Watkins-Johnson Company WJ-8711A, Installation, Operation And Maintenance Manual

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WJ-8711A DIGITAL HF RECEIVER LOCAL OPERATION
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3.9 RUNNING THE BUILT-IN-TEST FUNCTION (BITE)
The built-in-test function (BITE) provides the operator the capability of testing the internal
circuitry of the receiver. A passed BITE test provides confidence that the receiver is performing normally.
To start BITE, first press the SPECIAL FUNCTION key until the message "BITE PENDING"
is shown in the upper Auxiliary Parameter display. Then turn the Auxiliary Parameter edit knob in either
direction; all LEDs are lit while BITE is being run.
The BITE result takes the form of a decimal number, equivalent to a 16-bit binary number.
Sixteen tests are performed during the BITE routine. A failed test sets its corresponding bit in a 16-bit register
table. The tests and their corresponding bits of the register table are listed in
Table 3-2 .
Table 3-2. BITE Error Codes
Bit
Decimal
Value Error Indication
0
(LSB)
1 Transmit Error - the control to DSP transmit pipeline is not empty.
1 2 Host Download Unsuccessful - the host microprocessor could not download the
operating program.
2 4
EPROM Download Unsuccessful
- the download to EPROM could not be
completed.
3 8
Host Command Not Acknowledged
- the DSP processor could not acknowledge
the start-up command from the host microprocessor.
4 16
No Response Back From the Host Processor - the DSP processor did not receive
a response back from the host microprocessor.
5 32 DSP Memory Check Not Completed - the check of the DSP processor's internal
memory could not be completed.
6 64 DSP EPROM Failure - the DSP processor's internal EPROM could not be
accessed.
7 128
DSP SRAM Failure
- the DSP processor's internal static RAM could not be
accessed.
8 257
RF Test Failed - the RF front end is not functioning properly.
9 512
Host A/D Failure
- the host microprocessor's internal analog-to-digital converter is
not functioning properly.
10 1024
Non-SSB Audio Failure - the AM, FM, CW demodulated audio path not
functioning properly.
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