Troubleshooting
Getting Started with Troubleshooting
1-10
Symptom: Bright Display Without Characters
Ensure that the signal generator is powered-on and the front panel green LED is on. If the green LED is not
on refer to “Power Supplies” on page 1-17. If the green LED is lit and the display is still too bright, try
adjusting the contrast controls on the front panel. If adjusting the contrast controls has no effect, check the
connection of the ribbon cable at J9 of the A3 Power Switch.
If the A2 Display is still too bright, use an oscilloscope to check P11 of the A31 Motherboard for the signals in
Table1-6.
Figure 1-1
Table 1-6
Signal State
P11-4 VLCD approx. 21 Vdc
P11-6 LCD_ENABLE_H >3 Vdc
P11-9, 10, 12, 13, 15, 16, 18,
19, 21, 22, 24, 25, 27, 28, 30,
31, 33, 36, 37, 39, 40
Refer to Pulsing Activity in Figure
1-1.
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