Marshall Amplification DSL40CR Service Manual page 23

4
MAIN PCB - FIG. B VOLTAGES
HT3
ULTRA CH
R97
100k
C70
R93
1% 0W6
1k0
4n7
400V
R92
V1:2 C68
R94
0W6 1%
ECC83 470p 470k
1M0
500V RL1:3
C69
LEAD1
680n
LEAD2
63V
R91
470k
R96 R95
1k8 47k RL4:3
AGND
C63
330p
50V
CLASSIC CH
PREAMP VOLTAGES - OUTPUT SET TO STANDBY
L5:2
No. TYPE PCB No. FEED
CLEAN / CRUNCH
C62
17 100k R89
1n
18 4k7 R38
100V
R104
RL5:3
10M
19 100k R86
R43
LT2
C61 2W FP
33R
20 2k2 R85
100p
50V
21 100k R82
LASSIC
22 1k R81
GAIN
23 ECC83 V3 P6
24 100k R80
1N5927B
5
* C47 220pF combo only
HT4 HT4
17 19 21
C5 C47
R89 R86
220p NF
100k 100k
500V
C59
C58
22n
22n
V2:1 R88 R84
400V
400V
ECC83 470k 330k
C60
2 7 2
47n
V3:1
V2:2
100V ECC83
ECC83
C57
R90 R38 R87 R85 R83
1M0 4k7 470k 2k2 18k
NF
18 20 22
R100
100k
PREAMP VOLTAGES - OUTPUT SET TO LOW
LOOP IN 1 7
LOOP IN LOOP OUT
V1 (DC) V2 (DC) No.
3 8
LEFT IN DSPL OUT
C92
5 9
AGND RIGHT IN DSPR OUT
V2 P1 360V 289V 17
13
REV1
680n
2 GPIO0
AGND 14
REV2
4 GPIO1
V2 P3 3.25V AGND 18
AGND 15
F/S DET
6 GPIO2
AGND 16
SCK
10 GPIO3
AGND 17
MOSI
V2 P6 360V 253V GPIO4 19
18
MISO
11 GPIO5
+V 19
LATCH
12 GPIO6
V2 P8 2.39V +V AGND 20 20
SW_LATCH
GPIO7
23 21 12Vin
DGND DGND 12V IN
V3 P1 370V 220V 21
24 22
DGND 3V3 OUT +3V3
V3 P3 1.53V AGND 22
DFX1
N/A 370V N/A 23
V3 P8 224V AGND 24
D2
R26
TR5 MPSA06
LT2
1% 0W6
100R
PGND
R138 R121
1% 0W6 0W6 1%
560R 560R
C48
C94
D23
100u
100u
35V
BZX55-10V
35V
6
HT5 HT5
23
R82
FIG B
100k
V3:2
ECC83
7
SW4:1
C56 C55 C53
R78
1% 0W6
10k
220n 470p 470p
R77
400V 500V 500V
33k
R76
10M
AGND
R17
68k
C52
SW4:2
22n
100V
R81 R80 R79
1k0 100k 1M0
24
SW4:3
C54 C51
22n R20 22n
100V
100V
10M
R24
1% 0W6
68k
SW4:4
TO REAR PCB
TYPE PCB No. FEED V1 (DC) V2 (DC)
CN17:1
CN17:2
100k R89 V2 P1 341V
AGND CN17:3
12Vin CN17:4
4k7 R38 V2 P3 3.09V
CN17:5
CN17:6
100k R86 V2 P6 341V
2k2 R85 V2 P8 2.26V
R70 R69 R68
100k R82 V3 P1 350V
10k 2k7 6k8
1k R81 V3 P3 1.43V
HT1
ECC83 V3 P6 N/A 350V
C45
100k R80 V3 P8 212V
220n
250V
R13
R61 270k
R23 C43
470k
10k 22p 500V
TR2
MPSA44 R53
1% 0W6
220k
C39 C44
R124 R55
+
0W6 1% 0W6 1%
7
TREBLE
CW
VR5:1
B200k
CLASSIC VOLUME
VR2:1
B1M CW
BASS
RL11:2
R74
270k
CW R140
180k
VR7:1
A1M
VR4:1
LOOP IN
CW
B1M
VR6:1
CW
B20k
ULTRA VOLUME
R73
18k
MIDDLE
PREAMP VOLTAGES - OUTPUT SET TO HIGH
No. TYPE PCB No. FEED
274V 17 100k R89
AGND 18 4k7 R38
239V 19 100k R86
AGND 20 2k2 R85
210V 21 100k R82
AGND 22 1k R81
N/A 23 ECC83 V3 P6
HT1
AGND 24 100k R80
R60
100k
MASTER 1
C27 C42
R44
47n 400V
1% 0W6
1M0
CW
100n
R139
400V
68k
8
A
R145
1k0
RL12:2
B
V1 (DC) V2 (DC)
V2 P1 333V 267V
V2 P3 3.02V AGND
V2 P6 333V 234V
V2 P8 2.20V AGND
V3 P1 343V 205V
V3 P3 1.39V AGND
N/A 343V N/A
V3 P8 207V AGND
DSL40CR service manual 23
BOOK-80015-01 | M3390.069
VR12:1
C
A1M
PS_IN