NAD C 372 User manual

NAD
SERVICE MANUAL
C 372
STEREO
AMPLIFIER
C 372 STEREO AMPLIFIER
Feb 2006

SPECIFICATIONS
STEREO MODE
CONTINUOUS AVERAGE POWER =150 W (21.8 dBW)
OUTPUT INTO 8 OHMS OR 4 OHMS
(Min. power per channel, 20 Hz –20 kHz, both
channels driven, with no more than rated
distortion)
Rated Distortion =0.03%
(THD 20 Hz –20 kHz)
Clipping power =170 W
(maximum continuous power per channel).
IHF dynamic headroom at 8 ohms =+2.3dB
IHF dynamic power
(Maximum short term power per channel) 8 ohms: =230 W (23.6dBW)
4 ohms: =410 W (26.1dBW)
2 ohms: =520 W (27.2dBW)
Damping factor >150
(ref. 8 ohms 50Hz)
Input Impedance R = 20 kohms
C = 470 pF
Input sensitivity (for rated output into 8 ohms) 1.2V±0.1V
Voltage gain 29 dB
Frequency response 20 Hz –20 kHz ±0.3 dB
-3 dB at 3 Hz/70 kHz
Signal / Noise ratio, A-weighted >100 dB ref. 1 W
>120 dB ref. rated power
BRIDGED （MONOPHONIC）MODE
CONTINUOUS AVERAGE POWER 330 W25.2 dBW）
OUTPUT INTO 8 OHMS
(Min. power per channel, with no more than rated distortion)
IHF dynamic headroom at 8 ohms 3 dB
IHF dynamic power 8 ohms: 800 W (29.0dBW)
IHF dynamic power 4 ohms: 1200 W (30.8dBW)
DIMENSIONS AND WEIGHTS
Net Weight 13.0kg ( 28.7 Ib)
Shipping Weight 14.9kg ( 32.85 Ib)
Dimension (W ×H ×D) 435 ×133×350 mm

ALIGNMENT PROCEDURE (C372)
I. INITIAL ADJUSTMENT (No load connected)
A. OUTPUT OFFSET VOLTAGE
1. Connect a DC Millivoltmeter between TP303 &TP304 (pin 1 of IC 301A & gnd),
then adjust VR303(50kohms) to get a reading as close as 0V as possible, +/-3V.
2. Connect a DC Millivoltmeter between TP403 &TP404 (pin 1 of IC 401A & gnd),
then adjust VR401(50kohms) to get a reading as close as 0V as possible, +/-3V.
B. IDLING CURRENT
1. Connect a DC Millivoltmeter to TP301 and TP302, then adjust VR302 (500ohms)
for 5-6mV reading on meter.
2. Connect a DC Millivoltmeter to TP401 and TP402, then adjust VR402 (500ohms)
for 5-6mV reading on meter.
3. Leave power “ON” for a minimum of 5 minutes.
C. ISC SENSITIVITY
Connect a DC Millivoltmeter to TP701 and TP702, then adjust VR701 (47kohms)
between –50mV to -100mV.
II. FINAL ADJUSTMENT
Repeat procedure A and B for offset voltage and idling current alignment respectively.
VR303 VR302
TP303 TP304 TP302 TP301
VR402 VR401
TP402
TP403 TP404
TP401
LEFT CHANNEL
RIGHT CHANNEL

MAIN BOARD

B649
ECB
2SB649
2SD669
PORT2/0
PORT2/1
PORT2/2
PORT2/3PORT2/4
PORT2/5
PORT2/6
PORT2/7
VCC
XTAL2
XTAL1
PORT3/1
PORT3/2 PORT3/3
PORT0/0
PORT0/1
PORT0/2
GND
1
2
3
4
5
6
7
8
910
11
12
13
14
15
16
17
18
Z86C0812PSC 1
2
3
4
5
6
78
9
10
11
12
13
14
GND
VCC
74LS00
IC902:
QP0 QP1 QP2 QP3 QP4 QP5 QP6 QP7
1
2
3
4567
8
9
10
11121314
15
16
8-STAGE SHIFT REGISTER
8-BIT STORAGE REGISTER
3-STATE OUTPUTS
D
CP
STR
OE
QS1
QS2
VCC
GND
CD4094
2SA872
2SA1015
2SC1815
A970
ECB
K369
DGS
2SK369 SGV
IS1U621L
R103
470 MF
R105
470 MF
C102
100p
C103
100p
R107
470 MF
R109
470 MF
R111
470 MF
C104
100p
C105
100p
C106
100p
R113
470 MF
R115
470 MF
R118
470 MF
C107
100p
C108
100p
C109
100p
R116
1M
R114
1M
R112
1M
R104
1M
R106
1M
R108
1M
R110
1M
6
5
4
RL6B
6
5
4
RL7B
6
5
4
RL8B
6
5
4
RL9B
6
5
4
RL10B
6
5
4
RL11B
6
5
4
RL12B
RCA1C
CD
RCA1E
VIDEO
RCA2A
AUX
RCA2C
TUNER
RCA3A
REC2
RCA3C
