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MAINTENANCE
NOTE
The purpose of both diagnostic programs is for
ascertaining receiver readiness prior to oper-
ation, and for serving as a troubleshooting
starting point for the maintenance technician.
They are not intended for use on initial receipt
of equipment, to determine if a receiver is
defective and subject to return. That decision
rests with the maintenance technician, only
after examining the receiver for loose con-
nections and other probable causes for mal-
function.
WJ-8718A/MFP
4.1.1.1
BITE
Program
The BITE (Built-In Test Equipment) program is a diagnostic program which verifies
the operation of the front panel switches and LEDs and, in the process, verifies operation of the
microprocessor and the following microprocessor support circuits:
1.
The microprocessor bus lines ADO through AD7 and AS through A14.
2.
Microprocessor signals ALE, RD, and WR.
3.
The RAM ENABLE line and the EPROM devices on the Synthesizer
Interface (MFP- A4).
The receiver is placed in the BITE mode through the front panel keypad.
The
access procedure is outlined to provide a complete check of the front panel switches and LEDs.
In some situations, such as troubleshooting, the maintenance technician may prefer to validate
one or more selected switches. Once the BITE program mode has been established, the switches
can be verified in any order or number.
4.1.1.1.1
4-2
Access
To BITE
Program
1.
Energize the receiver under test and press the front panel LOCAL
key.
2.
Press three general purpose keypad buttons:
1,7, and
*
(special
function).
3.
All LEDs should be illuminated and all 7-segment displays (except the
BFO sign) should display the number eight.
4.
Refer to Table 4-2 and verify the operation of each Group 1 switch
on the front panel by pressing the key and noting the RC code
displayed in the 100 Hz (R) and 10 Hz (C) digits (OO.OOORC) of the
FREQUENCY/MHZ display.
The RC code is derived from the
position a switch occupies in the Y (row or R) and X (Column or C)
planes of the switch matrix.
Refer to paragraph 4.1.1.1.2 for a
detailed discussion of the RC code.
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