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5-131.
Procedure
5-132.
Power On
1.
Check that the AC input power select card is in the 120 V postion. Connect the Unit Under Test (UUT)
to a 120 VAC line source with the front pal)el power switch off. Verify the presence of an AC indication
on the front panel.
2.
Set the power switch to the Standby Position. Verify the oven ready indicator is on.
3.
Set the power switch to the on position. Verify that after a warm-up period a display is visible on the
CRT.
5-133.
Keyboard Check
1.
Verify that each key has the proper effect by observing the Gen/Mon Mtr Display and entering the
frequency 123.4567 MHz and the PL frequency 890. Check for proper cursor key operation.
2.
Verify that the up and down display keys perform properly and that the LED at each display illuminates.
3.
Verify that the up and down function keys perform properly and, that the LED at each function
illuminates.
4.
Verify that the up and down modulation keys perform properly and that the LED at each modulation
mode illuminates.
5-134.
Nonvolatile Memory
1.
Select some random combination of Display, Function, and Modulation Modes. Simultaneously
depress both cursor keys and after a five second delay turn the system power OFF. Turn the system
power back ON and verify that the same Display, Function, and Modulation Modes are present.
5-135.
Modulation Capability
1.
Set the UUT to the Generate FM Mode and select the Gen/Mon Mtr Display. On the Gen/Mon Mtr
Display enter a DPL code of 111. Select the Oscilloscope Display and connect the Mod Out Jack to the
Vert In Jack. Set the code synthesizer to the Cont PL/DPL Mode. On the scope verify the presence of a
DPL waveform whose amplitude is variable with the code synthesizer level control.
2.
Move the Modulation Switch from CONT to OFF and verify that a short burst of 133Hz is output before
the output stops.
3.
Move the Modulation Switch to the BURST position. Verify that a 133Hz tone is output as long as the
switch is held in the BURST position.
4.
Select the Tone A Continuous Mode. Verify a Tone A output on the scope and at the speaker.
5.
Select the Tone Remote Mode. Verify that when the Modulation Switch is moved from OFF to BURST
that a single Tone Remote Access Sequence is generated.
6.
Connect a microphone to the Mic Jack. Turn up the Ext Level Control and verify that speaking into the
mike causes a modulation signat to be output as observed on the scope display.
5-33
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