Symptom: Bright Display Without Characters - Agilent Technologies PSG Series Service Manual

Troubleshooting
Getting Started with Troubleshooting

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
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.
Table 1-6
P11-4 VLCD
P11-6 LCD_ENABLE_H
P11-9, 10, 12, 13, 15, 16, 18,
19, 21, 22, 24, 25, 27, 28, 30,
31, 33, 36, 37, 39, 40
Figure 1-1
1-10
1-17. If the green LED is lit and the display is still too bright, try
Signal
approx. 21 Vdc
>3 Vdc
Refer to Pulsing Activity in
1-1.
State
Figure