only reading cds after warm-up

hiwiho · 2nd October 2004, 11:44 PM

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

hiwiho · 4th October 2004, 12:16 AM

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

gmphadte · 4th October 2004, 04:48 AM

Try resoldering the components if the unit is old enough

hiwiho · 4th October 2004, 09:31 AM

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

Netlist · 4th October 2004, 08:58 PM

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

vdi_nenna · 4th October 2004, 09:03 PM

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

gmphadte · 5th October 2004, 06:01 AM

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

hiwiho · 6th October 2004, 06:22 AM

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

2nd October 2004, 11:44 PM	#1
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	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

5th October 2004, 06:01 AM	#7
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	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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4th October 2004, 12:16 AM	#2
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	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

4th October 2004, 04:48 AM	#3
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	Try resoldering the components if the unit is old enough

4th October 2004, 09:31 AM	#4
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	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

4th October 2004, 08:58 PM	#5
Netlist diyAudio Moderator Join Date: Jan 2003	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

4th October 2004, 09:03 PM	#6
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	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

6th October 2004, 06:22 AM	#8
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	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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