NAD C-272 Service manual
NAD
SERVICE MANUAL
C 272
STEREO
C 272
STEREO
AMPLIFIER
AMPLIFIER
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 = +2.3 dB
IHF dynamic power
(Maximum short term power per channel) 8 ohms: = 230 W (23.6 dBW)
4 ohms: = 410 W (26.1 dBW)
2 ohms: = 520 W (27.2 dBW)
Damping factor > 150
(ref. 8 ohms 50Hz)
Input Impedance R = 20 kohms
C = 470 pF
Input sensitivity (for rated output into 8 ohms) 1.2 V±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 W 25.2 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 (29.0 dBW)
IHF dynamic power 4 ohms: 1200 W (30.8 dBW)
DIMENSIONS AND WEIGHTS
Net Weight 12.5 kg ( 27.5 Ib)
Shipping Weight 14.2 kg ( 31.3 Ib)
Dimension (W × H × D) 435 × 133 × 350 mm
ALIGNMENT PROCEDURE (C272)
I. INITIAL ADJUSTMENT (No load connected)
A. OUTPUT OFFSET VOLTAGE
1. Connect a DC Millivoltmeter to L Channel TP2 (DC) and TP8 (GND).
2. Turn unit “ON” and adjust VR301 (100ohms) to get a reading of 0V+/-30mV.
3. Connect a DC Millivoltmeter to R Channel TP5 (DC) and TP7, then adjust
VR401(100ohms) to get a reading of 0V+/-30mV reading on meter.
B. IDLING CURRENT
1. Connect a DC Millivoltmeter to L Channel TP1 (IDL) and TP3 (IDL), then adjust
VR302 (500 ohms) for 6~7.5mV reading on meter.
2. Connect a DC Millivoltmeter to R Channel TP4 (IDL) and TP6 (IDL), then adjust
VR402 (500 ohms) for 6~7.5mV reading on meter.
II. ISC ADJUSTMENT (WITH LOAD CONNECTED)
1. Connect a DC Millivoltmeter to Power Board CB725, and connect 4 ohms load to
both L&R speaker output terminals. Then feed 20kHz signal to Fixed In RCA.
2. Turn unit ”ON” and try to get 15W on speaker output terminal. Then adjust VR701
(82kohms) to get a reading of 0V+/-10mV.
3. Change the load to 8 ohms and try to get 160W on speaker output terminals.
Then adjust VR701 (82kohms) to get a reading of 1.4V+/-30mV.
III. FINAL ADJUSTMENT
Repeat procedure A and B for offset voltage and idling current alignment respectively.
DRAFT
Date:
Date:
Date:
Date:
PT-OUT
AC-DET
R765
10K
D719
1N4148
Project:
by: by: by:
Document
Number:
Drafted
C272
HS4_C272_B007 V3.0-MAIN.sch
PL Checked Approved
PTA Checked
by:
State:
Sheet:
PROTECT-I
R-OUT
L-OUT
R773
330u/16V
C758
220n/63V
C757
C756
4u7/100V
10K
D718
10V
ADD R799 1/4W 2K
56K
R772
56K
R771
22K
1
2
uPC1237HA
IC705
5
3
4
6
R763
10K
R764
10u/50V
C754
REV. DateECN No. DESCRIPTION APPRO.
R762
22K
RL703B
RL702B
CHANGE R744 TO 100
8
7
47u/50V
36V
36V
1N4148
22K
D713
C755
N.I.
N.I.
