uh oh me thinks me killed my cdp

spock · 19th February 2006, 09:35 PM

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!

anatech · 19th February 2006, 09:48 PM

Hi spock,
With any luck, you only blew a semi fuse. What transport is it?

-Chris

poynton · 19th February 2006, 10:06 PM

HI.

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

Andy

spock · 19th February 2006, 10:49 PM

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.

anatech · 19th February 2006, 11:06 PM

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

spock · 19th February 2006, 11:20 PM

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.

anatech · 19th February 2006, 11:33 PM

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

spock · 19th February 2006, 11:37 PM

Hi Chris,
I'm thankfull for your patience. The two case styles would be?

anatech · 20th February 2006, 02:08 AM

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

spock · 20th February 2006, 02:32 AM

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.

19th February 2006, 09:35 PM	#1
spock diyAudio Member Join Date: Feb 2006 Location: North of TO.	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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19th February 2006, 09:48 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi spock, With any luck, you only blew a semi fuse. What transport is it? -Chris

19th February 2006, 10:06 PM	#3
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	HI. You did put the opamps in the right way round?? Andy

19th February 2006, 10:49 PM	#4
spock diyAudio Member Join Date: Feb 2006 Location: North of TO.	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.

19th February 2006, 11:06 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

19th February 2006, 11:20 PM	#6
spock diyAudio Member Join Date: Feb 2006 Location: North of TO.	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.

19th February 2006, 11:33 PM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

19th February 2006, 11:37 PM	#8
spock diyAudio Member Join Date: Feb 2006 Location: North of TO.	Hi Chris, I'm thankfull for your patience. The two case styles would be?

20th February 2006, 02:08 AM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

20th February 2006, 02:32 AM	#10
spock diyAudio Member Join Date: Feb 2006 Location: North of TO.	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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