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SCHEMATIC DIAGRAM (1/4)
+18V
R154
R101
10
39k,MF,5%
Q103
C13
C2240
10u/35V
C103
100uF/16V
R103
R19
82,MF,5%
39K,MF,5%
Q101
C2240
C11
Q14
R111
C2240
C18
82,MF,5%
22p
10u/16V
RCA34D
R11
R14
Q12
R115
MAIN-IN R-CH
A970
33
470
100
C17
R12
0.1uF/63V
220K
R116
Q47
Q48
Q13
33
A1015
C2240
C1815
R15
22K
C12
470p
82,MF,5%
Q15
A970
R112
R418
R419
Q102
100
100
A970
R110
39k,MF,5%
+46V
D410
C104
R420
100uF/16V
36K
Q104
20V
R422
A970
-18V
1.1K
R155
R105
10
39k,MF,5%
C415
C14
10u/35V
C16
10u/25V
R424
220uF/63V
OFF
1.3K
1
4
2
5
3
6
R425
S41A
S41B
ON
1.3K
C416
R423
10u/25V
1.1K
-46V
D411
R201
R421
+18V
R254
39K,MF,5%
36K
20V
10
Q203
C2240
C23
C203
R416
R417
100uF/16V
10u/35V
100
100
R29
39k,MF,5%
Q201
C2240
Q46
Q45
Q24
R211
C28
C1815
A1015
C2240
82,MF,5%
22p
RCA34C
R24
MAIN-IN L-CH
R21
Q22
R215
A970
33
C27
470
100
0.1uF/63V
R22
220K
C21
R216
10u/16V
Q23
33
C2240
R25
C22
22K
470p,50V,20%
Q25
A970
Q202
A970
R210
39k,MF,5%
C204
100uF/16V
Q204
R255
A970
-18V
10
R205
C24
SUBOUT 1
39k,MF,5%
10u/35V
SUBOUT 2
J204
2PIN
J204
2PIN
JK41
N8C320D03
CZ45
CB45
HEADPHONE OUT R
1
3
2
2
3
1
HEADPHONE OUT L
PHONES SOCKET
R458
R459
100,FP ,5%,2W
100,FP ,5%,2W
POWER AMP CIRCUIT FOR Vm1.7
HEADPHONE OUT CIRCUIT FOR Vm1.7
PCB-1:MAIN BOARD FOR Vm5.0
PCB-10: HEADPHONE BOARD FOR Vm5.0
C720BEE POWER AMP CIR. R
R130
82/1W FS
R126
R142
C114
R119
0.1u 10%
2K7/2W FP
22,MF,5%
82,MF,5%
R128
R107
330/0.5W FP
Q114
D17
39,MF,5%
2SA1943
1N4148
D13
C112
1N4148
Q16
470p,100V,20%
R148
R136
A1015
Q112
15K
10
FS
R147
KSC2690
D15
TP3
1N4148
1K
KSA1220
Q18
R144
VR12
B647
R121
Q110
0.068/3W CE
300
D11
100K,MF,5%
C110
4.7V
47u/25V
R123
R138
47K,5%,1/4
Q111
D12
R145
390
Q19
KSC2690
C111
4.7V
0.068/3W CE
D667
R146
47u/25V
Q116
4K3 1W 1%
D16
KSC2690
C19
1N4148
TP4
22p
R139
470
Q17
Q113
C1815
FS
KSA1220
R137
10
C113
D14
R108
470p,100V,20%
39,MF,5%
1N4148
R129
330/0.5W FP
R120
82,MF,5%
R127
R143
2K7/2W FP
22,MF,5%
R131
82/1W FS
C115
0.1u 10% 63V
POWER AMP CIR. R
+46V
R230
82/1W FS
R226
FP
R242
R219
22,MF,5%
2K7/2W
82,MF,5%
R207
Q214
39,MF,5%
470p,100V,20%
2SA1943
D23
C212
1N4148
D27
Q26
1N4148
R236
A1015
Q212
R248
KSC2690
10
FS
15K
D25
TP2
1N4148
R221
R247
100K,MF
1K
Q28
Q210
VR22
R244
B647
KSA1220
300
0.068/3W CE
C220
C210
D21
22n 10%
4.7V
63V
47u/25V
R223
R238
47K
D22
C211
390
4.7V
R245
47u/25V
Q216
0.068/3W CE
C29
KSC2690
22p
Q29
D26
D667
R239
TP1
1N4148
470
Q213
Q27
KSA1220
R237
C1815
D24
10
FS
1N4148
C213
R208
470p,100V,20%
39,MF,5%
R220
82,MF,5%
R227
R243
R231
82/1W FS
2K7/2W
FP
22,MF,5%
C215
0.1u 10%
-46V
R453
220/2W FP
R452
220/2W FP
+46V
I/V For
R12/1
C12/1
Over
63V
6K8
47uF/25V
Current
Q12/1
Protection
A1015
R152
22K
Q11
C1815
C118
0.1u 10% 63V
R151
C120
22n 10%
10/1W FS
C119
L11
22n 10% 63V
1uH
R150
R156
1/1W FP
470K
C121
1uF,63V,5%
-18V
TL082CP/D
3
IC3A
1
2
+18V
STANDBY
+46V
+18V
R438
R437
R441
C122
22K
47K
15K
1uF,63V,5%
Over Heat Protection:
R158
R157
It shuts down the unit
-46V
2.2K
when the temperature on
470K
the heatsink is over 90C
degrees.
