2 i (r 2 +r 4 /j3 4 ) + ( n + r3/<33) }
ßo 1 ( n + r 3 / p 3 ) + (r 2 +rjß4)
\
.
'°
-
id
ßo id
As a result, the same gain is obtained over the entire ränge
as shown In Fig. 2.7.
Thus, the rate of current ampüfication in the idling current ränge (Class A) is quite the same as that in the ciass B
amplifier. It must be noted, however, that the idling
current is not included in the conditions for making the
equation valid. In other words, a change in idling current
will neither change the Iinearity of curves nor produce
distortion.
Q013 and Q014 form a constant-current source; D005
and D006 are for temperature compensation; D003 and
D004 prevent reverse-biased voitage from being applied in
abnormal State; Q015 and Q016 form a current limiter
that prevents overloading on the power transistor.
2.4.
Peak Power Indicator
Fig. 2.8 and Fig. 2.9 show, respectively, the circuit diagram and time chart of the peak power indicator. This
circuit Switches the peak power indicator of R-channel or
L-channel to red or green depending upon the Output
power. level.
The LOW and HIGH power indicator threshoid selectors
located on the rear panel of the 620 select 1/5/25 watts
and 25/50/Max. watts power levels, respectively. The
green iamp glows for output power levels of 1,5,25 watts
(LOW) or more, while the red Iamp glows for output
power leveis of 25, 50 or Max. watts (HIGH). (Ref. 8 ^
ioad. if a 1617 loudspeaker is to be used, divide the
indicated power levels by two.)
The green iamp remains off while the red lamp is on. if
both switches are set for 25 watts, the peak power indicator lamps will glow red only at that power point The
peak power indicating lamps are extremely fast in
responding to transmit Signals. A 0.1 millisecond power
pulse will' cause the peak indicator to light and stay " o n "
for 0.3 second.
AMP1 is a full-wave rectifier for input waveforms (nameiy
output waveforms to the loudspeaker).
AMP2 is a peak detector.
Capacitor C151 and resistor R156 determine the time
constant for holding the voltage of which peak has been
detected.
AMP3 and AMP4 form a comparator that compares the
output voltage of AMP2 with reference voltage (corresponding to power ievel 1, 5, 25 or Max. watts).
AMP3 and AMP4 are operational amp. ICs with open
collector output. Output of these amplifiers is - 5 V if the
AMP2 output voltage is Iower than the reference voltage.
In this State, transistors Q151 and Q153 are cut off and
the lamps are off.
In AMP4, if the AMP2 output voltage exceeds the reference, the AMP4 output is opened and base current flows
into Q153 via resistor R163. As a result, Q153 is on and
the indicating lamp glows red.
Then, the coilector of Q153 is dropped to —5V and no
current flows to Q151 via R164. Thus Q151 is cut off and
the green lamp goes out.
AMP4 has hysteresis in its input/output characteristic.
0151, 0152, and Q153, Q154 make up a sort of
monostable multivibrator.
When 0151 is on and Q152 is therefore on, a positive
differential pulse is applied to the Q151 base via capacitor
C152. Thus Q151 is held " o n " for a certain time.
Q153 and 0154 operate in the same manner as above.
R157 (R165) is a resistor causing a lamp to be pre-biased.
In AMP3, if the AMP2 output voltage exceeds the reference, the AMP3 output is opened and base current flows
into Q151 via resistor R164. As a result, Q151 is on and
the indicating lamp glows green.
AMP 1
AMP 2
ov
+ 6V
AMP 3 (L0W.5W)
_5V
+ 6V
AMP 4 (HIGHI50W)
_5V
+ 6V
Q-151
COLLECTOR
GREEN
_sv
+ 6V
Q153
COLLECTOR
_5V
Fig. 2.9
infinf
?[|]
^"7
--5V
Fig. 2.8
=-3.__5W
13K//390K
F.! —25W—6.8K//55K
-4
^5
25\V
50 W
6.8K//56K
3.3K//1OK
3. REMOVAL PROCEDURES
3.1. Cabinet Ass'y
Refer to Fig. 3.1 and remove F01 and F02.
3.2. Rear Panel Ass'y
Remove cabinet ass'y (item 3.1). Refer to Fig. 3.2 and
remove F01 and F02.
F03
F02-
3.3. Lamp
Remove rear panei ass'y (3.2). Refer to Fig. 3.3 and
remove F01 and F02, then remove F03, F04and F05,
F01
ÖT
3.4. Switch
Remove rear panel ass'y (3.2). Refer to Fig. 3.4 and
remove F01 and F02, then remove F03 and F04 (power
sw.), and F05 and F06 (indicator sw. ass'y).
/
,#»
Ü
3.5. Power Block Ass'y
Remove cabinet ass'y (3.1). Refer to Fig. 3.5 and remove
F01 t h r o u g h F04.
Fig. 3.3
-F01
F01-
F06-
FÖ1
Fig. 3.4
Fig. 3.1
F01
FO3
-FO1
Fig. 3.5
Fig. 3.2
3.6. Jack
Remove rear pane! ass'y (3.2). Refer to Fig. 3.6 and
remove F01 through F04 (2-pin jack) and F05 through
F07 (push terminal).
FOT
3.7. Indicator P.C.B. Ass'y
Remove cabinet ass'y (3.1). Refer to Fig. 3.7 and remove
F01 through F03.
