Hi
I recently bought a PDR-05. It's a nice bit of kit but it has a problem - I can't get any sound out of it
. The drawer opens, cd spins, TOC is read and CD plays, and that's it. I've checked analogue and digital outs - nada.
I've looked over the main audio i/o board and checked the Voltage regs - juice is OK. I inserted a blank CD to see if I could get some life in record mode - again zip.
I have bought the service manual and gone through troubleshooting - but it doesn't cater for this type of trouble!
I'd be grateful for any suggestions or experiences from members who have had similar issues.
All the best
Bernie
I recently bought a PDR-05. It's a nice bit of kit but it has a problem - I can't get any sound out of it
. The drawer opens, cd spins, TOC is read and CD plays, and that's it. I've checked analogue and digital outs - nada.I've looked over the main audio i/o board and checked the Voltage regs - juice is OK. I inserted a blank CD to see if I could get some life in record mode - again zip.
I have bought the service manual and gone through troubleshooting - but it doesn't cater for this type of trouble!
I'd be grateful for any suggestions or experiences from members who have had similar issues.
All the best
Bernie
Hard to say... as you have a manual perhaps start at the outputs and work back (or is that forwards ) Look for any muting circuit, see whether it's in the wrong state etc.
Just normal fault finding... even buzzing inputs of any op amps in the analogue stages etc to see if there is any output.
If you can post an image of the circuit analogue side of things might have a better idea what you can check.
) Look for any muting circuit, see whether it's in the wrong state etc.Just normal fault finding... even buzzing inputs of any op amps in the analogue stages etc to see if there is any output.
If you can post an image of the circuit analogue side of things might have a better idea what you can check.
Hi Bernie, if you aren't getting anything on the digital output then i'd assume the problem was something in the digital domain rather than analogue. If the analogue stage had failed then the digital output would still function (unless it was a power supply issue)
This appears to be a logical deduction, though i could be a country mile out Frankly i'm pretty useles to you here as i have only ever dealt with analogue electronics, as that is what has interested me.
You need someone who knows what they are doing with the gubbins i know nothing about, sorry.
Best of luck with it anyway
Thanks for the quick responses! I've checked for a mute - there is, however it appears to be a record mute, so really shouldn't have any effect on output.
I note on the input selector between digital 1, digital 2 and analogue, the level display shoots off the scale on analogue but not on digital. My next port of call, I think!
I note on the input selector between digital 1, digital 2 and analogue, the level display shoots off the scale on analogue but not on digital. My next port of call, I think!
After the encouragement, I removed the i/o board and inspected the digital board beneath. I found a slightly corroded component which I didn't recognise immediately. I removed the board and found more gunk, that had leaked out. On removal, the component was found to be made by Elna. It looks like a submin battery but is a super capacitor, 0.22F 5.5V. I've cleaned the board with meths - my favourite tipple - and ordered a new cap. I couldn't source a 0.22F so I've bought a 0.47F 5.5v. I'll report back if this proves successful.
Bernie,
Take a look at the thread on the PDR-555RW, which also has an Elna supercap that tends to leak . It's at http://www.diyaudio.com/forums/digital-source/19164-please-help-fixing-pioneer-pdr-555rw.html .
The Elna cap is only used to power the circuit that stores the TOC info before it's written to the CD, in case you lose power, and it's not needed otherwise. On the PDR-555RW, the ATIP decoder chip circuitry is often affected as the traces in the vicinity get corroded, and the unit will not recognize any media . I don't know what's near the Elna cap on the PDR-05, but that would be something to look at further...
I'm also sending you a PM with a little more info.
Take a look at the thread on the PDR-555RW, which also has an Elna supercap that tends to leak
. It's at http://www.diyaudio.com/forums/digital-source/19164-please-help-fixing-pioneer-pdr-555rw.html .The Elna cap is only used to power the circuit that stores the TOC info before it's written to the CD, in case you lose power, and it's not needed otherwise. On the PDR-555RW, the ATIP decoder chip circuitry is often affected as the traces in the vicinity get corroded, and the unit will not recognize any media
. I don't know what's near the Elna cap on the PDR-05, but that would be something to look at further...I'm also sending you a PM with a little more info.
