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5. If all of the power supply indicators along the outside edge of the A2 controller assembly
are lit, the A6 power supply is probably working properly.
I
FRONT VIEW
I
I
I
;
+15v
-12.6V;
I
I
-----------------~
SK1122
Figure 13-3. Probe Power Socket
6. Press
FREQUENCY
, 1,
IGHz).
7. Allow the spectrum analyzer to warm up for at least 1 minute.
8. While observing the display, set the (LINE) switch off. If a green flash appears on the
display, the CRT is probably working properly; troubleshoot either the A2 controller or the
Al7 CRT driver.
9. If a flash does not occur on the display, the A2 controller,
A6Al
HV module, Al7 CRT
driver, or
A18Vl
CRT might be at fault.
Blanking Signal
1. Connect an oscilloscope probe to A2J202 pin 3. Connect the oscilloscope ground lead to
TP3. Set the oscilloscope to the following settings:
Sweep time
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.2
ms/div
Vertical scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . , . . . . . . . . , . . . . .
1
V/div
2. If a 4 Vp-p signal is not observed, the A2 controller assembly is faulty.
3. Repeat steps 1 and 2 with the oscilloscope probe on A2J202 pin 14.
4. Set the oscilloscope to the following settings:
Sweep time
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lps/div
Vertical scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
V/div
5. Connect the positive probe lead to A2J202 pin 15. This is the blanking output.
Display/Power Supply Section 13-7