Pioneer M-790 Service Manual page 13

I 2 ; 3 I 4 b 5
M-790
Q7501:BIAS TEMPEATURE Q51, Q53, Q7505, Q7507: Q55, Q57:POWER TRANSISTOR
3.3 FRONT ASSEMBLY COMPENSAT ION DRIVER TRANSISTOR wae
OP+12V
N am
Bits Bn ice
FRONT ASSY (RWZ3697) 2 La acre
mm
or
A
V+81
107501 (172) :
Ny
NORMAL . +B1
VOLTAGE <9 BLOW OV 5
AMPLIFICATION
28
HM
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ono |
a ney up
x
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D —
2
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4). j
Le +B1 (5)
in FAN
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Or] raTle
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o EF GNoI() i m
"
CN7502 7
KM250NA10L
B
3
ft
7
in
4
>t
nl re
SHORT
LO
a o ; TRIG t
<N :
q
O © lopti2zv |G
FR.
= J7601
Cc OHHO7—1 25-2877 op-12v
o
x wi
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2 °
injg|
2 eps
SIGNAL ROUTE | i
o
=> AUDIO
SIGNAL (FRONT)
in
1€7501 (272) :
VOLTAGE
AMPLIFICATION Uber at
NOTES
D7524 188244
% ALL RESISTORS ARE JN OHMS, 1/10W. 5% UNLESS OTHERWISE SPECIFIED. A
*% ALL CAPACITORS ARE 1N MICROFARADS UNLESS OTHERWISE SPECIFIED. HSS) 04-02 1f \! ose
% THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY. D7526| R7550 \25C 31 B1N-O/R
REPLACE ONLY WITH PART NUMBER SPECIFIED ON SERVICE PARTS LIST. Orc ley es
% VOLTAGE VALUE 1S A REFERENCE VALUE BETWEEN THE GROUNDING. 220! 14:
D VOLTAGES SHOWN UNDER NO LOAD CONDITION.
» —L)J[D— SHOWS MODEL DEPENDENT BIAS CURRENT ADJUSTMENT TAP. Q7502:BIAS TEMPEATURE Q52, Q54. Q7506. Q75086: QS6,. Q58:POWER TRANSISTOR
INCREASING OR DECREASING THE BIAS BY SOLDERING BRIDGE. COMPENSATION DRIVER TRANSISTOR
* THE COMPONENTS SURROUNOED BY aes ARE NOT BELONG TO THE THIS ASSY. Dae
FRONT ASSY
17
47/16 JA
FRONT ASSY
Cs}
CN7504
AKC-113
BLOW TRIG
SCH-3