[TechAssist] Re: Pioneer CD,M#PD-M550, won't read disks
- From: Tom Sherman <bayside.electronics@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 27 Jan 2004 16:04:02 -0400
Daryl, have you done the grating adjustment on the new pickup? This is a
very critical adjustment that has to be performed on these Pioneer
units. If the grating is off even a little, they simply will not read
the disc. It is a fairly tricky procedure that requires a steady hand
and lots of patience. You will also need a good scope and test disc,
such as the Sony YEDS-7. The service manual explains the procedure.
Also, check the spindle motors on both units. These motors have a high
failure rate. Over the years I have replaced spindle motors more often
than pickups.
The first thing I check when servicing a CD player is the eye pattern.
It should be in focus, not fuzzy, and on a Pioneer the amplitude should
be approx. 1.2-1.7 VPP. There should also be minimal jitter present.
Tom @ Bayside Electronics
Tom Sherman
Bayside Electronics
Digby, NS
Canada
Phone/Fax (902) 245-5375
peggs wrote:
>your new pick-up probably has to be aligned
>
>your second one may be bad also
>
>Peggs
>
>At 10:03 AM 1/27/04, D Thunhurst wrote:
>
>
>>Hi,
>>I am in desperate need of some help on this Pioneer CD.
>>Some months back I tried to repair this dog. It originally would be very
>>sensitive on reading the disks. Sometimes it would play them but it might
>>randomly skip all over the tracks. I replaced the pick-up but then it
>>wouldn't play at all. Yes, I did remove the jumper from the new pick-up.
>>I figured it had some other problem so I set it aside. A few days ago a
>>PD-M430 came in with a skipping problem. The pick-ups were the same so I
>>swapped them with one another. The problems followed with the pick-ups.
>>My question is... What is the possibility of my new pick-up be defective? I
>>hate to make a fool of myself bitching to Pioneer that I have a defective
>>pick-up from them and in reality it may be good. I did get the alignment
>>procedure on the laser but it doesn't help.
>>I tried to locate the problem on the PM-D430 with the skipping and need
>>advice on it as well.
>>I looks for the disk and it will start to play but the pick-up starts to
>>wander back and forth until it can no longer stay on track and jumps to
>>another track. I subbed the motor that moves the laser from the PM-D550 and
>>it had the same problem. So no help there.
>>I hate these kind of dogs.
>>Appreciate any help.
>>Daryl
>>Daryl's TV
>>2402 Wyoming Ave.
>>El Paso, TX 79903
>>915-565-9184 Voice/Fax
>>dthunhurst@xxxxxxx
>>http://dynacomp.freeyellow.com
>>
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