This is an old post, preserved for reference.
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It seems recently I've had a run of repairs which have turned out to be fairly straightforward, some like last week's C116 repairs are worth writing up as they are interesting machines, the rest are the same old usual suspects on the same old machines, so I've not written any of the up. This one however, qualifies as it's another interesting machine.
Dead Test cartridge also showed a black screen, so time to look inside.
modified version of the Diagnostic ROM at this point, which knows about the SX-64. The Fails on the IO chips are due to the missing SID and the lack of loopback plugs.
SD2IEC drive and tried that out. (Note there is no cassette port on the SX-64, so you need to specify the Userport connector when ordering).
1541 Test/Diag cartridge (by World of Jani, available from TFW8b.com). This has a good selection of utilities to diagnose issues with Commodore disk drives, which all run from the cartridge.
OPEN1,current address,15,"U0>"+CHR$(new address):CLOSE1
With the SD2IEC now as drive 9, I reconnected the original drive, plugged in the Epyx Fastload cartridge and booted up CBM Command to give the drive a work out.
Ms. Rodman cartridge.