modessitt
Volunteer: Encyclopedia Submission Moderator
K7400/K7500/U2000/U5000 horizontal sync issue - one fix...
I have seen this on two chassis' so far - a K7400 and a K7500 - and I know the U2000 and U5000 are pretty much the same for the sync circuit, so I figured I post it here for anyone who may have this problem, as it's not on WG's troubleshooting sheet.
Problem: Picture scrolls constantly. Image can be slowed and seen going by in a semi-diagonal manner, but won't lock in.
Prior Repair Attempts: Installed new cap kit. Inspected and repaired all solder joints. Changed out U701. Changed out remote adjustment board and remote adjustment harness with known working set. Problem persists.
Ultimate Fix: Found D700 shorted (zener diode 1N914B). Replaced and have a perfect picture.
I know some of you like this kind of stuff being posted, so there you go...
I have seen this on two chassis' so far - a K7400 and a K7500 - and I know the U2000 and U5000 are pretty much the same for the sync circuit, so I figured I post it here for anyone who may have this problem, as it's not on WG's troubleshooting sheet.
Problem: Picture scrolls constantly. Image can be slowed and seen going by in a semi-diagonal manner, but won't lock in.
Prior Repair Attempts: Installed new cap kit. Inspected and repaired all solder joints. Changed out U701. Changed out remote adjustment board and remote adjustment harness with known working set. Problem persists.
Ultimate Fix: Found D700 shorted (zener diode 1N914B). Replaced and have a perfect picture.
I know some of you like this kind of stuff being posted, so there you go...