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TROUBLESHOOTING/LEVEL DIAGRAM
3. PLL SYSTEM
I
No receiver output.
V
' VFO is inoperative, or pin-3 system in the PD Unit is
defective.
1
VCO-OFF circuit in operation. (Normally 0.1V or less).
CAR does not oscillate, or CAR signal not reaching the PD
Unit.
Defective connector contact in the PLL Unit.
HET signal not reaching the PD Unit.
(
VFO frequency not changing. A
(VCO output is available.)
/
Oscillation level insufficient for each band.
Defective 1C (a'18 ~ Q20) in the VCO Unit.
Defective vari-cap in the VCO Unit.
Defective DC 5V supply (defective zener.)
VCO requires alignment.
Ol RFAmp
02 Buff
8.830MHz-
IF-Aunlf (X48-II90-00)
Ring 0«t.
4 5 5 K H z -
Ol(Mlx)
RF unit (X44 -!24O).CoilPack unit(X44-l230-OOJ
44 dB
NOTES:
1) The above figure a curve formed by plotting the signal
generator output required for a constant audio output
wah d uuiibidiu AF yain uunuul selling. Sei me AF gain
control for a 0.63V/8Q (50 mW) audio output for a 0 dB
signal generator input at 14.250 MHz.
2) Measure the AF output at'the ring detector on the IF B
unit (X48-1200-00).
84
71
103
3) All voltage measurement are read from on RF VTVM.
4) To measure the output of signal generator, contact a
o.o i^F QUUVVV capacitor between the signal generator
and the check point.
50
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