Realistic HTX-100 - PLL Section Troubleshooting

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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