Magnum
257
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PLL Alignment
Caution:
Do not touch the "4.5MHz Osc" by hand to prevent malfunction.
In case malfunction make CON 401 short circuit after power off.
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Set
the Radio to adjust as below : Vol on, clarifier center, RF gain max, SQ min, Mode AM, NB & SCAN off, Band A, Channel 1, Mic gain min, Power gain max, Echo delay min, AMT min, RB off Power on at 13.8V DC |
1. DC power
2. Put Freq. counter (lead) on TP2 (Q42. Collector) and then Adjust as below.
3. Put the
lead of frequency counter on TP4 (pin 7. IC3) at RX mode.
4. Fix T14
with parapin wax. 5. Adjust current
of final Transistor at no modulation of SSB TX.
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Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.