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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Sony auto CD player repair question
Hey all;
I'm currently trying to get a Sony EXCD-21 auto CD player up and running. The unit worked fine when it was removed from the previous car, but when I tried to install it in another car, it was dead. I pulled it back out, and hooked it up to my bench PS, and found that it wasn't actually dead, but the display was flashing faintly (all the LEDs for the panel as well as the LCD display). If I hit the reset button, it turns off, but flashes again when I turn it back on. I noticed that when a ground wire for the speaker touched the power ground, I got a steady display and all the controls were now functioning; however, I get no sound out of it. With the ground wire separated, I get a dit-dit-dit sound from the speaker. Any ideas on what to do next? Thanks |
#2
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Sony auto CD player repair question
On Wed, 17 Sep 2003 21:54:14 -0400, "tempus fugit"
wrote: Hey all; I'm currently trying to get a Sony EXCD-21 auto CD player up and running. The unit worked fine when it was removed from the previous car, but when I tried to install it in another car, it was dead. I pulled it back out, and hooked it up to my bench PS, and found that it wasn't actually dead, but the display was flashing faintly (all the LEDs for the panel as well as the LCD display). If I hit the reset button, it turns off, but flashes again when I turn it back on. I noticed that when a ground wire for the speaker touched the power ground, I got a steady display and all the controls were now functioning; however, I get no sound out of it. With the ground wire separated, I get a dit-dit-dit sound from the speaker. Any ideas on what to do next? Does grounding the case fix the problem? |
#3
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Sony auto CD player repair question
Right now it's out of its case - just the circuit board on the bench. I
don't htink that could be it though, because the case is connected to the board at various points. wrote in message ... On Wed, 17 Sep 2003 21:54:14 -0400, "tempus fugit" wrote: Hey all; I'm currently trying to get a Sony EXCD-21 auto CD player up and running. The unit worked fine when it was removed from the previous car, but when I tried to install it in another car, it was dead. I pulled it back out, and hooked it up to my bench PS, and found that it wasn't actually dead, but the display was flashing faintly (all the LEDs for the panel as well as the LCD display). If I hit the reset button, it turns off, but flashes again when I turn it back on. I noticed that when a ground wire for the speaker touched the power ground, I got a steady display and all the controls were now functioning; however, I get no sound out of it. With the ground wire separated, I get a dit-dit-dit sound from the speaker. Any ideas on what to do next? Does grounding the case fix the problem? |
#4
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Sony auto CD player repair question
A lot of car audio equipment locks up as an anti-theft precaution when
disconnected from the 12v supply. You may need to reprogramme it - and you'll need the proper manufacturer's information to do that. "tempus fugit" wrote in message ... Hey all; I'm currently trying to get a Sony EXCD-21 auto CD player up and running. The unit worked fine when it was removed from the previous car, but when I tried to install it in another car, it was dead. I pulled it back out, and hooked it up to my bench PS, and found that it wasn't actually dead, but the display was flashing faintly (all the LEDs for the panel as well as the LCD display). If I hit the reset button, it turns off, but flashes again when I turn it back on. I noticed that when a ground wire for the speaker touched the power ground, I got a steady display and all the controls were now functioning; however, I get no sound out of it. With the ground wire separated, I get a dit-dit-dit sound from the speaker. Any ideas on what to do next? Thanks |
#5
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Sony auto CD player repair question
I checked for DC voltage at the output of the power amp IC, and got about
3v. Maybe the IC is cooked? I also tried grounding the IC directly to the PS, which made no difference. Ditto for resoldering the connections to the board from the IC. Also, when the unit is doing the flashing thing, my voltage drops from 14.4 to about 8. With an ammeter connected, it's only drawing about 300mA so I'm not sure what that is all about. I could go ahead and replace the IC, but I'm not real familiar with car stereos, and there is a lot of logic and SM components in there that I suppose could also be causing the problem. Add to this the fact that I have no schematic, and you can see that I'm running out of ideas. I suppose I could scope the output, but I can already hear what I'm going to see (maybe I'll give it a try anyway). Any other ideas? Thanks wrote in message ... On Wed, 17 Sep 2003 21:54:14 -0400, "tempus fugit" wrote: Hey all; I'm currently trying to get a Sony EXCD-21 auto CD player up and running. The unit worked fine when it was removed from the previous car, but when I tried to install it in another car, it was dead. I pulled it back out, and hooked it up to my bench PS, and found that it wasn't actually dead, but the display was flashing faintly (all the LEDs for the panel as well as the LCD display). If I hit the reset button, it turns off, but flashes again when I turn it back on. I noticed that when a ground wire for the speaker touched the power ground, I got a steady display and all the controls were now functioning; however, I get no sound out of it. With the ground wire separated, I get a dit-dit-dit sound from the speaker. Any ideas on what to do next? Does grounding the case fix the problem? |
#6
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Sony auto CD player repair question
Thanks Nigel.
The unit is maybe 10 yrs old, and was only about $100 installed. I've never heard of the anti theft lockup you describe - how long have they been doing that? Do you think it is likely they would have put something like this in a cheaper unit as well? Thanks again "Nigel" wrote in message news A lot of car audio equipment locks up as an anti-theft precaution when disconnected from the 12v supply. You may need to reprogramme it - and you'll need the proper manufacturer's information to do that. "tempus fugit" wrote in message ... Hey all; I'm currently trying to get a Sony EXCD-21 auto CD player up and running. The unit worked fine when it was removed from the previous car, but when I tried to install it in another car, it was dead. I pulled it back out, and hooked it up to my bench PS, and found that it wasn't actually dead, but the display was flashing faintly (all the LEDs for the panel as well as the LCD display). If I hit the reset button, it turns off, but flashes again when I turn it back on. I noticed that when a ground wire for the speaker touched the power ground, I got a steady display and all the controls were now functioning; however, I get no sound out of it. With the ground wire separated, I get a dit-dit-dit sound from the speaker. Any ideas on what to do next? Thanks |
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