Don't think the CDM12.1 has a solder blob shorting link. Philips didn't seem to use them
The 12.1 if a Philips one came with a clip on the end of the Ribbon 'shorting' all pins together to prevent static damage. See this pic.............
https://www.amazon.co.uk/VAM1202-Philips-Mechanism-Complete-Traverse-Black/dp/B00F94SW7A
The Chinese copies often don't come with any protection.
Double check the Platter Height compared to the original. I have found some 'copies' to have a very different height.
Why the original doesn't work any more is a bit more of a mystery.
If you weren't 'Anti-Stat'd' up when fitting the Laser then you could have damaged one or more IC's in the Player. I'd start with the RF AMplifier IC (possibly a TDA1302 (?))
The Manual is here............
Marantz CD-17 - Manual - Compact Disc Player - HiFi Engine
The 12.1 if a Philips one came with a clip on the end of the Ribbon 'shorting' all pins together to prevent static damage. See this pic.............
https://www.amazon.co.uk/VAM1202-Philips-Mechanism-Complete-Traverse-Black/dp/B00F94SW7A
The Chinese copies often don't come with any protection.
Double check the Platter Height compared to the original. I have found some 'copies' to have a very different height.
Why the original doesn't work any more is a bit more of a mystery.
If you weren't 'Anti-Stat'd' up when fitting the Laser then you could have damaged one or more IC's in the Player. I'd start with the RF AMplifier IC (possibly a TDA1302 (?))
The Manual is here............
Marantz CD-17 - Manual - Compact Disc Player - HiFi Engine
Hi perciva1007,
You're right. The later VAM might have used solder. Philips used a large "paper clip" to short across the bottom contacts on the flexible pcb.
I have never seen a blown servo or RF amp IC on a Philips. Doesn't mean it can't happen, but it's pretty rare unless you are in a very dry climate (I guess).
-Chris
You're right. The later VAM might have used solder. Philips used a large "paper clip" to short across the bottom contacts on the flexible pcb.
I have never seen a blown servo or RF amp IC on a Philips. Doesn't mean it can't happen, but it's pretty rare unless you are in a very dry climate (I guess).
-Chris
Just a thought, can the servo be damaged/blown if the solder blob was still in place and the unit powered up??
Cheers George
Cheers George
I've kept reading this thread as its gone along and unfortunately it does have all the hallmarks of 'a repair gone wrong'... however,
Right at the start of the thread you mention that the player did actually work on some discs with the old pickup fitted... then a technician fitted your replacement pickup... and now it does nothing, not even going into service mode.
I'm not familiar with this player but a few thoughts:
1/ The old pickup should have been refitted to confirm that the machine behaved as before. i.e to make sure no 'new' fault has been accidently introduced and/or to confirm the new pickup was actually faulty.
2/ Not going into service mode. The procedure of button presses and power application has to be followed exactly. It would be an unusual problem for this (not going into service mode) to be a 'real fault' but if it is then it suggests that something untoward has happened.
3/ I haven't seen mention of the most basic 'first line' checks when confronted with a player that wont read a disc.
(1) Does the lens perform a focus search routine when the drawer is closed and with no disc present ? You should see the lens move rapidly up and down 3 or 4 times.
(2) During this focus search routine, does the lens emit light ? Looked at from slightly off centre and at a distance of at least 30cm you should see a faint pinprick of dull red light. Its not always easy to see... and don't stare directly into the lens at close range. You will only see light for the couple of seconds the lens is moving up and down.
Right at the start of the thread you mention that the player did actually work on some discs with the old pickup fitted... then a technician fitted your replacement pickup... and now it does nothing, not even going into service mode.
I'm not familiar with this player but a few thoughts:
1/ The old pickup should have been refitted to confirm that the machine behaved as before. i.e to make sure no 'new' fault has been accidently introduced and/or to confirm the new pickup was actually faulty.
2/ Not going into service mode. The procedure of button presses and power application has to be followed exactly. It would be an unusual problem for this (not going into service mode) to be a 'real fault' but if it is then it suggests that something untoward has happened.
3/ I haven't seen mention of the most basic 'first line' checks when confronted with a player that wont read a disc.
(1) Does the lens perform a focus search routine when the drawer is closed and with no disc present ? You should see the lens move rapidly up and down 3 or 4 times.
(2) During this focus search routine, does the lens emit light ? Looked at from slightly off centre and at a distance of at least 30cm you should see a faint pinprick of dull red light. Its not always easy to see... and don't stare directly into the lens at close range. You will only see light for the couple of seconds the lens is moving up and down.
both new and old lens do not perform focus search,thought it might be the ribbon connecting lazor unit to pcb a fiddly connection to fit
Henry
Henry
Quote from very first post...............
''...............Put the old lazer back now it does not read..................''
Thanks for pointing that out 🙂 That's my mistake... oops, and I've kept looking at the thread over the last few days.
OK, so a man made fault has been introduced somewhere... the basic checks remain valid though.
OK, so a man made fault has been introduced somewhere... the basic checks remain valid though.
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