Misc Computers

[channelmaniac]

Model: Turbo-XT 8MHz Motherboard
Symptom: Dead

Replaced shorted tantalum cap holding the power supply in shutdown. Tested.

[channelmaniac]

Model: Wyse 60 Terminal
Symptom: Dead.

Terminal had previous attempted repairs done to it and had 2 diodes half desoldered.

Replaced shorted diode D203, a high speed 1000PIV diode, and the replacement became red hot and shorted. Replaced 2 caps in the horizontal section with cracked tops. Measured the high voltage at the CRT and it was only 5KV. Replaced the flyback and D203 again and tested.

[channelmaniac]

Model: DEC 486 PC
Symptom: Dead

Fails boot. CPU was not sitting flat in socket. Pulled chip and straightened 2 terribly bent pins and 1 slightly bent pin. Reinserted CPU into PGA socket and tested.

[channelmaniac]

Model: Osborne 1
Symptom: Dead

Replaced two bulging capacitors on the power supply board. Replaced one shorted tantalum capacitor on the main logic board. Booted computer. B: drive errors. Lubed the worm gear and spindle clamp bearing on the B: drive then moved a shaft hold down that was interfering with the head moving back to Track 0. Tested. Took unit to Dallas Makerspace where a member replaced the brittle leather handle with a custom made one. Cleaned exterior of unit and retested.

This unit was being entered into the fundraising auction at VCF Southwest.