Hughes & Kettner GrandMeister 36 Head Service Documents page 30

1 2
+15V +15V
+15V
+5V +5V
R15
SGND
10K*
U1B
MC33078
5
+
D 7
+7,5V
6
-
TP203
R16
22,0uF/16V-S4
TPTHTH25
10K*
C33
+7,5V
Ret. PRE-TUBE
Ret. PRE-TUBE
R81
12K
680p/100V-K
C53
AD5282BRU200
TREBLE
U6A
C54
13 A1
Hi
14
A
C
12
Lo U9B
560p/100V-K
HCF4053BM1 B1
10MEG*
R66
R88
R89
24K
A2
15 W2
68K U9C
U6B
2 B2
Lo C39
15
B 56n/63V
1
Hi
HCF4053BM1 U10C
C40
15 W2
56n/63V
10MEG*
R69 C64
1n5/63V
C24
100uF/16V-S6
B
R50
1K0* BC817-25
R119 Q11
10K*
D10
LED-Boost
LED-Boost
UDZS7.5B
D13
D18
UDZS7.5B UDZS7.5B
Ultra
Ultra
D8
D14 UDZS7.5B
Lead
Lead
LL103B D15 UDZS7.5B
C-Gain1
C-Gain1
D16 UDZS7.5B
Clean
Clean
D17 UDZS7.5B
LED-FX-Loop
LED-FX-Loop
D9
A
R120
LL103B
1K0*
All rights reserved. No part of this schematic may be reproduced, stored in a retrieval system, transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the author.
1 2
3
R62 R64
Input Signal
Input Signal
10K 10MEG*
U5A
14
+15V +15V A
HCF4053BM1
C34
C35
2,2uF/25V-TC
2,2uF/25V-TC
C37
1n/63V
GAIN1
+7,5V W2 15
U8C
R90
R91
220R
+7,5V
220R*
C23
100uF/16V-S6
U2B
W1 3 5 MC33078
+
7
6
-
D6 D7
ZMM5.6 ZMM5.6
R92
U10B
4K7
U6C
AD5282BRU20
R97
2 4
2K2 HCF4053BM1
U7A
VOLUME
C60
22,0uF/16V-S4
10MEG*
R70 R110
150K
10MEG* C65
R86
R71 1n5/63V
22K
C66 22,0uF/16V-S4
680p/100V-K C61
C67
3n3/63V
+15V
+15V
U5D
11
C-Gain1-A-Switch
A
10
Boost-CR-LE-UL
B
9
Boost-UL
C
6
EN
HCF4053BM1
U6D
11
CL
A
10
UL
B
9
LE-UL
C
6
EN
HCF4053BM1
U7D
11
UL
A
10
CL
B
9
FX-Loop-ON
C
6
EN
HCF4053BM1
3
4 5
+15V
U1A
3 MC33078
VCC
+
1
13 2
Hi -
12
Lo
VEE 47p-K*
C42
C41
10n/63V
R74 R75
R77
47K 47K 4K7
R6 R76 R63
4K7 10K
1K0
C38
R73 D2
27K PMLL4148
100n/63V
R106
D3
820R
R105 C58
PMLL4148
8K2
33n/63V
C55
330p-K*
U5C
220n/63V
3
C56 Hi
4
C
5
Lo
R68
2K2 10MEG*
HCF4053BM1
R104
R98
2K7
R93
4K7
R102
2K2
Send EXT-FX
Send EXT-FX
Ret. EXT-FX
Ret. EXT-FX
C48
C47
10,0uF/16V-S4
U7B
MC33078
U7C +15V
HCF4053BM1
R72 U2A
10MEG*
3
VCC
+
R112 33K
2
-
47p-K*
VEE
C43
2,2uF/25V-TC
22K R82
C36
+15V
R111 D19
470R/1W ZMM7.5 SDA
16
Vdd SCL
8
Vss
+5V +15V
7 U8A
Vee
7 5
SCL VDD
8 12
SDA VSS
13 9
VL AD0
16 6 10
Vdd SHDN AD1
1 11
O1 GND
8
Vss
AD5282BRU20
7
Vee
U9A
7 5
SCL VDD
8 12
SDA VSS
16 13 9
Vdd VL AD0
6 10
SHDN AD1
8 1 11
Vss O1 GND
7 AD5282BRU200
Vee
+7,5V-A-Switch
C19
100n-K*
4 5
6 7
TP207
TPTHTH25
2n2/63V
C44
R7
1K0
R78
2K2
U8B
3 W1
Send PreTube
Send PreTube
GAIN2
C17
R65
10MEG*
100n-K*
U5B
C18
C59
100n-K*
22,0uF/16V-S4
C57
TP208
TPTHTH25
220n/63V
RESONANCE
4K7
U11B
R96
4 B1 A1 2
AD5282BRU20
470K*
15n/63V
3K9 C63
R99 R94
2K2
4K7
+15V R107 U11C
R95
AD5282BRU20
4K7
U3A
3 MC33078
VCC
+
1 R103
2
-
1K5
220p-K*
22n/63V
R84
R115 C69
C68 22K
VEE
15K
22,0uF/16V-S4
R83
C62
22K
C51
R114
TP210
1
8K2
10,0uF/16V-S4
TPTHTH25
Ret. MOD-FX
C50
R101 TP211
2K2 TPTHTH25
10,0uF/16V-S4
Send MOD-FX
Send MOD-FX
R34 D20 D21
SDA
22K* ZMM2.7 ZMM2.7
SCL
+5V +15V +5V
U10A
7 5
SCL VDD
8 12
SDA VSS
13 9
VL AD0
6 10
SHDN AD1
1 11
O1 GND
AD5282BRU20
NA = not assembled part ----- EX = exclusive part, no alternative allowed
U11A HT = high temperature part, assemble with distance from PCB
7 5
SCL VDD
8 12
SDA VSS
13 9
VL AD0
6 10
SHDN AD1
1 11
O1 GND 66606 St. Wendel / Germany
AD5282BRU20
HU0212-SP-R01
Number:
Drawn by: B. Schneider
B. Schneider
Checked by:
PCB No.:
Filename: HU0212-SP-R03_Gain_EQ.Sch
6 7
8
Ret. REVERB
Ret. REVERB
C46
R79
10,0uF/16V-S4 Preamp-OUT
22K
MC33078
Preamp-OUT
U4B
5
+
R87
7
6 1K0
-
R85 22K
R80
D
22K
+15V
U4A
3 MC33078
VCC
+
1
2
-
VEE
R100
10,0uF/16V-S4
2K2 C49
Send REVERB
Send REVERB
TP209
TPTHTH25
R28
22K*
C
MC33078
R108
5 U3B
+
7
6
-
15
R109
47n/63V 82K
C71
C70
47n/63V
R116
R113
33K
33K
C52
10,0uF/16V-S4
B
Title:
GrandMeister 36
µC and Digi-Pot Board
A
Pre Amp
1 C
Version: Revision:
Date: 08.02.2013 Page: 6
08.02.2013 7
Date: Pages
8