Hi all,
This question is more to fulfill my curiosity, but maybe it has to
do with the problem I'm experiencing with the PPL reference oscillator in
the synthesiser section.
While trying to debug why I was getting a reading of 190.00 -/+
2KHz in the TP3 PLL reference oscillator test point, I decided to do some
voltage checks. I discovered that pin 2 of U5 on the RF board wasn't
getting the 5V I was expecting according to the voltage tables. I traced
this all the way back to the control board, U6 pin 24. the voltage
reading was 0V, so thinking this is a digital output, I hooked-up a logic
probe and confirmed the voltage reading. I conirmed this same reading at
pin 5 (SD0) of U4 on the RF board.
Now, U5 on the RF board shows 4.06V on pin 7 so maybe this is OK
and I'm just making myself worry over a red herring...but I thought I'd
ask.
On a lark, I took the boards apart and powered up the control
board alone. First time, pin 24 showed the correct voltage. On second
power-up, still outside the RF board, the pin showed 0V....maybe normal
behaviour?
Anyways, I'm still looking through the RF board (redid RFC14 - one
winding too many - and re-seated the thermister board) until I can find
where my PLL ref problem lies.
Thanks,
Will
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