3.8. Relay P.C.B. Ass'y and Cement Resistor
Remove cabinet ass'y (3.1). Refer to Fig. 3.8 and remove
F01 and F02 (cement resistor), and F03 through F05
(relay P.C.B, ass'y).
3.9. Diode and Output P.C.B. Ass'y
Remove cabinet ass'y (3.1). Refer to Fig. 3.9 and remove
F01 and F02 (diode), and F03 and F04 (output P.C.B,
ass'y).
F06
Fig. 3.8
— F03
F02
— FO4
F02
F01
F02
Fig. 3.9
Fig. 3.7
3.10. Transformer and Capacitor
Remove cabinet ass'y(3.1). Refer to Fig. 3.10 and remove
F01 through F06, F07 and F08 (transformier), F09
through F11 (capacitor) and F12 through F14 (capacitor).
F02
Fig. 3.10
4. READJUSTMENT OF POWER BLOCK
The 620 uses no semi-fixed parts to enhance reliability. As
long as all parts meet the specification, the published
characteristics can be obtained without readjustment.
Generally, no readjustment is required if only defective
parts are replaced at repair.
Observe the following precautions when repairing defective parts:
(2)
(3)
4.1.
Relocating a wiring can cause larger distortion,
Do not relocate the wiring,
(4)
4.2.
Fully tighten or tetighten the screws on the chassis
to decrease the resistance between GND terminals.
4.3.
If a new semiconductor is installed in the power
block, a perfect balance should be held between it
and the existing semiconductors in the block. An
imperfect balance can cause larger distortion or unwanted oscillation.
To maintain a good baiance, connect an 812 100W
load resistance to the output terminal, measure
distortion and check that it meets the following
requirements: (In this case, the residual distortion
factor of the instrument shouid be Iower than the
specified value.)
(1) Output 1 watt, 1 and 10 KHz input Signals;
less than 0.005%
(2) Output 100 watts, 1 and 10 KHz input signais;
less than 0.007%
Described here are the possible causes for defects
and the recommended remedial Steps:
(1) The characteristic of one transistor does not
match that of the other transistor when they
are used as a pair.
Usually, the idling current of power transistors Q019 and Q020 is approx. 20mA 30mA. If it is Iower, the distortion at 1 watt
will increase. In such a case, solder additional
33K12 parallel to R018 and R019 (33Kft),
respectively, from the dip side of the printed
circuit board.
Improper locations of power supply wiring
will increase the distortion at 100 watts.
If oscillation occurs, the distortion will become large at both 1 watt and 100 watts.
Sometimes, oscillation cannot be observed
even on a synchroscope if it invoives frequencies as high as several MHz. Osciilation
may have occurred if the distortion is large
though the external operating voltage remains
normal. Try the following Steps to eliminate
oscillation:
(a) Add ceramic capacitors of the same
capacity parallel to C010 and C011
(0.047^, 100V).
(b)
Increase C013 (100pF) (by adding a
47pF in parallel) or decrease the capacitance (by repiacing it with a 47p or
removing it. If C013 is removed, make a
short circuit by jumper wire.)
(c)
Short R017 (2712) or increase it to
4712.
2
L
s--8
i
1
o
x
rjL*
cofJ
H „ I M f?
H ff • i # ! f
rvjwtn: öLUUr.
vy
"
j
Fig. 4.
10
5. MOUNTING DiAGRAM AND PARTS LIST
Note: Mounting diagram shows a dip side view of the printed circuit board.
5.1.
Power Block Ass'y
5.1.1. Power Block P.C.B. Ass'y
1
A
R038 0.22 5W
/l
_
a 0 3 4
g ? < ? - 9 . .
S
R020 220 Ö-^
T°
Ö
°
1 K
"
N
~ *0^™T^*
O°
^
...
RO21
O
1
?
E
RÜ4Q
B
RO39 0 22 5W
.
6
Q
O
R
°
3
m
JL "- 2SD555
Q014
4.7
2 2
O
8
E
o^E^L^0^
i\i°^O??ZH^
-
33OOP
HhO
J^
RQ4H
0
O
2S733 K
|\
4.7
O ^ % ^
Q016
*
/
1^
^
22
r
\
l\
</ I
R022
i
|^
j
2SB6OO
?
| Ö
Sf
2 1
51K
"RO35""'iK
"
ä 9
^^2^7^
__
...
R024 51K
? 9
Q
"O
-fsT
2 6
^^-
2
"^^^7
? O £ <f
Ä
QOO9
2SB526
Fig. 5.1
Note: 1.
Resistors R018, 019 and capacitor C013
2.
Diode1S1555,transistors 2SB628and 2SD608
are the same as diode FDH-999, transistors
2SB536and 2SD381, respectively.
( * marks) are the parts for adjustment, and
so typical value is shown. Refer to " 4 . Readjustment of Power Block".
5.1.2. Power Transistor P.C.B. Ass'y
II
I |
I I
B
L
I
I
I
I
I I
i
I
!!
