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Philips (Marantz) CD-60 not spinning up
Philips (Marantz) CD-60 not spinning up
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Old 10th June 2018, 11:14 AM   #1
hollowman is offline hollowman  United States
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Default Philips (Marantz) CD-60 not spinning up

My Philips CD-60 (same model as Marantz CD-60) was subjected to a moderate shock (fell onto its side onto a carpeted floor) about 1 foot (0.3 meters).

Powering up, fluorescent display seems fine, and the motor tray (drawer) works fine. But when a CD tries to boot, it slightly spins forward, then backward a little, but never spins up ... it just gives up, so no reading of Table Of Contents.

A brief measurement of voltages seems to indicate all voltages are okay. I did very briefly inspect the PCB for broken joints -- none visible.

I think the laser is okay. I put my smartphones' camera right on top the laser (so I could safely watch the laser turn on). And, yes, upon hitting Play, the laser illuminates (red) and does its focus routine.

Not really sure where to go next .... any help appreciated!!
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Old 10th June 2018, 02:20 PM   #2
percival007 is online now percival007  England
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The delicate Prism and Laser Diodes may have been knocked out of alignment.
Could be game over for that Laser. CDM-4 ?

P.
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Old 10th June 2018, 03:14 PM   #3
hollowman is offline hollowman  United States
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Default Highly unlikely

Quote:
Originally Posted by percival007 View Post
The delicate Prism and Laser Diodes may have been knocked out of alignment.
Highly unlikely. Think about all the inertia and "shock" they go thru during normal play.
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Old 10th June 2018, 05:42 PM   #4
hollowman is offline hollowman  United States
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Default An experiment ...

Okay, here's some other weird stuff ... on the assumption that it was the Philips CD60's CDM4/19 that may have been damaged, I swapped it with another (good) CDM4/19 from a Philips CDB610 .
Both the Philips CDPs are very similar, down to PCB, and were manuf'd in late 1989.

When I swapped the CDM4/19s, both players exhibited exactly the same problem I outlined in the original post.

Next, I put the CDM4/19s back in original players (i.e., before swap). The Philps CD60 still has the same problem as reported in original post. But the CDB610 plays fine.

The only thing I can speculate is that the CD60, after the accident, developed multiple transport issues. Or maybe the laser power needs to be adjusted?
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Last edited by hollowman; 10th June 2018 at 05:44 PM.
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Old 10th June 2018, 06:04 PM   #5
percival007 is online now percival007  England
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Quote:
Originally Posted by hollowman View Post
Highly unlikely. Think about all the inertia and "shock" they go thru during normal play.
Hardly any shock during normal play.
Granted, they go through more shocks being thrown around by couriers/port/airport staff on their way from the Manufacturer to the end user.

Could it be the alignment pot/s have been knocked out of alignment? Worth a tweak.

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Old 10th June 2018, 06:18 PM   #6
hollowman is offline hollowman  United States
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Default alignment pot/s

Quote:
Originally Posted by percival007 View Post
Hardly any shock during normal play.
Granted, they go through more shocks being thrown around by couriers/port/airport staff on their way from the Manufacturer to the end user.
I have several Philips/Magnavox CDPs of this vintage ... all bought used from eBay ... all shipped to me w/o transport screws ... all packaged from mediocre to poor.
Never received a damaged/defective unit.
Quote:
Could it be the alignment pot/s have been knocked out of alignment? Worth a tweak.
P.
I've read about alignment pots -- and see some trimmers on the PCB -- but have never attempted it.
I think I see two trimmers on the PCB, just below the CDM4. I have no idea how to adjust these. In the Serv. Man., there seems to be some procedure using an o'scope?

EDIT:

I see two trim pots: Focus Offset [22k] and Laser Out. Adj. [4K7]
Which to attempt first? Is there a formal procedure?
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Last edited by hollowman; 10th June 2018 at 06:42 PM.
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Old 11th June 2018, 02:21 AM   #7
ekidnah09 is offline ekidnah09  Australia
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Could it be something as simple as a socket coming loose?
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Old 11th June 2018, 06:14 AM   #8
hollowman is offline hollowman  United States
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Default Running out of options ...

Quote:
Originally Posted by ekidnah09 View Post
Could it be something as simple as a socket coming loose?
Socket to what ? ... flexprint -- I doubt it. Spin motor ... nope.
Again:
The disc does start to spin slowly -- a few turns -- reverses rotation slightly, then stops. Most working Philips players will go thru this same routine with no disk (e.g. power up, or closing the drawer, or hitting Play with no disk).

I did the no-clock test: removed the osc. (clock) from the circuit. And the disk-spin motor spins at crazy-fast speed (charc. of no clock signal).

I did mark and slightly adjust both Laser Power and Focus Adj. But no luck.

I also re-flowed (solder) several transport-related circuits. But, no go!
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Last edited by hollowman; 11th June 2018 at 06:32 AM.
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Old 11th June 2018, 09:26 AM   #9
Mooly is offline Mooly  United Kingdom
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Philips (Marantz) CD-60 not spinning up
Is the mains transformer soldered to a PCB ? If so then check for cracks in the print around the transformer. Same applies to regulators and transistors mounted on a heatsink and with the leads going into a PCB.
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Old 11th June 2018, 02:36 PM   #10
hollowman is offline hollowman  United States
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Default Symptoms for troubleshooting ...

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Originally Posted by Mooly View Post
Is the mains transformer soldered to a PCB ? If so then check for cracks in the print around the transformer. Same applies to regulators and transistors mounted on a heatsink and with the leads going into a PCB.
All "look" good AFAICS.

Some other symptoms just after the accident:

I powered the CD60 only after removing the cover to make sure all "looked" okay.
Powering up, display was normal and (I think) a CD was spinning/playing fine, BUT:

- there was a loud buzz at output jacks (both channels)
- there was a mild acrid odor (like something overheating)
- TDA1541A very warm to touch (after player being on only a min. or two -- not normal. I powered off immediately. I didn't check the other ICs/components for similar heat. The smell could've been coming from anywhere. The Mains 300mA fuse never blew.

I removed the TDA1541A (a damn $$ double crown!) and checked it in another CDP -- sounded good, no heat issue.
I removed the output opamps from the CD60 (they were fine).

Then, I re-powered the CD60 sans TDA1541A and output opamps. No smell, no fuse blowing. No shorts to ground AFAICS. And all voltages tested fine.
I didn't put in a CD yet.
I re-inserted another TDA1541A, and output opamps into the CD60. No heat issue, output was quiet (no buzz).

Now, I put in a CD and ran into the topical issue!
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