Hi,
I have a problem with a Marantz CD67. Initial symptom is that after loading a CD, "dISC" flashes a couple of times then remains on display - CD is not read.
Investigations:
Service Mode:
Mode 0 - cue/review keys both move the sled towards the outside of the disk while held down. releasing the keys sends the sled back to the centre of the disk.
Mode 1 - focus servo is operational.
Mode 2 - spindle does not rotate. (though 4.77 volts is applied to the spindle motor (measured at the circuit board connector - yellow/green wires, pins 3 & 4).
Mode 3 - sled moves towards the outside of the disc. Can be reversed with the cue/review keys. At either end of its travel, it keeps pushing at the end stops causing mechanical clicking, sounds like the screw drive pin ratcheting against the cog which cannot rotate any further.
Pressing play activates the focus servo. Without a disk loaded, "err 2" - FOCUS error - is shown (to be expected, I presume). With a disc loaded, I get "err 10" - RADIAL error. (Why not spindle error?)
I also confirmed that the spindle voltage is applied in normal operation, when loading a disk - it rises quickly but gives up after a second or two, falling back to zero. A mobile phone video shows the laser is working.
After disassembly, I applied 3 volts across the motor terminals from a couple of AAA cells. The sled and draw motors turn, the spindle motor doesn't. Turning by hand, it seems stiff. The resistance across the spindle motor terminals is about 2 ohms at rest, varies when turning by hand.
I considered trying to swap the drawer and spindle motors (they look the same), but couldn't work out how to separate the CD carrier from the spindle without risking its complete destruction.
So, is this simply a failed motor? If so can anything be done to fix it, or do I need to replace the laser mechanism (a new laser wouldn't be a bad thing, given a nearly 30 year old machine, but I understand there can be quality control problems with available 3rd party laser assemblies).
Or could the problem be deeper - in the servo board/logic?
Thanks for any advice.
I have a problem with a Marantz CD67. Initial symptom is that after loading a CD, "dISC" flashes a couple of times then remains on display - CD is not read.
Investigations:
Service Mode:
Mode 0 - cue/review keys both move the sled towards the outside of the disk while held down. releasing the keys sends the sled back to the centre of the disk.
Mode 1 - focus servo is operational.
Mode 2 - spindle does not rotate. (though 4.77 volts is applied to the spindle motor (measured at the circuit board connector - yellow/green wires, pins 3 & 4).
Mode 3 - sled moves towards the outside of the disc. Can be reversed with the cue/review keys. At either end of its travel, it keeps pushing at the end stops causing mechanical clicking, sounds like the screw drive pin ratcheting against the cog which cannot rotate any further.
Pressing play activates the focus servo. Without a disk loaded, "err 2" - FOCUS error - is shown (to be expected, I presume). With a disc loaded, I get "err 10" - RADIAL error. (Why not spindle error?)
I also confirmed that the spindle voltage is applied in normal operation, when loading a disk - it rises quickly but gives up after a second or two, falling back to zero. A mobile phone video shows the laser is working.
After disassembly, I applied 3 volts across the motor terminals from a couple of AAA cells. The sled and draw motors turn, the spindle motor doesn't. Turning by hand, it seems stiff. The resistance across the spindle motor terminals is about 2 ohms at rest, varies when turning by hand.
I considered trying to swap the drawer and spindle motors (they look the same), but couldn't work out how to separate the CD carrier from the spindle without risking its complete destruction.
So, is this simply a failed motor? If so can anything be done to fix it, or do I need to replace the laser mechanism (a new laser wouldn't be a bad thing, given a nearly 30 year old machine, but I understand there can be quality control problems with available 3rd party laser assemblies).
Or could the problem be deeper - in the servo board/logic?
Thanks for any advice.
Spindle Motors as a general rule should measure approx 10 ohms across terminals, and stay around that number as you rotate the shaft slowly.
2 ohms is too low IMHO
2 ohms is too low IMHO
Thanks. My mistake here:
With the motor disconnected, the resistance fluctuates between about 12 and 50 ohms, without moving the shaft. Connected to the board, powered off, it measures stable, about 12 ohms, on the board connector plug. The 2 ohm measurement I posted last night was across the board connector plug with the board powered on.
With the motor disconnected, the resistance fluctuates between about 12 and 50 ohms, without moving the shaft. Connected to the board, powered off, it measures stable, about 12 ohms, on the board connector plug. The 2 ohm measurement I posted last night was across the board connector plug with the board powered on.
