[ICOM] IC-756 Pro question

[Stephen Budensiek]

Hello guys,
   Don't know how many there are on the reflector that work at board
component level, but have a question for those that do.
   I have a IC-756 Pro that got messed up in a power surge when my
residence was being switched from an old 60 Amp Fuse box entrance to a
new 200 amp breaker box rewiring.   During the switch over, smoke
started coming out of the 756 (turned off), and a 20 amp breaker blew.
   The damage was mostly in the CIV and 7 pin Acc plug in the back
that went out to the computer soundboard and DB9 ports.   Burned up
the CIV converter cable, burnt the first transister for CIV in the
radio, got some traces around the 7 pin acc plug, got the audio IC
that feeds audio out to the 7 pin DIN.   Have everything working and
restored except for one problem.
    I initally had transmit on the 756 Pro, the analyser screen showed
signals OK, but had just lost receive and CIV.   About a week later,
the transmit and analyser quit (figure something got spike and finally
died, a common problem for this type of damage).   Traced the problem
back to the PLL board.   None of the DDS or PLL chips are programming.
  Replaced IC1, the chip that enabled the 7 DDS and PLL chips in turn
as programing data is sent on the common data line.   Fixed nothing,
found out today the output's are too short for my 60 mhz scope to see,
couldn't see them either on a working 756 I got access to.  The input
wavaeforms to IC1 are identical in the bad and good 756 Pro. The 32
mhz reference oscillator, and 64 mhz doubled signal outputs are
working fine (no DDS or PLL involved).  The 5.0 vdc and 8.0 vdc
voltages are good on the PLL board.   Anyone seen a problem like this?
  I've lost all PLL/DDS programming, with good data going to them.
Data coming from the main board CPU is OK.  Can't figure out what I'm
missing, it's probably something simple.   Don't know if there's a
more technical group somewhere that deals with the 756 Pro.

73's de Stephen, K0SD