ReVox B226, ReVox B226-S CD player repair tip:
A fault that APPEARS LIKE A FAILING LASER is due to partial failure of IC5 on the servo board (IC5 = L272M op-amp), causes the player to be slow in track searching, have a noisy focus motor, and not read the TOC of certain discs, or lose focus towards the end of discs.
It's a $2 chip, worth replacing before buying a new laser assembly.
A fault that APPEARS LIKE A FAILING LASER is due to partial failure of IC5 on the servo board (IC5 = L272M op-amp), causes the player to be slow in track searching, have a noisy focus motor, and not read the TOC of certain discs, or lose focus towards the end of discs.
It's a $2 chip, worth replacing before buying a new laser assembly.
Bumping an incredibly old thread here because I have a stack of 1980’s era Philips-based CD players to restore.
The L272M looks like an opamp: 8-pin DIP package.
But it is actually a power amplifier.
It drives the coils that move the Philips CDM “swing-arm” optical laser pickup.
Because it handles a significant amount of power it has a higher failure rate than standard audio opamps.
-EB
The L272M looks like an opamp: 8-pin DIP package.
But it is actually a power amplifier.
It drives the coils that move the Philips CDM “swing-arm” optical laser pickup.
Because it handles a significant amount of power it has a higher failure rate than standard audio opamps.
-EB