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Old 19th February 2006, 09:35 PM   #1
spock is offline spock  Canada
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Default uh oh me thinks me killed my cdp

While I had my cdp. opened up to check the tubes, I figured that I would install a couple of 8 pin sockets for the last pair of opamps on the board. (I had previously done this with the other 2 pair). While I did loose 1 solder pad, no big deal, just ran a wire to the next component on the board, checked my continuities and everything seemed ok. Well, I put it all back together with the new opamps and hit the switch. Lights up, no smoke, wait a minute for things to stabalize and hit the open button. Nothing. It just sits there showing a display of track 00 time 00 and the track list of 1 through 20> as if there were a disc of more than 20 tracks long loaded. So I shut it dowwn, pull the lid off the transport and put a disc in. Put the lid back on and same display, disc spins- no signal output. It's like the transport does not arrive at it's ready position to read a disc. Initial thoughts are that I some how fried the microcontoller chip, but I didn't even come anywhere near it. I know that it's a long shot, but any thoughts/help with my delema would be very much appreciated. I do like this CDP and after various mods the sound is very much improved over the stock version-until now!
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Old 19th February 2006, 09:48 PM   #2
anatech is offline anatech  Canada
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Hi spock,
With any luck, you only blew a semi fuse. What transport is it?

-Chris
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Old 19th February 2006, 10:06 PM   #3
poynton is offline poynton  United Kingdom
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HI.

You did put the opamps in the right way round??

Andy
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Old 19th February 2006, 10:49 PM   #4
spock is offline spock  Canada
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I believe that it is a Matsushita transport. It has CD2 marked on it. The player is a QDS-15 which is the OEM of the Norh CD-1. Here goes showing my lack of electronics skills: What's a semi-fuse?

And, yes I did put the opamps in the right way round. They are in the analog section, which is why I am puzzled.
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Old 19th February 2006, 11:06 PM   #5
anatech is offline anatech  Canada
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Hi spock,
A semi-fuse looks like a transistor but only has two legs. They blow extremely quickly. No flash and most people are not aware they exist. Common in CD players.

-Chris
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Old 19th February 2006, 11:20 PM   #6
spock is offline spock  Canada
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Thanks Chris; so if upon searching for one of these two legged devices I find one that does not show continuity between the two legs I can assume that it has failed?

I guess I'm like most people-I had no idea.
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Old 19th February 2006, 11:33 PM   #7
anatech is offline anatech  Canada
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Hi spock,
Yup. It's dead. They are called ICP protectors. They come in two case styles.

Don't worry, many tech's don't know they exist. That's what I meant.

-Chris
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Old 19th February 2006, 11:37 PM   #8
spock is offline spock  Canada
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Hi Chris,
I'm thankfull for your patience. The two case styles would be?
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Old 20th February 2006, 02:08 AM   #9
anatech is offline anatech  Canada
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Hi spock,
No problem.

The first type has a TO-92 case using the two outer leg positions. The other is that small rectangular Janaese style with a "round" taken out of what would be the emitter end. Very short legs on the latter style. They are interchangeable.

If you really get stuck, I'm in Georgetown. I don't know how far that might be from you.

-Chris
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Old 20th February 2006, 02:32 AM   #10
spock is offline spock  Canada
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Georgetown is only about 1.25 hrs from me. It is very generous of you to offer to help me out. I may just take you up on it.
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