Help! Philips CD80 dead MCU - Page 2

eboy2003 · 5th February 2011, 09:29 PM

If you want to completely follow the service manual, the laser current should be tuned (via 4.7K pot) so that voltage across a 4.7K resistor for HFin to TDA8808 to be 50mV when playing pressed CD.

You should first check the laser current and then fine tune the focus. The laser current can be measured by the voltage across a 12ohm resistor near CDM-1 flex cable plug on servo board. You can tune it up a bit if needed, but over 65mA means your laser is about to end the life.

After the laser current is tuned, the focus can be tuned (via 22K pot) to make FElag pin of TDA8808 to be 400mV +- 40mV.

michael_nipomo · 6th February 2011, 06:41 PM

Thanks everyone. Will go away and try the things you have recommended!! If the Lazer is bad or weak does anyone know where to purchase another?

stephensank · 7th February 2011, 01:59 AM

The laser will not be bad. I have never, ever seen a CDM-1/1mkII laser go bad or even get weak.

michael_nipomo · 9th July 2011, 05:12 PM

You Philips & Marantz CD80 Guru's -- Does anyone out there have any information on the Remote Control for those units? Will the Marantz CD80 Remote Control work with the Philips CD80 CD Player and vice/versa. Does anyone have the Hex Codes for the Remote Controls or could tell us where to get the Hex Codes? Does anyone have an extra remote that they could loan so that we could get the Hex Codes?

Mooly · 9th July 2011, 05:33 PM

Philips/Marantz use RC5 codes for remote control. Any cheapo all in one remote that has preprogrammed audio codes will usually work them OK

michael_nipomo · 9th July 2011, 06:42 PM

One of the additional features of the Philips/Marantz CD80 Remote Control is the Control of the Alps Potentiometer in the CD80. The RC5 Codes do not control Volume. They do control some standard features but not volume nor other features like the Repeat & Random functions. Not being able to go directly from the CD Player to an amplifier is a Major problem for us!!!

9th July 2011, 05:12 PM	#14
michael_nipomo diyAudio Member Join Date: Sep 2006	Philips/Marantz CD80 Remote Control You Philips & Marantz CD80 Guru's -- Does anyone out there have any information on the Remote Control for those units? Will the Marantz CD80 Remote Control work with the Philips CD80 CD Player and vice/versa. Does anyone have the Hex Codes for the Remote Controls or could tell us where to get the Hex Codes? Does anyone have an extra remote that they could loan so that we could get the Hex Codes?

9th July 2011, 05:33 PM	#15
Mooly diyAudio Member Join Date: Sep 2007	Philips/Marantz use RC5 codes for remote control. Any cheapo all in one remote that has preprogrammed audio codes will usually work them OK __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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5th February 2011, 09:29 PM	#11
eboy2003 diyAudio Member Join Date: Oct 2006	If you want to completely follow the service manual, the laser current should be tuned (via 4.7K pot) so that voltage across a 4.7K resistor for HFin to TDA8808 to be 50mV when playing pressed CD. You should first check the laser current and then fine tune the focus. The laser current can be measured by the voltage across a 12ohm resistor near CDM-1 flex cable plug on servo board. You can tune it up a bit if needed, but over 65mA means your laser is about to end the life. After the laser current is tuned, the focus can be tuned (via 22K pot) to make FElag pin of TDA8808 to be 400mV +- 40mV.

6th February 2011, 06:41 PM	#12
michael_nipomo diyAudio Member Join Date: Sep 2006	Thanks everyone. Will go away and try the things you have recommended!! If the Lazer is bad or weak does anyone know where to purchase another?

7th February 2011, 01:59 AM	#13
stephensank diyAudio Member Join Date: Oct 2006	The laser will not be bad. I have never, ever seen a CDM-1/1mkII laser go bad or even get weak.

9th July 2011, 06:42 PM	#16
michael_nipomo diyAudio Member Join Date: Sep 2006	One of the additional features of the Philips/Marantz CD80 Remote Control is the Control of the Alps Potentiometer in the CD80. The RC5 Codes do not control Volume. They do control some standard features but not volume nor other features like the Repeat & Random functions. Not being able to go directly from the CD Player to an amplifier is a Major problem for us!!!

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