Agilent Technologies N5230A Service Manual page 85

PNA Series Microwave Network Analyzers
N5230A
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 4-15. If all of these signals measure correctly, suspect a defective backlight or LCD.
The backlight is the most probable cause.
Be careful not to short connector pins together when measuring these signals.
CAUTION
Table 4-4 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
Service Guide N5230-90014
Test Point
J2 pin 3
J2 pin 4
J2 pin 27
7-10.
Table 4-4 and illustrated in
Voltage
0 to +3 V
0 to +3 V
0 to +3.4 V pk-to-pk
Troubleshooting
Power Up Troubleshooting
Figure 4-6
Signal
30.8 kHz square wave
60 Hz square wave
25 MHz sine wave
7-10.
"Removing
4-15