TAPE1
RCA3E
REC1
RCA2E
TAPE2
RCA4A
PREOUT1 RCA4B
PREOUT 1
RCA4E
PREOUT 2
RCA4F
PREOUT 2
R203
470 MF
R205
470 MF
C202
100p
C203
100p
R207
470 MF
R209
470 MF
R211
470 MF
C204
100p
C205
100p
C206
100p
R213
470 MF
R215
470 MF
R217
470 MF
C207
100p
C208
100P
C209
100P
R216
1M
R214
1M
R212
1M
R204
1M
R206
1M
R208
1M
R210
1M
3
2
1
RL6A
3
2
1
RL7A
3
2
1
RL8A
3
2
1
RL9A
3
2
1
RL10A
3
2
1
RL11A
3
2
1
RL12A
RCA1D
CD
RCA1F
VIDEO
RCA2B
AUX
RCA2D
TUNER
RCA3B
REC2
RCA3D
TAPE1
RCA3F
REC1
RCA2F
TAPE2
R119
220 MF
1 2 3 4 5 6 7 8 9 10
M102
C372 PREAMP MODULE
+V34
R120
100
C211
8.2P
R219
220 MF
-V34
1
2
3
4
5
6
7
8
CB501
8PIN
L buff out
R buff out
GND
+34V
-34V
Lout
GND
Rout
+V34 -V34
C212
22N
PE
C213
220u
C214
220P
R223
75/FS 0.5W
R222
22K
6
5
4
RL2B
A2
RV5B
1K
C215
220P
RCA4D
MAIN LIN
RCA4C
MAIN RIN
1 2 3 4 5
CB301
5PIN
1 2 3 4 5 6
CB401
6PIN
R753
100
C786
10n/63V
TO LEFT POWER AMP TO RIGHT POWER AMP
RCA1B
DISC
RCA1A
DISC R101
470 MF
C101
100p
R102
1M
6
5
4
RL5B
R201
470 MF
C201
100p
R202
1M
3
2
1
RL5A
C111
22N
PE
C112
220u
C113
220P
R124
75/FS 0.5W
R123
22K
3
2
1
RL2A
B1
A1
RV5A
1K
C114
220P
R117
1M
R218
1M
4 5 6
SW2B
SOFT
V34R
CLLED
BRIDGELED
8
RL5C
12V
8
RL6C
12V
8
RL7C
12V
8
RL8C
12V
8
RL9C
12V
8
RL10C
12V
8
RL11C
12V
8
RL12C
12V
D730
1N4148
D731
1N4148
D732
1N4148
D733
1N4148
D734
1N4148
D735
1N4148
D736
1N4148
V5
IR IN
IR out
+12V
TAPE1
TAPE2
TUNER
AUX
VIDEO
CD
DISC
A SPEAKER ON
IRMUTE
B SPEAKER ON
MAIN ON
7 8 9
SW3C
BRIGDE
1
2
3
4
5
6
7
8
9
10
CB906
10PIN
1
2
3
4
5
6
7
8
9
10
CB907
10PIN
+12V
R126
100K
R226
100K
V34R
PR
IRMUTE
+5V
+12V
R127
200
R227
200
C501
220u/25
R506
3K32 MF 1%
R507
750 MF 1%
R504
390 MF 1%
R505
180 1%
B1
A1
RV1A
10KA
B1
A1
RV2A
10KA
C507
22n 2%
C508
0.1u 2%
R501
1K5 MF 1%
R502
390 MF 1%
C503
0.22u 5%
C504
0.97u 5%
C509
470P
RV4A
20K MN
C601
220u/25
R606
3K32 MF 1%
R607
750 MF 1%
R604
390 MF 1%
R605
180 1%
A2
RV1B
10KA
A2
RV2B
10KA
C607
22n 2%
C608
0.1u 2%
R601
1K5 MF 1%
R602
390 MF 1%
C603
0.22u 5%
C604
0.97u 5%
C609
470P
RV4B
20K MN
R503
5K1
R603
5K1
ON
OFF
OFF
ON
BALANCE POT
BALANCE POT
BASS POT
BASS POT
TREBLE POT TREBLE POT
RV3A
20KA
RV3B
20KA
1
2
3
4
5
6
7
8
CZ501
8PIN
VOL-UP
TONE RIN
TONE ROUT
TONE LOUT
1 2 3 4 5 6 7 8 9 10
M501
C372 PREAMP MODULE
R509
100
C511
44P
-34V
R511
590 1% MF
R609
590 1% MF
MD1C R523
2K2
R521
2K2
R525
2K2
R520
2K2
R524
2K2
R522
2K2
C520
4u7
C521
4u7
Q502
C1815
Q501
A1015
Q504
C1815
Q503
A1015
MOTOR
M
VOLUME CONTROL
5V
1 2 3 4
CB502
4PIN
VOL-DN
TONE-LIN
C602
10n
C502
10n
+34V
-34V
+34V
+34V
TONE&VOL BAL
4
5
6
SW4B
DEFEAT
1
2
3
SW4A
DEFEAT
C522
0.1u
-34V
R513
10M
R514
1.6 MF
R614
1.6 MF
R515
10K
R615
10K
Q804
2SK209
R810
18K
R801
1K
R808 10
R804
10
R802
1K
R805
1M
R806 430
R809
1K
R803
1K5
R807
560
Q806 2SA1225
Q801
2SA1312 Q802
2SC3324
Q805 2SC3324
Q803
2SC2983
C802
1N
C801
47pF
Q809
2SK209
R818
18K
R811
1K
R820 10
R819
10
R812
1K
R814
1M
R815 430
R817
1K
R13
1K5
R816
560
Q812 2SA1225
Q807
2SA1312
Q808
2SC3324
Q810 2SC3324
Q811
2SC2983
C804
1N
C803
47pF
1 2 3 4 5 6 7 8 9
10
P801
10PIN
VEEVCC
VCC
VEE
VCC
VEE
R821
220
C805
22p C808
22p
R822
220
C806
0.1uF
C807
0.1uF
C809
0.1uF
C10
0.1uF
1 2 3
SW3A
4 5 6
SW3B
R11
10K
+12V
R12
22K
R13
10K
-V34
PR
SP B
