Question about Pioneer DV-737 DVD Player

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Replacement part Would like to purchase circuit board that contains the motor drive IC for the DV-737 Pioneer Player. Numbers on board are : VNP 1779-B, Label VQE Vide Quality Enhancer. Dimension 9.25" x 4.5". Thanks. P. Perry

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@Pepdiauq did you manage to locate a new board? I think we've got the same problem! Eject wont work although motor is fine. tracked it down to a M56788FP chip (possibly).

Posted on Feb 28, 2010

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Posted on Jan 02, 2017

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Pioneer DV-C36 disc tray will not stay open


Solution for Pioneer DV-C36 Multi Disk DVD player - tray door will not stay open.

My player would open the disk tray when the open button was press but when the tray was fully open it would retract
back into the unit leaving no time to change or load disks.
I found a poor connection at the ribbon cable connector was causing this problem. A seven conductor ribbon cable
connects the main unit with the travelling tray. A position switch (S21) senses when the tray is fully extended and retracted.
On my player pin 1 of the ribbon cable connector on the travelling tray was not making an electrical connection which
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I was able to desolder the connector and pull the contact out just far enough to reform the tang with fine needle nose pliers.
This is very tedious and required an eye loupe for magnification.
Tools required:
#1 and #2 phillips screwdrivers
Soldering and desoldering irons (or other desoldering tools)
Fine needle nose pliers.

Remove the tray ribbon cable
1. Remove the cabinet cover - 6 screws. Open the tray. To keep the tray from retracting pull the power cord when the tray is extended.
2. Remove the front bezel from the tray. Gently pry up the bezel by relesing the catches with a small screwdriver. Allow the tray to retract.
3. Remove the front panel - undo large ribbon and wire connections on right, remove screws left and right, release
two catch tangs on bottom edge using a small screwdriver on the inside of the unit.
4. Remove the white plastic cover over the laser mechanism ( 2 screws) Remove the disk carrier by removing the center screw.
5. Extend the tray again. When the tray is out the small ribbon cable is visible below the tray. Undo the ribon cable where it attaches to the main unit unit.
6. To slide the tray off the main unit use a small screwdriver to depress the stop catches (2) in the tray. They are molded into the tray.
Pull the tray out further then lift up.
7. Flip over the tray and find the small circuit board the ribbon cable goes to. Desolder the motor wires (red and black) and remove the 2 screws
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Use a multimeter to confirm there is an open or poor connection in the ribbon cable connector.

Remove the ribon cable and inspect the connector with an eye loupe or other magnification device. On my player contact #1 was not positioned properly
to press against the ribbon cable conductor. You can either replace the connector or repair it.
Warning: repairing the connector may damage it.
To repair the contact desolder the connector from the circuit board. Bend the circuit board prong straight and push it into the body of the
connector which will extend the contact out and the contact can be reformed. Be very gentle. Bending the contact may cause it to break.

Reassembly is the reverse. Don't forget to solder the motor wires with the proper polarity. Red and Black are labeled on the circuit board.

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