Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement page 5

WJ-8718A/MFP INSTRUCTION MANUAL
REVISION A CHANGE I
c. Referring to Pigure 6-14, install JW2 by wire wrapping one
end of a wire to XA2A, pin A55 (labeled
as
TP8). Solder the
opposite end to terminal E57. To locate E57, locate E58 and
count in one terminal.
d. Referring to Figure 6-14, install JW3 by wire wrapping one
end of a wire to XA3, pin A7 (labeled as TP 15). Solder the
opposite end to terminal E34. To find E34, locate E30 and
count four more terminals.
6. Check the IF Motherboard (A4) Type number 791569 revision level
stamped on board. For boards having revision level G or later,
reposition jumper plug JPl at J3 for AGC Dump. For boards
having earlier revision levels, perform the following modification
to install AGC Dump. Refer to the WJ-8718A HF Receiver
Instruction Manual.
a. Referring to Figure 5-8, locate A4 assembly.
b. Referring to Figure 6-3, install a wire by wire wrapping one
end of it to XA6, pin 18. Solder the opposite end to E5. See
the pin labels at XAI and XAll for guide to XA6 pin
locations.
7. Refer to Figure 5-8 for A6 location. Check the I/O Motherboard
(A6) Type number 791580 revision level. For boards having
revision level M or later, reposition jumper plug A6JPl from X8
pin 3 to X7 pin 59. For boards having earlier revision levels,
perform the following modification to configure the board for use
with the MFP options. Refer to Figures 5-8 and 6-20 in the
WJ-8718A HF Receiver Instruction Manual.
a. Connect E9 of the main chassis (Pigure 5-8) to A6X7-59
(Figure 6-20).
8. Route the MFP-Wl cable through one of the cutouts in the chassis
of the unit. Notice the red dot at one end of the MFP-XA3
connector. This red dot indicates the location of pin 1 on the
connector. Connect MFP-XA3 to XA5 on the I/O Motherboard
(A6). Refer to Plgure 6-20. Ensure that pin 1 of connector
MPP-XA3 is connected to pin 1 of XA5.
9. Place the unit with the top side facing up.
10. Remove- the AGC Amplifier (A4A6) type number 78112 from slot
A6 on the IF Motherboard (A4). Replace with the AGC Amplifier
(MFP-A5) type number 796175. Install the new circuit card into
slot A6 on the A4 board. Refer to Figure 5-1 in the WJ-8718A HF
Receiver Instruction Manual.
11. Remove the Manual Tuning Up/Down Counter (A6Al) type number
791515 from slots X7 and X8 of the I/O Motherboard (A6).
A-CI-3