Realistic HTX-100 - Troubleshooting Hints; Transmitter Section Troubleshooting

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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