Cdm1 mkii

[QSerraTico_Tico]

Originally Posted by Steerpike

Those small silver-coloured axial caps go flakey too.

What are these silver-coloured caps? Electrolytics?

[Steerpike]

Originally Posted by QSerraTico_Tico

What are these silver-coloured caps? Electrolytics?

Not electrolytic. They are high precision 1% types, polyester or polystyrene I think. They are used in the servo feedback loops - where they make the player behave totally erratically, and in the de-emphasis network where they make an intermittent roaring sound.

[QSerraTico_Tico]

Thanks steerpike

[gto127]

Originally Posted by Steerpike

Not electrolytic. They are high precision 1% types, polyester or polystyrene I think. They are used in the servo feedback loops - where they make the player behave totally erratically, and in the de-emphasis network where they make an intermittent roaring sound.

I look in phillips cd 880 manual & the value of these caps is 3.6nf @ 160volts. They are 1% polystyrene caps. I looked for a source for these & can't find anywhere. Everyone lists in pf which would equate to 3600pf. The closest i see is 3900pf. Do you know a source for these? Would 2 % polypropolene work if 1% polystyrene can't be found? Thanks Domald

[UV101]

If its similar to the MKI version, there are 5 16v/33uF little blue radial elcos.

Mine was not reading disks, i replaced these 5 elco's with Sanyo Os-Con of the same value and the deck's as good as new now. This is a fairly well known problem given the age of the transport.

Also, I beleive (as stated in a previous post) that the laser can be taken from a cdm4. You will need the SM and a scope to set it up properly tho'. Also, the lense in the original mech is glass and the 4/19 used a plastic one.

I've don't think outright laser failiure is very common on these decks.

Pic showing the caps on my transport

[Steerpike]

Originally Posted by gto127

I looked for a source for these & can't find anywhere. Everyone lists in pf which would equate to 3600pf. The closest i see is 3900pf. Do you know a source for these? Would 2 % polypropolene work if 1% polystyrene can't be found?

I could never find them anywhere either! I used other standard value types of 2% or 5% tolerance in parallel or series combinations, that I measured first to find a very close match.
Eg., 3600pf you could make up from 3 x 1200pf in series, and 1200p is an easier value to find. And then if one of your 1200p is a bit on the high side, compensate by picking the others on the low side, so the total come to a good match.

[gto127]

Originally Posted by UV101

Also, the lense in the original mech is glass and the 4/19 used a plastic one.

I heard that philips didn't make any plastic lenses during the swing arm error(CDM1-9) but only after the introduction of the CDM12. Was I misinformed?

[UV101]

I'm no authority, only going on what I read some time ago albeit I can't remember where. I've googled again and it does seem that the lense is glass not plastic (on CDM4/19 in any case). I stand corrected!

[gto127]

Hello Steerpike,
Whats the best way to check polystyrene caps-can you use capacitance meter or do they usually break down with load? I have very little expeirence with polys & ceramics. Thanks Donald