!
pol f"ö"i
Q011
2SB628
or2SB536
!
i l
I
\ ! C) ! O
QO18
2SB628
ir2SB536
v
\
\
II (
\
\
\
0017
2SD608
or2SD38i
2SD555
Fig. 5.2
Output PX.B. Ass'y
/
-J
?
i
31 -
|
-
-L-OUT
-L-INDICATOP BOARD
R2O1 n.öft 2W
-R-INDICATOR BOARD
R-101
3.8Q 2W
Fig. 5.3
11
!
^j
^
a I I I
I I I
4
\ I
Q010
2SD608
r2SD38i
0019
0020 2SÜ60"cT
5,2.
I
1 (
i !
\
I
; I I I
I I I
!
I
l
Q009
2SB628
-:,r2SB536
B
!
I
^~~N I
i
0012
2SD608
or2SD:81
Schematic
Ref. No.
Part No.
Schematic
Ref. No.
Description
JA03107A
Power Block Ass'y
BA03781A
BA03780A
0E00231A
0E00026A
Power Block P.C.B. Ass'y
Power Transistor P.C.B. Ass'y
Screw M2.6x8 Philips Pan Head
FT (4 pcs.)
Washer 2.6mm Spring (4 pcs.)
BA03781A
Power Block P.C.B. Ass'y
0B07676B
0B06078A
Power Block P.C.B.
Transistor
2SC1400
0B06074A
Transistor
2SA750 (1)
0B06096A
0B06097A
0B06098A
0B06099A
0B06100A
0B06013A
0B06091A
Transistor" '.Transistor.';;;
Transistor
Transistor .
Transistor- Transistor-:::'-'
Silicon Diode
2SB536 (K, L, M)
2SD381 (K, L, M)
2SB630 (Q, R, S)
2SD610 (Q, R, S)
2SC945A (K, P, Q)
2SA733
FDH-999
C007,014
015
C008
Part No.
0B05882A
Ceramic Capacitor
0B05852A
Electrolytic Capacitor
0B05883A
0B05892A
0E00566A
Ceramic Capacitor 0.047M 100V M
Ceramic Capacitor 100P
50V K
Screw M3x6 Philips Pan Head (4 pcs.)
Q016
0001,002
003,004
005,006
007,008
009,010
011,012
R001,009
R002
0B05878A
R017
R018,019
R020,025
R021,024
R022, 026
030,031
R023, 027
R028,029
R032,037
R033, 034
035,036
R038,039
R040,041
R042
C001
0B05875A
0B05509A
0B01933A
0B05876A
0B05579A
0B01679A
0B05615A
0B05580A
0B01857A
Carbon
Carbon
Carbon
Carbon
0B05871A
0B05891A
0B05698A
0B05864A
C002
C003
C004
C005
C006, 016
017
0B05893A
0B05880A
0B05798A
0B05806A
0B05881A
Cement Resistor 0.22 5W
Carbon Resistor 4.7
ERD-14 TJ
Carbon Resistor 1.5K ERD-14 TJ
Electrolytic Capacitor
47 M 16V M (MS)
Ceramic Capacitor 680P
50V K
Ceramic Capacitor 470P
50V !<
Ceramic Capacitor 10P
50V K
Ceramic Capacitor 22P
50V K
Ceramic Capacitor 3300P
50V M
Resistor 100
Resistor 22K
Resistor 2.2
Resistor
1K
ERO-25
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
CKG
TJ
TJ
TJ
TJ
TJ
ERD-14
ERD-14
ERD-14
ERD-14
TJ
TJ
TJ
TJ
L101,201
R101,201
R102, 202
C101,201
F101,201
ERO-25 CKG
12
.o.
1 1 —
f\ 71 O
10V
/ A
\
Nut Hex. M3
Washer 3mm (Fiber)
BA03780A
Power Transistor P.C.B. Ass'y
0B07677A
0B06094A
0B06095A
0B06096A
0B06097A
0B06083A
0B06081A
0E00731A
0E00732A
Power Transistor P.C.B.
Transistor
2SB536 (L)
Transistor
2SD381 (L)
Transistor
2SB536 (K, L, M)
Transistor
2SD381 (K, L, M)
Transistor
2SD555
Transistor
2SB600
Power Transistor Heat Sink (1 pce.)
Power Transistor Bush
(4 pcs.)
Transistor Bush
(6 pcs.)
Spring Pin
(4 pcs.)
Screw M4x15 Philips Pan Head
(4 pcs.)
Washer 4mm Spring
(4 pcs.)
Nut Hex. M4
(4 pcs.)
Washer 3mm Spring
(6 pcs.)
Nut Hex. M3
(6 pcs.)
Screw M3x12 Philips Binding Head
(6 pcs.)
Washer 4mm
(4 pcs.)
Washer 3mm
(12 pcs.)
BA03777A
Output P.C.B. Ass'y
0B07674B
BA03784A
0B05872A
0B05870A
0B01602A
0B08239U
0J03510A
0E00166A
0E00606A
Output P.C.B.
Output Coil Ass'y
2.3MH
Metai Oxide Resistor 6.8
2W
Cement Resistor
6.8
10W
Mylar Capacitor
0.33M 50V K
Fuse
5A
(2 pcs.)
Output P.C.B. Holder
(1 pce.)
Screw M2x4 Cylinder Head (2 pcs.)
Screw M3x6 Philips Pan Head
(3A) (3 pcs.)
