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PIONEER CDJ MK 800

JPOPNPLUMB

Mar 7, 2023
4
Joined
Mar 7, 2023
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SO IVE BEEN TRACING POWER TO THE PCB FROM PS BOARD THE UNIT HAS NO DISPLAY , ALTHOUGH THR LCD IS LIT UP IN THE RIGHT HAND CORNER? IM ASSUMING THIS IS EITHER A BAD FLAT CABLE OR CONNECTION? OR POSSIBLY NOT ENOUGH V GETTING TO THE FLAT CABLE FROM POWER SUPPLY SIDE ? I JUST GOT THE SCHEMATICS TO GO THROUGH EACH SERIES OF I C LINKS FUN FUN ANY SUGGESTIONS IM OPEN TO ANY AT THIS POINT
 

Martaine2005

May 12, 2015
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Yeah, these have a bad name in the DJ industry. Fine for static work but not so for mobile.
They are very fragile and as so, I would definitely recommend checking the connections. I can’t remember if these have a zebra strip or not. If they do, it could be the problem.
As for the ‘caps lock’, sort it out!.

Martin
 

bertus

Moderator
Nov 8, 2019
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Hello,

As the others said, check your CAPS key. Writing a text in all caps is like shouting.
Also use some line breaks as a wall of text might overwelm people.
You could measure voltages before and after the flat cable and see if there is a difference.

Bertus
 

JPOPNPLUMB

Mar 7, 2023
4
Joined
Mar 7, 2023
Messages
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My bad for the caps lock. Not intentional, frustrated or anything of that nature. Probably just a bit lazy. Anyways , I appreciate the input.

I will look into those procedures. As far as the zebra strip? Are you referring to the 25 pin ? With the ribbon style cables? Like the old

Commodore computers ? My apologies on the ignorance just not quite there yet with the component lingo. I will post up the schematics <

block and wiring diagrams. Hopefully that will shed some light. I am currently troubleshooting pretty much the same issue with the

MK 800, except this unit is the MK 1000. My opinion, a much bigger headache with the overall schematics on this particular unit.

I will keep you all posted, and thanks again for the insight.

JC
 

JPOPNPLUMB

Mar 7, 2023
4
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Mar 7, 2023
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MK 800 schematic. As requested. Let me know if you need a particular view. Cheers
 

Attachments

  • Screenshot 2023-03-07 at 21-51-00 Pioneer CDJ-800MK2 Service Manual (Page 33 of 228) ManualsLib.png
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  • Screenshot 2023-03-07 at 21-50-18 Ac In Trns Secb And Regb Assys - Pioneer CDJ-800MK2 Service ...png
    Screenshot 2023-03-07 at 21-50-18 Ac In Trns Secb And Regb Assys - Pioneer CDJ-800MK2 Service ...png
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  • mk wiring main.png
    mk wiring main.png
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  • Screenshot 2023-03-07 at 21-48-33 Pioneer CDJ-800MK2 Service Manual (Page 23 of 228) ManualsLib.png
    Screenshot 2023-03-07 at 21-48-33 Pioneer CDJ-800MK2 Service Manual (Page 23 of 228) ManualsLib.png
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  • Screenshot 2023-03-07 at 21-47-53 Overall Wiring Diagram - Pioneer CDJ-800MK2 Service Manual P...png
    Screenshot 2023-03-07 at 21-47-53 Overall Wiring Diagram - Pioneer CDJ-800MK2 Service Manual P...png
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  • Screenshot 2023-03-07 at 21-46-53 Block Diagram And Schematic Diagram Block Diagram - Pioneer ...png
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kellys_eye

Jun 25, 2010
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Jun 25, 2010
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6,473
Although the LCD is lit up in the right hand corner?
If the LCD works 'partly' then it's quite likely due to the connections on the LCD itself - they go from the glass display to the circuit board via something called a ZEBRA STRIP which is a long strip of vertical conductors, each separated from the other by 'rubber' insulation.

This strip has to be compressed between the LCD glass and the circuit board to get a decent connection and physical stress can easily cause the two to be moved from a 'parallel' position to a 'slant' and the conductive strip therefore only attaches at one end hence only part of the LCD works.

Happens a lot with 'mobile' equipment, handheld devices etc. Easily fixed by CAREFULLY removing the LCD retaining clips (or whatever), cleaning the strip and circuit board contacts - do NOT attempt to clean the LCD side - and refitting. You can often 'prove' the issue by applying careful pressure to the edge of the LCD and if more of it 'lights up' then the zebra strip is absolutely the cause.
 

JPOPNPLUMB

Mar 7, 2023
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Mar 7, 2023
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Your absolutely correct. I pressed down on the left corner of the board it self and the fluctuation had caused it to light up more. I’m going to take it apart again and carefully clean as suggested. Also carefully put back in place every other circuitry that had been dismantled. Well done. Thank you.
 
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