SONY SCD 777ES locked up

peteblakejr · 9th July 2009, 04:42 PM

Does anybody know of a way to reset the controls on a SONY SCD 777ES? I put in a CD-R that had played fine before and the display said "unreadable" then when I tried to eject (remove) the disc the top loading door cannot open. Tried unplugging and plugging back in but no change. PLEASE help - I miss my player!

QSerraTico_Tico · 9th July 2009, 05:04 PM

Quote:

Originally posted by peteblakejr
Does anybody know of a way to reset the controls on a SONY SCD 777ES? I put in a CD-R that had played fine before and the display said "unreadable" then when I tried to eject (remove) the disc the top loading door cannot open. Tried unplugging and plugging back in but no change. PLEASE help - I miss my player!

Get the service manual in order to know how to put it in service mode.

Mooly · 9th July 2009, 05:49 PM

This works very often if your absolutely sure it's electrically locked up .... or knob-locked as we used to call it. First check for a backup supply to the main microprocessor... it may or may not have one, usually derived from a coin type cap. If it has discharge it slowly via a resistor. Check for residual voltage across ALL the main rails and discharge them if needed.
And then... seriously, but you have to be 100% sure there are no caps left charged up, such as to the FL display etc etc, THEN AND ONLY THEN, take some aluminium foil and press it over the whole PCB around the microprocessor and system control IC's and leave it for several minutes.
It's not madness, it's a workshop technique that can "fix" many problems like this. IC's can lock up and slight residual charge stops them reseting correctly when you keep powering it up. We are talking voltages in the 10's of millivolts here.
BUT YOU HAVE TO DO IT RIGHT.
Alternatively you can leave it for 24 to 72 hours and just see what happens.

peteblakejr · 10th July 2009, 07:58 PM

discharging all the capacitors sounds scary as I have no real electronics tech knowledge. I will try to find a service manual i guess. Thanks for your help

aparatusonitus · 11th July 2009, 02:12 AM

Quote:

Originally posted by peteblakejr
I will try to find a service manual i guess.

You can download service manual for free from http://www.hifiengine.com/manuals/sony/scd-777es.shtml
but first you have to register.

peteblakejr · 11th July 2009, 01:19 PM

I found a copy of the service manual and did the section 5 TEST MODE routine. All did what it was supposed to and thus got the display readout indicating "the key check terminated successfully" but player still has the same problem... I cannot understand the manual well enough to decide if I should try the "ADJUSTMENT MODES" - I removed the CD-R and the weight/puck when I took the top off as required to short the two terminal to get into the TEST MODE... no idea what to do now... display just reads "CLOSE" or blinking "UNLOADING"

fas948 · 15th July 2009, 09:35 AM

Test the 3 fuses on the power supply, it very likely that one of them is bad. These fuses are for the digital power section.

peteblakejr · 18th July 2009, 04:59 PM

Quote:

Originally posted by fas948
Test the 3 fuses on the power supply, it very likely that one of them is bad. These fuses are for the digital power section.

Just got your message. Thanks a lot! I'll check the fuses and let you know what I find...

peteblakejr · 18th July 2009, 05:00 PM

How did you know that? I don't have a replacement fuse yet to confirm fix but the fuse furthest of the 3 from the transformer is broken. Will advise further. Thank you, thank you!!!!

fas948 · 20th July 2009, 03:08 PM

“How did you know that?”

I have good technical understanding for these models (SCD-1/SCD-777es), these are the best players Sony has ever build and with the proper modifications they can sound better than any player costing over 10K.

9th July 2009, 04:42 PM	#1
peteblakejr diyAudio Member Join Date: Jul 2009	SONY SCD 777ES locked up Does anybody know of a way to reset the controls on a SONY SCD 777ES? I put in a CD-R that had played fine before and the display said "unreadable" then when I tried to eject (remove) the disc the top loading door cannot open. Tried unplugging and plugging back in but no change. PLEASE help - I miss my player!

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9th July 2009, 05:49 PM	#3
Mooly diyAudio Member Join Date: Sep 2007	This works very often if your absolutely sure it's electrically locked up .... or knob-locked as we used to call it. First check for a backup supply to the main microprocessor... it may or may not have one, usually derived from a coin type cap. If it has discharge it slowly via a resistor. Check for residual voltage across ALL the main rails and discharge them if needed. And then... seriously, but you have to be 100% sure there are no caps left charged up, such as to the FL display etc etc, THEN AND ONLY THEN, take some aluminium foil and press it over the whole PCB around the microprocessor and system control IC's and leave it for several minutes. It's not madness, it's a workshop technique that can "fix" many problems like this. IC's can lock up and slight residual charge stops them reseting correctly when you keep powering it up. We are talking voltages in the 10's of millivolts here. BUT YOU HAVE TO DO IT RIGHT. Alternatively you can leave it for 24 to 72 hours and just see what happens.

10th July 2009, 07:58 PM	#4
peteblakejr diyAudio Member Join Date: Jul 2009	discharging all the capacitors sounds scary as I have no real electronics tech knowledge. I will try to find a service manual i guess. Thanks for your help

11th July 2009, 01:19 PM	#6
peteblakejr diyAudio Member Join Date: Jul 2009	I found a copy of the service manual and did the section 5 TEST MODE routine. All did what it was supposed to and thus got the display readout indicating "the key check terminated successfully" but player still has the same problem... I cannot understand the manual well enough to decide if I should try the "ADJUSTMENT MODES" - I removed the CD-R and the weight/puck when I took the top off as required to short the two terminal to get into the TEST MODE... no idea what to do now... display just reads "CLOSE" or blinking "UNLOADING"

15th July 2009, 09:35 AM	#7
fas948 diyAudio Member Join Date: Jun 2009	Test the 3 fuses on the power supply, it very likely that one of them is bad. These fuses are for the digital power section.

18th July 2009, 05:00 PM	#9
peteblakejr diyAudio Member Join Date: Jul 2009	How did you know that? I don't have a replacement fuse yet to confirm fix but the fuse furthest of the 3 from the transformer is broken. Will advise further. Thank you, thank you!!!!

20th July 2009, 03:08 PM	#10
fas948 diyAudio Member Join Date: Jun 2009	“How did you know that?” I have good technical understanding for these models (SCD-1/SCD-777es), these are the best players Sony has ever build and with the proper modifications they can sound better than any player costing over 10K.

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