Fender Rumble-75 Schematic
INPUT 1
INPUT 2
100mVAC
*0mVAC
J1
100mVAC
TP17
J2
TP18
R7
68k
R6
1M
R8
68k
*TP17 -18. Remove the plug from J1 and
insert it into J2 for the (*) measurements.
Return signal to J1 for remaining measurements
+16V
-16V
12348 7 6 5
430mVAC
*215mVAC
TP19
D1
U2-D
12
13
D2
C1
14
TL074
22
R14
33k
R13
R1
10k
100k
C2
22
R11
62k
R46
1.5k
430mVAC
*When ENABLE
1.87VAC*
button is pressed in
TP20
U2-B
5
7
TL074
6
C10
470pF
R31
4.7k
R30
3.3k
C14
.47
J175
R35
250k15A
GAIN
Q4
D10
CW
C16
22
D11
RED
D12
RED
C17
CW
22
R45
10kB
BLEND
R76
18k
C53
.01
R38
10k
R36
100k
R68
100k
R75
.001 C48
6.8k
C46
+16V
R39
10k
Q6
MPSA63
-16V
Q3
J175
C7
C19
R25
62k
1
R32
100k
D9 D8
220pF
C43
12
TL074
13
R47
4.7k
R67
100k
33pF
2
3
Q2
J113
22
U7-D
14
R69
100k
R23
250k15A
VOLUME
U2-A
TL074
CW
1
260mVAC
TP22
C37
680pF
R57
47k
C36
.22
C35
.047
S3-A
SCOOP
72mVAC
315mVAC*
TP21
*When ENABLE
button is pressed in
324mVAC
R58
4.7k
C42
C39
.01
R59
39k
R53
75k
R52
15k
.01
R66
330k
SCOOP
3
TL074
2
R73
750k
R64
22k
C41
.1
R56
S3-B
22k
U7-A
C45
180pF
R65
56k
TP23
1
S2-B
PUNCH
C29
4.7
R51
1M
PUNCH
R79
4.7k
U7-C
10
8
TL074
9
C32
.022
C34
.068
C52
.01
R77
270k
R50
47k
R48
(80Hz) (5kHz)
47k
R62
50kB
CW
BASS
S2-A
C49
.22
R80
5.6k
C50
.01
U7-B
5
7
TL074
6
R74
270k
.0015
(400Hz)
R78
50kB
LOW MID
C56
.047
C57
12
13
R82
270k
CW
R81
6.8k
TL074
U8-D
(1.2kHz)
R85
50kB
CW
HI MID
C61
.015
C62
560pF
14
R89
270k
R93
50kB
CW
TREBLE
R88
6.8k
U8-B
5
7
TL074
6
R91
6.8k
C68
.0068
324mVAC
TP24
U8-A
3
C54
R84
1
TL074
2
4.7
C58
33pF
R83
47k
9
22k
10
R86
100k
R87
47
TL074
R90
C67
R92
22k
U8-C
8
47
R120
1k
22
50V
R118
100k
R119
1k
323mVAC
TP25
C88
220pF
C82
220pF
J5
LINE OUT
REV. APPROVEDDATEDESCRIPTION
PR850A
R E V I S I O N S
19-AUG-09 I D K
DD
-15.5VDC
TP16
+15.3VDC*
R10
100k
EXTERNAL FOOTSWITCH
LATCHING SWITCH
J6
4
11
+16V
-16V
FOOTSWITCH
C44
.1
U2-E
C13
.1
TL074
C59
.1
4
U8-E
11
C60
.1
C
*OPTIONAL LED
C11
.1
LM13700
11
U1-C
6
TL074
DGND
C12
.1
R123
C87
220pF
1.2k
TL074
R122
300
R42
10k
C8
.1
4
U7-E
11
C51
.1
+16V
Q9
S1-A
S1-B
ENABLE
8
4
U10-C
R44
2.2k
C27
4.7
4560
KTA1266
C23
.47
8
U9-C
4
WJ1
RED
WJ2
BLACK
R43
3.3k
-16V
R121
1.5k
WJ7
RED
WJ8
BLACK
WJ3
RED
WJ4
BLACK
WJ5
RED
WJ6
BLACK
