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Old 2nd Nov 2019, 11:45 am   #11
Phantomrose1999
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Join Date: Mar 2008
Location: Melbourne, Victoria, Australia
Posts: 289
Default Re: Grundig TK920 3D Exploding Caps

Much closer but the fat lady aint singing..

1. Replaced the Motor Caps, with a separate 3.5uf +1uf. See photos, motor works.

2. Cleaned the wax off and the black tar off from everywhere. Used a hair dryer to melt it then wiped it off with cotton buds and tissues.

3. Replaced all the black WIMA caps. Some split but replaced all, including two under the head mechanism..

4. Replaced the 4x spark supressors, (RC networks). Interestingly these were all cut off at some time previously.

THE GOOD NEWS: Everything works, with the tape playing from right to left.

THE BAD NEWS: When i change direction, (to start playing from left to right), it works for a sec or two, THEN THE LEFT REEL LOCKS UP ! Its getting power to lock it, as i can feel it is free at the start, but within a sec or two, it locks.

Does anybody have any ideas ? Tried to read the schematic and no chance to figure it out.. ha.

Possible guesses:

- The left side has the main motor power relay, where i added 2 RC networks. No problem here.

- The right side has another relay, which has the 2x RC networks cut, i added 2x RC networks, which were previously cut. Not sure which relay as its back together. Should i cut these ?

Well, hope someone has some ideas...

Check out the photos, there is also some Youtube video's

https://www.youtube.com/watch?v=IHqDDdRdGsU
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