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FIELD MODIFICATIONS INSTRUCTIONS
FOR INSTALLING THE 1-Hz OPTION IN
THE WJ-8718A OR IN THE WJ-8718A/MFP 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 1-Hz Option in the WJ-8718A or in the
WJ-8718A/MFP receiver:
1. Remove power from the unit.
2. Remove top and bottom covers from the unit.
3. For the WJ-8718A:
Remove the six screws mounting the manual front panel to the unit.
Disconnect all cable assemblies from the old manual front panel except
A10P1. Disconnect A10P1 from the Front Panel Interconnect board A6A2.
Remove the manual front panel from the unit.
For the WJ-8718A/MFP:
Remove the six screws mounting the stock MFP front panel to the unit.
Disconnect all cable assemblies from the old MFP front panel (MFP-P12
from MFP-P14, MFP-P13 from MFP-P15, MFP-P1 [16-pin] from J2, MFP-
P2 [14-pin] from J1). Disconnect also the MFP-P6 plug from the J1 socket
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on the Front Panel Encoder card A1- 796056-X, unplug that board from the
.
Front Panel Interconnect small motherboard (MFP-A1, 794310-X) and set it
apart temporarily.
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Remove the old MFP front panel from the unit.
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4. Place the unit with the bottom side facing up.
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NOTES
- The 1-Hz Option is normally Factory-installed together with the 10-Hz
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BFO Option, although this is not mandatory. It is recommended to have at
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hand and to read carefully also the 10-Hz Option Manual anyway.
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- For the WJ-8718A/MFP: before starting the 1-Hz Option installation,
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please check and ascertain that all the Field Modifications considered in the
"WJ-8718A/MFP INSTRUCTION MANUAL REVISION A CHANGE 1"-
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February 1991 have been already performed as described.
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- This manual can also be used for installing the 1-Hz Option on WJ-8716
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and WJ-8716/MFP receivers.
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5. Find A6 I/O MB (Type number 791580) location by referring to Figure
5-8 of the WJ-8718A HF Receiver Instruction Manual.
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