No negative rail, no LCD
Posted: Aug 29th, '20, 08:12
Hi all,
Just finished my 1.02 build and having a strange set of problems. My troubleshooting skills are somewhat lacking so Im hoping for a little direction. Ive double checked all the components and IC orientations and after correcting a flipped diode and electro cap, everything seems to be good.
When not plugged in, I get normal voltages from the power suply, +15/+5/-15 but as soon as its plugged into the main board the -15 drops to ~0V. That said, I was able to get 5V at TP1 and the sequencer appears to be functioning normally. Unfortunately there's no audio and the LCD is not powering on(im guessing due to the lack of a true negative rail)
Would the loss of a negative rail imply there's a short somewhere? Or something wrong with an IC? Any pointers on where to start troubleshooting?
Just finished my 1.02 build and having a strange set of problems. My troubleshooting skills are somewhat lacking so Im hoping for a little direction. Ive double checked all the components and IC orientations and after correcting a flipped diode and electro cap, everything seems to be good.
When not plugged in, I get normal voltages from the power suply, +15/+5/-15 but as soon as its plugged into the main board the -15 drops to ~0V. That said, I was able to get 5V at TP1 and the sequencer appears to be functioning normally. Unfortunately there's no audio and the LCD is not powering on(im guessing due to the lack of a true negative rail)
Would the loss of a negative rail imply there's a short somewhere? Or something wrong with an IC? Any pointers on where to start troubleshooting?