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MAINTEN ANCE
WJ-8718A/MFP
4.1.1.3
Remote Interface Test Procedure
The information in this paragraph applies only to MFP Option equipped receivers
which are also equipped with an optional remote interface (232M or 488M). The interface can
be tested by following the test procedures in the WJ-8718 Series HF Receiver Instruction
Manual, supplemented with the guidelines listed below.
It
is assumed that the receiver has been
tested in the manual mode and found to be operational, that the appropriate remote control
equipment has been properly connected to the receiver under test, and that the switches in the
remote interface board have been configured as required by the conditions of remote operation
(reference paragraph 2.4.2, for 232M operation; or paragraph 2.4.3 for 488M operation).
1.
Energize the receiver under test and depress the front panel
REM OTE button.
2.
Use remote control command instructions (paragraph 2.4.5) to estab-
lish the receiver parameters listed in the test procedure.
3.
Proceed to carry out the test procedure instructions, using remote
commands to change the receiver parameters as required during the
test.
If test results are satisfactory, the receiver is responding
properly to the remote commands.
If a problem becomes evident
during a performance test procedure, refer to the troubleshooting
section of the WJ-8718 Series HF Receiver Instruction Manual and to
paragraph 4.1.3 of this supplement.
4.
Initiate monitor operations and verify that the monitored data
corresponds to the most recently commanded parameters.
NOTE
When the receiver under test is in any side-
band mode (ISB, LSB, or USB), the sideband
filter is automatically selected and the IF
bandwidth is approximately 3 kHz.
To indi-
cate this, the 3.2 kHz IF bandwidth is auto-
matically displayed.
5.
Verify that the receiver status can be monitored with the front panel
LOCAL pushbutton engaged.
4.1.2
4.1.2.1
ALIGNMENT PROCEDURES
Variable Voltage (VR) Adjustment (MFP-AIA2)
Adjustable potentiometer R2 on the Front Panel Switchboard, external to voltage
regulator Ul, is adjusted to set the level of the variable voltage output (VR) at J2. The input to
Ul is an unregulated 10 V.
The VR output should be approximately 7 Vdc. The VR voltage
drives TTL logic circuits (LED anode drivers) on the Front Panel Encode Board.
If
VR is too
high, the drivers will overheat and some display segments may not illuminate.
If
this problem
4-6
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