Realistic HTX-100 Service Manual page 18

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.
-17-