R&S ZVA8 - Troubleshooting - Power-Up Problems

Repairs R&S ZVA
1177.5333.02 3.80 E-11
Troubleshooting - Power-up Problems
 Fault: It is not possible to turn on the ZVA.
Action
Cause of fault / remedy
Check mains switch on the rear panel

Mains switch OFF: Turn on at mains switch.
Check LED is yellow (standby)

LED does not come on:
 Measure voltage at X92.C23
(Front module controller):
Nom. value: +13.5 V  1V
Nom. value reached: Fault in key pad or controller.
No voltage:
Power supply defective or short to12 V standby.
Turn on instrument. Check LED is green

LED does not come on:
 Measure the PWR-ON signal at power supply
X92.B24:
< 1V for ON
Voltage > 1V: Key pad or controller defective.
 Fault: Fan not working.
Action
Cause of fault / remedy
Check voltage at connector:
X35, X36, X37 pin 3: nom. value 12V

If no voltage can be measured the fan fuse may be
defective (F12, F62, F63)
Select Service Function
Set Service Level 1
Set Service Function 2.5.0.11.1.5
(max. fan speed)
Check voltage at connector:
X35, X36, X37 pin 3: nom. value 0.9V