Powersupply - Panasonic KX-P1180 Service Manual

KX-P1180
Power supply
problem
Check AC voltage out-
put at connector CN1.
+30VDC
Check diode
D1~D4.
®
voltage is not
output?
Are
D1~D4
normal?
YES
Observe the waveform
at power ON from
CT (pin 5), E(pin 10),
and Vref (pin 14) of
IC1.
Is
CT
oscillating?
ts the
E
waveform
NO
NO
Observe the waveform
at power ON from
the collector of Q2.
Is the
waveform
normal?
YES
NO
Check resistance val-
ues of transformer
coils
+5VDC Replace
the transformer.
Do YES
coils
open?
NO
Check if fuse or coil on
primary board is
opened.
Replace defective
Diode.
Are
fuse and
coil OK?
NO | Replace
the fuse or coil.
YES
1Vidiv
IC1 &) Voltage Waveform 10usec/div
5V/div
Replace !C1.
IC1 (0) Voltage Waveform 10,sec/div
10V/div
Replace Q1.
8-26
Q2 Collector Voitage Waveform 10ysec/div
ete.