Electronics > Repair

Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply

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av500:
And now for the conclusion:

- repaired the PCB with UV cure solder mask, the UV lamp did not arrive but the sun was shinning  8)
- soldered the replacement caps
- put it all together for a dry run, 5.499V analog on the meter  :-+
- reassembled the PSU and back in the case, the FSEB is one happy camper again

mpcengineer:
Hi. Does anyone have the part numbers for the 9 way mating connector? Please.

I need to test my PSU.

Thanks

MPC

av500:
I bought this one: https://www.mouser.de/ProductDetail/TE-Connectivity/350712-1?qs=OHKvVYVKKrfVmRRZ4oQI7w%3D%3D

paul@yahrprobert.com:
For R&S boat anchors that don't boot up see this thread:
https://www.eevblog.com/forum/testgear/rohde-schwarz-fsae-30/msg3238578/#msg3238578

The problem was a dead resonator on a PIC chip on the CPU board.  Symptoms are a black screen, no boot, no sound, almost seems like a dead power supply

mpcengineer:
Hi. Do not use the Molex version of this connector the crimp pins are too large. The TE Mate-N-Lok works okay.

https://uk.rs-online.com/web/p/pcb-headers/0849041

I am having a problem with the PSU shutting down when switching from standby to ON. The fans give a short rotation, then shutdown. I have noticed if I leave the analyser on for several minutes in standby then the unit will power up.

I have setup a test jig for the PSU and found the 15V is going over voltage. Please see oscillogram.

I noticed in this thread there is mention of the UC3845 reference going faulty. Any idea which is the UC3845 controlling the 15V.

Thanks. MPC

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