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

L

Lenny

Jan 1, 1970
0
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.
 
A

Ampdoc

Jan 1, 1970
0
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
 
S

Sam Goldwasser

Jan 1, 1970
0
Common with Pioneer CD changers in general if spindle motor not the
problem: lens fallen out, bad ribbon cable, deteriorated grommets.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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Important: Anything sent to the email address in the message header is ignored.
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M

Mark D. Zacharias

Jan 1, 1970
0
This model is not prone to the bad cable - it's a built-in part of the
pickup, and doesn't get "kinked"

I've seen lots of bad pickups on these - either the lens falls off as Sam
mentioned, or the pickup is simply bad. I've seen them oscillate when the
focus ramp is applied.

Replacement is no fun. (That damned grating adjustment!)

Mark Z.
 
L

Lenny

Jan 1, 1970
0
So will I find the lens lying inside the unit? And can it be re attached? Lenny.
 
M

Mark D. Zacharias

Jan 1, 1970
0
So will I find the lens lying inside the unit? And can it be >re attached?
Lenny.

Might be rolling around loose in there. I've seen them stuck down inside the
disc changer mechanism, stuck in grease. Once or twice I never did find the
lens.

It's very tricky to re-glue one of these. Don't use superglue - it will fog
the lens permanently. Remove the plastic pickup cover and glue the lens in
place with 3 or 4 very small spots of airplane type glue. Be very careful
not to let any glue get between the coils and magnet posts. It'll never move
after that!

Mark Z.
 
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