Realistic HTX-100 Service Manual page 19

PLL SECTION
'
No good.
Check if the LCD displays
NG
microprocessor section check.
normally.
*
See
OK
frequency is
Check if the
NG
Replace defective 0305
10.24MHz at emitter of
and/or X301.
0305.
OK
Check if the voltage is
Check if the
NG
NG
NG
0.4Vp-p and frequency is
Check. voltage
Replace
voltage is GV
~ 1 0.4965MHz (SSB)
and
__..
~
at TP301.
1 0.495MHz (CW)
at
of 0301-304. defective parts.
TP302.
J
OK +OK
Check voltage of IC303,
NG
OK
IC302.
Replace defective parts.
OK
,,
Check voltage of IC305.
NG
Replace defective parts.
OK
Check if the voltage NG
Check if the voltage
NG NG
Replace
of TP303 is 5.5V at
_..
is 120mVp-p and
___..
Check voltage
~ defective 0309
29.6999MHz and 3V frequency is 22MHz
of 0309.
at 28.000MHz. at TP307.
and/ or X302.
OK I
OK
+
,
Check if the voltage is
NG
Check voltage
NG
Replace
120mVp-p and frequency is
of IC306 and
defective parts.
17.6965MHz at TP305.
0306, 0307.
OK
+OK
NG
Check voltage of 0307.
.
Replace defective parts.
OK
I
,,
Check if the frequency is
NG NG
28.000MHz""29.6999MHz .
~
Check voltage of 0308.
~
Replace defective parts.
• OK
OK
I
Check if connection of J301 is OK.
Replace defective L318 and/or L319.
I
• OK
PLL section is not defective.
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