SP A
MAIN ON
BG_OBG_I
BG_S
BG_O
BG_I
BG_S
JIRA
IR IN
JIRB
IR OUT
STR 1
D2
CLK 3
OE 15
Q1
4
Q2
5
Q3
6
Q4
7
Q5
14
Q6
13
Q7
12
Q8
11
QS
9
QS
10
VCC 16
GND
8
IC905
4094
STR 1
D2
CLK 3
OE 15
Q1
4
Q2
5
Q3
6
Q4
7
Q5
14
Q6
13
Q7
12
Q8
11
QS
9
QS
10
VCC 16
GND
8
IC904
4094
C902
20P
C903
20P X901
12MHz
C901
0.1u
C915
0.1u
+5V
C VI TU AU T2 T1 DI
LD902
CD
LD904
AUX
LD901
DISC
LD905
TUNER
LD903
VIDEO
LD907
TAPE1
LD906
TAPE2
R924
4K7
R903
1K
R923
2K2
Q913
A1015
P24 1
P25 2
P26 3
P27 4
VCC 5
X2 6
X1 7
P31 8
P32 9 P33
10 P00
11 P01
12 P02
13 GND
14 P20
15 P21
16 P22
17 P23
18
IC902
Z86C0812PSC
Q901
C1815
Q902
C1815
Q903
C1815
Q904
C1815
Q905
C1815
Q906
C1815
Q907
C1815
R922
4K7
R920
4K7
R918
4K7
R916
4K7
R914
4K7
R912
4K7
R910
4K7
C906
10n C907 10n C908 10n C909 10n C910 10n C911 10n C912 10n
CVI TUAU T2 T1DI
CD VIDEO TUNERAUX TAPE2 TAPE1DISC
CD VIDEO TUNER AUX TAPE2 TAPE1 DISC
R909
4K7
R911
4K7
R913
4K7
R915
4K7
R917
4K7
R919
4K7
R921
4K7
R939
10K
R906
10K
R940
10K
GREENGREENGREEN
GREEN
GREEN GREEN GREEN
R935
100
R936
100
R937
10K
8
1
2
3
4
5
6
7
12
11
10
9
13
14
IC901
74LS00
+5V
+5V
+5V+5V
R925
10K
+5V
V34R
+12V
K907VIDEO
K906 AUX
K904 TAPE2
K905 CD
K903 TAPE1 K901 DISC
K902 TUNER
V S G
IC903
IS1U621L
C904
10u
+5V
K908
B
R930
6K8 R933
2K2
R928
0
Q910
C1815
LD911
BRIDGE
LD912
SOFT
LD909
B
A
A SPEAKER ON
A SPEAKER ON
MUTE blink
V34R
A SPEAKER ON
TAPE1
TAPE2
TUNER
AUX
VIDEO
CD
DISC
+5V
REMOTE
REMOTE
CONTROLLER
KEYBOARD
B SPEAKER ON
IRMUTE
B SPEAKER ON
B
LD908
A
B SPEAKER ON
Q908
C1815
R908
4K7
C913
10n
R907
4K7
Q909
C1815
R904
4K7
C914
10n
A
R905
4K7
BRLED
CLLED
IRMUTE
B
BRLED
CLLED
PR
PR
K909
A
15
9
3
BLINK
+5V
R927
330
R934
820
Q912
C1815
D909
1N4148
D912
1N4148
LED910
LED2
GRN
RED
GRN
IR OUT IR IN
+5V
IR OUT
IR IN
+12V
D907
6V8
+12V
R929
22K
LED BOARD
P ON/OFF
D908
1N4148
D906
1N4148
D910
1N4148
D911
1N4148
P12V
TO PHONE BOARD CZ706
1
2
3
4
5
6
7
8
9
10
CZ906
10PIN
1
2
3
4
5
6
7
8
9
10
CZ907
10PIN
1 2 3 4
CZ502
4PIN
V34R
Q914
C1815
R941
10K
R943
4K7
P ON/OFF
R944
2K2
R945
2K2
Q916
C1815
R901
200
R900
1K
+5V
R902
1K
Q915
A1015
+5V +5V
NC 1
NC 2
NC 3
Vss 4 SDA
5SCL
6NC
7Vcc
8
IC906
24C00
R931
10K
+5V
C905
47uF/25V
R938
330
R926
22
R798
330
R610
15K
R510
15K
R121
562
R221
562
/2SD1815 /2SD1815
/2SB1215 /2SB1215
C372 PREAMP MODULE
C372 PREAMP MODULE

C25
2N2
C26
2N2
CHASSIS
CHASSIS
TO STAR GND
TO STAR GND
RLO2A
RLO4A
R VSP
SP0R
SP0L
L VSP
POWER AMP
FROM RIGHT
TO SPEAKERS
L OFFSET
L PHONES
R PHONES
R OFFSET
LA LB
LA- LB-
RA- RB-
RA RB
CB1
SPK-OUT
RLO3A
RLO1A
POWER AMP
FROM LEFT
2SA1943
BCE
2SC5200
2SA872
2SA1015
2SC1815
A872
ECB
B649
TL431
LM317
123
LM317
RAK
ECB
TL431
2SB649
2SD669
1:ADJUST,2:OUT,3:IN
LM337
LM337 1:ADJUST,2:IN,3:OUT
123
LM7805
LM7805 1:IN
2:GND,3:OUT
C717
22n/250V
C718
22n/250V
C724
C727
Q704
2SC1815
Q703
2SA1015
D702
BT151-500R
D703
BT151-500R
R703
1K
R715
22K
R706
100
R708
1K
R704
1K
R705
1K
R707
100
R709
22K
R710
0.025/3W 2%
R711
100 1%
Q705
2SA1015
Q706
2SA1015
R713
470K
FP H1
H2
L1
L2
G
52.1V AC
35.1V AC
C730
22n/250V
C731
22n/250V
40V AC
R733
240/1% MF
R735
240/1% MF
R732
6K2/1% MF
R734
6K2/1% MF
C754
22u/50V
C755
22u/50V
C756
22N
C757
22N
IN
IC703
LM317M
IN
IC704
LM337M
C750
22N
C751
