Think I blew it replacing laser unit

kora · 4th June 2005, 03:42 PM

Replaced the laser unit (Philips VAM 1201) of a troubled Marantz 4000 today. It's my first attempt.
When powered on the display says READING then OPEN and the drawer opens; when made to close, the display says READING, then OPEN again and the drawer re-opens. Inserting a CD has no effect on this behaviour.
I've rechecked the wiring and connectors several times, and used antistatic procedures throughout. Could I have damaged something eg. laser motor when soldering?

Netlist · 4th June 2005, 03:52 PM

Are you sure the tray is well in place? On some laser units one has to remove a solder bridge to make it work, forgot about the 1201 though.

/Hugo

kora · 4th June 2005, 05:26 PM

You've given me a slim hope, netlist, that it may not be a disaster. The tray in fact doesn't look as if it lines up properly at the back when closed, as if it's on the wrong cog. When I was dismantling it, before I discovered that the front lip of the tray just slides up and off to allow the whole unit to be removed backwards, I'd been following someone's experiences with a Marantz CD63 and trying to release the tray by pulling it straight out, and wondering why I couldn't find the drawer stop. I might have dislodged it then. I'll let you know how I get on, and thanks.

Netlist · 4th June 2005, 05:30 PM

Bu all means take your time. Some trays can be very tricky to reassemble.

/Hugo

richie00boy · 4th June 2005, 05:47 PM

Sorry to hijack, but have you seen my thread in this forum? My (quite expensive, to me) Marantz DVD player is playing up. I'm desperate for help.

kora · 5th June 2005, 12:27 AM

You wouldn't want my advice richie00boy, but you have my sympathy.

As for my problem, I'm pretty sure the tray is out of place on its tracks and needs to move 5 or 6mm backwards, but I can't as yet find a way of doing it by adjustment rather than force. I'll fiddle on, and hope for inspiration.

kora · 5th June 2005, 09:34 AM

Take a bow, netlist. I forced the tray off its tracks a few times and altered its starting position on the main cog and finally got it to close the whole way. Reads and plays like new! Now I can afford to orgy.

Netlist · 5th June 2005, 04:30 PM

/Hugo

4th June 2005, 03:42 PM	#1
kora diyAudio Member Join Date: May 2005 Location: On a hill	Think I blew it replacing laser unit Replaced the laser unit (Philips VAM 1201) of a troubled Marantz 4000 today. It's my first attempt. When powered on the display says READING then OPEN and the drawer opens; when made to close, the display says READING, then OPEN again and the drawer re-opens. Inserting a CD has no effect on this behaviour. I've rechecked the wiring and connectors several times, and used antistatic procedures throughout. Could I have damaged something eg. laser motor when soldering?

4th June 2005, 05:47 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Sorry to hijack, but have you seen my thread in this forum? My (quite expensive, to me) Marantz DVD player is playing up. I'm desperate for help. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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4th June 2005, 03:52 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Are you sure the tray is well in place? On some laser units one has to remove a solder bridge to make it work, forgot about the 1201 though. /Hugo

4th June 2005, 05:26 PM	#3
kora diyAudio Member Join Date: May 2005 Location: On a hill	You've given me a slim hope, netlist, that it may not be a disaster. The tray in fact doesn't look as if it lines up properly at the back when closed, as if it's on the wrong cog. When I was dismantling it, before I discovered that the front lip of the tray just slides up and off to allow the whole unit to be removed backwards, I'd been following someone's experiences with a Marantz CD63 and trying to release the tray by pulling it straight out, and wondering why I couldn't find the drawer stop. I might have dislodged it then. I'll let you know how I get on, and thanks.

4th June 2005, 05:30 PM	#4
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Bu all means take your time. Some trays can be very tricky to reassemble. /Hugo

5th June 2005, 12:27 AM	#6
kora diyAudio Member Join Date: May 2005 Location: On a hill	You wouldn't want my advice richie00boy, but you have my sympathy. As for my problem, I'm pretty sure the tray is out of place on its tracks and needs to move 5 or 6mm backwards, but I can't as yet find a way of doing it by adjustment rather than force. I'll fiddle on, and hope for inspiration.

5th June 2005, 09:34 AM	#7
kora diyAudio Member Join Date: May 2005 Location: On a hill	Take a bow, netlist. I forced the tray off its tracks a few times and altered its starting position on the main cog and finally got it to close the whole way. Reads and plays like new! Now I can afford to orgy.

5th June 2005, 04:30 PM	#8
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	/Hugo