Re: Pioneer CD player, model no. PD-M550 spindle motor problem

From: Ampdoc (ampdoc_at_NOSPAMhotmail.com)
Date: 06/17/04 

Date: Thu, 17 Jun 2004 10:07:32 -0500

The units not achieving focus lock. The sequence of events for this and most
other Pioneer units is as follows:

Load
Check for disc present- this is done by cycling the laser on in the pickup
and sweeping the lens for a FOK signal.

If FOK=No good then go to next tray in multi-cd, or stop and display no disc
on single cd units.

If FOK=Good then spindle motor activated and unit goes for tracking lock.

If tracking and focus lock are OK, then the unit puts the servos for focus
and tracking in closed loop mode, and normal playback begins.

Knowing this sequence we can determine that your unit is failing to achieve
focus on the disc. Either you have a bad pickup assembly, a bad ribbon cable
from the pickup to the main PCB, or the decoder IC on the main pcb is
defective. Most likely is a bad ribbon cable, as this was a very common
failure for this unit. I do not know if the ribbon is available as a
separate part, it's been a long time since I've worked on one of these. 

-- 
Jammy Harbin
J & J Electronics, Inc.
227 S. 4th St.
Selmer, TN 38375
731-645-3311
"Lenny" <captainvideo462002@yahoo.com> wrote in message
news:d980bc2c.0406170551.15390138@posting.google.com...
> This unit is a five disc changer which uses the plug in cartridge. The
> changer sequences through all the discs but the motor never starts up.
> There is no DC voltage present at the motor terminals after each disc
> seats so I don't think that its a motor problem. Does anyone have any
> information on this symptom relating to this model? Thanks very much.
> Lenny Stein, Barlen Electronics.

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