22N
+V34
-V34
C748
2m2/50V
C749
2m2/50V
C752
10u/50V
C753
10u/50V
D709
1N4148
D710
1N4148
C720
22n/100V
C721
22n/100V
R746
1/1W FS
R747 1/1W FS
R748 1/1W FS
R749
1/1W FS
C732
22n/100V
C733
22n/100V
C734
1000u/100V
C735
1000u/100V
R716
1K
R717
1K
R722
33 FS
R719
1K
R718
1K
R720
1K
R724
1K
R721
1K
R730
10K
R726
1K
R725
3K3
R728
10K
R723
33 FS
R727
1K
R729
22K
C738
100u/16V
C742
10u/100V
C743
4u7/100V
C739
100u/16V
C747
22u/80V
C744
22n
C741
47P
C740
47P
C745
22n
Q709
2SD669A/KSC2690
Q710
2SC1775A
Q711
2SC1775A
Q712
2SB649A/KSA1220
Q713
2SA872
D705
1N4148
D706
1N4148
D708
1N4148
D707
1N4148
C736
47u100V
C737
47u/100V
R731
22K
C746
22u/80V +V34
+V68
-V68
61.5V AC
Q714
2SC1775A
Q715
2SD669A/KSC2690
R736
6K2
R737
3K9
R738
270/2W FP
+V34
V34R
+12V
AC S1
AC S2
+
+
-
-
B705
DB104
AC S1
AC S2
+
+
-
-
B706
DB104
AC S1
AC S2
+
+
-
-
B703
KBU1004
AC S1
AC S2
+
+
-
-
B704
KBU1004
AC S1
AC S2
+
+
-
-
B701
DB101 C706
22N
C707
2m2/16V
C708
100N
C710
100N
C709
10u/16V IN
IC701
7805
D701
1N4148
V5
C722
22n/100V
C723
22n/100V
D704
1N5401
1
2
3
4
5
6
7
8
9
CB402
9PIN
1
2
3
4
5
6
7
8
9
CB302
9PIN
10A10A
1A
Q707
2SA1015
Q708
2SC1815
R714
22K
R768
36K 1%
R740
1K 1%
R742
1K
R789
36K 1%
C703
10uF/50V
C704
10uF/50V
1
2
3
SW2A
R744
1K
R741
1K 1%
D732
24V/0.5W
D731
24V/0.5W
SC-N
OVER CURRENT
+68V
-68V
POS 90
POS 80
+V68-V68
-68V
+68V
OVER CURRENT
SC-P
FROM VI OVER LOAD DET IN POWER AMP
D724
1N4148
D722
1N4148
R781
22K
Q723
2SA1015
+12V
RLO1B 36V
Q727
2SC1815
R788
5K6
+V34
clip
1
2
3
CB705
8
RL2C
12V
L PHONES
R PHONES
C759
10n
CHASSIS
R745
2.2
+20/-10%
C728
10000u/80V x 6
C725
0L
0R
SP0L
SP0R
STAR
GROUND
POINT
-V64
TO LEFT
POWER AMP
I/V
I/V OVER LOAD DET
FROM POS 80
FROM POS 90
(TRIG)
+V64
-V64
SOFT CLIP
1
2
3
4
5
CB704
5PIN
1
2
CB702
2PIN
1
2
3
4
5
CB703
5PIN
D725
1N4148
RLO3B 36V
Q725
2SA1015
Q726
2SA1015
D723
1N4148
D726
1N4148
R786
10K
R785
10K
SP A
SP B
L OFFSET
R OFFSET
ISC
ISC C
IRMUTE
Q722
2SC1815
R791
10K
R792
100
R793
100
C705
0.1uF
SC-P
SC-N
R21
3R3/1W FP
L2
1uH
C24
22N
R20
3R3/1W FP
L1
1uH
C23
22N
R VSP
Q729
2SC1815
D727
1N4148
R794
220K
+V34
-V34
MUTE-L
MUTE-R
PR
TO CB304&CB404
C21
22N
C22
22N
PR
RLO2B 36V
RLO4B 36V
R795
100K
R712
9K1 1%
R796
470K
D716
1N4148
R757
100K
R756
100K
R758
62K 1%
R767
390K 1%
6
7
8
4
IC705A
TL082BD
R764
20K
R765
12K
R769
20K
R770
12K
R766
10
R771
10
Q720
2SC1815
Q721
2SA1015
+V34
C764
10u/50V
C769
10u/25V
-V34
V12
C767
1uF/50V
R755
220K
IC705B
TL082BD
R752
200K
R743
470K
C761
1uF/50V
C762
1uF/50V
R759
10K
D715
1N4148
R751
27K 1%
R760
220K
1
2
3
-V12
5
R761
220K
Q730
2SC1815
R799
22
-V12
BG_D
ISC
R VSP
ISC C
1
VR701
50K
C719
1N
1
2
3
4
CB404
1
2
3
4
CB304 -V64
+V64
+V64
R797
470K
TP9
TP10
R754
10K
D714
6.8V
C760
1uF/50V
D711
BAV21
D713
BAV21
R VSP
D720
4.7V
D719
4.7V
D717
BAV21
D718
BAV21
C766
C765
V34R
Q701
2SD669A/KSC2690
R739
10
PJ701
+12VOUT
R701
1K
C714
100N
R702
68
Q702
2SC1815
Q700
2SC1815
D700
14V
R700
270
R774
56K
R773
56K
C781
330u/16V
C783
4u7/50
C782
0.22u
R782
10K
R780
10K
R777
56K C784
47u/50
1
234
5
6
7
8IC706
uPC1237HA
+V34R
R775
22K
R776
22K
D720
1N4148
D728
1N4148
D729
10V
Q724
2SA1015
C785
10u/50
R783
820
R784
10K
R787
10K
R778
10K
R779
220/3W FP
R790
5K1
!
