• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

Yamaha SPX90II

H

HadYourPhil

These boxes used to be fairly common in production studios. I have one that is dead, with no obvious clues. The power supply seems ok, putting out its rated voltage when unloaded. When I reconnect the motherboard, all three rails drop. All the caps seem good and the regulators on the motherboard check OK. Anyone have either experience with or a manual for this box?
 
Grab your meter and measure the resistance between each rail point on the motherboard and ground.
One or both will more than likely show a low reading.
Then it's just a matter of isolating the shorted component(s).
 
IIRC, these had a battey somewhere in the works that would eventually die and shut things down. II don't RC, oh well.
 
Battery has 3 volts... I'll try ohming out the rails. Sure wish I had a 'roadmap'.
 
Wish I had a copy I could scan and send you myself. Bet the battery is at fault though. A common failure mode on this unit.
 
Even though removing the main board is a PITA, I'll pull it and substitute a new battery.
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.


Back
Top Bottom