I just replace capacitors on the board after I finished it. It won't function. Even I put all old capacitors back to the board, it still not function and display show "00"
I replace all IC on the board but display still show "00" again.
Can anyone help me please?
I replace all IC on the board but display still show "00" again.
Can anyone help me please?
If it was working OK before you started replacing caps then it has to be something you have done. Check for solder splashes etc. Check all the rails are correct too.
Once you start replacing IC's in the hope of fixing it then there becomes a lot of room for error. Far better to look carefully at the original non-working state and make careful checks.
Once you start replacing IC's in the hope of fixing it then there becomes a lot of room for error. Far better to look carefully at the original non-working state and make careful checks.
Thank you Mooly, I have replace all capacitors back to the board it still show 00 Display. So I replace main 2 IC on board but result is the same. I would like to try resetting micro controller. It is in pin 38. However I don't know how to reset it. Anyone have experience to resetting micro controller.
The uP will be reset at each power on cycle. You need to look at the reset pin on a scope to verify correct operation but I think ultimately you have to accept that this is a problem that has been caused by working on the unit. As long as no overvolt conditions occur on any of the IC's (and any of their pins) then there is no reason to suspect any IC as being the problem.
I don't know why I just replace ceramic and polyester capacitor which are non polarized to Polypropylene which are also non polarized. The 00 in display show. I check the closing switch on CD drive it work normal. What is the 00 means?
It will be some fault code preprogrammed into the uP. A first step would be to go around every pin on the uP with a scope and DVM and check that every single pin has what is expected present.
You have to accept that this is a man made fault and as such could be anything 🙂 So you have to check every single pin on that uP to see if you can identify any problem... and even then you may not. There could be a problem with the data on the I2C bus which apart from checking for the presence of activity is not something you can fully check.
You have to accept that this is a man made fault and as such could be anything 🙂 So you have to check every single pin on that uP to see if you can identify any problem... and even then you may not. There could be a problem with the data on the I2C bus which apart from checking for the presence of activity is not something you can fully check.
Dear Mooly,
I wrote the E-mail to BWusa. They told me that "00" status is the CD loading state. I don't know why CD still remains in "Loading State" even the CD tray closing switch is work fine (I checked it). I think reset microcontroller would help but I don't know how to reset it. It is pin no. 38. Please advice. Thank you very much Mooly
I wrote the E-mail to BWusa. They told me that "00" status is the CD loading state. I don't know why CD still remains in "Loading State" even the CD tray closing switch is work fine (I checked it). I think reset microcontroller would help but I don't know how to reset it. It is pin no. 38. Please advice. Thank you very much Mooly
Hi, again mooly
The chip Sony CXP82440A uP has reset pin no. 38 the pdf file of it state that
"Reset pin specifies the input current when pull-up resistance has been selected; leakage current when no resistance has been selected. PB7 does not specify the leakage current because it’s only for output"
I don't know how to reset it. Please help me
The chip Sony CXP82440A uP has reset pin no. 38 the pdf file of it state that
"Reset pin specifies the input current when pull-up resistance has been selected; leakage current when no resistance has been selected. PB7 does not specify the leakage current because it’s only for output"
I don't know how to reset it. Please help me
Hi,
First normally the reset of a micro it is held down for few seconds and then the reset should goes high. Check to make sure it is high. Momentary ground the reset pin and if everything it is OKAY then system should come up. You have to be careful because some micro used a a resonator as oscillator and it looked like a capacitor. Check it make sure you didn't confuse it with a capacitor and replace it thinking that it is a capacitor.
First normally the reset of a micro it is held down for few seconds and then the reset should goes high. Check to make sure it is high. Momentary ground the reset pin and if everything it is OKAY then system should come up. You have to be careful because some micro used a a resonator as oscillator and it looked like a capacitor. Check it make sure you didn't confuse it with a capacitor and replace it thinking that it is a capacitor.
Hi Tauro0221,
Thank you very much for your comment. When I replaced capacitors I have check with service manual. All of them are capacitors. It is unbelievable that changing capacitors damage the CD player. I have to check the circuit again carefully whether the circuit route were cut off.
Thank you very much for your comment. When I replaced capacitors I have check with service manual. All of them are capacitors. It is unbelievable that changing capacitors damage the CD player. I have to check the circuit again carefully whether the circuit route were cut off.
The uP has no non volatile memory so it gets reset on each power on cycle. You can't reset it any more than that. Its not like where there is a battery or cap maintaining memory and logic can get corrupted. It starts fresh and reset each time.
I have tried resetting uP but 00 display is only temporary disappear and appear again. I have no idea how to fixed it. Can anyone suggest?
It maybe just the loose ribbon cable from Laser to main board. Ensure all wires are pushed in properly. I had this problem on my Rcd991 and just pushed all wires in firmly.
Cheers
Cheers
Even I recheck the ribbon cable. There is no loose or broken.
Result is the same, it still show 00 display.
Result is the same, it still show 00 display.
What are the step of CD function? Do the motor have to spin first and then len will move to read the header? My CD won't spin I am not sure that the chip LB1641 has some problem?
The CD (mech) has to load correctly with all the tray microswitches giving the correct inputs to the uP. After that "focus search" is performed. This is where the laser lights and the lens bobs up and down 3 or so times. The disc is stationary at this point because its easier to focus on a still rather than moving object. If focus is found the "FOK" or focus OK signal tells the uP (or system control) to spin the disc to approximately the right speed. As that happens the servos extract the clock info from the disc and the disc servo locks onto the correct speed.
Ok, try this:
- Turn the power off.
- Unplug your RCD-971 player (AC power cord) from the wall (or power bar).
- Turn the player upside down (resting on its top).
- Under the disc tray, look near the very front, there is a small hole; and in that hole there is a screw.
- Turn that screw slightly (a quarter turn) into one direction (remember the direction).
- Replug your player and check.
* If you still see the "00" display error, redo the steps above but turn back the screw where it was previously, and this time turn it a quarter way in the opposite direction.
{If needed to, make that quarter turn into either direction a half turn.}
Are you following me? ...Then let us know your result.
- Turn the power off.
- Unplug your RCD-971 player (AC power cord) from the wall (or power bar).
- Turn the player upside down (resting on its top).
- Under the disc tray, look near the very front, there is a small hole; and in that hole there is a screw.
- Turn that screw slightly (a quarter turn) into one direction (remember the direction).
- Replug your player and check.
* If you still see the "00" display error, redo the steps above but turn back the screw where it was previously, and this time turn it a quarter way in the opposite direction.
{If needed to, make that quarter turn into either direction a half turn.}
Are you following me? ...Then let us know your result.
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