R770
56K
5K6
0
0
C5
C6
R769
R767
220/2W FP
R5
R6
+12V TRIG
100
R768
10K
+V34
R766
A1015
Q715
NAD ELECTRONICS INTERNATIONAL
SW704C
BRIDGE
789
270K 1% MF
PJ701
3PIN
L-OUT
R744
CZ712
2K
-18V
D708 1N4148
200/1W FS
R746
1N4148
D724
101112
123
R792
R743
249
IN
LM337M
R739
R-OUT
R-OUT
270K 1% MF
123
AUTO TRIG
SW702A
R799
2.2K
123
-18V
R779 10K
D722 1N4148
Q716
C1815
22n
100V
22u/50V
3K32
IC703
10u/50V
22n
100V
2200uF/50V
L-OUT
R789
1N4148
D709
-18V
1K
C747
C745
R741
C743
C741
C739
123
R778 4K7
-18V
R755
27K MF
560
D721
D720
4K7
1% MF
1% MF
10u/25V
1u/50V
1u/50V
R745
TRIG OFF
4
18VTEST
CB723
+18V
-68V
R777
10K
R793
C1815
1N4148
1N4148
R774
22n
100V
22u/50V
3K32
10u/50V
22n
100V
2200uF/50V
22u/50V
R753
100K
R788
100K
1% MF
R759
91K
10u/25V
C752
1% MF
62K
C751
C749
C748
R748
100K
123
Q717
C746
C744
R740
C742
C740
C738
C765
R757
TL082CP
TL082CP
R752
1M
1
3PIN
123
123
4PIN
+18V
AUTO TRIG
R776
0
LM317M
10u/25V
C767
IC704A
IC704B
VR701
82K
+18V
CZ711
CZ706A
+5V
68VTEST
6
5
4
SW702B
R742
249
IC702
200/1W FS
1M
ISC-S
SW703A
SOFTCLIP
SW704D
BRIDGE
PROTECT-T
MUTE-R
POS90
POS80
SC-P
CZ710A
8PIN
1234567
-68V
CB720
D715 24V
1N4148
+68V
D716
-64V
+5V
B-
R797
10K
R791
100K
PT-OUT
-68V
R775
560
+18V
+18V
R740--R743=>1% MF
IN
D707 1N4148
R738
+V34
1N4148
D723
100K 1% MF
10u/25V
C753
1% MF
R756
390K
1K
10u/25V
C750
1N4148
1N4148
D711
R751
R750
10K
10K
ISC-C
1
2
CB725
PTEST
OVERI-S
SC-N
+68V
-68V
2PIN
8
B-
R785 1K
10u/25V
C764
R783 25K
R7811KR780
R786
22K
-18V
-18V
R747
470K
C735
100V
22n
22K 1%MF
C733
4u7/100V
R733
1K
C731
47P
KSA1220
Q709
1K
100u/25V
C729
R724
33/FS
1K
R722 1K
1000u/100V
C724
22n/100V
C722
1N4148
D712
0.1u
10uF
R758
1000u/16V
+18V
R754
TGND
D710
STANDBY TRANSFORMER
T702
!
R749
12345
BG-G
CZ714A
2
456
C737
R737
Q712
A872
R728
R726
C710
C709
C708
0.1u
-
S2
C706
0.1u
10
1
230V
BG-S
1
10u/25V
C763
1K
SOFTCLIP
SW703B
22u/100V
1N4148
D705
47u/100V
+T5V
IC701 7805
IN
C707
DB104
++-
ACS1AC
9
8
4
2
120V
BG-SIGNAL
SW704A
123
R784 1K
D71424V
R782 25K
C1815
Q718
1%MF
1N4148
1N4148
0.1u
47u100V
C726
TGND
TGND
B705
7
CZ705
SW704B
BG-GND
GND
1
456
R790 2K2
+18V
+64V
PROTECT-I
+18V
22u/100V
C736
100V
C734
22n
1N4148
D706
R735
3K3
D704
C1775
Q711
D703
C727
R729
100
C725
+18V
CB724
N/A
1
2
3
2K2
R706
10K
T6.3AL/250V(AH)
T4AL/250V(CE)
F701
56
BG-O
2
1K8
R730 1K
R705
Q701
!
