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Old 2nd October 2004, 11:44 PM   #1
hiwiho is offline hiwiho  Germany
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Question only reading cds after warm-up

despite the other thread, my nakamichi cd player 4 has a strange problem. If the rooms temperature is less than 20degrees celsius, the player only reads cds after some minutes warm-up and might even quit while playing under cracklin' noise. What is that? Laser unit needs to be replaced?? It's a kss210a - has the player to be adjusted after replacement? The pcb offers VCO, EFM Signal, EF balance, focus gain and track gain adjustment but needs a special test. Neither do i have this nor the 2channel oscilloscope (but the service manual)...

thanx, matthias
from berlin/germany
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Old 4th October 2004, 12:16 AM   #2
hiwiho is offline hiwiho  Germany
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OK, see other thread: Skipping and failure during play is unfortunately caused by a damage to one of the gear wheels of the ksm210 drive unit.

Warm up problem still unsolved...

matthias
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Old 4th October 2004, 04:48 AM   #3
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Try resoldering the components if the unit is old enough
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Old 4th October 2004, 09:31 AM   #4
hiwiho is offline hiwiho  Germany
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Yes, its a circa 1990 nakamichi and I started resoldering until I found that mechanical failure in the drive. Won't be able to verify resoldering until i get a new gear wheel - and that's gonna be hard enough
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Old 4th October 2004, 08:58 PM   #5
Netlist is offline Netlist  Belgium
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I don't know about Germany but there's a dealer/service center in the Netherlands.
Here's the address:
TRANSTEC BV
SCHIEDAMSEVEST 71
3012 BE ROTTERDAM
tel: 010-4147055
http://www.transtec.nl/

They are expensive

/Hugo
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Old 4th October 2004, 09:03 PM   #6
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I have the same exact warmup problem in my Marantz 53 cd player. It's a '91-'92 model. I just leave it on, but I would like to resolve it.

Vince
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Old 5th October 2004, 06:01 AM   #7
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Default round cracks in solder points

Take a look at the solder points especially near and around the hot components (if too old, then everywhere), you will find a circle on the solder points which is a crack. This opens the connection, and probably makes connection due to expansion when the device is kept on.
Use lens or eye loupe if having sight problems for close observation.

Solder the cracked points (its best if done for all the solder points) but care should be taken not to form solder bridges.

Change all the electrolytics that are close to hot devices.

Beware: Take all the precautions necessary in handling.

Gajanan Phadte
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Old 6th October 2004, 06:22 AM   #8
hiwiho is offline hiwiho  Germany
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A massive resoldering did the job - I had to work on it anyway cause of my distortion problem. Bought the whole thing cheap for only 12euros and it very much looks like it's seen some service before...

matthias
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Old 9th July 2012, 09:11 PM   #9
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Default cd player 4 reads cd after warmup

Hello,
i have two CD player 4 here with this problem.
after 10-15 minutes warmup the player reads CD.
I found a FOCUS problem: the lens on the laser does no raise up enough. When i push on the CD to reach the lens focus point, the CD start to play.
After a few minutes, focus have more powe and the player starts by itself.
Replacing the laser does not resolve the problem, i tried...
Does someone have an idea?
thanks!
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Old 10th July 2012, 07:22 AM   #10
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Quote:
Originally Posted by troubadour1242 View Post
Hello,
i have two CD player 4 here with this problem.
after 10-15 minutes warmup the player reads CD.
I found a FOCUS problem: the lens on the laser does no raise up enough. When i push on the CD to reach the lens focus point, the CD start to play.
After a few minutes, focus have more powe and the player starts by itself.
Replacing the laser does not resolve the problem, i tried...
Does someone have an idea?
thanks!
Hi
Solder the cracked point and make revision on electrolytic cond. (look for leakage)
Have fun
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