![Rohde & Schwarz ZVB 14 Service Manual Download Page 123](http://html.mh-extra.com/html/rohde-and-schwarz/zvb-14/zvb-14_service-manual_1477898123.webp)
R&S ZVB
Instrument Construction and Function Description
1145.1078.82 3.55
E-4
Troubleshooting - Power-up Problems
•
Fault: It is not possible to turn on the R&S ZVB.
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 12 V
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
Summary of Contents for ZVB 14
Page 4: ......
Page 10: ......
Page 56: ......
Page 58: ...Table of Contents Alignment R S ZVB 1145 1078 82 I 2 2 E 4 ...
Page 66: ......
Page 154: ...Table of Contents Software Update Installation of Options R S ZVB 1145 1078 82 I 4 2 E 4 ...
Page 158: ...5 2 ...
Page 160: ...1145 1078 82 5 2 E 4 Spare Parts List Mechanical Drawings ...
Page 173: ......
Page 174: ......
Page 175: ......
Page 176: ......
Page 177: ......
Page 178: ......
Page 179: ......
Page 180: ......
Page 181: ......
Page 182: ......
Page 183: ......
Page 184: ......
Page 185: ......
Page 186: ......
Page 187: ......
Page 188: ......
Page 189: ...1145 1078 82 5 19 E 4 Block Circuit Diagram ...
Page 190: ......
Page 191: ......
Page 192: ......
Page 193: ......
Page 194: ......
Page 195: ......
Page 196: ......
Page 197: ......
Page 198: ......