1K
R731
2
2PIN
C1815
C1815
R732
C1775
1K
1K
C723
C721
C1815
1
MUTE-L
POS90
8
+18V
ISC-C
CB716
8PIN
R-OUT
M-TEST
ISC-C
22K
22K
1K
2PIN
CZ709A
+68V
1
2
ISC-S
R715
R714
C1815
Q703
R708
22K
CB705
1 2
100V
C1815
A1015
R713
ROUT
1
2
P17 ROUT
RL702A
RL-LCH
C760
22n
-64V
Q705
Q704
R710
100
TIC116D
!
TC702
R712
1K
B704
DB104
!
P14 ROUT
RB
RA
OVERI-S
POS80
SC-P
SC-N
+68V
-68V
CZ713A
1234567
Q713
R760
22K
R761
22K
Q714
PROTECT-T
+68V
R736 22K 1%MF
10u/100V
C732
R734
9K1
1%MF
C730
47P
Q710
KSC2690
Q708
R727
100u/25V
C728
R720
100
R723
33/FS
R725
R721
1K
1000u/100V
22n/100V
60.5V AC
4
4PIN
CZ706
DB104
B703
!
123
32.5V AC
D701
C766
CZ704
5V
RL701B
12
2
2
1
1
C270 STANDBY BOARD
+T5V
STAND-BY
RL701A
FUSEABLE : 4 X 1/1W
!
2PIN
2PIN
CZ703
CB703
5PIN
5PIN
R704
CZ702
CB702
YEL
3
R703
BLU
4
1N4148
4n7/400V
2PIN
2
P18 SGND
C762
2n2
R719
220K
MF 1%
R718
9K1
N.I.
22n/250V
C714
22n/250V
C712
-
S2
22n/250V
C705
10%
-
0.5A0.5A
S2
22n/100V
C704
10%
!
R702
WHI
5
2
GND
1
P10 PGND
C720
C718
C716
++-
ACS1AC
++-
ACS1AC
12345
12345
BLU
6
G4
G2
!!!
R701
2PIN
P12 +64V
+64V
CB718
1
2
-64V
P8-64V
AC-DET
YEL
VIO
789
-64V
CB708
2PIN
+64V
P7-64V
G3
BINDING POSTS
G1
2n2
A1015
A1015
Q707
C719
N.I.
C717
C715
22n/250V
C713
22n/250V
C711
++-
ACS1AC
22n/250V
10%
++-
10A10A
ACS1AC
10%
H2
L2
12345
12345
ORG
1
+64V
-64V
2PIN
1
2
P9 PGND
P11 +64V
LB
CB715
LA
RL703A
RL-RCH
100V
C761
22n
Q706
1N5401
MF 1%
R717
100
4X10000uF/80V
+20%/-20%
TIC116D
!
TC701
R707
1K
-
B702
KBU1004
!
52.1V AC
S2
C703
-
!
B701
KBU1004
33.1V AC
S2
22n/250V
C702
H1
L1
5PIN
5PIN
GRY
BLK
101112
T701:
TI-65381: AC
230V
LOUT
GND
CB719
CB707
2PIN
1
2
P15 LOUT
P16 SGND
P13 LOUT
L-OUT
1 2
C759
CB717
M+TEST
2
1
+64V
0.025/3W 10%
R716
D702
C715--C718
R711 1K
R709
100
A1015
Q702
CZ701
CB701
RED
MAIN TRANSFORMER
!
T701
LM317
LM337
123
1:ADJUST,2:OUT,
3:OUT
3:IN
1:ADJUST,2:IN,
LM317:
LM337:
NOTE:
1. RESISTORS ARE CARBON FILM 1/4W 5% UNLESS SPECIFIED.
FP - FLAME PROOF 5%. FS-FUSIBLE 5%
MF - METAL FILM 5%. CE-CERAMIC CASE 5%
2. ALL CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 20%
3. COMPONENTS WITH "N.I." MEANS "NOT INSERT".
4. COMPONENTS WITH " * " ARE ADJUSTABLE PARTS.
5. COMPONENTS WITH " " ARE SAFETY CRITICAL PARTS.
2:GND,3:OUT
LM7805 1:IN
123
!
