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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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17th Apr 2017, 3:36 pm | #1 |
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Philips CD100 / Marantz CD63 capacitor access
I have started to investigate what is wrong with my CD63, and as in this thread the volts around the LM337 are very low. The 100uF electrolytic 2291 is looking distinctly bulged so it is a prime candidate for replacement.
However, access is very difficult because the aluminium chassis is in the way. It's not possible to remove the PCB from the chassis without unscrewing all the voltage regulators from the heatsink, which is part of the chassis. I think I can manage to change the cap as things are but it will be a very fiddly job. Should I just press on, or have I missed something obvious when dismantling? |
17th Apr 2017, 4:20 pm | #2 |
Heptode
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Re: Philips CD100 / Marantz CD63 capacitor access
Hi Paul - not sure it'll help much - but I assume you have the service manual ?
If not, it's on Elektrotanya (Philips CD100), and shows a bit about dismantling / accessing the various areas - albeit in German... not sure if it covers what you need, but maybe worth a look. |
17th Apr 2017, 10:55 pm | #3 |
Octode
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Re: Philips CD100 / Marantz CD63 capacitor access
I think that the finned heat-sink disconnects from a thick alumininm plate to which the regulators are bolted. The black heat sink is fixed to the plate with a couple of screws at the rear of the case. There is no need to unbolt the individual regulators, although they may need re-soldering due to cracked joints.
My recollection of dismantling the CD100 is poor, but I have a photo of one I fixed a long time ago for Howard, showing the servo board having been removed from the chassis, which may help with the dismantling. The mains transformer connections unplug, I think, then the pcb can be removed after taking out a number of fixing screws around its periphery. Ron Last edited by ronbryan; 17th Apr 2017 at 11:00 pm. |
17th Apr 2017, 11:20 pm | #4 |
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Re: Philips CD100 / Marantz CD63 capacitor access
Thanks for that Ron, I remembered that you'd worked on these so hoped you'd comment. The photo is a big help. Are the red electrolytics the ones that you changed?
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18th Apr 2017, 9:26 am | #5 |
Dekatron
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Re: Philips CD100 / Marantz CD63 capacitor access
The red caps were the 'upgrade' to the power supply Marantz to set it apart from the bog standard Philips. Of course they will still go faulty at some stage.
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18th Apr 2017, 11:13 am | #6 |
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Re: Philips CD100 / Marantz CD63 capacitor access
No, the photo is a CD100. My CD63 has bog standard blue Philips caps throughout, which is why I thought Ron may have changed them. I was wondering what his reasoning was, and whether they had tested bad or just been changed as preventative maintenance.
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18th Apr 2017, 11:32 am | #7 |
Octode
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Re: Philips CD100 / Marantz CD63 capacitor access
I would first change C2290 and C2291, both 100uF, which are used to derive the -18V supply in a voltage doubler circuit. They seem to have a hard life in that circuit.
I can't remember their position on the circuit board, but the layout diagram will show them if your pcb is not silk screened with component identification. Ron |
18th Apr 2017, 12:20 pm | #8 |
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Re: Philips CD100 / Marantz CD63 capacitor access
C2291 is below the big blue cap on the top right of your photo. Presumably 2290 is adjacent, but it's hidden by the chassis until I get the PCB out.
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18th Apr 2017, 2:43 pm | #9 |
Octode
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Re: Philips CD100 / Marantz CD63 capacitor access
Paul
I've attched a couple of photos of the CD100/CD63 dismantling instructions - this is the best I can do at present concerning the image quality. Ron |
18th Apr 2017, 2:47 pm | #10 |
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Re: Philips CD100 / Marantz CD63 capacitor access
Thanks Ron. It's just separating the regulator heatsink from the chassis that I didn't understand. I think I have enough info to proceed now.
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22nd Apr 2017, 3:03 pm | #11 |
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Re: Philips CD100 / Marantz CD63 capacitor access
The good news is that I successfully removed the PCB and changed the caps. C2291 had indeed dropped to 48uF. The bad news is that this hasn't cleared the fault. I now think there is a mechanical problem with the mech, as there is a faint mechanical noise as the CD tries to spin up, a bit like a slipping idler wheel, though the turntable feels free to move. I hope the spindle motor isn't knackered.
I will delve into the CDM0 innards and see what I can find, and start another thread if appropriate. Thanks to all who provided info in this thread. |
22nd Apr 2017, 4:46 pm | #12 |
Dekatron
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Re: Philips CD100 / Marantz CD63 capacitor access
Paul said "there is a faint mechanical noise as the CD tries to spin up, a bit like a slipping idler wheel, though the turntable feels free to move. I hope the spindle motor isn't knackered."
Could be a slippage between the TT and the disc due to a loose disc clamp. Might also be the motor but that is usually cured by a drop of lubricant. |
22nd Apr 2017, 4:53 pm | #13 |
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Re: Philips CD100 / Marantz CD63 capacitor access
No, it's not that. It has now started working normally after being powered up for an hour - great, not only an obscure fault but intermittent as well Googling finds a few people with similar symptoms but no real solutions, just vague references to the spindle motor and bearing. Apparently there are one or more electrolytics on the servo board so I suppose that's the first thing to check.
I'll leave it powered off overnight and see if the fault returns tomorrow. |
23rd Apr 2017, 10:56 am | #14 |
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Re: Philips CD100 / Marantz CD63 capacitor access
The fault is still absent after 12 hours without power, so maybe a marginal cap has reformed somewhere. I'll return the player to use (it's part of the office system) and see what happens.
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23rd Apr 2017, 3:31 pm | #15 |
Octode
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Re: Philips CD100 / Marantz CD63 capacitor access
Did you have time to check for cracked joints on the 3 terminal regulators?
Leon always maintains that they fatigue because there is no allowance for thermal expansion in the connection between the pcb and the chassis, due to the rigid fixing to the finned heat-sink. Ron |
23rd Apr 2017, 4:34 pm | #16 |
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Re: Philips CD100 / Marantz CD63 capacitor access
I did look and couldn't see anything wrong with them, but I didn't actually remake the joints. I will do so next time I have the covers off.
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