0E00720A
0E00721A
0E00723A
0E00718A
0E00741A
TJ
TJ
TJ
TJ
TJ
TJ
TJ
TJ
TJ
TJ
JY 1
50V M
UtUU/1oA
0J03505A
0J03488C
0J03493A
0J03494A
0J03560A
0E00719A
R016
R003, 004
R005
R006
R007
R008,012
R010
R011
R013,014
R015
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
Q009
Q010
Q011,018
Q012, 017
Q019
Q020
Carbon Resistor 10K
Carbon Resistor 1.8K
Carbon Resistor 1.2K
Carbon Resistor 82
Carbon Resistor 47K
Carbon Resistor 27K
Carbon Resistor 560
Carbon Resistor 39K
Carbon Resistor 15K
Carbon Resistor 56
Metal Film Resistor
360
Metal Film Resistor
10K
Carbon Resistor 27
Carbon Resistor 33K
Carbon Resistor 220
Carbon Resistor 51K
Carbon Resistor 22
0B01888A
0B05614A
0B05623A
0B05631A
0B05641A
0B05743A
0B05575A
0B01854A
0B01683A
0B05890A
0B05877A
0.022M
1000M
C010,011
C013
r\ ar\r\~) *i o A
Q001,004
005
Q002,003
006
Q007
Q008
Q013
Q014
Q015
Description
(4 pcs.)
(2 pcs.)
5.3.
Indicator P.C.B. Ass'y
Note: Diode 1S1555 is the same as FDH-999
Fig. 5.4
5.4.
Indicator Sw. P.C.B. Ass'y
5.5.
'
oi
| o
| O
o !
O |
Indicator Lamp P.C.B. Ass y
• ( 3 ) GRN
I ? ü i
Fig. 5.6
7
?
"0 iNDICATÜR BOARD)
Fig. 5.5
13
5.6.
Power Lamp P.C.B. Ass'y
5.7.
Reiay P.C.B. Ass'y
ORN
AC3V.
Fig. 5.7
Fig. 5.8
Schematic
Ref. No.
10051,052
iC053
Q151, 153
251,253
Q152, 154
252, 254
DZ051
D051
D151, 152
251,252
D153, 154
155, 156
253, 254
255, 256
R051
R052
R053, 054
R151,154
161,251
254, 261
R152,252
R153, 164
253, 264
R155, 255
R156, 256
R157, 165
257,265
R158, 166
Schematic
Ref. No.
Description
Part No.
BA03776A
Indicator P.C.B. Ass'y
0B07678C
0B06086A
0B06087A
0B06100A
Indicator P.C.B.
iC
1458
iC
3302
Transistor
2SC945A (K, F Q)
0B06013A
Transistor
2SA733
0B06089A
0B06088A
0B06076A
Silicon Diode
Silicon Diode
Silicon Diode
XZ062
SIRBA
1S1553
0B06091A
Silicon Diode
FDH-999
0B05623A
0B05743A
0B05622A
0B01889A
Carbon
Carbon
Carbon
Carbon
0B05668A
0B01888A
Carbon Resistor
Carbon Resistor
0B01856A
0B05625A
0B05698A
Carbon Resistor 8.2K ERD-14 TJ
Carbon Resistor 220K ERD-14 TJ
Carbon Resistor 1 5K ERD-14 TJ
0B05509A
Carbon Resistor
Resistor 1.2K
Resistor 27K
Resistor 2.2K
Resistor 100K
Description
BA03779A
Indicator Sw. P. C.B. Ass y
0B07679B
0B05641A
0B05776A
0B05560A
0B05676A
0B01682A
0B05508A
0B01681A
0B01888A
0B05629A
0B07105A
0B08237A
0J03501A
0E00166A
indicator SW. P. C.ß.
Carbon Resistor 47K
Carbon Resistor
1M
Carbon Resistor 18K
Carbon Resistor 390K
Carbon Resistor 6.8K
Carbon Resistor 56K
Carbon Resistor 3.3K
Carbon Resistor 10K
Carbon Resistor 2.7K
Slide SW.
4P-H Connector Ass'y
(1 pce.)
Indicator SW. P. C.B. Holder (1 pce.)
Screw M2x4 Cy linder Head (4 pcs.)
BA03783A
indicator Lamp P.C.B. Ass'y
0B07675A
0B08234U
0B08235A
Lamp P.C.B.
Lamp
12V 60mA (2 pcs.)
3P-H Connector Ass'y C
(1 pce.)
BA03782A
Power Lamp P.C.B. Ass'y
0B07675A
0B08234U
Lamp P.C.B'
Lamp
0B08238A
3P-H Connector Ass'y D
BA03778A
Reiay P.C.B. Ass'y
Q301
0B07673B
0B06074A
Relay P.C.B.
Transistor
Q302
D301
D302
R301
0B06099A
0B06076A
0B06077A
0B05650A
Transistor
2SD610
Silicon Diode
1S1553
Siiicon Diode
1S2358
Carbon Resistor 12K ERD-14 VJ
R302
R303
R304
0B05561A
0B01920A
0B01921A
Carbon Resistor 18K ERD14 VJ
Carbon Resistor 100K ERD-14 VJ
Carbon Resistor 330K ERD-14 VJ
R305
R306
R307
0301
RL301
0B05565A
0B01879A
0B05563A
0B05586A
0B08228A
Carbon Resistor 1.2K ERD-14 VJ
Carbon Resistor 33K ERD-14 VJ
Carbon Resistor 56K ERD-14 V J
Mylar Capacitor 0.068M 50V
K
Relay HCI-TMCD
100VDC
R055
R056
R057
R058
R059,061
R060, 062
R063
R064
R065
SW051,052
TJ
TJ
TJ
TJ
ERD-14
ERD-14
ERD-14
ERD-14
Part No.