RED
GRY
BLK
ORG
VIO
!
!
P1A
T2:
TI-67790B: AC 230V/50Hz
TI-67791B: AC120V /60Hz
t0
AUTORESET
230V/50Hz
120V/60Hz
0V
P1B
CHASSIS
1
2
3
4
5
CZ704
5PIN
1
2
CZ702
2PIN
1
2
3
4
5
CZ703
5PIN
MAIN
STANDBY
P2B
P2A
T2
!
t0
YEL
YEL
BLU
BLU
WHI
1
2
3
CZ711
D712
1N4148
F701
T3.15AL/250V CE
RL701
250V/10A
C702
4n7/400V
+5V
P ON/OFF
STANDBY&
!
!
C701
4n7/400V
SW1
!
1
2
3
CB711
1 2 3
CZ707
1 2
CB709
1 2
CZ709
1 2 3
CB707
1 2
CB710
1
2
3
CZ710
!
!
!
PHONE BOARD
N13C372D06
N13C372D11
N13C372D12
AC IN/OUTLET
BOARD
PSW BOARD
1 2
CZ706
AH
1
2
3
CZ712
1 2
CZ713
T6.3AL/250V AH
PHONE BOARD
R762
220/2W FP
JK701
1
2
3
CZ705
PHONE SOCKET
PHONE BOARD
R763
220/2W FP
STANDBY&PHONE BOARD
N13C372D06
R374
100
Q329
A872
Q330
C1775
R373
100
C307
22P
C302
680P
C305
22P
C315
0.1uF
R302
22K
R303
100
R312
100
R304
100
R313
27K
R305
27K
R314
100
R306
100
Q313
NOTE
Q310
NOTE
Q309
2SA1015
Q305
2SA1015
Q307
2SA872
Q306
2SA872
Q301
2SA872
Q311
NOT
Q312
2SC1815
Q308
2SC1815
Q304
2SC1775
Q303
2SC1775
Q302
2SC1775
R308
33
R320
33
R318
47K MF
R359
10/1W FS
R315
1K
R323
82 FP 1/2W
R321
39K
R317
150/1/4W 1%
R319
9K1 1/2W 1%
R327
39K
R307
82
R316
10K
R328
100
R311
1K
R310
10K
R326
100K
R324
100K
R309
82 FP 1/2W
D303
1N4148
D304
1N4148
D306
1N4148
D305
1N4148
C308
N.I.