RAK
TL431
-
2.5Vref
Anode (A)
2
RSCN
RSCP
R425 100
R470 100
-V68R
100V
100 MF 1%
R423
1N4148
-V64R
1K MF 1%
R416
10K
C410
0.1u
R421
D406
2K2
3W FP
1W FP
75
1W FS
0.2
1W FS
0.2
1W FS
0.2
1W FS
0.2
0.1u
100V
C419
10u/100V
1N4148
D405
R444
100u/25V
R449
R451
R453
R455
R469
C416
18V
R415
1K
2SC1815
Q408
Q412
2SC1815
BAV21
D408
R443 10K
R442 10K
C412
D402
10uF/25V
C404
R414 100
22P/500V
TL431
500V
t=80 C
t=90 C
C407
470P
Q411
1W FP
IC402
R467
R466
-V68R
8PIN
2SA872
2SD669A
510
C414
Q420
Q422
Q424
Q428
CZ710
39K
Q407
100K
R441
L402 10uH
2SA1837
2SC5200
2SC5200
2SC5200
2SC5200
R-MU
1234567
MUTE-R
POS90
LM7805
TL431
R-MU
R413
R426
4R7 FS
R439
R440 33
Q418
POS80
R471 2K2
RSCP
SC-P
Reference(R)
1
+
TL431
Cathode (K)
3
100
R412
2SA872
Q406
R-FDBK
R438
3R3
1W FP
VR402
500
1
IDLING-I
5W
100V
RSCN
SC-N
OVERI-S
-68V
2SC1815
220P
R420
33
0.5W 1%MF
2SD669A
TP6
R457
0.05
C418
0.1u
+V68R
3PIN
8
+68V
2SC5200
2SA1015
2SA970
KSC2690
2SD669
2SD667A
Q429
Q430
22K
C402
Q402
2SC1775
R422 9K1
C408
100P
Q414
1W FS
R446
820
GND
R459 10/1W FS
CZ714
123
GND
2SA1943
BCE
2SA872
ECB
2SB649
ECB
2SB647A
ECB
TIC116D
KAG
BUF-R
123
GND
GND
RIN
1
2
2SC1775
2SA872
R402
0.5W 1%MF
R419
10K
R427
39K
R437 100
+V64R
KSC2690
TP7
BG-GBG-G
BG-S
CZ401A
3PIN
CZ401
2PIN
470/MF
R401
C401
10uF
100 MF
R403
2SA872
BG-S
R418
1%MF
47K
100 MF
R428
R429 100
1W FS
-V64R
Q415
Q416
0.1u
OFFSET
TP5
R460 3R3/1W FP
R472 8K2
1%
2SA1943
A872
B649
B647
TIC116D
BG-G
C2878
Q401
150 1%
Q413
220
A1015
C415
R-FDBK
L403 1uH
R458 8K2
1%
Q431
R408
33
R417
100V
2SB649A
R447
5W
100V
BG-S
R404
100
2SC1775
2200u/6.3V
C406
C423
0.1u
3R3
1W FP
1K2
TP4
IDLING-I
R456
0.05
C420
22n
CZ718
2PIN
2
ROUT
Q403
R430
R445
C1815
1
GND
1K
Q425
-18M MGND
-18M
C403
4R7 FS
R436 33
R461
15K
1% MF
100P
MF
MF
100P
1% MF
D401
18V
10uF/25V
1K
R405
39K
2SC1775
R424
100K
510
1W FP
R431
L401 10uH
500V
2SC4937
Q417
Q419
2SA1943
Q421
2SA1943
Q423
2SA1943
Q427
2SA1943
R462
R465
22K
2PIN
1
2
GND
ROUT
C67
0.1u
R614
10K
R66
N.I.
C62
2.2M
R64
R63
2.2M
C61
R65
N.I.
