NEC NMV 1700V Service Manual page 27

a
Is the output waveform which is the
same as I006 pin 9, 22 being
inputted to I007 pin 1,9?
NG
1) Printed wire broke between I006 pin 9, 22 and I007 pin 1, 9.
2) C015, C018 open.
OK
3) C015, C018 failure.
4) R051, R052 open.
5) R051, R052 failure.
Is the input waveform amplified by
I007 being outputted?
Failure point
NG
OK
I007 failure.
Is the output waveform of I007 pin
4,6 being inputted to P012 pin 2, 3?
NG
OK
Failure point
1) Speaker cable disconnection.
2) Speaker failure.
Page 16
Failure point
1) Printed wire broke between I007 pin 4, 6 and P012 pin 2, 3.
2) C016, C017 open.
3) C016, C017 failure.
b
Is the "H" signal of the TTL level
being inputted to I008 pin 1?
Is the "H" signal of the TTL level
NG
being outputted from I306 pin 17?
Proceed section 11 "Checking the
NG
OK
OK
Failure point
Printed wire broke between I306 pin
17 and I008 pin 1.
Failure point
1) C039 short.
2) I008 failure.
Failure point
NMV 1700V
operation of CPU".
Trouble Shooting