Quad 77CD player is a no go

andjur78 · 19th May 2005, 10:32 AM

The unit will not read discs at all. Can anyone help here with service manal or factory alignment procedure?
I suspect it could be a faulty transport??

Not getting much out of IAG yet...

janneman · 19th May 2005, 11:11 AM

Give us some background. What exactly does it do? Has it been working, when did it stop? Did it work when you got it? If you bought it, was it dead? Gurantee?

Jan Didden

audiomatic · 20th May 2005, 10:05 AM

Hello;

the 77CD hasn`t got any adjustment facilities inside. The whole servo circuit is digital. I would suggest to change the Pickup first, this is the main problem which occurs. However QUAD had some problems when releasing the item in the middle 90`s, and so it came that they issued a second release of the servo software. Normally the sofware version is displayed for some seconds after switching the unit on. If not, you may check out the version of your player by dismantling the transport and look for a badge on one of the larger IC`s, such as "QUAD77CD Ver X.XX". You should at least have version 1.9... Earlier versions had various malfunctions.

regards,

audiomatic

andjur78 · 22nd May 2005, 10:51 AM

thanks for your reply audiomatic.
If I load a disc it just sits there the display shows something like
-- -----
There is no loading sound to be heard and the counter will not display any TOC.
I took the transport apart and the small square (MPU?) chip has V2.1. The servo pcb# is 137913A. Assuming it is a faulty pickup do you know what Phillips part that will fit?

audiomatic · 22nd May 2005, 05:38 PM

Hello;

servo software 2.1. should work fine, regarding the pickup I am not sure but I think it must be a CDM 12.4; you should look for a badge at the CD transport.

kind regards, audiomatic

19th May 2005, 10:32 AM	#1
andjur78 diyAudio Member Join Date: Mar 2005 Location: Aussie	Quad 77CD player is a no go The unit will not read discs at all. Can anyone help here with service manal or factory alignment procedure? I suspect it could be a faulty transport?? Not getting much out of IAG yet...

19th May 2005, 11:11 AM	#2
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Give us some background. What exactly does it do? Has it been working, when did it stop? Did it work when you got it? If you bought it, was it dead? Gurantee? Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

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20th May 2005, 10:05 AM	#3
audiomatic diyAudio Member Join Date: Mar 2004 Location: RLP	Hello; the 77CD hasn`t got any adjustment facilities inside. The whole servo circuit is digital. I would suggest to change the Pickup first, this is the main problem which occurs. However QUAD had some problems when releasing the item in the middle 90`s, and so it came that they issued a second release of the servo software. Normally the sofware version is displayed for some seconds after switching the unit on. If not, you may check out the version of your player by dismantling the transport and look for a badge on one of the larger IC`s, such as "QUAD77CD Ver X.XX". You should at least have version 1.9... Earlier versions had various malfunctions. regards, audiomatic

22nd May 2005, 10:51 AM	#4
andjur78 diyAudio Member Join Date: Mar 2005 Location: Aussie	thanks for your reply audiomatic. If I load a disc it just sits there the display shows something like -- ----- There is no loading sound to be heard and the counter will not display any TOC. I took the transport apart and the small square (MPU?) chip has V2.1. The servo pcb# is 137913A. Assuming it is a faulty pickup do you know what Phillips part that will fit?

22nd May 2005, 05:38 PM	#5
audiomatic diyAudio Member Join Date: Mar 2004 Location: RLP	Hello; servo software 2.1. should work fine, regarding the pickup I am not sure but I think it must be a CDM 12.4; you should look for a badge at the CD transport. kind regards, audiomatic

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