R613
10K
C65
0.1u
R411
Q404
22P/500V
Q410
R432
TL431
IC401
470P
1N4148
D409
R463
22K
CZ705
R406 100
C405
2SB649A
BAV21
C413
2
-64V
1
+64V
Q66
Q64
1N4148
D407
R433 10K
R435 10K
Q426
2PIN
MGND
2SB647A
ML-FB
MR-FB
2SB647A
MGND
R410
10K
0.1u
100V
180
1
910 MF 1%
Q409
D404
100uF
CZ708
47/MF
R618
1N4148
D64
100/MF
47P
47P
100/MF
1N4148
D62
R617
47/MF
C409
VR401
R407
100 MF 1%
2SA1015
1N4148
D403
2K2
3W FP
C411
1W FP
75
1W FS
0.2
1W FS
0.2
1W FS
0.2
1W FS
0.2
0.1u
100V
C421
50V
6K8
2SA1015
10u/100V
MLO
R610
C610
220 MF
220 MF
C69
R69
1N4148
MRO
+V68R
2SA1015
Q405
R409
R434
R448
R450
R452
R454
R468
C417
10u
R464
C422
+V64R
1N4148
D63
2SK369
R62
R61
2SK369
D61
0
Q62
N.I.
N.I.
Q61
0
-V68L
100 MF 1%
-V64L
R616
MLO MRO
R615
100V
1K MF 1%
R323
1N4148
MGND
R612
1K
C64
39P
R620 10/MF
ML-FB
R621
C611
R619 10/MF
MR-FB
C63
39P
R611
1K
MGND
R316
10K
C310
0.1u
R321
D306
2K2
3W FP
1W FP
75
1W FS
0.2
1W FS
0.2
1W FS
0.2
1W FS
0.2
0.1u
100V
C319
10u/100V
1N4148
D305
R344
100u/25V
R349
R351
R353
R355
R369
C316
+18M
C68
0.1u
C270-INPUT BUFFER
Q68
2SD667A
2SA970A
Q65
1K MF
R68
C103 10n
63V
C104 100uF
C613 0.22u
C612 0.22u
C204 100uF
63V
C203 10n
CB61
9PIN
1K MF
-18M
R67
2SA970A
Q63
2SD667A
Q67
0.1u
C66
+18M
D302
18V
10uF/25V
C304
R315
1K
R314 100
2SC1815
Q308
22P/500V
C307
Q312
2SC1815
Q311
BAV21
D308
510
1W FP
R343 10K
R342 10K
IC302
TL431
C312
470P
500V
t=90 C
R366
t=80 C
R367
-V68L
2
GND
1
2
3
4
5
6
7
8
9
39K
2SA872
Q307
2SD669A
100K
R341
4R7/FS
L302 10uH
C314
2SA1837
Q318
Q320
2SC5200
Q322
2SC5200
Q324
2SC5200
Q328
2SC5200
CZ713
2PIN
1
BG-O
10uF
10uF
R313
R326
R339
R340 33
VARI-R
2M2
100P
+18V -18VC105
+18V
1
LOUT
2
LIN-
3
LIN+
4
GND
5
RIN+
6
RIN-
7
ROUT
8
-18V
9PIN
9
C205
220P
100
R312
2SA872
Q306
R320
33
L-FDBK
R338
3R3
1W FP
VR302
500
1
TP3
IDLING-I
0.05
5W
C318
0.1u
100V
LSCN
LSCP
1234567
+68V
SC-P
SC-N
OVERI-S
-68V
RCA2B
220 MF
R204
C202
CZ61
CZ301A
3PIN
123
GND
470/MF
10uF
R302
22K
C302
Q302
2SC1775
R322 9K1
0.5W 1%MF
C308
100P
Q314
2SD669A
R337 100
1W FS
R346
820
GND
R357
R359 10/1W FS
100/0.5W MF
L-MU
8
MUTE-L
POS90
POS80
RCA2A
VARI-L
R104
R203
2M2
C102
100P
BUF-R
GND
LIN
