Need Diagnosis Help: Shanling Tube CD-S100se

[Mayank]

This is my first tube/digital hybrid DIY project, so please go easy on me

I had bought a non-working Shanling CD-S100se unit after reading several reviews about its superior build quality and various upgrade potential. It does looks really well made and in good condition, with all components neatly marked on a multilayer PCB. It has "audio grade" capacitors and Burr Brown op amps in removable sockets.

The unit exhibits the following:

o Powers on
o The display keeps showing "Loading"
o CD platter motor does not spin
o The CD head doesn't move up/down
o I do not find the laser being turned on
o None of the buttons on the front panel work (FF/Rew/Stop/Play or Eject)
o The tube filament lights up

On removing the CD mechanism, I found a part number SF-HD850 on the laser head. So I presume this is a Sanyo SF-HD850 laser unit.

I haven't been able to find a service manual or the schematic anywhere on the web.

Before I order a replacement laser (I found 2 sellers on eBay) is there a way to confirm that it is indeed the laser which is at fault? Remember, on powering up, neither does the disk motor not spin/move the head, nor does the motor work for ejecting the disk.

I am, of course, in the meanwhile doing the obvious:

a. checking all the voltages of the 5 independent power supplies
b. removing and re-inserting all the connectors and verifying connectivity
c. cleaning the lens
d. checking all the motors
e. carefully looking for any signs of dry solder

Looking forward to comments and recommendations,

Rgds
Mayank

[Sendy]

Is it system with TDA1300 and SAA7327 ?

[Badge]

Sounds like a problem on the logic circuit that controls functions? See if you can trip a sensor or switch on the disc mechanism to start play, eject, etc. I am guessing there is a board with large I.C.'s behind the display/function keys and the problem might be there?

[Sendy]

Standard test procedure :
- disc loader mechanism (eject, insert and lock disc and others in right position and end signal)
- laser lightning and beginning position of pickup support
- ficusing (up-down lens and focus on disc)
- disc rotation
- etc. etc.

This procedure is the same for 98% players.

More information on faqrepair pages.

Sci.Electronics.Repair FAQ: Notes on the Troubleshooting and Repair of Compact Disc Players and CDROM Drives