Products > Test Equipment
Rohde & Schwarz CMU200
arno:
Hello everybody,
I bought a used CMU200 two weeks ago. Everything worked fine until yesterday. Unplugged it from mains in the morning, replugged in the afternoon, fans came up for a couple of seconds, the power LEDs were still green, not orange. I am also able to go into standby by pressing the power button for a couple of seconds, but after re-powering the fans come up for a few seconds, then turn off. I already took of the case and all LEDs on the bottom of the mainboard light up after turning the unit on, but then go off. To my understanding the issue must be somewhere else but the PSU.
Thanks in advance,
Arno
dencyaupin:
Hello everybody! Help with troubleshooting and identify mixer board details.
_Wim_:
--- Quote from: arno on June 29, 2021, 07:20:15 am ---Hello everybody,
I bought a used CMU200 two weeks ago. Everything worked fine until yesterday. Unplugged it from mains in the morning, replugged in the afternoon, fans came up for a couple of seconds, the power LEDs were still green, not orange. I am also able to go into standby by pressing the power button for a couple of seconds, but after re-powering the fans come up for a few seconds, then turn off. I already took of the case and all LEDs on the bottom of the mainboard light up after turning the unit on, but then go off. To my understanding the issue must be somewhere else but the PSU.
Thanks in advance,
Arno
--- End quote ---
Maybe also a keyboard related issue?
https://www.eevblog.com/forum/repair/cmu200-boot-failure-power-suplly-erratic/msg1193017/#msg1193017
arno:
Dear Wim,
thank you for the hint. As far as I could investigate, the keyboard is not the cause.
Arno
_Wim_:
According to your symptoms it does indeed seem a short circuit is present somewhere. So first thing to do it find the faulty module.
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