1
2
CZ301
2PIN
2SC1775
R301
Q329
2SA872
C301
Q330
100 MF
R303
2SA872
10K 0.5W 1%MF
47K 1%MF
R318
R319
R327
39K
100 MF
R328
R329
1W FS
100
-V64L
+V64L
Q315
KSC2690
Q316
0.1u
OFFSET
TP2
TP8
R360 3R3/1W FP
L303 1uH
R358
+V68L
CZ709
8PIN
220 MF
Q301
150 1%
Q313
220
A1015
C315
L-FDBK
F/V SW
R103
F/V SW
R308
33
R317
100V
2SB649A
R347
5W
100V
2
GND
SW705C
789
101112
SW705D
R304
100
2SC1775
2200u/6.3V
C306
C323
0.1u
3R3
1W FP
1K2
TP1
IDLING-I
R356
0.05
C320
22n
2PIN
1
LOUT
SW705A
F/V SW
F/V SW
Q303
R330
R345
1K
Q325
C1815
CZ719
123
SW705B
L-MU
C303
4R7/FS
R336 33
R361
15K
1
2
+64V
-64V
100P
R105
0
0
456
LSCN
R371 2K2
18V
10UF/25V
D301
1K
R305
39K
2SC1775
R324
100K
510
1W FP
R331
L301 10uH
500V
2SC4793
Q317
Q319
2SA1943
Q321
2SA1943
Q323
2SA1943
Q327
2SA1943
R362
R365
22K
CZ707
2PIN
FIXED-R
RCA1B
R202
2M2
C201
R205
LSCP
R325 100
R311
Q304
22P/500V
R332
TL431
1N4148
D309
22K
R370 100
R306 100
C305
Q310
IC301
470P
R363
220 MF
R201
1K
A1
A2
1K
2SB649A
1N4148
BAV21
D307
R333 10K
R335 10K
C313
Q326
100V
100P
RV1A
RV1B
10K
0.1u
1
Q309
D304
100uF
FIXED-L
RCA1A
R102
2M2
C101
R310
C309
VR301
180
910 MF 1%
R307
100 MF 1%
2SA1015
1N4148
D303
2K2
3W FP
C311
1W FP
75
1W FS
0.2
1W FS
0.2
1W FS
0.2
1W FS
0.2
0.1u
100V
C321
50V
6K8
2SA1015
C322
10u/100V
220 MF
R101
+V68L
2SA1015
Q305
R309
R334
R348
R350
R352
R354
R368
C317
10u
R364
+V64L
DRAFT
TO MAIN BOARD CZ61 PIN4
TO MAIN BOARD CZ61 PIN5
TO MAIN BOARD CZ61 PIN6
TO MAIN BOARD CZ61 PIN5
3PIN
3PIN
CB901
CB902
1
2
3
1
2
3
INSENSE BORAD
CZ901
S_LCH
1
2
3
3PIN
S901
CZ902
S_RCH
1
2
3
3PIN
R909
10K
C912
220uF/16V
D911
1N4148
R911
R910
10K
1M
C905
100nF
+5V
R914
10K
12
Q901
2SC1815GR
12
C909
0.1uF
CZ903
3PIN
R808
10K
R809
10K
R813
1M
R811
100K
U802E
74HC14
U802F
74HC14
C806
0.1uF
1011
1213
+5V
1 2
Q803
7 14
2SC1815
C805
0.1uF
U802A
74HC14
R815
10K
R816
10K
R817
10K
+5V
R818
10K
R819
10K
3
12
Q804
2SA1015
12
+5V
OUTPUT
C808
220uF/16V
CZ803
CB803
1
1
2
2
3
3
4
4
4PIN
4PIN
TO STANDBY BOARD CZ706
CB803A
123
4
4PIN
C802
0.1uF
R812
1M
CIN
RST
VCC
U801
CD4060
D801
1N4148
9
8
COUT
GND
C803
0.1uF
R801
3 4
+5V
C801
0.1uF
5 6
U802C
74HC14
C807
2.2uF
