Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement page 6

REVISION A CHANGE 1 WJ-8718A/MFP INSTRUCTION MANUAL
794275. Install the new circuit card into slots X7 and X8 on the
A6 board. Refer to Figure 5-33 in the WJ-8718A HF Receiver
Instruction Manual.
12. Remove the Front Panel Interconnect (A6A2) from slots Xl and
X2 of the I/O Motherboard (A6). Replace with the IF Interface
(MFP-A3) type number 794308 and cable MFP-W2. Install the new
circuit card into slots Xl and X2 on the A6 board. Refer to
Figure 5-33 of the WJ-8718A HF Receiver Instruction Manual.
13. Referring to Figure 5-8, perform the following steps to connect
the ground lines for the new microprocessor front panel.
a. Solder one end of the MFP-PI3 cable to the ground terminal
C12 on the chassis.
b. Solder one end of the MFP-P12 to the ground terminal Cll on
the chassis.
c. Screw the ground lug of MFP-Pll onto the chassis
14. Install the new microprocessor front panel by connecting the
following cable. assemblies.
a. Connect MFP-P21 to the front panel connector AIAIJ2.
b. Connect MFP-Pl (contains 16 sockets) to the front panel
connector AIJ2. Notice the brown dot at one end of the
MFP-Pl connector. This brown dot indicates the location of
pin 1 on the connector. Ensure that pin 1 of connector
MFP-Pl is connected to pin 1 of AIJ2.
c. Connect MFP-P2 (contains 14 sockets) to the front panel
connector A1J!. Notice the red dot at one end of the
MFP-P2 connector. This red dot indicates the location of the
. pin 1 of the connector. Ensure that pin 1 of connector
. MFP-P2 is connected to pin 1 of AIJI.
d. Connect MFP-P6 to the front panel connector AIAIJ1. The
red dot on MFP-P6 indicates the location of pin 1. Ensure
that pin 1 of MFP-P6 is connected to pin 1 of AIAIJ1.
e. Connect the Line Audio cable from the IF Motherboard (A4)
to the line audio potentiometer on the front panel.
15. Install the new microprocessor front panel in place and mount
using the same six screws removed in step 3.
16. Replace top and bottom covers using the
s~me
screws removed in
step 2.
A-CI-4