82K ERD-14 TJ
10K ERD-14 TJ
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
ERD-14
TJ
TJ
TJ
TJ
TJ
TJ
TJ
TJ
TJ
12V 60mA (1 pce.)
(1 pce.)
33K ERD-14 TJ
oco 9fifi
ZOO, ZDD
R159, 160
167,168
259,260
0B01846A
Carbon Resistor 4.7K ERD-14 TJ
R162, 262
R163, 263
0B05776A
0B05771A
Carbon Resistor
Carbon Resistor
C051
005 2
0151,251
0152, 252
0B01835A
0B01412A
0B05598A
0B05819A
Electrolytic Capacitor 2200M
Electrolytic Capacitor
10M
Tantalum Capacitor 2.2M
Electrolytic Capacitor 4.7M
0153,253
0B05861A
Electrolytic Capacitor 6.8M
0B08185A
0B08236A
3P-T Post
4P-T Post
1 M ERD-14 TJ
12K ERD-14 TJ
18V
16V
25VM
16V
n 11\ n o \
Ivi
\IVIO/
1 6V
M (MS)
(3 pcs.)
(1 pce.)
14
2SA750
6. MECHANISM ASS'Y AND PARTS LIST
6.1.
Synthesis (A01)
-L01
-L02
L01
L02.
p
&
L01
L02
01
(BOI)
Fig. 6.1
Schematic
Ref. No,
Part No.
AO1
Description
Schematic
Ref. No.
Q'ty
L01
L02
L03
L04
L05
0B05122A
0B05123A
0B05124A
0B05125A
0B05126A
0B05127A
0E00733A
0J03556A
0E00657A
0E00677A
0E00606A
L06
L07
L08
L09
L10
0E00718A
0E00723A
0E00732A
0E00659A
0E00700A
L11
0E00593A
L12
L13
0E00197A
0E00037A
Synthesis
01
02
L01
JA03103A
HA03634A
0E00594A
L02
1
1
5
0E00197A
Mechanism Ass'y
Cabinet Ass'y
Screw M3x8 Philips Binding head
(Bronze)
Washer 3mm (Bronze)
301
JA03103A
Mechanism Ass'y
1
01
02
03
04
05
06
07
08
09
10
11
0H03454A
HA03658A
0H03456B
0M03683B
BA03776A
JA03104A
JA03106A
JA03105A
JA03108A
JA03107A
0J03506A
Handle (B)
Front Panel Ass'y
Light-intersepting Shade
Rear Name Plate
Indicator P.C.B. Ass'y
Main Chassis Ass'y
Indicator Lamp Ass'y
Power Lamp Ass'y
Rear Panel Ass'y
Power Block Ass'y
Rear Angle
Cord with Terminal A
2
1
0B05121A
5
2
1
1
1
2
1
1
2
1
1
15
Description
Part No.
Cord
Cord
Cord
Cord
Cord
Cord
with
with
with
with
with
with
Terminal
Terminal
Terminal
Terminal
Terminal
Terminal
B
C
D
E
F
G
M4x12Bolt(Hex.Socket Head)
Washer 4mm (Black)
Screw M3x5 Philips Pan Head
Washer 3mm (Black)
Screw M3x6 Philips Pan Head
(3A)
Nut Hex. M3
Washer 3mm Spring
Washer 3mm
Screw M3x10 Philips Pan Head
Screw M5x16 Philips Pan Head
(2A)
Screw M3x6 Philips Binding
Head
Washer 3mm (Bronze)
Earth Lug B-5
Q'ty
1
1
1
1
1
1
6
5
3
3
6
5
5
5
5
4
4
4
2
6.2.
Mechanism Ass'y (B01)
01
01
L01
L02
L01
Fig. 6.2
16
6.3.
Cabinet Ass'y (B02)
01
L01
Fig. 8.3
Schematic
Ref. No.
Part Mo.
802
HA03634A
Cabinet Ass'y
1
01
02
03
0A03254A
0A00518C
0M03339A
0M03674A
0E00552A
0E00701A
1
4
1
1
4
4
0E00253A
0M03619A
Cabinet
Gum Foot
Caution Labe!
Shield Foil 610
Nut Hex. M3
Screw M3x'10 Philips Binding
Head (Bronze)
Washer 3.3mm
Gate Bind Plate
JA03104A
Main Chassis Ass'y
1
JA03109A
0B07092U
BA03779A
0J03469A
BA03777A
0B06085A
0B05874A
BA03778A
0B05873B
Main Chassis Sub Ass'y
Power SW.
Indicator SW. P.C.3, Ass'y
SW. Shade
Output P.C.B. Ass'y
Silicon Diode S15VB-20
Cement Resistor 6.8P- 10W
Relay P.C.B. Ass'y
Electrolytic Capacitor 39,000,uF
63V
1
I
2
1
1
1
1
2
L01
L02
LOS
C01
01
02
03
04
05
06
07
08
09
Description
Schematic
Ref. No.