2M
11
12
Q801
2SC1815
16
+5V
U802B
74HC14
CB903
1
1
2
2
3
3
3PIN
CB903A
3PIN
CB802
4PIN
123
4
1
2
3
1
2
3
4
CB802A
4PIN
1
2
3
1
2
3
4
CZ801
3PIN
CZ802
4PIN
IN SENSE
+5V
TRIG IN
TO MAIN BOARD CZ706A
C809
0.1uF100V
R802
10K
R803
10K
R804
10K
+5V
R810
100K
COUT
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q12
Q13
Q14
R805
10K
R806
10K
R807
10K
U802D
74HC14
R814
200K
10
7
5
4
6
14
13
15
1
2
3
89
12
11
2
3
Q802
2SC1815
10
D
CLK
D
CLK
9
Q
SD
U803B
74HC74
8
Q
CD
13
+5V
C804
4
0.1uF
5
Q
SD
6
Q
CD
U803A
74HC74
7 14
1
D906
1 2
D903
1N4148
1 2
C901
100nF
R901
1M
+5V
R912
R903
100k
C903
100nF
R904
100K
12
R902
1M
C910
100n
100K
220uF/16V
1 2
1N4148
1 2
D902
1N4148
R906
100K
C911
D912
1N4148
D908
6
2
5
R913
100k
4
1
3
+5V
R905
100K
C902
100nF
1N4148
D901
R907
30M
2
3
R908
30M
6
5
1N4148
1N4148
12
1 2
1N4148
C906
10pF
U901A
LF353
8 4
12
12
+5V
C908
100nF
D910
1N4148
12
1 2
1N4148
C907
10pF
U901B
LF353
D905
D904
D909
D907
1N4148
1
C904
100nF
D913
1N4148
7
12
12
12
12
ATO BORAD
CZ804
12345
6
6PIN
CB804
12345
6
6PIN
P1001
AC INLET
CZ1003
2PIN
CB1003
2PIN
S1001
ROCK SWITCH
AC INPUT BOARD
12
C1001
4.7nF1000V
123
123
CZ1001
2
1
2PIN
CZ1002
2PIN
123
CB1002
2PIN
123
CB1002
2PIN
TO STANDBY BOARD CZ704
123
(AH VER.) (C VER.)
CB705
5PIN
12345
CB705
5PIN
12345
TO STANDBY BOARD CZ705
CB1001
2
1
2PIN
TO MAIN BOARD CZ711
TO MAIN BOARD CZ712
CB1001A
1
2
2PIN
CB1102A
1
2
3
3PIN
CB1101A
1
2
3
3PIN
1
2
3
3PIN
1
2
3
3PIN
R1105
1K
R1104
1K
R1102
R1101
47
0
AGND
BG
SC
+18V
PWR
LED1106
AMBER
LED1105
GREEN
LED1101
GREEN/AMBER/RED
TACT SWITCH&LED BORAD
R1103
510
GREEN GREEN GREEN
Q1101
2SA1015
Q1102
2SA1015
REV. DateECN No. DESCRIPTION APPRO.
ADD R914,C808,C911,C912
PN U1 CHANGED TO U801
ADD 0.1uF CAP FROM TRIG IN TO GND
R819 CHANGED TO 10KC022V1-013 03-12-10V3.7
12345
6
6PIN
GND
+5V
TS
TS1101
LED_SENSE
LED_TRIG
LED_TS
LED1104LED1103LED1102
Q1103
2SA1015
NAD ELECTRONICS INTERNATIONAL
Document
HS4_C272_B007 V4.0-ATO.SCH
Number:
Project:
C272
Drafted
by: by: by:
Date:
PL Checked Approved
Date:
PTA Checked
by:
Date:
Sheet:
State:
Date:
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