628 Chapter12
Display/Power Supply Section
Troubleshooting Using the TAM
Blank Display (Using the TAM)
Use the following procedure if the instrument display is blank. This
procedure substitutes an HP-IB printer for the display.
1. Connect the printer to the HP 8560E spectrum analyzer and set the
printer address to the value required by the TAM. This is usually 1.
2. All of the power-supply indicator LEDs along the edge of the A2
controller assembly should be lit.
3. The rear panel CRT +110 VDC ON indicator should also be lit.
4. Connect the TAM probe cable to A2J11.
5. Press
MODULE, SOFT KEY #3, ▼, and SOFT KEY
#1. (The top soft key is #1.)
6. The yellow LED next to A2J11 should blink approximately ten
times. If the LED fails to blink correctly, troubleshoot the digital
section of the A2 controller assembly.
7. Move the probe cable to A2J202. Press SOFT KEY #1 and wait 5
seconds.
8. Press SOFT KEY #4. The results should be sent to the printer.
9. Move the probe cable to A2J201, press
SOFT KEY #1 and wait 5
seconds.
10.Press SOFT KEY #4. The results will be sent to the printer.
11.If a failure is indicated in any of these tests, the fault lies on the A2
controller assembly. to obtain more information:
a. Press the down arrow key one less time than the test number.
(For example, press it twice for the third test on the list.)
b. Press
SOFT KEY #3, then SOFT KEY #4, and when the printout is
complete,
SOFT KEY #6.
12.If no failures were indicated in testing the A2 controller, move the
probe cable to A17J4.
13.Press
SOFT KEY #1 and wait 5 seconds.
14.Press
SOFT KEY #4. The results will be sent to the printer.
15.If no failure is indicated in the printout, check the high-voltage
supplies as described "High Voltage Supplies" in this chapter.
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