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Old 8th October 2007, 08:47 AM   #7901
Thomo is offline Thomo  United Kingdom
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I have a strange problem, if any of you nice people would like to help.

I have modded a mate's cd67, Superclock 4 & power supply + invisus + a couple of 5v regs for digital and a load of bg's. It sounds awesome, but:

The laser keeps bobbing up and down when the player is in stop mode, it sounds like a vibration and if I put my finger on the lens, it stops. It takes longer than my player to read the toc and change tracks, but other than that it plays perfectly.

Help anyone?

Lee.
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Old 8th October 2007, 09:01 AM   #7902
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LOL Thats a good one

Check around Q107. Could be a low or high ref voltage.

Or a reg you have fitted is oscillating.

Check all grounds to the regs you have fitted.

Brent
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Old 8th October 2007, 09:51 AM   #7903
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by jimh0612
...
Just one more question please Ray.

The link from your site to download the eps format of the clock pcb doesn't seem to work for me.

Don't think it's anything I'm doing as I got the CD outputstage eps fine - opened in Photoshop with no problems at all.

I've nearly finished building it on tripad stripboard from Maplins

Jim
Hi Jim,

Try renaming the file to .eps, it seems when saving it, IE is very stubborn and want to save it as .PS.

Ray
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Old 8th October 2007, 09:52 AM   #7904
Thomo is offline Thomo  United Kingdom
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Quote:
Originally posted by rowemeister
LOL Thats a good one

Check around Q107. Could be a low or high ref voltage.

Or a reg you have fitted is oscillating.

Check all grounds to the regs you have fitted.

Brent
Cheers Brent. I've checked all voltages and nothing seems to be bad. I checked all the reg outputs with an analogue multimeter and the needle is rock-solid. The problem only seems to occur when the player has been switched on for an hour or so.

The tx feeding the dig and analog rails gets mighty hot, I think it's overloaded, so I've connected both windings for double the va, and used the spare winding off the clock tx for the dig regs. The tx is not as hot now. Could it have been overheating and causing a bad ac output? It's running now, so I'll let you know my findings.

Lee.
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Old 8th October 2007, 10:04 AM   #7905
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It could have been bad ac due to the load. What VA is the TX and how many regs were you running off it.

Brent
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Old 8th October 2007, 11:10 AM   #7906
Thomo is offline Thomo  United Kingdom
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2.3va 2x0-15. I was running one Invisus from one winding and two 7805's from the other winding.

it seems the 7805 regs are causing the temperature rise.

Lee.
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Old 8th October 2007, 11:58 AM   #7907
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I assume its 2.3VA per winding. I which case it should be ok.
Unless you are running a super clock on it

Brent
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Old 8th October 2007, 12:11 PM   #7908
SimontY is offline SimontY  United Kingdom
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I'd guess the Invisus runs the Superclock, right?

Simon
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Old 8th October 2007, 12:19 PM   #7909
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I would guess he's running DAC analogue off it. It is also the best place for it

Brent
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Old 8th October 2007, 12:35 PM   #7910
Thomo is offline Thomo  United Kingdom
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Quote:
Originally posted by rowemeister
I would guess hes running DAC analogue off it. It is also the best place for it

Brent

Bingo.

Whichever tx I connect the 7805's to it gets really hot. Too hot to touch! I've checked the regs and everything seems fine. They're both giving 5.05v.

Does the SuperClock4 need a large tx? The power supply is 4x11dq09, 10,000uF 40v BC, lm317 with zener's, 3300uF 16v on 11.75v output.

The tx feeding the clock is warm but seems perfectly ok.

Lee
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