D43
It also shuts down the unit
1N4148
when the unit enters the
standby mode.
Q412
D42
C1815
1N4148
R439
T0=90 degree C
POSISTOR
R445
56K
R446
56K
+18V
+18V
C214
0.1u 10% 63V
ISC Circuit:
It switches the power
R483
R472
supply to a lower
C429
R252
voltage when the load
330K
470K
10u/25V
22K
impedance is low, or
the temperature on
R477
the heatsink is over
6
80C degrees.
47K
Q21
5
C1815
R251
C218
10/1W FS
0.1u 10% 63v
R473
C426
47K
R476
10u/25V
L21
1K
1uH
R250
1/1W FP
C219
-18V
22n 10% 63V
D420
R256
C221
470K
1uF,63V,5%
1N4148
D419
-18V
5
IC4B
1N4148
7
TL082CP/D
6
+37V
+18V
+18V
C222
R257
1uF,63V,5%
R258
R427
470K
2.2k
22/1W FP
R428
2K2
Q414
+12V
Q413
C1815
R429
C443
5K1
D669
0.1uF
C412
0.1u 10% 63V
-18V
- 18 -
D412
+37V
C436
1N4148
1nF
1
2
1
2
RL12/1
3
4
3
4
5
6
5
6
6
5
6
5
4
3
4
3
RL12/2
+37V
2
1
2
1
C435
1nF
D413
1N4148
R454
500
R442
+18V
Q416
56K
Q417
+3.25V
C1815
C1815
C420
+2.16V
R493
R449
0V
100u/16V
R440
10k
10K
2K2
R12/2
1
22K
IC44
6
UPC1237HA
2
+2.0V
0V
0V
0V
C422
C432
C421
330u/16V
0.22u
4u7/50V
R474
ISC CIRCUIT
1K
+18V
R471
R470
10K
10K
R482
R469
R468
D418
D417
C425
4K7
10K
22K
C430
1N4148
1N4148
10u/25V
D428
10u/25V
1N4148
R478
2
Q421
7
1
100K
C1815
3
R479
IC43B
TL082D
IC43A
100K
TL082D
C428
R486
R480
10u/25V
560K
6K2
C431
10u/25V
+18V
R491
R488
R467
T0=80 degree C
100K
39K
POSISTOR
Mount on the heatsink
R490
R487
100K
39K
SUPPLY CIR.
Q41
+37V
R45
2SD669A
33/0.5W FS
C47
D49
47u/25V
C413
18V
220u/35V
R411
R49
R43
R414
C45
2K2
22p
680
680
R47
680
MF
680
C411
C49
STANDBY
D403
0.1uF
47u/25V
R401
1N4148
Q43
C1815
R413
4K7
680
C41
0.1uF
R410
Q44
A1015
680
C46
R48
R44
R412
2K
MF
C48
C410
680
680
10u/25V
47u/25V
22p
C414
220u/35V
R46
Q42
33 / 0.5W FS
2SB649A
L OUT
R OUT
Binding Posts B
L OUT
R OUT
Binding Posts A
R455
500
Name
C720BEE PREAMP Vm1.2.SCH
R494
R450
10k
10K
SPK B
PROTECTION
SPK A
-30V
VFD AC1
VFD AC2
+18V
-18V
+12V
+5V
CB47
VFD AC2
1
VFD AC1
2
ISC TRIG
3
AC DET.
4
I-V
5
+37V
6
-37V
7
-30V
8
R41
+5V
9
680
10
10PIN
C43
220u/50V
+46V
-46V
CB49
C44
4
220u/50V
3
2
1
4PIN
R42
680
-37V
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