Q314
NOTE
R330
3R3/0.5W FP
R332
330/0.5W FP
R334
4K7/3W FP
R338
3R3/0.5W FP
R341
330/0.5W FP
R344
4K7/3W FP
R337
100/1W FS
R329
100/1W FS
R331
4R7/FS
R339
4R7/FS
R336
33
R340
33
L301
10uH
L302
10uH
R345
1K2
R346
1K Q315
KSC2690
Q317
NOTE
Q324
2SC5200
Q322
2SC5200
Q318
NOTE
R357
0.05/5W
R356
0.05/5W
R348
75 1W FP
R349
75 1W FP
R342
10K
R333
10K
C313
470P
C314
470P
Q327
2SA1943
Q321
2SA1943
D308
BAV21
D307
BAV21
C318
0.1uF
+V64
-V64
+V64
-V64
+V68
-V68
0VRA
R301
470
0VRA
0VRA
0VRA
0VRA
0VRB
0VRB
C301
10uF/50V
C303
10uF/50V
C304
10uF/50V
C306
2200u/6.3V
C311
100UF
C312
100u/25V
R335
10K
R343
10K C316
0.1uF
C317
0.1uF
C309
0.1uF
C310
0.1uF 0VRA
0VRA
Q326
2SA1015
Q325
2SC1815
R364
6K8
C321
10u/50V
R363
22K
R361
1K
R362
15K
C320
22N
D309
1N4148
R365
22K
Q323
2SA1943
Q328
2SC5200
0VRB
LEFT POWER AMP
R322 10K 1/2W 1%
L i/p
GND
R367
T0=80 degree C
0VRB
-V68
+V68
1
2
3
4
5
6
7
8
9
CZ302
V/I OVER
0VRB
+V64
0VRB
-V64
VOP L
D302
18V
D301
18V
3IC2
TL431
3IC1
TL431
1
VR302
500
R347
220
Q316 2SA1015
1
2
3
4
5
CZ304
VOP L
R358
100 1W FP
R375
2K2
1
2
3
CZ301
3PIN
C324
0.1uF
TO CB302
TO CB301
TP1
TP3
TP2
TP4
0VRB
C322
10uF/50V
C323
10uF/50V
0VRB
0VRB
N13C372D02
ADJ DC
ADJ Bias DC
R376
220K
R377
82
R378
39K
R380
2.2
R382
2.2
R384
2.2
R386
2.2
Q319
2SA1943
R381
2.2
R383
2.2
R385
2.2
R387
2.2
Q320
2SC5200
0VRA
L SCP L SCN L MU
L SCP
L SCN
L MU
R351
22
C326
10uF/50V
VR301
50K
C325
10uF/50V
R379
180K
NB
NB
Q337
NOTE
Q338
NOTE
R391
1
R388
1
R389
1
R390
1
C319
0.1uF
0VRA
VOP L
1
2
CB706
2PIN
MAIN ON
+5
SPEAKER
R474
100
Q429
A872
Q430
C1775
R473
100
C407
22P
C402
680P
C405
22P
C425
470pF
R402
22K
R403
100
R412
100
R404
100
R413
27K
R405
27K
R414
100
R406
100
Q413
NOTE
Q410
NOTE
Q409
2SA1015
Q405
2SA1015
Q407
2SA872
Q406
2SA872
Q401
2SA872
Q411
NOTE
Q412
2SC1815
Q408
2SC1815
Q404
2SC1775
Q403
2SC1775
Q402
2SC1775
R408
33
R420
33
R418
47K MF
R459
10/1W FS
R415
1K
R423
82 FP 1/2W
R421
39K
R417
150/1/4W 1%
R419 9K1 1/2W 1%
R427
39K
R407
82
R416
10K
R428
100
R411
1K
R410
10K
R426
100K
R424
100K
R409
82 FP 1/2W
D403
1N4148
D404
1N4148
D406
1N4148
D405
1N4148
Q414
NOTE
R430
3R3/0.5W FP
R432
330/0.5W FP
R434
4K7/3W FP
R438
3R3/0.5W FP
R441
330/0.5W FP
R444
4K7/3W FP
R437
100/1W FS
R429
100/1W FS
R431
4R7/FS
R439
4R7/FS
R436
33
R440
33
L401
10uH
L402
10uH
R445
1K2
R446
1K
Q415
KSC2690
Q417
NOTE
Q424
2SC5200
Q422
2SC5200
Q418
NOTE
R457
0.05/5W
R456
0.05/5W
R448
75 1/2W FP
R449
75 1/2W FP
R442
10K
R433
10K
Q421
2SA1943
Q423
2SA1943
D408
BAV21
D407
BAV21
C418
0.1uF
+V64
-V64
+V64
-V64
+V68
-V68
0VRA
R401
470
0VRA
0VRA
0VRA
0VRA
0VRA
0VRB
0VRB
C401
10uF/50V
C403
10uF/50V
C404
10uF/50V
C406
2200u/6.3V
C411
100UF
C412
100u/25V
R435
10K
R443
10K C416
0.1uF
C417
0.1uF
C409
0.1uF
C410
0.1u/80V
0VRA
0VRA
Q426
2SA1015
Q425
C1815
R464
6K8
C421
10u/50V
R463
22K
R461
1K
R462
15K
C420
22N
D409
1N4148
R465
22K
Q427
2SA1943
Q428
2SC5200
0VRB
RIGHT POWER AMP
R422
10K 1/2W 1%
R i/p
GND
VR401
50K
R466
90C THERMAL BREAKER
R467 T0=80C POSISTOR
0VRB
-V68
+V68
1
2
3
4
5
6
7
8
9
CZ402
0VRB
+V64
0VRB
-V64
VOP R
D402
18V
D401
18V
4IC2
TL431
4IC1
TL431
1
VR402
500
R447
220
Q416
2SA1015
0VRA
1
2
3
4
5
CZ404
VOP R
1
2
3
4
CZ401
R475
2K2
R471 8K2 1/2W 1% R472 8K2 1/2W 1%
Q431
C2878
C424
0.1uF
TO CB402
C422
10uF/50V
C423
10uF/50V
0VRB
0VRB
TP7
TP5
TP6
TP8
0VRB
N13C372D03
ADJ DC
ADJ Bias DC
R476
220K
R477
82
C415
10uF/50V
R425
39K
R480
2.2
R482
2.2
R484
2.2
R486
2.2
Q419
2SA1943
Q420
2SC5200
R481
2.2
R483
2.2
R485
2.2
R487
2.2
C426
470pF
R451
22
0VRB
NB R
NB R
BG R SCP R SCN R MU
R MU
BG
R SCP
R SCN
R450
180K
C419
10uF/50V Q437
NOTE
R488
1
R489
1
Q438
NOTE
R491
1
R490
1
C428
0.1uF
C413
0.1UF
AC IN
AC INLET
2 3
1
84
IC301A
TL082D
C327
1uF
R392
1M
R393
24K
0VRA
VOP L
-18V
-18V
2 3
1
84
IC401A
TL082D
C427
1uF
R452
1M
R453
24K
0VRA
-18V
VOP R
R750
3K3
R772
2K2
D740
1N4148
R396
4K7/3W FP
R395
4K7/3W FP
R495
4K7/3W FP
R496
4K7/3W FP
+64V-64V
1
2
3
4
5
1
2
3
4
1
2
3
4
51
2
3
4
R?
