hi,

i had cleaned my cd player for dust and also gears were cleaned. This
requires disassembling the gear from the pickup component. After
assembling it, the player couldnt' read disc. I tried to place the
pickup away from the center before powering up. After turning on, it
moves to track 0. I am not sure if it attempts to focus. It spins twice
then stop. Nothing happens. There is an adjustment in the pickup
assembly at the bottom and i already fiddled with that one. I think
that contributes to the problem but as far as i know, i have set it
back to its original position. Can you please give suggestions on how
to fix this cd player. I have a knowledge in electronics. Thanks in
advance for replies.

ian

You may have damaged one of the ribbon cables, or made something very far
off alignment. To align back a CD is not something that is easy to do,
unless properly equipped, and have the service information.

--

JANA
_____


"yhan" wrote in message
ups.com...
hi,

i had cleaned my cd player for dust and also gears were cleaned. This
requires disassembling the gear from the pickup component. After
assembling it, the player couldnt' read disc. I tried to place the
pickup away from the center before powering up. After turning on, it
moves to track 0. I am not sure if it attempts to focus. It spins twice
then stop. Nothing happens. There is an adjustment in the pickup
assembly at the bottom and i already fiddled with that one. I think
that contributes to the problem but as far as i know, i have set it
back to its original position. Can you please give suggestions on how
to fix this cd player. I have a knowledge in electronics. Thanks in
advance for replies.

ian

"yhan" wrote in message
ups.com...
hi,

i had cleaned my cd player for dust and also gears were cleaned. This
requires disassembling the gear from the pickup component. After
assembling it, the player couldnt' read disc. I tried to place the
pickup away from the center before powering up. After turning on, it
moves to track 0. I am not sure if it attempts to focus. It spins twice
then stop. Nothing happens. There is an adjustment in the pickup
assembly at the bottom and i already fiddled with that one. I think
that contributes to the problem but as far as i know, i have set it
back to its original position. Can you please give suggestions on how
to fix this cd player. I have a knowledge in electronics. Thanks in
advance for replies.

ian


Fiddling with that pot is a strict no-no. It sets the laser output power.
Laser diodes are delicate, and are very easily destroyed by being
over-currented. I only know of one manufacturer that has setting this pot as
part of the setup procedure for their players, and that is Pioneer. They
have proper testpoints, and a proper procedure for carrying out the
adjustment. Whatever the original problem was, by random twiddling of this
pot, you have probably compounded the player's troubles.

As you have a ' knowledge in electronics ', I'm surprised that you started
messing with pots that you did not know the exact function of, and I'm
interested to know the thinking behind "I cleaned it, it didn't work any
more, so I found a random pot and gave it a random twiddle".

Sorry to be so negative, but you do not really give enough info for any of
us to be able to help, anyway. For instance, model number ? What were the
symptoms before you started ? Does the laser burn ? Does it attempt to
obtain focus ? If so, does it achieve it ? and so on ...

Arfa