Q'ty
4
1
Part No.
10
11
0B06554U
0J03508B
L01
0E00533A
L02
0E00007A
L03
L04
0E00219A
0E00606A
L05
L06
L07
0E00037A
0J03512A
0E00667A
LOS
L09
L10
L11
0J03511A
0E00709A
0E00513A
0E00727A
L12
0E00726A
L13
0E00142A
Description
Power Transformer
Earth Angle
Screw M3x5 Philips Countersunk
Screw M2.6x5 Philips
Countersunk
Screw M2.6x5 Philips Pan Head
Screw M3x6 Philips Pan Head
(3A)
Earth Lug 8-5
Capacitor Holder Washer
Screw M4x6 Philips Pan Head
(2A)
Transformer Holder Washer
Washer 5mm Spring
Nut Hex. M5
Screw M4x8 Philips Pan Head
(2A)
Screw M4x1 5 Philips Pan Head
(3A)
Washer 2.6mm
Q'ty
1
1
2
1
2
5
1
4
4
4
4
4
2
1
2
i
17
6.4. Main Chassis Ass'y (C01)
L11
LQ7
9
L06
03
Fig. 6.4
18
6.5.
Front Panel Ass'y (C02)
L01-
01
Fig. 6.5
6.6.
Rear Panel Ass'y (C03)
,13
L04L03
06
L05
01
LÖ2
Fig. 6.6
19
6.7.
Indicator Lamp Ass'y (C04)
6.8.
Power Lamp Ass'y (C05)
L01-
Fig. 6.7
Schematic
Ref. No.
Part No,
C02
HA03658A
Front Panei Ass'y
01
02
03
L01
0H03452B
0H03453C
0J03559B
0E00740A
Front Panel
Indicator Base
Lamp House Holder Spring (B)
Screw M2x8 Cylinder Head
C03
JA03108A
Rear Panel Ass'y
01
02
03
04
05
JA03110A
0B03072A
0J03502A
0B08233U
0H03335A
06
07
08
08
09
10
11
12
0H03334B
0B08231U
0B08230U
0B08232U
0B08037U
0B03900U
0A03154B
0H03366A
13
14
L01
0B08240U
0B03877U
0E00594A
L02
L03
L04
L05
0E00157A
0E00172A
0E00507A
0E00590A
L06
0E00591A
L07
0E00037A
Q'ty
Schematic
Ref. No.
Part No.
1
C04
JA03106A
Indicator Lamp Ass'y
2
1
3
3
12
0J03509A
JA03111A
0J03489A
0J03507C
BA03783A
0E00724A
Filter Stopper
Filter Ass'y
Lamp House
Light-Intercepting Plate
Indicator Lamp P.C.B. Ass'y
Screw M2.6x5 Philips Pan
Head (Tapping)
1
1
01
02
03
04
05
L01
1
1
1
1
2
Rear Panel Sun A^s'v
2P Pin Jack
Push Terminal Holder
Push Terminal
Voltage Seiector Cover SO
1
1
1
C05
JA03105A
Power Lamp Ass'y
1
Acrylic Cover
Fuse Socket
Fuse 3.1 5A (220, 240V)
Fuse 5A (100, 117V)
Cord Bush (C)
Power Cord
Cord Spacer
Washer for/Voltage Seiector
Cover
Spark Killer
Voltage Seiector Socket
Screw M3x8 Philips Pan Head
(Bronze)
Washer 3mm (Black)
Washer 3mm Toothed Lock
Nut Hex. M3
Screw M3x12 Philips Pan Head
(Bronze)
Screw M3x20 Philips Pan Head
(Bronze)
Earth Lug B-5
1
1
1
1
1
1
01
02
03
04
L01
0J03509A
0J03490A
0J03489A
BA03782A
0E00724A
Filter Stopper
Orange Filter
Lamp House
Power Lamp P.C.B. Ass'y
Screw M2.6x5 Philips Pan
Head (Tapping)
1
1
1
1
2
Description
1
1
1
2
1
1
4
6
4
4
2
2
1
20
Description
Q'ty
2
D
8. PERFORMANCE DATA
Output vs Total Harmonie
Distortion
: 1kHz
Load Imp.
Filter:
:
s
i i
| 1
1
1j I 1
—
i
Frequency vs Total Harmonie
Distortion
Output:
100 Watts Constant
Load Imp: 8 ohms
8 ohms
400Hz H.P.
SOkHz L.P.
4
T
2
0 1
0.1
6
b
1
1
|
l . j i |
-
-
—
i
i
Ltl i
0.01
6
!
0.001
t
HJ
4
,
7
J
0.1
,,2
4
4
6
10
2
4 6 100
I
y
2
2
0.001
4 6
4 6 100
2
4
Output Power (Watts
6
1k
2
4 6
!0k
2
4
Frequency (Hz)
Output vs Harmonie Distortion
Frequency: 1kHz
Load Imp: 8 ohms
Output Power vs IM Distortion
60Hz : 7kHz ( 4 : 1 )
!!
4
11
!
I
2
I
0.001
0.1
6
4
I
6
4
.i
- ^ To al
—.