D16
RED
OVERDRIVE
D36
RED
POWER
Q8
R41
4.7k
C70
4.7
4560
C74
4.7
*When ENABLE
button is pressed IN
R20
10k
3
+
BI
R21
2
D
100
CV
4
-
+16V
7
8
5
BO
U1-A
1
LM13700
PA BREAKAWAY A
+25VA
10
7
MUTE
9
STBY
GA
TDA7294
1
U6-B
8
4
-25VA
MUTEA
STBYA
B
+29.5VDC
TP3
D25
6A4
+25V
-25V
FUSE RATING
C63
4700
40V
CS1
CHRGND
C65
4700
40V
F1 VALUE
F2A L 250V
F1A L 250V
-29.5VDC
TP4
CS2
AMPGND DGND
22.5VAC
TP1
P4
22.5VAC
TP2
TYPICAL POWER
ON/OFF SWITCH
A
UP
2A
1A
D26
C66
6A4
.1
250V
C64
.1
D23
D24
6A4
250V
4B
3B
6A4
LINE VOLTAGE
100-120V
220-240V
R70
47
1/2W
C30
47
C31
47
R71
47
1/2W
POWER TRANSFORMER
INPUT VOLTAGE
100V
120V
220-240V
R49
47
+27VDC
TP5
-27VDC
TP6
7815
123
C25
.1
C26
.1
7915
2 3
IN OUT
LABEL
076-RB75J
076-RB75U
076-RB75E
REAR VIEW
P7
4B
3B
1A
POWER
SWITCH
BLACK
2A
WHITE
BLACK
L
GRN/YEL
WHITE
N
F1
P6
250VAC
P8
BLACK
C89
.1
P9
WHITE
RED
YEL
RED
+15.5VDC
TP7
+16V
U4
OUTIN
ADJ
D18
C21
22
D17
C22
22
1
GND
U5
-15.5VDC
-16V
TP8
TO P4
-15.5VDC
TP12
R3
100k
-16V
MPSA63
Q1
R2
6.8k
R5
6.8k
DGND
PA BREAKAWAY B
+25VB
10
MUTE
0VDC
TP13
MUTEB
STBYB
TDA7294
9
STBY
4
1
GB
R4
4.7kR933k
C31C41C51C6
-25VB
7
U3-B
8
+4.3VDC
TP14
R12
33k
495mVAC
TP26
C38
22
R60
C90
47k
.001
R61
27k
STANDBY
MUTE_1ST
+25V
-25V
AMPGND
D28
D27
C77
R102
1k
22
R105
27k
STANDBY
MUTE_2ND
+25V
-25V
AMPGND
R18
2k
R17
4.7k
-16V
D6D5D3D4
R15
33k
R16
33k
1
D20
D19
LM13700
D13
MUTE_1ST
1N4448
J175
Q5
R26
33k
C9
100pF
U2-C
9
8
TL074
10
R55
1k
R54
27k
PW3
P3
C33
C47
22
50V
R104
27k
PW5
P5
C20
+13.4VDC
TP15
D7
14
10
+
9
BI
12
15
BO
D
CV
13
U1-B
-
16
R19
10k
DGND
R28
15k
R29
15k
R27
33k
C40
22
PA BREAKAWAY A
STBYA
MUTEA
GA
.1
C28
.1
GAA
R103
27k
PA BREAKAWAY B
STBYB
MUTEB
GB
.1
C18
.1
GBB
+25V
R34
33k
D14
R24
10k
R22
10k
D15
R37
33k
-25V
C75
1
C76
1
13
2
3
15
13
2
3
15
R33
9.1k
C24
+25VA
22
50V
6
U6-A
TDA7294
-25VA
C15
+25VB
22
50V
6
U3-A
TDA7294
-25VB
Q7
J113
10M
DGND
1.5VAC
3mVAC*
TP31
*When ENABLE
button is pressed in
J3
L
AUX IN
R
R106
47k
R110
47
47
R63
10M
C84
.047
TITLE:
D
RELEASE DATE: 19-AUG-09
C78
220pF
220pF
D33
J4
C79
220pF
R
HEAD PHONES
MAX HP OUTPUT, Vo = 2.99Vrms
280mW @ 0.1% THD INTO
32ohms (MIN) PER CHANNEL
BOTH CHANNELS DRIVEN, 100Hz
D35
MUSICAL INSTRUMENTS
Corona, CA U.S.A.
