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CD skipping
CD skipping
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Old 22nd February 2019, 12:56 AM   #1
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
CD skipping
Default CD skipping

Morning all

I am currently making a JVC (EZ-RC51) Shigaclone as a gift for my brother (50th).

Its going great and I will post pics when it is done.

BUT

I am having a skipping issue. Sadly I do not know if this was a pre-existing issue ie. prior to pulling the guts out of the boombox - that was done some years ago and this project has been sitting around waiting for completion.

The pcbs has been modded as per tim.cheapo.cc pdf

- PSu is 2200uf Elna Starget > LM7808 > 1000uf Oscon
- C906 is Mundorf Silver/Gold
- C916 is BG standard
- Citizen crystal
- Laser mods

The skipping
- sometimes random
- sometimes the skipping is exact same spot of cd
- sometimes just a single blip before playing on
- sometimes continuous stutter
- sometimes track will not complete and disc just spins, can then FF to next track or pause/play will return the audio for a bit.

Here's what I have done/looked at but have not yet been able to resolve the skipping.

- A virgin laser will have same issue - which I was hoping would be the fix because although redoing the laser mods is a pain at least that would be problem solved
- checked and rechecked all soldering

I wondered if it was an issue with the spindle height - but as the platter is solid and can't be moved I don't see how that could have altered from stock.

For arguments sake I will pull the Citizen crystal and replace with original to rule that out

Thanks in advance for any help/suggestions
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Old 22nd February 2019, 03:00 AM   #2
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
CD skipping
Just re-seated the ribbon cable on the board and laser side and Deoxit both
For a brief moment I thought that I had nailed it
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Old 22nd February 2019, 05:24 AM   #3
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
CD skipping
Seems that it is overly sensitive. A brand new cd played through ok. But any little mark or smudge and it will skip.

Any pointers on a laser that is too sensitive ?
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Old 25th February 2019, 05:24 AM   #4
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
CD skipping
YeeHaa!! Got ya!!

After much head scratching and poking I found a tiny short across the pins of the 0.1uf cap from when I replaced C906. I could tell from the moment the music started that I had the glitch solved - the music was much less congested and the bass better, and that was even before going merrily over the usual skipping spots in my test CDs.

Rock solid now - including my problem CDs

Always glad to be able to put things right >> You should see me dancing round the living room right now

(Note to self: 2 things needed for the future - better lighting in my work area and magnifying glasses!!!)

If you are interested here are some pics of the final product
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Old 25th February 2019, 05:34 AM   #5
Malefoda is offline Malefoda  France
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Well done!
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Thorens TD-318/Ortofon Super OM 20, Teac VRDS-10, Buffalo II/NTD1, Allo DigiOne/Moode, UCD400, JBL 4313Ti
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