2nd Generation CD player - Philips CD104
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- čas přidán 9. 07. 2024
- Looking into why this early second generation CD player has superior tracking to more modern units. Although built in 1984 I have kept this compact disk player as it out performs many more modern units, seamlessly coping with marked and damaged disks.
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Memories, my Dad had a CD104 in the same colour that we had for over a decade. Pretty sure it still worked when it got thrown away, never forgot how solid the tray was and the square control plate.
They were well made.
Great video mate 👍👍😁 I like looking at the earlier stuff
Interesting look. It's harking back to s time when it was a multi chip affair, cd/dvd writer players and the ilk are so streamlined now the bom cost must have been slashed! I miss the days of service manuals, service manuals for younger kit is becoming rarer and rarer outside of professional equipment.
I have four CD104 CD Players. Mostly heavyweight metal construction. I believe they date from 1984 (so 40 years old). The swing arm pickup is superb. It could get a tune out of a beer mat! Pity Philips stopped production, and moved on to linear pickups, which are inferior to swing arm.
The DAC's are 14 bit mono (x2).
Totally, tracking on these is superb. It will pay disk that haven't a chance of working in newer machines
Sadly much missed cast chassis' on lots of machines.
What's interesting this specific unit has cdm-0 transport with board that looks identical to cdm-1. I have cd-104 unit with cdm-0 as well but trasport board has completely different design!
I can't account for that, other than the unit developed a fault early on and under warranty. I never figured out the repair other than it was back at Philips for a while. I found an off-cut of wire rattling about inside when it returned. That may account for a board swap. Thanks for the observation.
It's not so much due to the sled system it uses, I had a CD with 2 and 3 dark lines and they all played well in most old CD players, as long as their servo systems were calibrated.
What I've noticed though, is that the diameter of the lens on players that have problems reading those discs, is smaller than on old players.
And since a CD player can read a disc as long as some light can pass "around" the scratches (and in this case that black line), a smaller lens will produce an unfocused beam of smaller diameter and thus be blocked by that black line.
That's what I remember from the theory though, but it seems to make sense.
Interesting, I had presumed the larger mass of the sled couldn’t react fast enough to lose the tracking for the missing section covered with tape. Where as the fast-acting lens adjustment on the stepper assembly would have moved and have to hunt for the track.
Hi, can you shw the belt/gear assembly for operating the tray as I have to repair mine and wonder if this is any different from the later generations? Cheers David
Although simple , it's tricky to see without stripping down the unit. There is a small belt drive from the motor to a nylon gear which drive the toothed rack on the tray. That's it just 3 parts plus the small belt.
did the older models not have error correction built in hence they could only hold 74 mins, newer models and discs held 80 mins minus the error correction
Think they all use error correction and I'm not sure if it was changed over the years. Discs often had extra space on them, some artists would put pictures encoded onto the discs in early years. Never had any disc that couldn't play fully on this older unit for tracking reasons. I did run into trouble playing writeable disks latterly. They would play fine for a while then I would get read errors on starts. I suspected the laser intensity was the cause rather than any error handling.