SERVICE DIAGRAM, COMBINED
RUMBLE 75
BASS AMPLIFIER
850KKI012DRAWN: IDK/dBL
SHEET: 1 OF 2
C
B
A
(schematic)
REV.DRAWING NUMBERSIZE
A
C80
R107
220pF
47k
R100
+7.0VDC
TP9
15k
R101
5
68k
6
R99
10k
100pF
R97
15k
R96
5
4560
6
R94
47k
C72
100pF
D32
+9.5VDC
TP10
AMPGND
THIS DOCUMENT CONTAINS INFORMATION OF
A PROPRIETARY NATURE TO FENDER MUSICAL
INSTRUMENTS AND IS SUBMITTED TO YOU IN
CONFIDENCE AND SHALL NOT BE DISCLOSED OR
TRANSMITTED TO OTHERS WITHOUT AUTHORIZ-
ATION FROM FENDER MUSICAL INSTRUMENTS.
CHECKED BY:
DATE:
APPROVED BY:
DATE:
R115
100k
68k
R95
10k
C69
100
16V
DATABASE FILE: Z850S.SCH
4560
R98
47k
C73
R117
R113
U10-B
U9-B
+16V
47k
47k
5.0VAC
TP29
14
+25V
D21
1N4003
P1
R72
D22
Fr2.7
1N4003
2W
C55
.1
-25V
5.0VAC
TP30
14
+25V
D29
1N4003
P2
R116
D31
Fr2.7
1N4003
2W
C81
.1
-25V
R40
OUTPUT POWER TEST:
8ohm RESISTIVE LOAD CONNECTED BETWEEN P1 & P2
RATED LINE VOLTAGE SUPPLIED TO UNIT
SIGNAL APPLIED TO
OUTPUT VOLTAGE MEASURED WITH A DVM BETWEEN P1 & P2
OSCILLOSCOPE PROBE MAY BE CONNECTED TO P1 and/or P2, BUT
DO NOT GROUND THE BLACK (-) SPEAKER CONNECTION (P1)!
UNDER THESE CONDITIONS, VERIFY THE FOLLOWING:
FREQ
LIMITER ON
LIMITER OFF*
*When ENABLE button is pressed IN
BLACK
WHITE
AUX-IN JACK (J3)
100Hz 1kHz
69W (23.5Vrms)
<0.3% THD
75W (24.5Vrms)
<0.3% THD
-
12" 8-ohm SPEAKER
+
8. THIS POWER AMPLIFIER OPERATES IN A BRIDGED CONFIGURATION.
NEVER CONNECT THE BLACK (-) SPEAKER OUTPUT DIRECTLY (OR INDIRECTLY
THROUGH GROUNDED OSCILLOSCOPE PROBE) TO GROUND!
7. AC AND DC VOLTAGES ARE READ TO GROUND WITH A DVM UNDER
THE FOLLOWING CONDITIONS:
6. LAST REFERENCE DESIGNATORS: C90, D36, F1, J6, P9, PW5, Q10,
R123, S3, U10. NOT USED: D34
5. THIS SCHEMATIC IS FOR PCB FABRICATION P/N 850VKI011 AND
PCB ASSEMBLY P/N 850KKI010.
4. ALL DIODES ARE 1N4448.
3. ALL POLARIZED CAPACITORS IN uF, 20%; 25V MINIMUM.
2. ALL UNPOLARIZED CAPACITORS IN uF, 10% OR BETTER; 50V MINIMUM.
(POWER SUPPLY BYPASS CAPACITORS ARE 20%).
1. ALL RESISTORS IN OHMS, 5%; 1/4W.
NOTES: (UNLESS OTHERWISE NOTED)
69W (23.5Vrms)
<0.3% THD
75W (24.5Vrms)
<0.3% THD
UNIT AT RATED LINE VOLTAGE
8 OHM RESISTIVE LOAD AT P7-P8
NO INPUT SIGNAL FOR TP1-16
100mVRMS, 100Hz SINEWAVE INPUT SIGNAL AT J1
ALL CONTROLS AT 12 O'CLOCK (50% ROTATION)
ENABLE SWITCH S1 OUT (OFF), EXCEPT AS NOTED* FOR TP16,20,21,29-31
VOLTAGES MAY VARY BY +/-20%
MUTE_2ND
MUTE_1ST
STANDBY
R112
R114
33k
33k
D30
C71
47
16V
515mVAC
TP27
U10-A
7
3
1
4560
2
R111
47 C83
515mVAC
TP28
U9-A
7
3
2
0VDC **
+7.0VDC
**With plug inserted
in HEADPHONES jack
4560
R109
TP11
R108
1
47
D
G
Q10
S
ENGR: IDK/dBL
8 7 6 5 4 3 2 1
Loading...