Technics SJ-MD100 - Page 12

SJ-MD100
– 12 –
Is output
voltage of IC1 pin 37
(TP35) approx.
1.3 V *1
Is voltage
on both sides of R5
at least 0.025 V?
1
NO
YES
NO
YES
Faulty optical pickup
Is there
output from IC3
pin 92?
Is voltage of
IC1 pin 2 (left side of R8)
approx. 1.8 V?
*1
Is voltage
on both sides of R5
at least 0 V?
Is voltage
of IC1 pin 36
2.6 V? *1
YES
Is current
flowing equal to at
least 1.2 times value
indicated on pick
FPC? *2
2
YES
NO
Is output of
IC3 pin 92 OK?
Is voltage of
IC1 pin 2 (left side of R8)
approx. 1.9 V?
*1
NO
YES
NO
YES
NO
YES
3.3V
0V
3.3V
0V
NO
YES
NO
YES
*2: Indicated value:
Current equal to that on both
sides of R5 divided by 1 ≠
Faulty IC1
Is voltage
of IC9 pin 3
2.6 V?
YES
Faulty L5
Faulty IC9
NO
NO
Faulty IC3
Faulty IC1
Faulty optical pickup
See Service Manual page 27
for measurements of IC1.
*1:
Faulty Q1
Faulty optical pickup
Faulty IC1
Faulty IC3
Faulty optical pickup