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Old 10th August 2003, 12:43 PM   #1
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Unhappy TEAC VRDS7. Problem

Hello!

I have a TEAC VRDS7(CMK4-drive) and it's not operating properly any more. When a CD is loaded, the player exhibits problems in reading the TOC. It appears to work "hard". The display and LED's on the fron-panel is "flashing" due to excessive current-draw from the power suplly. I have checked the power supply and it is ok.

Anyone got a service manual for TEAC VRDS 7 or the CMK4-drive unit?

best regards\Morello
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Old 10th August 2003, 04:24 PM   #2
alfsch is offline alfsch  Germany
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Hi,
i have the manual,
what do you need (pages: 20 !);
is the mechanic part ok? and the power supp.?
alf
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Old 10th August 2003, 06:36 PM   #3
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Hello alfsch!

Thanks for your reply. :-)
The problem is partially solved. The DC-motor draws to much current causing the rail-voltage(+5 volts) to drop. When the voltage drops, the players logic doesn't work. I belive that the motor is internally shorted I implemeneted a 3.9 ohms resistor in series with the motor to reduce the peak-current and the player does in fact work! However the motor accelerates a bit to slow making the player slow in start.

The motor measures a series resistance of 3.5 ohm, which I belive is to low.

I will buy a new motor, but where?

Do you have the manual scanned? Can you guess what pages are relevant for this problem. Also i belive I must adjust focus- and tracking gain. Can you find any info regarding that in your manual?

Best regards\Morello
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Old 10th August 2003, 06:37 PM   #4
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Hello alfsch

The power supply i ok.
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Old 11th August 2003, 11:58 AM   #5
alfsch is offline alfsch  Germany
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Hi,
motor: disconnect the motor, drive with external supply, for test, 12 V; should run at high speed;
you could use it with the added resistor...;
manual is paper;
adjust: mark trim positions with pen (to find them again!!),
then play a cd, no amp connected, so you hear the noise from the pickup; turn foc and track gain, so the noise is lower, further reducing stops tracking, turn back a little - - and you have the opt position!
ok?
alf
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Old 11th August 2003, 01:14 PM   #6
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Hello!

I ordered a new motor today. Only USD 15
I will have the new motor within 3 days or so

Thanks for the advice. That how I have adjusted T and F-gain before. Is there any more info regarding tracking- and focus-gain adjustments in the manual?

Best regards\Morello
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Old 11th August 2003, 06:51 PM   #7
alfsch is offline alfsch  Germany
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Hi,
adjustment is 4 pages (half in japanese...),
but i think, the better sound you get with lower gain settings, as you already did, than the original high settings;
for track + foc balance adj: you need a scope..
alf
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Old 11th August 2003, 07:05 PM   #8
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Hello alfsch

Does the manual tell where the testpoints are located?
Is there any info regarding the waveforms/amplitude?


I have five scopes to choose from
(the rather old Hitaschi 100MHz is my favorite)

best regards\Morello
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Old 13th August 2003, 10:43 PM   #9
alfsch is offline alfsch  Germany
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Hi,
...yes...yes.
i try to make a scan for you at a friend; have no scanner at the moment; got your motor already ?
alf
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Old 14th August 2003, 11:11 AM   #10
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Hello Alf

I will get my motor today or tomorow

Very kind of you if you could scan the manual partially

Best regards\Morello
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