Realistic HTX-100 - Receiver Section Troubleshooting

RECEIVER SECTION
I No reception. I
OK
Check the speaker and
the wire connection.
OK
Check voltage at
pin7 of IC5.
NG
NG
Replace defective parts
and/ or poor soldering.
Check voltage at
base of 039.
i OK
NG
.
OK
* See microprocessor section.
Check voltage at pin 1
of IC5.
OK
Check voltage of 027,
031.
OK
Check if the SO
control operates
normally.
OK
NG
NG
NG
.
Replace defective parts.
Replace defective parts .
Check voltage at
pin5 of IC1.
NG
Check if the voltage level is 1 Vp-p · NG
and frequency is 1 0.695MHz (CW)
Check
voltage of
023.
and 1 0.6965MHz (SSB) at TP3. ·
OK
NG
NG
Replace defective
parts.
Replace
defective
parts and/ or readjust
sa control.
Replace defective
crystal (X1 ).
Check voltage of 0 13 ....... 18 .
I
Replace defective parts.
I I
OK
Rx section is not defective.
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