Agilent Technologies PNA Series Service Manual page 96

Troubleshooting
Power Up Troubleshooting
Verifying the A3 Front Panel Interface Board
To verify that the HSYNC (horizontal sync), VSYNC (vertical sync), and LCD clock are
functioning correctly, measure the signals listed in
on page 4-16. If all of these signals measure correctly, suspect a defective backlight or LCD.
The backlight is the most probable cause.
CAUTION Be careful not to short connector pins together when measuring these signals.
Table 4-5 A3 Front Panel Interface Board, Voltages and Signals
Signal Type
HSYNC
VSYNC
CLOCK
Figure 4-6 Verifying HSYNC, VSYNC, and LCD Clock
If any of the three signal types is incorrect, replace the A3 front panel interface board.
Refer to "Removing the A3 Front Panel Interface Board" on page
If all of the signal types are correct, replace the A2 display assembly. Refer to
the A2 Display Assembly" on page
4-16
Test Point
J2 pin 3
J2 pin 4
J2 pin 27
7-12.
PNA Series Microwave Network Analyzers
Table 4-5 and illustrated in
Voltage
0 to +3 V
0 to +3 V
0 to +3.4 V pk-to-pk
E8361A
Figure 4-6
Signal
30.8 kHz square wave
60 Hz square wave
25 MHz sine wave
7-12.
"Removing
Service Guide E8361-90001