It is currently 28 Mar 2024, 09:52




 Page 1 of 1 [ 7 posts ] 
Author Message
 Post subject: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 09 Oct 2020, 09:43 
Shows curiousity
Shows curiousity
User avatar

Joined: 05 Aug 2020, 08:12
Posts: 25
Location: United Kingdom
Has thanked: 10 times
Been thanked: 8 times
Good morning all. I am looking for a power transformer (VTT1062) for a Pioneer CLD-1750/CLD-1600/CLD-600.

Or, the complete power supply circuit board - VWR-1093

Or, if there is a CLD-1750/1600/600 out there with a good power supply I would be interested.

Thanks in advance,
Martin.
_________________
=============================
Pioneer CLD-1750
Pioneer CLD-2950
Pioneer CLD-D925
Offline
 Profile  
 
 Post subject: Re: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 09 Oct 2020, 20:01 
Hardcore fan
Hardcore fan
User avatar

Joined: 13 Aug 2018, 03:18
Posts: 1512
Has thanked: 443 times
Been thanked: 584 times
I had a dead transformer due to the thermal fuse being blown inside of it. I jumped it and it came back to life. Have you tried checking this?
Offline
 Profile  
 
 Post subject: Re: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 09 Oct 2020, 21:38 
Shows curiousity
Shows curiousity
User avatar

Joined: 05 Aug 2020, 08:12
Posts: 25
Location: United Kingdom
Has thanked: 10 times
Been thanked: 8 times
cplusplus wrote:
I had a dead transformer due to the thermal fuse being blown inside of it. I jumped it and it came back to life. Have you tried checking this?



Hi there C++ :-) the transformer is "kind of working".

The Spindle motor and the main motherboard are powered off +14V and a -14V rails derived from 2 transformer windings in series. The problem is that the smaller winding has become high resistance and has dropped some of it's output voltage (also the AC waveform is mal formed) and therefore the bridge rectifier is only rectifying a little over half of the power required by the spindle motor and electronics.... So when the disc spins up the display dims dramatically and the player refuses to play a 30cm LD and ejects it.... 8" Music CD Video's and regular audio CD's play fine because they are drawing much less power by the spindle motor..

Sorry for the wordy explanation... Basically Transformer is working but on it's way out... (Schematic is attached).

Need a NOS power TX to fix really.... I may have to build a MOD for a close compatible power TX (worse case scenario).

Martin.


Attachments:
CLD1600 PSU.PNG
CLD1600 PSU.PNG [ 224.85 KiB | Viewed 1300 times ]
_________________
=============================
Pioneer CLD-1750
Pioneer CLD-2950
Pioneer CLD-D925
Offline
 Profile  
 
 Post subject: Re: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 09 Oct 2020, 22:33 
Hardcore fan
Hardcore fan
User avatar

Joined: 13 Aug 2018, 03:18
Posts: 1512
Has thanked: 443 times
Been thanked: 584 times
strikemrb1 wrote:
Sorry for the wordy explanation...

Wordier the better when it comes to repair. Before I realized the thermal fuse was blown in my unit, I had actually reached out to a few places for quotes on rebuilding the transformer because I didn't think I would be able to find a parts CLD-91/92 unit for much cheaper. With the CLD-1750, you might have an easier time getting a donor unit, although I'm not sure what the situation is like in the UK. I have a few expensive players sitting in purgatory waiting for parts, so sometimes it is just a waiting game but worth it in the end.
Offline
 Profile  
 
 Post subject: Re: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 11 Oct 2020, 10:37 
Shows curiousity
Shows curiousity
User avatar

Joined: 05 Aug 2020, 08:12
Posts: 25
Location: United Kingdom
Has thanked: 10 times
Been thanked: 8 times
cplusplus wrote:
strikemrb1 wrote:
Sorry for the wordy explanation...

Wordier the better when it comes to repair. Before I realized the thermal fuse was blown in my unit, I had actually reached out to a few places for quotes on rebuilding the transformer because I didn't think I would be able to find a parts CLD-91/92 unit for much cheaper. With the CLD-1750, you might have an easier time getting a donor unit, although I'm not sure what the situation is like in the UK. I have a few expensive players sitting in purgatory waiting for parts, so sometimes it is just a waiting game but worth it in the end.


I did some on line research about having Power TXs rebuilt so I have a few emails out there asking for quotes etc.... Let's see..
_________________
=============================
Pioneer CLD-1750
Pioneer CLD-2950
Pioneer CLD-D925
Offline
 Profile  
 
 Post subject: Re: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 11 Oct 2020, 16:59 
Hardcore fan
Hardcore fan
User avatar

Joined: 13 Aug 2018, 03:18
Posts: 1512
Has thanked: 443 times
Been thanked: 584 times
Yeah I found a few shops that specialized in rebuilding transformers for guitar amplifiers. This might be crazy expensive, but at least getting a quote is free. I was going to try to rebuild mine myself, but I lacked the tools. It was a huge laminated core transformer that was welded together.
Offline
 Profile  
 
 Post subject: Re: Pioneer CLD-1750 Power Transformer (VTT-1062)
PostPosted: 19 Oct 2020, 13:38 
Shows curiousity
Shows curiousity
User avatar

Joined: 05 Aug 2020, 08:12
Posts: 25
Location: United Kingdom
Has thanked: 10 times
Been thanked: 8 times
I actually found out the issue. The player is only getting half of the power it should because one of the transformer joints is cracked! As a result the bridge rectifier is only rectifying half of the AC!. No transformer needed! Discs spin up without dimming the entire display and discs are not rejected because of speed spin up issues. :clap:

Pictures anyone?
_________________
=============================
Pioneer CLD-1750
Pioneer CLD-2950
Pioneer CLD-D925
Offline
 Profile  
 
Display posts from previous:  Sort by  
 Page 1 of 1 [ 7 posts ] 


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

cron