STANDBY TRANSFORMER
R336
90C THERMAL BREAKER
BCE
2SA1837
2SC4793
123
BT151
1: CATHODE
2: ANODE
3: GATE
NO T E :
Q3 10 Q 31 1 Q 313 Q 31 4 Q 317 Q 3 18 Q 337 Q 3 38
Q41 0 Q 411 Q 4 13 Q 414 Q 4 17 Q 41 8 Q4 37
Q4 38 A R E D IF F E R E NT F OR E AC H VE R S IO N O F
C 372, P LE AS E W AT C H T HE V E R S ION NUM BE R
ON TH E AMP P C B T O M AK E S UR E T H AT :
IF IT IS V 4, PL E A S E R E P L A C E T HE A B O V E
T R A NS IS T O R S W I T H 2S B 649 A/2S D669 A.
I F I T IS L AT E R TH AN V 4. 1, P L E AS E R E P LAC E
IT WIT H 2 S A183 7/2S C 4793 .
T HE TR A C E F O R E AC H V ER S I ON A R E
DIF F E R E NT , D O NOT MIX TH E M!

S004
S003
C005
C004
C003
S004
S003
S002 C001
S002
S001
S002
S006 S006 S007 S006
S006
S008
S009
S008
F002
S009
F004
F005 F006
F001 F003 S009
F012
F010 F011
F009
F008
F007
S010
T001
R001
R002
R003
S009
F008
F016
F015
F014
F013 S013
S014
F019
F017
F018
F021
F020 F022
S015
C012
S017
C015
C014
S016
C009
C008
C007
C006
C002
C011
C010
C024
S012
C017
C018
C019
C020
S011
C021
C022
C023
C016
C013
M001
M005
M002
M003
M004
S005
S006
S005
EXPLODED VIEW

EXPLODED VIEW PARTS LIST
REF. NO PART NO. DESCRIPTION Qty. REF. NO PART NO. DESCRIPTION Qty.
C001 67-005010-0 Transformer Shielding Box 1 F007 76-001001-0 IR Lens 1
C002 01-37205-10 Assemblied Pre Amp Module 2 F008 76-003001-0 LED Lens 12
C003 18-37371-22 Transformer C Version 1 F009 77-002002-1 Tone Defeat Button 1
18-37371-12 Transformer AH Version 1 F010 73-014001-1 Tone Knob 3
C004 66-005007-0 Metal Disc 1 F011 77-001001-1 Tone Control Lozenge 1
C005 94-005004-1 Transformer Disc Label 1 F012 73-014002-1 Volume Knob 1
C006 66-018001-1 Chassis 1 F013 74-001002-1 Input Button (3P) 3
C007 66-005004-0 Base Cover 1 F014 75-005001-0 Sleeve(1P) 4
C008 75-010004-1 Foot 4 F015 01-37204-00 Assembled Key Board 1
C009 78-001002-0 Foot Pad 4 F016 66-018003-0 Headphone Bracket 1
C010 69-005006-0 BDP Pin Big 4 F017 66-005005-0 IR Bracket 1
C011 69-002004-0 BDP Pin Small 4 F018 75-003003-0 Bracket 2
C012 70-004003-1 Heat Sink Small B 2 F019 75-003002-0 Sleeve(1P) 1
C013 01-37203-00 Assembled Tone PCB 1 F020 77-018001-0 Knob Volume lozenge 1
C014 70-018001-0 Main Heatsink 2 F021 75-003001-0 Sleeve(7P) 1
C015 85-005001-0 PCB Spacer 10 F022 66-018002-0 Subfascia 1
C016 01-37202-02 Assembled R Channel AMP PCB 1
C017 66-018005-0 Tem. SW Clamper 2 R001 67-018006-0 Rear Panel(C) 1
C018 78-005005-0 Insulated Cashion 16 67-018005-0 Rear Panel(AH) 1
C019 01-37206-00 Assembled Relay PCB 1 R002 18-37060-01 Standby Transformer 1
C020 66-005009-0 Transistor Clamping 16 R003 01-37208-01 Assembled AC Inlet PCB (C Version) 1
C021 70-018003-1 Heatsink C 4 01-37208-02 Assembled AC Inlet PCB (AH Version) 1
C022 78-005002-0 Insluation Cushion(Small) 9
C023 01-37201-00 Assembled Main PCB 1 S001 64-110070-0 Bolt, GB5781, M10X70 1
C024 01-37202-01 Assembled L Channel AMP PCB 1 S002 63-011020-2 Washers, GB97-87φ10 3
S003 63-021030-0 Spring Washers, GB93φ10 2
M001 70-018004-0 Module Lid 2 S004 62-011002-0 Nuts, GB6170, M10 2
M002 78-018001-0 Insulated Cashion 4 S005 61-062108-0 Self Taping Screws, STF2X8-0 4
M003 66-018004-0 Trans Clamp (Module) 4 S006 61-023208-0 Self Taping Screws, BTB3X8 32
M004 01-37205-00 Assembled Pre Amp Module PCB 2 S007 61-024108-0 Self Taping Screws, STB3X8 11
M005 70-018002-0 Module heatsink box 2 S008 61-084108-0 Self Taping Screws, STPW4X8 6
S009 61-023106-0 Self Taping Screws, STB3X6 44
T001 67-018004-0 Top Cover 1 S010 61-022204-6 Self Taping Screws, BTB2.6X4 1
S011 61-023212-0 Self Taping Screws, BTB3X12 2
F001 67-018003-0 Fascia 1 S012 61-223514-0 Hex Screws, GB70, 3X14 16
F002 67-018001-0 End Cap L 1 S013 61-022205-6 Self Taping Screws, BTB2.6X5 2
F003 67-018002-0 End Cap R 1 S014 61-022206-6 Self Taping Screws, BTB2.6X6 14
F004 77-002002-1 Power Button 1 S015 61-083515-0 Machine Screws, MPW3X15 2
F005 77-001007-1 Power Button Bezel 1 S016 61-033420-0 Self Taping Screws, PTP3X20 10
F006 77-005001-1 Input Button Lozenge 1 S017 61-022206-8 Self Taping Screws, BTB2.6X8 18

ELECTRICAL PARTS LIST
REF. NO. PART NO.