2
,
00001
6
4
2
^
>
0.01
6
4
4; 7th
•—
u
I i
I
2
4 6
l
2
4 6
10
2
\ \
---
Output Power (Watts;
j—
r
]^
The distortion -Jata immediately above was obtained with rhe aid of
a Bruel Pi Kja^r 3348 R^al Time Anaiyzer. These measuniments cannot
b<i rnade with -.onvintional distortion analyzers because of noise
focto.-:.
10
2
4
6
10
2
4
-<
i00
Output Power 'Wal
Fig. 8
22
;|
"Ar
0.001
4 6 100
4
.4-
:: —
2
4
V
9. BLOCK DIAGRAM
+53V
INPUT
OUTPUT
1V/10K
1OOW
AC
8fl
INPUT
•4-6V
-5V
(To Power Peak
Indicator Circuit)
-f6V
GREEN
RED
Fig. 9
23
10.
SCHEMATIC DIAGRAM
I VTTL.I\
ULUV/fN
I
0002 g f
1 POWER BLOCK
a
0003
T}HB fo
'
Note: 1. i
k016
W'
| shows the reference circuit voltage
2.
In the power block circuit, resistor R018,019
and capacitor C013 ( * marks) are the parts
at approx. 30 watts Output.
for adjustment, and so typical value is shown.
24
11. SPECIFICATIONS
Power Source
Power Consumption
Power Output
IHF Power Bandwidth
(both Channels driven)
Damping Factor
Total Harmonie Distortion
Intermodulation Distortion
Frequency Response
!nput Impedance
Residual Noise Level
Signal-to-Noise Ratio
Crosstalk
Peak Power Indicators
Dimensions
Weight
•
,
100/117/220/240 V AC, 50/60 Hz
50 VA at idling
700 VA with both Channels driven to clipping into 8 ohm loads
100 Watts per Channel minimum continuous sine wave ("RMS") at 8 ohms,
5-20,000 Hz with less than 0.01 %THD
50 Watts per Channel at 16 ohms
5 - 50,000 Hz for less than 0.1%THD
5 - 20,000 Hz for less than 0.01%THD
5 - 10,000 Hz for less than 0.005%THD
Greater than 100 (1 KHz, 8 ohms)
Less than 0.002% @ 1 KHz or below
Less than 0.005% @ 10 KHz or below
Less than 0.002% (60 Hz: 7 KHz, 4:1, 8 ohm load, 100 W Output)
5 - 100,000 Hz +0, -1 dB
10 K ohms
Less than 0.05 mV (IHF A Network)
Less than 0.1 mV (linear)
Better than 120 dB at rated Output (IHF A, input shorted)
Better than -70 dB @ 1 KHz
Green at 1 W, 5 W, 25 W, seiectable
Red at 25 W, 50 W, Maximum (110-130 W) selectabie
(Response time: responds to 0.1 ms pulse — off after 0.3 sec)
15.75"(W) x 7.44"(H) x 9.76"(D)
400mm (W) x 189mm (H) x 248mm (D)
27.6 Ibs. (12.5 kg)
Specifications and appearance design are subject to change for further improvement without notice.
26
Service Manual
Nakamichi 620
NAKAMICHI RESEARCH INC.
1-153 Suzukicho, Kodaira, Tokyo
Phone: (0423) 42-1111
Telex: 2832610 (NAKREI J)
Cable: NAKAMICHI KOKUBUNJI
NAKAMICHI RESEARCH (U.S.A.) 3NC.
West Coast Office
1101 Colorado Avenue,
Santa Monica, Caiif. 90401
Phone: (213) 451-5901
Telex: 652429 (NAKREi SNM)
NAKAMICHI RESEARCH (U.S.A.) INC.
New York Office
220 Westbury Avenue,
Carle Place, N.Y. 11514
Phone: (516) 333-5440
Telex: 144513 (NAKRE! CAPL)
Service Information
Model
Seria! N a
Nakamichi 620 (Power Amplifier)
from 4104902
Subject
Addition of Protector Circuit
NAKAMICHI
[\j 0
; I.
D a t e
OOD-M-0044 ( 1 / 5 )
l September, 1977
General:
A. Purpose:
A protector circuit has been added to prevent Speakers from breakage,
as the breakage of transistors in 620 would induce possible breakage
of the Speaker.
Note;
When the protector circuit is activated (speaker terminals
shorted with relay contacts), the power supply for 620 is
required to be once switched off so as to release the protecting function.
The power should again be supplied for at least
5 minutes after switching off,
B. Modification:
Additional Parts:
Part No. BA03865A Protector P.C.B. Ass'y .... 1 pce,
0J03687A E.P. Stud A
,...2 pcs.
0E00030A Washer 3mm
. ,.. 1 pce.
Modified Parts:
Main Chassis Ass T y . ... Part No. has been changed from JA03104A to
JA03104B (including Protector P.C.B, Ass ? y).
Mechanism Ass 7 y ..,,,,, Part No, has been changed from JA03103A to
JA03103B (including Protector P.C.B, Ass'y),
C. Principle of Operation:
The protector circuit aims at protecting the Speaker with a shortcut
from the Speaker terminals to GND by operating the relay in Protector
P.CB. Ass ! y when D.C, voltage is impressed between Speaker terminals
against any possible accident.
