Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement page 4

REVISION A CHANGE 1
WJ-8718A/MFP INSTRUCTION MANUAL
FIELD MODiFICATIONS INSTRUCTIONS
FOR INSTALLING THE MFP OPTION
IN A WJ-8718A HF RECEIVER
The following tools are necessary to perform the modification steps:
Phillips screwdriver
Soldering gun and solder
Perform the following steps to install the Microprocessor Front Panel (MFP) option
in the WJ-8718A HF Receiver.
1.
Remove power from the unit.
2. Remove top and bottom covers from the unit.
3. Remove six screws mounting the manual front panel to the unit.
Oisconnect all cable assemblies from the old manual front panel
except AIOPI. Disconnect AI0Pl from the Front Panel
Interconnect board A6A2. Remove manual front panel from the
unit.
4.
Place the unit with the bottom side facing up.
NOTE
El thru E59 are adjacent to the double row of
capacitors CI thru C58 depicted in Figure 6-14's
side view of the board. TerminalsEI thru E29
are located on the right side of the double row of
capacitors (looking from the front of the unit
with the unit flipped over). Terminals E30 thru
E58 are located on the left side. El, E29, E30,
and E58 are labeled on the board.
5. Check the Synthesizer Motherboard (A5) Type number 791570
revision level stamped on the bottom of the board. For AS boards
having revision level E or earlier, perform the following
modification to install MFP BITE. Refer to the WJ-8718A HF
Receiver Instruction manual.
a. Find A5 location by referring to Figure 5-8.
b. Referring to Figure 6-14, install JWl by wire wrapping one
end of a wire to XAIB, pin B9 (labeled as TP5). Solder the
opposite end to terminal £36. To locate £36, find E30 and
count down six more terminals.
A-CI-2