Troubleshooting R&S SMU200A
1007.9845.82 3.16 E-6
Action Possible error causes and further steps
Switch on instrument. Check green LED
LED remains unlit, power supply doesn’t start:
Check signal PS_ONOFF at test point on
underside of mainboard (near to rear panel):
Rated value: < 1 V for ON.
Voltage < 1 V: power supply defective.
Check signal FMR_ONOFF (connector X161. A2)
from controller
V: Either FMR (front module controller) or
keyboard defective. To check, short-
circuit X161.A2 to ground. If power
supply starts, check these modules.
V: Check signal PS_ONOFF at DACIF
connector (X161, B2):
Voltage > 1 V: Temperature sensor on DACIF defective.
To check, short-circuit X161.B2 to
ground. If power supply starts, check this
module.
Voltage < 1 V: Fault in motherboard temperature
monitors (or
simply temperature too high,
>47 degrees). Check temperature
monitors on motherboard.
Check for defektive keyboard or front module
controller
Open front module, short-circuit jumper X21
(approx. 2 cm from top and approx. 4 cm from right
on board):
If power supply starts now:
Keyboard defective or not
connected correctly.
Power supply still does not start:
FMR (front module controller) defective.
Power supply starts, screen remains dark
Measure voltages on motherboard, see below "Short-
circuit of one or more operating voltages".
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