Working on an #IBM5150 for #DOScember. Following troubleshooting guide on MinusZeroDegrees.net. PSU seems good (stays on when plugged into board), but no beep code from speaker.
Does the T1 Trimmer look ok? It could be broken as mine doesn’t look like the one in photos online.
No obvious damage, no exploding caps, and voltages look good coming off PSU at P8 & P9 connectors.
#VintageComputing #RetroComputing #VintageRepair #ElectronicsRepair
Have you verified that SW1 and SW2 are set correctly for your current configuration?
https://www.minuszerodegrees.net/5150/misc/5150_motherboard_switch_settings.htm
It doesn't have a CMOS, so all the settings are encoded on those.
@jamie
Sure did and I appreciate the tip!
I’m currently configured for following the minimum diagnostics config.
https://minuszerodegrees.net/5150_5160/MDC/minimum_diag_config.htm
I didn't even know that existed. It may have just saved me recapping the entire power supply to fix two caps on the main board. I guess we'll see when the mouser order shows up...
AlanGrassia
Jamie Booth