Good morning,
I bought this CD player to repair it, and I will briefly tell you its story, as I rebuilt it.
The CD was working fine until it stopped reading. The previous owner bought a new pickup, installed it, but he did not realize that he doesn't remove the "jumper" soldered to protect the optical pickup from electrostatic discharges. Not seeing a positive results, the previous owner, he mistakenly thought it could be cold welds or cracked by time. Here he made a total disaster .... he took the soldering iron and went over all the pins of the microcontrollers without using flux or anything else. End result: he reassembled everything without realizing he had short circuits and turned on the player, blew a fuse and threw in the towel. : evil:: evil:: evil:
So when the Denon arrived to me, nothing worked. Time to make a long diagnosis to notice the short-circuited pins, I took the flux, the magnifying glass, and with a lot of patience I restored all the soldering on the pins of the 2 microcontrollers. The work was very decisive in fact the cd player finally turned on again 🙂. Then I removed the tin jumper on the optical pickup, but to my sad surprise the player still can't read CDs.
When i turned on, the word DISC appears for a few seconds, and then disappears, and all the mechanics do not respond (the drawer does not open / close, the disc does not turn even if loaded by hand, and the pickup does not even try to find the CD). If, on the other hand, I put the USB mode on the front panel, I turn it off and on again, the drawer opens and closes with the button, but the reader continues to not read anything, the disk does not spin anyway and the USB detects them but does not read it. .. nothing more.
If I enter, with a combination of keys, in the diagnostic mode of the reader and launch any test, the display gives me the following error: E4-05. The service_manual shows E4-05: "Decoder bus error (Error in communications with CD decoder)"
Now I don't know how to proceed anymore. I did a check of all the components with the multimeter (diodes, smd capacitors, resistors etc ...) and everything is ok. I have also checked the main voltages and they are in line with the datasheet.
What do you suggest ??
I enclose service manual:
https://www.vintageshifi.com/repert...ge.php?pdf=Denon-DCD-710AE-Service-Manual.pdf
I bought this CD player to repair it, and I will briefly tell you its story, as I rebuilt it.
The CD was working fine until it stopped reading. The previous owner bought a new pickup, installed it, but he did not realize that he doesn't remove the "jumper" soldered to protect the optical pickup from electrostatic discharges. Not seeing a positive results, the previous owner, he mistakenly thought it could be cold welds or cracked by time. Here he made a total disaster .... he took the soldering iron and went over all the pins of the microcontrollers without using flux or anything else. End result: he reassembled everything without realizing he had short circuits and turned on the player, blew a fuse and threw in the towel. : evil:: evil:: evil:
So when the Denon arrived to me, nothing worked. Time to make a long diagnosis to notice the short-circuited pins, I took the flux, the magnifying glass, and with a lot of patience I restored all the soldering on the pins of the 2 microcontrollers. The work was very decisive in fact the cd player finally turned on again 🙂. Then I removed the tin jumper on the optical pickup, but to my sad surprise the player still can't read CDs.
When i turned on, the word DISC appears for a few seconds, and then disappears, and all the mechanics do not respond (the drawer does not open / close, the disc does not turn even if loaded by hand, and the pickup does not even try to find the CD). If, on the other hand, I put the USB mode on the front panel, I turn it off and on again, the drawer opens and closes with the button, but the reader continues to not read anything, the disk does not spin anyway and the USB detects them but does not read it. .. nothing more.
If I enter, with a combination of keys, in the diagnostic mode of the reader and launch any test, the display gives me the following error: E4-05. The service_manual shows E4-05: "Decoder bus error (Error in communications with CD decoder)"
Now I don't know how to proceed anymore. I did a check of all the components with the multimeter (diodes, smd capacitors, resistors etc ...) and everything is ok. I have also checked the main voltages and they are in line with the datasheet.
What do you suggest ??
I enclose service manual:
https://www.vintageshifi.com/repert...ge.php?pdf=Denon-DCD-710AE-Service-Manual.pdf
Hi!
I have the same Denon model with exatcly the same problem. I also checked all of the elements but didn't find anything damaged. Everything looks ok. Have you found any solution or made any progress?
I have the same Denon model with exatcly the same problem. I also checked all of the elements but didn't find anything damaged. Everything looks ok. Have you found any solution or made any progress?
Hi guys!
I have the same Denon CD player with the same issue (E4-05 Error in communications with cd decoder). The drawer it opens and close it sometimes but the laser is not moving. The USB drives are detected, the song is displayed properly but is not playing, it stays forever with 00:00
I've checked all the voltages and everything looks good, didn't see any problem.
Some service engineers told me that the Firmware might be corrupted, but not 100% sure. I've tried to update the firmware but I can't find any USB firmware online. Did you find any workaround or managed to fix it?
Thanks.
I have the same Denon CD player with the same issue (E4-05 Error in communications with cd decoder). The drawer it opens and close it sometimes but the laser is not moving. The USB drives are detected, the song is displayed properly but is not playing, it stays forever with 00:00
I've checked all the voltages and everything looks good, didn't see any problem.
Some service engineers told me that the Firmware might be corrupted, but not 100% sure. I've tried to update the firmware but I can't find any USB firmware online. Did you find any workaround or managed to fix it?
Thanks.
Hello
In my case it turned out that only IC38 TC7WHU04 was damaged.
After the replacement, my cd player started to work and it reads music from cd and usb properly.
In my case it turned out that only IC38 TC7WHU04 was damaged.
After the replacement, my cd player started to work and it reads music from cd and usb properly.
Hi, I have a Marantz SA8005 with a similar problem. Mech completely dead and front panel very slow to react to input change. Service manual shows it has several of these ICs, how did you diagnose the IC as faulty and how can I determine which one is the cause?
Cheers
Steve
Cheers
Steve
maybe it's the same problem as my old DENON DCD-710. Can you describe the problem better, and can you provide a service manual? Anyway, identify them and start checking with the 10X attenuation oscilloscope if you can see all the clock signals in the CD player. In particular the clock signal for the chip responsible for managing the interface.
Hi!
I know its old discussion, but help needed. Same problems with the CD player. I got the whole set PMA710, DCD710 and TU1510. Unfortunately, CD player does not work. It turns on and thats pretty much all. If I put the pen drive in the slot, then it would open the CD drawer, sometimes🥴. I see someone wrote the faulty part ( IC38 TC7WHU04 ). Can someone help locate it? I have downloaded service manual, but could not locate the part. Is it a big deal replacing it? Thanks a lot in advance. I hope i can fix it.
I know its old discussion, but help needed. Same problems with the CD player. I got the whole set PMA710, DCD710 and TU1510. Unfortunately, CD player does not work. It turns on and thats pretty much all. If I put the pen drive in the slot, then it would open the CD drawer, sometimes🥴. I see someone wrote the faulty part ( IC38 TC7WHU04 ). Can someone help locate it? I have downloaded service manual, but could not locate the part. Is it a big deal replacing it? Thanks a lot in advance. I hope i can fix it.
Thank you so much for sharing this solution. I had exactly the same problem with a Denon DCD-710AE and I located IC38. Used a simple multimeter to test it and it had shortcut! So ordered new TC7WHU04 at Mouser. Did my first de-solder of a SMD SM8 chip (quite tricky with the flux and all) and soldered in the new chip.
And it worked like magic!! This CD player will make its owner very happy for hours of playing time to come. I like the pitch speed control on this machine by the way!
