CD 303 with Multiple Faults , Repair & Refurbisch

CD 303 , won’t play discs ,

 

 

interconnect board

Already added cinch chassis connectors

 

 

 

 

There has been done a lot of resoldering already

Won’t read discs, output Reed-relais switching  fast

Fixed the powersupply , Capicitors where really bad.

Quick Test there is audio  🙂

New capicitors

 

New Display , New Capicitor , New Switches

 

Resolder interconnects

Who has removed  the Conectors , and why..?

Track & selection leds resoldering

Player stopt working..:-( , Found some more trouble ,

 

 

 

 

 

 

 

 

Okay it’s starting up , reading TOC ,  plays CD’s, but it stops after 30 minutes and it won’t start again , why.???

Pin 8 drops to +2 volts ?

 

Pin 7

 

Replacing NE5514

Signal again…

After Adjusting Disc height , Focus Offset , and Focus-band-width , playing Big scratchs on CD without problems 😉

Tracking over 75 minutes Disc 🙂 , Radial and Focus servo working hard , Movie ->   Tracking Disc over 75 Minutes

What a tough guy this CD303 pffffff. Also a defective HEF4025 in the track detector, which does something with DO (Dropout) and HFL (high frequency present), What does that FS do (?) sorry , I don’t even see it anymore, blackout…

We can normally “REV” and “FWD” again without going crazy

 

“Hi Bram , FS stands for Fast Sum, all DC signals from the detector after the preamp added together.

The Track Loss Detector, (TLD) is used as a capture aid for the radial tracking.
Track Loss is detected when:

1. Less HF signal is present, from the HF Detector
2. More light comes from the plate, derived from the FS signal
3. and no Dropout signal occurs, also from the HF detector.
On some plates, they “forgot” to write a piece of pits on the track, the so-called “white dropout”.

The circuit takes the average FS signal, and stores it in C2204, using switch (transistor) 6204. Via resistor division 3215, 3217 it is checked whether “more light” comes back.”

Apparatus for enabling an autotrack circuit of an optical disc reading apparatus during the positioning of a read beam

 

 

“Thanks again for the repair! It’s been a tough one but now it plays great again!
I know there shouldn’t be any difference with the 100 but I feel like this one sounds even better”
“Nogmaals super bedankt voor de reparatie! Het is een zware dobber geweest maar nu speelt hij weer fantastisch!
Ik weet dat er eigenlijk geen verschil zou moeten zijn met de 100 maar voor mijn gevoel klinkt deze nog mooier”