16-37202-01 L Channel Raw PCB
01-37202-01 Assembled L Channel PCB
DIODES
D303, D304, D305, D306,
D309 33-44148-02 1N4148 Switch Diode
D302 33-11800-00 18V 1/2W Zener Diode
D301 33-11800-01 18V 1/2W Zener Diode
D307, D308 33-40021-01 BAV21 Switch Diode
TRANSISTORS
Q329, Q301, Q306, Q307 31-00872-00 2SA872A E Transistor
Q305, Q309, Q316, Q326 31-01015-00 2SA1015GR Transistor
Q302, Q303, Q304, Q330 31-01775-00 2SC1775A E Transistor
Q308, Q312, Q325 31-01815-00 2SC1815GR Transistor
Q310, Q313, Q318, Q338 31-00649-00 2SB649A C Transistor
Q311, Q314, Q317, Q337 31-00669-00 2SD669A C Transistor
Q315 31-02690-00 KSC2690A Y Transistor
Q319, Q321, Q323, Q327 31-01943-00 2SA1943 O Transistor
Q320, Q322, Q324, Q328 31-05200-00 2SC5200 O Transistor
ICS
3IC1, 3IC2 03-00431-00 TL431/KA431 IC, Regulator
IC301 03-00082-00 TL082D IC, OP-AMP
CAPACITORS
C305, C307 05-22052-00 22pF 500V ±20% Cermatic Disk Capacitor
C302 05-68152-00 680pF 500V ±20% Cermatic Disk Capacitor
C313, C314 05-47152-00 470pF 500V ±20% Cermatic Disk Capacitor
C320 05-22312-00 22nF 100V +50%-20% Cermatic Disk Capacitor
C315, C319, C324 25-10451-03 0.1uF 50V ±10% Metallized Polyester Film Capacitor
C318 25-10461-01 0.1uF, CL21 63V ±10% Metallized Polyester Film Capacitor
C309, C310, C316, C317 25-10412-02 0.1uF, CL23B 100V ±10% Metallized Polyester Film Capacitor
C327 25-10561-00 1uF, CL233X 63V ±5% Metallized Polyester Film Capacitor
C301, C303, C304, C321,
C325, C326 06-10051-00 10uF, CD110 50V ±20% Alu Electrolytic Capacitor
C322, C323 06-10012-00 10uF, CD110 100V ±20% Alu Electrolytic Capacitor
C311, C312 06-10121-02 100uF, CD263 25V ±20% Alu Electrolytic Capacitor
C306 06-22260-00 2200uF, CD110 6.3V ±20% Alu Electrolytic Capacitor
RESISTORS
R388, R389, R390, R391 07-10109-10 1¡1/4W ±5% Carbon Film Resistor
R380, R381, R382, R383,
R384, R385, R386, R387 07-10229-12 2R2¡1/4W ±5% Carbon Film Resistor
R308, R320, R336, R340 07-10330-10 33¡1/4W ±5% Carbon Film Resistor
R377, R307 07-10820-10 82¡1/4W ±5% Carbon Film Resistor
R303, R304, R306, R312,
R314, R328, R373, R374 07-10101-10 100¡1/4W ±5% Carbon Film Resistor
R347 07-10221-10 220¡1/4W ±5% Carbon Film Resistor
R301 07-10471-10 470¡1/4W ±5% Carbon Film Resistor
R311, R315, R346, R361 07-10102-10 1k¡1/4W ±5% Carbon Film Resistor
R345 07-10122-10 1k2¡1/4W ±5% Carbon Film Resistor
R375 07-10222-10 2k2¡1/4W ±5% Carbon Film Resistor
R364 07-10682-10 6k8¡1/4W ±5% Carbon Film Resistor
R310, R316, R333, R335,
R342, R343 07-10103-10 10k¡1/4W ±5% Carbon Film Resistor
R362 07-10153-10 15k¡1/4W ±5% Carbon Film Resistor
R302, R363, R365 07-10223-10 22k¡1/4W ±5% Carbon Film Resistor
R317 07-21500-10 150¡1/4W ±1% Metal Film Resistor
DESCRIPTION
L CHANNEL AMP BOARD