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2. All of the power-supply indicator
LEDs
along the edge of the A2 controller assembly
should be lit.
3. The rear-panel CRT
+llO
VDC ON indicator should also be lit.
4. Connect the TAM probe cable to
A2Jll.
5.
Press
(m),
SOFT KEY
t3,
a,
SOFT KEY
#I.
(The top soft key is
#l.)
6. The yellow LED next to
A2Jll
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
KKY
ti
and wait 5 seconds.
8.
Press SOFT KEY
t4
. The results should be sent to the printer.
9.
Move the probe cable to A2J201, press
SQFT
KEY
#I
and wait 5 seconds.
16.
Press
SaFT
KEY 84 . 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
t3
, then SOFT
KEY
#4,
and when the printout is complete,
SOFT KEY
t6.
12. If no failures were indicated in testing the A2 controller, move the probe cable to A17J4.
13.
Press SOFT KEY
#i
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 in
“High Voltage Supplies” in this chapter.
Blank Display
1. If the LED above the front-panel LINE switch is lit, most of the A6 power supply is
functioning properly.
2. Carefully check the voltages on the front-panel PROBE POWER jack. Be careful to avoid
shorting the pins together. See Figure 13-3.
3. Check that the fan is operating. If the PROBE POWER voltages are correct, and the fan
is turning, the A6 power supply is probably working properly.
4. If the rear-panel CRT
+llO
VDC ON LED is lit, the high-voltage supplies should also be
operating. (The high-voltage supplies will be turned off if the HV-SHUT-DOWN line is
low.) The A6 power supply feeds
+5
V to the A2 controller through
Wl.
The A2 assembly
distributes this
+5
V to the Al7 CRT driver through W7. Al7 sends
+5
V back to A6 as
the HV-SHUT-DOWN signal on W8. As a result, A2, A17,
Wl,
W7, and W8 must all be
in place for the high-voltage supplies to operate.
13-6 Display/Power Supply Section