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NO
Check signal
at IC7(1). Set
scope sweep
. 5 /j.sec/cm.
Similar t o ^ l
H
Check signal •
|
at I C 2 ( 5 ) Q
NO
^ *
Check Q l & Q2 &
. assoc. circuitry.
Check IC2 for
shorted input.
YES
L
NO
YES
Check si;
at IC6(6)
NO
r
NO
gnal
O
YES
Check dc voltage
at IC6(4,8). Check
continuity between -
IC6 & IC7. Check
CR20, R31 & R32
Check signal
. at Q9(C). Set
scope sweep to
50 / i s e c / c m .
Similar
t o
^ f c
. Replace IC6
NO
H
Y
L „ Check dc voltage
|
atIC2(3); should-
^
be 4.0 to 5.5V
Troubleshoot
■T-42V supply
- j
u
(C2,CR2,R7)
YES
■ Replace IC2
Check signal
at I C 4 ( 5 ) ^ ~
Check dc voltage
N
£"atICl(8)
I
Check signal at-
Y E S
IC4(1). Set scope
L . sweep to 5 Msec/-
cm. Should be
similar to 4 f e
—OK—Replace IC1
Check dc voltage
,—at IC4(3); should"
NO be 8.5 to 9.6V
H
YES Check Q4 and
assoc. compon.
NO
YES
Troubleshoot
9. IV supply
(C5,CR7, R14)
- Replace IC4
Check dc voltage ■
r ~ a t IC3(8)
NO
Check signal at
IC3(7). Set scope
_ |
s w e e p t o 5 0 , i s e c / n
s C h e c k C 7
Check signal at
1C7(1) Set scope
N"O"
c m
S n o u l d
b e
sweep to 5 (isec/ —
s i m i l a r t 0
g*
cm. Should be
Y
E S
^iir
similar to 0
[ _ Check Q9&
assoc. circuitry
check
dc voltage at
_
IC7(3). Should
be 12.5 to 14V.
YES
L
Check signal
a t I C 6 ( 6 ) | « | ~
I—Replace IC6
NO
— |
Check C l l ; check
YES dc voltage at
—
IC10(3)
.Check Q8, CR20 &
a s s o c . compon.
YES
Check signal
atQ6(C). Set
scope sweep t o -
50 ^ s e c / c m .
Similar t o ^ j ^
r
YES
NO
L
Remove dc
power & check
Check signal
dc resistance
continuity between -OK between IC5(6)—
IC5(5) & IC2(1)
& ground;
should be approx
1.5KQ to 2KO.
■g- Check R44, C13
YE
JL Replace IC10
Check CR28;
!
Remove IC11 &
NO check resistance
—|
between Pin 9 &
1 for short.
Troubleshoot
i— 9. IV supply
N
P (C5.CR7, R14)
— I
YES
t— Replace IC3
Troubleshoot
NO
"" 13- 3V supply
—-|
(C9,CR14,R30)
YES
1
—Replace IC7
OK
Replace IC10
p—Replace IC11
SHORT
OK
YES
l_
-Replace IC5
Replace IC5
Check signal
a t I C 3 ( 6 ) . J k '
NO
Check dc voltage at
IC3(4,8). Check
R17 & c o n t i n u i t y - O K - Replace IC3
between IC3 &
IC4
YES
l _ Check Q6, CR8 &
assoc. compon.
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