Rohde & Schwarz CMU 200 Service Manual

Troubleshooting R&S CMU
1100.4903.82 3.74 E-5
Troubleshooting using the LEDs (H1 to H8) on the MOTHERBOARD
• Fault: R&S CMU cannot be switched on.
Mains outlet, mains
cable and all switches in
t
he circuit of the mains
o
utlet are under voltage?
Mains cable plugged in
at CMU POWER
SUPPLY?
Mains switch at rear of
CMU POWER SUPPLY in
position 1?
Orange LED (standby
voltage) at CMU front
illuminated?
STANDBY/ON key
pressed and green
LED (+5.2 V operating voltage)
illuminated below the front
of the CMU?
Yes
Yes
Yes
Yes
Provide appropriate
A
C supply voltage!
Plug in mains cable!
Set mains switch to
position 1!
No
LED H7 (+12 V
STANDBY) at bottom
of MOTHERBOARD1
illuminated?
LCD or hard disk or
FRONT MODULE
CONTROLLER in FRONT
MODULE faulty!
POWER SUPPLY
faulty or short-circuit of
this voltage circuit!
POWER SUPPLY
faulty or short-circuit of
this voltage circuit!
Lithium battery in FRONT MODULE flat!
Keyboard membrane or FRONT
MODULE CONTROLLER in FRONT
MODULE faulty!
No
No
Yes
LED H1 (+5.2 V operating
voltage) at bottom
of MOTHERBOARD1
illuminated?
No
No
No
No
Yes
Yes

Rohde & Schwarz CMU 200 Specifications

General

Brand	Rohde & Schwarz
Model	CMU 200
Category	Test Equipment
Language	English