You can try to spray in some contact cleaner, if you can find any holes on the motor body. Then turn it by hand, and lastly apply 3V from batteries and let it spin in both directions.
For CDM4 turntable motors, I even briefly apply 9V in both directions. Soak the motor in contact cleaner spray.
Thanks for all your replies. I tried the contact cleaner - no change, though I didn't try 9 volts. The motor is very stiff, I think it is destroyed inside. I got hold of another mechanism from an old Philips player and this resolved the problem (I had to perform surgery on the wiring loom - the Philips one was too short and had a different board connector).
After fixing the mechanism, I found there was no output on the right phono output (headphone output was fine). I found a crack in the PCB track at C658 so added a little jumper cable to R658. The player is now working well.
I had just got this player from a seller on eBay. I think the courier (Evri) must have been using the carton for rugby practice at their distribution centre.
After fixing the mechanism, I found there was no output on the right phono output (headphone output was fine). I found a crack in the PCB track at C658 so added a little jumper cable to R658. The player is now working well.
I had just got this player from a seller on eBay. I think the courier (Evri) must have been using the carton for rugby practice at their distribution centre.
It turns out this story is not quite over:
Concerned that something was not quite compatible with the mechanism I transplanted from a Philips CD713 (unlike in the donor player, CDRs did not play), for £14 I ordered a "new" mechanism on eBay. It arrived today. It didn't look new, and it had Philips branding on the frame. I'm guessing it was a (not particularly) refurbished item - the ribbon connector terminals looked used and a bit corroded, and more importantly, there was a dimple in the ribbon cable/laser PCB extension, with one of the tracks exposed. It mostly worked, including with CDRs, but there was occasional muting (without losing it's place in the track). It's going back.
Meanwhile I've been looking at the original mechanism with the non-working spindle motor. With nothing to lose, I decided to lever off the platter and surprised myself by not cracking or bending anything. With the platter off, I noticed the rotor seemed a lot freer. And sure enough, a 3 volt supply got it spinning. Snapping the platter back on made it non-functional again, so off with the platter again, then replaced it more carefully, not going beyond the first point of resistance.
Success. So I put the original mechanism back in the player, and hey presto, it's working. CDRs as well. Noisier than the alternative mechanisms during loading and seeking though (I think the sled mechanism is the cause), but almost silent during playback, even with the lid off.
How the platter got compacted onto the spindle during delivery to me is a complete mystery. Perhaps the seller hadn't told me everything. But I got a partial refund which I'm happy with.
So why the minor incompatibilities? I think it could be in the clamping arrangements, which certainly differ between the Marantz CD63 and the Philips CD713, though it all seemed to fit together mechanically. Or slightly different control signals during error correction? I don't know, really. The original mechanism is CDM12.1/15, the one from the Philips player is VAM1201/11 and the eBay special is VAM1202.
Concerned that something was not quite compatible with the mechanism I transplanted from a Philips CD713 (unlike in the donor player, CDRs did not play), for £14 I ordered a "new" mechanism on eBay. It arrived today. It didn't look new, and it had Philips branding on the frame. I'm guessing it was a (not particularly) refurbished item - the ribbon connector terminals looked used and a bit corroded, and more importantly, there was a dimple in the ribbon cable/laser PCB extension, with one of the tracks exposed. It mostly worked, including with CDRs, but there was occasional muting (without losing it's place in the track). It's going back.
Meanwhile I've been looking at the original mechanism with the non-working spindle motor. With nothing to lose, I decided to lever off the platter and surprised myself by not cracking or bending anything. With the platter off, I noticed the rotor seemed a lot freer. And sure enough, a 3 volt supply got it spinning. Snapping the platter back on made it non-functional again, so off with the platter again, then replaced it more carefully, not going beyond the first point of resistance.
Success. So I put the original mechanism back in the player, and hey presto, it's working. CDRs as well. Noisier than the alternative mechanisms during loading and seeking though (I think the sled mechanism is the cause), but almost silent during playback, even with the lid off.
How the platter got compacted onto the spindle during delivery to me is a complete mystery. Perhaps the seller hadn't told me everything. But I got a partial refund which I'm happy with.
So why the minor incompatibilities? I think it could be in the clamping arrangements, which certainly differ between the Marantz CD63 and the Philips CD713, though it all seemed to fit together mechanically. Or slightly different control signals during error correction? I don't know, really. The original mechanism is CDM12.1/15, the one from the Philips player is VAM1201/11 and the eBay special is VAM1202.