The time length required for protector to operate are specified as
below according to D.C. voltages (either plus or minus) impressed
between the Speaker terminals:
D.C. Voltage betx^een
Speaker Terminals
Time required till
Protector operates
50V DC
approx, 0.5 sec or less
20V DC
approx. 1.2 sec ± 30%
OOD-M-0044 (2/5)
D.C. Voltage between
Speaker Terminals
Time required till
Protector operates
10V DC
approx, 2,5 sec ± 30%
5V DC
approx. 4 ^ 10 sec
Once the protector circuit is activated, the protecting State is retained
until the power supply to 620 is disconnected to release it.
The power should be supplied after power capacitors are fully discharged
(for approximately 5 minutes or more).
Note:
The protector circuit in 620 may occasionally be activated if
a high transient D,C. voltage is delivered from the preamplifier
connected with 620 at the time when the power supply for the
preamplifier is turned on.
The cause is not from any trouble in 620,
For its countermeasure? the power for 620 is recommended to be
supplied last of all.
H . Parts List:
Part No, BA03865A
0J03687A
E.P. Stud A
,.,.2 pcs.
0E00030A
Washer 3mm
. .,, 1 pce,
Schematic
Part No.
Ref, No.
O4013402
403
0404
D401?402
D403
ZD401
ZD402
R401,402
R403;;404
407
R405.406
R408'
R409,410
R4U ,414
R412
R413,415
C401.402
C403
RY401
Protector P.C.B. Ass'y .,,,1 pce,
Description
BA03865A
Protector P.C*B. Ass'y
0B07727A
0B06078A
Protector P.C.B,
Transistor 2SC1400
0B06074A
0B01909A
0B06109A
0B06073A
0B06002A
0B01921A
0B05650A
Transistor 2SA750
Silicon Diode 1S1555
Silicon Diode GP08B
Zener Diode
10S
Zener Diode
15R
Carbon Resistor 330K ERD-25V J
Carbon Resistor
12K ERD-25V J
0B01781A
0B05593A
0B01920A
0B05607A
0B01795A
0B01833A
0B05885A
0B01290A
0B07171A
1K ERD-25V J
Carbon Resistor
Carbon Resistor 150K ERD-25V J
Carbon Resistor 10OK ERD-25V J
Carbon Resistor
180 ERD-25V J
Carbon Resistor 4,7K ERD-25V J
Carbon Resistor
10K ERD-25V J
Electrolytic Capacitor 100yF 10V
Ceramic Capacitor 0,01yF 50V
Relay HB-2T
OOD-M-0044 (3/5)
HI. Mounting Diagram and Schematic Diagram:
Refer to Figs. 2 and 3.
~N . Modification Procedures for the Current Models:
Following shox>zs the way hox^ to assemble the Protector P.C.B. Ass T y
in the current Models.
A. Parts to be required:
Part No. BA03865A Protector P.C.B. Ass T y
1 pce.
0J03687A E.P. Stud A
.,.,2 pcs.
0E00030A Washer 3mm
.... 1 pce.
B. Modification Procedures:
Refer to Fig. 1.
1. Disassemble the Cabinet by removing five screws.
. 2, Remove two screws from the Relay P.C.B. Ass 7 y and replace with
E.P. Studs.
Note to add a washer as shown in the figure,
3, Loosen the screw which fixes the cement resistor 6.8fi 10W to the
chassis, then move the cement resistor to prevent contacting the
Protector P.C.B. Ass 7 y.
4, Assemble the Protector P.C.B. Ass'y.
5, Disassemble the Rear Angle by removing two screws,
6, Solder the Signal wires (WHT,WHT) of the Protector P.C.B. Ass T y to
the Speaker terminal (output terminal) plus side of both Channels,
7, Solder the RED wire of the Protector P.C.B, Ass T y to the plus terminal
(RED wires are already soldered) of the capacitor Cl 39?000yF 63V,
8, Solder the BLU wire of the Protector P.C.B» Ass 7 y to the minus terminal (BLU wires are aiready soldered) of the capacitor C2 39,000yF 63V.
9, Bind these wires at an appropriate point,
10, Assembie the Rear Angle,
11, Assemble the Cabinet,
OOD-M-0044
Protector
P.C.B.Assy
Washer 3mm
Cement Resistor
Reiay P.C.B.Assy
Fig. 1
Protector P.C.B. Ass'y Mounting Diagram
(4/5)
Schematic Diagram
J + 53V
LEFT{^7-
lNPUT,-t-,
RIGHTVM
POWER BLOCK
rrr-\\-
'
^ ^ ^
E12
i
r'L3OI
H<:\ -TMDC 100
>n
I
_J
I RELAY 30ARD
iR^ 3
OOD-M-0044 ( 5 / 5 )
' |
RI---IW
R2---5W
R3---25W
R4---25W
R5---50W
R6---MAX
47K//1M
I8K//39OK
6.8K//5-.K
6.8K//56K
3.3K//IOK
2.7K
LAMP P C B.
"1
OUTPUT
TERMINAL
L
=PDI
Q
r
INDICATOR
SW. PC.B.
I
1
LAMP PC.B.
30ARD
u
I
Ri.-.tw
R2--5W
R3 ---2bW
R4---25W
R5---5OW
R6---MAX
H 4 3 2
—GuuuD—
BOARD
Fig. 10
-7K//1M
I8K//39OK
6.8K//56K
6.8K//56K
3.3K//IOK
2.7K
I