non-tracking cd player

[[email protected]]

hi all,

i've got a sherwood mini system cd/tuner/tape etc deck and the cd player
has stopped working. it's quite old now, but a good unit, so i'd like to
fix it.

it starts to play a cd, and then a few seconds in it gives up and decides that
there isnt a disc. i suspect what might be happening is that the fine tracking
with the magnetic coils is working but the motor drive to do the coarse
either doesnt work or is badly adjusted. i've had it running with the lid off,
and it seems to wiggle the lens assembly, but the whole head doesnt ever move.

the worm drive is free to move, and i greased it up a bit with some silicone
spray, but it didnt fix it. the lens is clean and the few seconds of music that
it does play sounds fine.

theres a trimpot in there (maybe a tuning cap, too hard to see) that i gave the tiniest tweak and stopped it working altogether. when i tweaked it back it
came back to it's usual half broken state.

anyone got any clues? or know someone who'll fix it for a reasonable
price. i like it because it integrates with the whole system, but if it costs
more than $50ish to fix, i'll just buy a new cd player.

thanks in advance,
cory

 

[Phil Allison]

**Yeah, right. 50 bucks. What planet are you from? Buy a new player.

** You can now get a DVD player with the lot for $ 89.00


see http://www.strathfield.com/Product.asp?ProdID=415



............... Phil

 

[Trevor Wilson]

** You can now get a DVD player with the lot for $ 89.00


see http://www.strathfield.com/Product.asp?ProdID=415

**Yeah and that's the "Delux" model. I wonder how much the basic one is?

Makes it pretty hard to justify repairing these things.

 

[Trevor Wilson]

I can think of two reasons why it's justified:

1) Employment or

if the above is not economically plausible

2) Reduce reuse recycle = repair

**Given that service to audio equipment represents a significant proportion
of my income, it distresses me mightily that many products are no longer
worth servicing. However, we must be realistic about such things. People
will always choose the least expensive option when presented with more than
one.

 

[Rudolf Ladyzhenskii]

I suspect a bad laser. The good news, that it is likely to be a cheaper one
(KSS210). Replacing this will cost more than $50, but I think it may be
worth it.

If in Melbourne, call me on 0414 635 468.

Rudolf

hi all,

i've got a sherwood mini system cd/tuner/tape etc deck and the cd player
has stopped working. it's quite old now, but a good unit, so i'd like to
fix it.

it starts to play a cd, and then a few seconds in it gives up and decides that
there isnt a disc. i suspect what might be happening is that the fine tracking
with the magnetic coils is working but the motor drive to do the coarse
either doesnt work or is badly adjusted. i've had it running with the lid off,
and it seems to wiggle the lens assembly, but the whole head doesnt ever move.

the worm drive is free to move, and i greased it up a bit with some silicone
spray, but it didnt fix it. the lens is clean and the few seconds of music that
it does play sounds fine.

theres a trimpot in there (maybe a tuning cap, too hard to see) that i

gave the tiniest tweak and stopped it working altogether. when i tweaked it
back it

 

[-:Install:-]

Put your finger on the servo drive ic..... hot ?? get this a lot with Sony
equipment. Freeze it up and run the unit again... should run a tad longer.
If it has discrete transistor drive do the same, check them all.

 

[Ken Taylor]

I think the laser is ok, but there are some funny symptoms....

when the unit is _off_ (well.... on standby) the laser seems to be turned

on. I can see a dim red light coming out of it. When I turn the unit on, the
laser

turns off until I select the CD function. Then the laser comes on again,
blinks a few times as it tries to find the CD and then turns off.

Why should the laser be ON when the whole unit is OFF?

also, sometimes when it tries to play a disc the spindle will try to spin up,
almost get up to speed and then turn backwards weakly for a few turns. like
a three phase motor running off only one phase.

It's a Sherwood CD-77R, by the way.

thanks again,
cory

You aren't *looking* at the laser are you? They aren't joking with the
warnings!

Ken

 

[[email protected]]

You aren't *looking* at the laser are you? They aren't joking with the
warnings!

no, not directly, but it's pretty easy to see that it's on.

they're not all that dangerous, though. sure, prolonged looking is bas news,
but the beam isn't collimated enough to be at any dangerous intensity by
the time it gets to your eye.

still, i'm not condoning looking right at it.

cheers,
cory

btw: sign in physics lab at melb uni many years ago:

"please do not look into the laser with your remaining eye"