It sounds promising as long as the print etc is intact... backup caps and batteries have been a major problem through the years on loads of kit.
You can always put an electroylitic in to test... honest, something like 100uf. It should all work.
Foam cleaner is good for cleaning PCB's with a brush, then wash in warm water... as long as there are no "mechanical" parts, tuned coils etc. Boards come up like new. Done that to dozens of TV chassis too, with no problems.
Good luck
You can always put an electroylitic in to test... honest, something like 100uf. It should all work.
Foam cleaner is good for cleaning PCB's with a brush, then wash in warm water... as long as there are no "mechanical" parts, tuned coils etc. Boards come up like new. Done that to dozens of TV chassis too, with no problems.
Good luck
Hi Bernie,
Be interesting to see if sorting that cap out fixes it. If the gunge from inside is shorting other things out it could cause the problems I guess. If not I'd not know where to look with any precision but as the thing reads discs I'd guess the signal from any decoder or digital filter is somehow not reaching the DAC and digital output.
Simon
Be interesting to see if sorting that cap out fixes it. If the gunge from inside is shorting other things out it could cause the problems I guess. If not I'd not know where to look with any precision but as the thing reads discs I'd guess the signal from any decoder or digital filter is somehow not reaching the DAC and digital output.
Simon
Hi - I sourced a one Farad cap from my local electronics shop and duly installed it.
I then re-installed the boards and fired it up. No joy!
The new supercap is charging OK, and holding around 3.4V. The circuit board has been cleaned with soapy water and dried, as recommended - thanks to all for the helpful suggestions. So, back to the drawing board.
I'll now start checking the caps on each of the boards in turn, in a process of elimination and measure the voltages from the schema.
I then re-installed the boards and fired it up. No joy!
The new supercap is charging OK, and holding around 3.4V. The circuit board has been cleaned with soapy water and dried, as recommended - thanks to all for the helpful suggestions. So, back to the drawing board.
I'll now start checking the caps on each of the boards in turn, in a process of elimination and measure the voltages from the schema.
Having read the link above it seems a possibility that this cap might somehow "corrupt" the logic. That sounds really vague I know, but I have worked on stuff time and again that "appears" faulty. A favourite trick was to (after making sure all the psu caps are discharged) press tinfoil onto and around the print and components to remove ALL charge from the area. Surprising how many weird faults this cured on various items. The problems mentioned in the link sound a bit more deep seated then that though.
Electronics generally are supremely reliable... you found this duff super cap... it all has to be related... conductive "leftovers", damaged print.
Keep it logical and concentrate around the damaged area.
Electronics generally are supremely reliable... you found this duff super cap... it all has to be related... conductive "leftovers", damaged print.
Keep it logical and concentrate around the damaged area.
As with the PDR-555RW/19RW, the problem will almost certainly turn out to be that leakage from the useless Elna cap has "corrupted" the circuit traces, not the logic. You have to search top & bottom sides of the board under *magnification* for black corrosion spots on traces & discoloration of plate-through holes for at least a 2 inch radius from the cap location. YOU DO NOT NEED TO REPLACE THE CAP. It serves no useful purpose.
I have worked on dozens of PDR-05/04/99, aka HHB CDR-800/Fostex CR200, and almost literally nothing else generally goes wrong with these recorders. So, if it's not working, it's a virtual certainty that it's damage from the stupid Elna cap.
I have worked on dozens of PDR-05/04/99, aka HHB CDR-800/Fostex CR200, and almost literally nothing else generally goes wrong with these recorders. So, if it's not working, it's a virtual certainty that it's damage from the stupid Elna cap.
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
reader instead of an writer
Hi to all,
I am a (un)happy user of an PDR 05. Fantastic machine,however only as a player,I am no longer able to record with it.When I put a new CD(ofcourse for audio)display shows Check disc,and there is some awful noise(like plastic bearings).The very first recordings were fantastic-fantastic machine.
Any hints?
Greetings from Belgrade
Hi to all,
I am a (un)happy user of an PDR 05. Fantastic machine,however only as a player,I am no longer able to record with it.When I put a new CD(ofcourse for audio)display shows Check disc,and there is some awful noise(like plastic bearings).The very first recordings were fantastic-fantastic machine.
Any hints?
Greetings from Belgrade
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