Troubleshooting Hints - Realistic HTX-100 Service Manual

TROUBLESHOOTING HINTS
Note: Refer to the transistor voltage chart and the IC voltage chart for the IC and transistor terminal vol-
tages.
TRANSMITTER SECTION
No transmission.
'
NG
Replace defective
Check PTT switch.
PTT switch.
f
OK
NG
Replace defective
Check microphone.
parts.
f
OK
Check microphone
NG
Replace defective
jack. parts.
f
OK
Check microprocessor circuit.
*
See microprocessor section.
l
OK
Check pins 7 and 8 of IC3
NG
Replace defective parts.
f
OK
Check voltage of 031,
NG
Replace defective parts.
029 and 027.
f
OK
Check voltage and
*
See PLL section.
frequency at TP2.
l
OK
NG
Replace antenna and
Check antenna.
antenna jack.
f
OK
Check antenna wire.
NG
I I
Resolder W511.
f
OK
I I
Check voltage of 0502,
NG
05.0 1, 033 and 034.
Replace defective parts.
f
OK
Check voltage of IC6, IC2,
NG
. .
Replace defective parts .
IC3.
f
OK
Check voltage and
NG
Check voltage of
NG
Replace defective
frequency at TP3. 023.
parts.
!
OK
NG
I
I
Check voltage of 024 and 025.
I
Replace defective parts.
t
OK
Tx section is not defective.
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