Data East HV rebuild

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Only small & medium sized DMDs are considered here!

When the DMD stopped working on my JP, some quick tests showed that the power board was no longer producing the -110V, -98V and 68V rails. The negatives were missing completely and 68V down to about 30. A quick visit to the best repair resource around gave me the components needed to rebuild this section of the PSU, and hopefully the information below reflects that. Unfortunately nobody seemed to be offering a kit of parts in the UK like you can get for WPC games. So, I am trying to fill that void in the hope of helping someone out who's in the same position I was.

You'll need to order all parts from the all boards section, plus parts from the section which matches your board version and revision.

Contents

Fuse

The HV display supply runs through F7 on the PSU board, which is a 0.5A Slow-blow type.

All boards (520-5047-xx)

Quantity Part Placement Farnell code
1 MPSA92 TR1 1574392
1 MPSA42 TR2 1574390
2 1N4004 D5,D7 9565027
2 1N4730 3.9V Zener D6,D8 1700872
1 1N4760 68V Zener D9 1621635
2 0.1uF, 500V ceramic disc C12, C13 N/A - try eBay


520-5047-00 additional

Quantity Part Placement Farnell code
1 MJE340 TR3 1574367
1 MJE350 TR4 1574368
1 1N5379 110V Zener D10 N/A - try 1N4764 (1621637)
1 1N4742 12V Zener D11 1612366
1 500R 10 watt resistor R15 N/A


520-5047-01 Rev A, Rev B additional

Quantity Part Placement Farnell code
2 MJE15030 TR3,TR6 9294180
1 MJE15031 TR4 9294490
1 1N4764 100V Zener D10 1621637
1 1N4743 13V Zener D11 1621619
1 130R 5 watt resistor R15 N/A


520-5047-01 Rev C, 520-5047-02 additional

Quantity Part Placement Farnell code
2 MJE15030 TR3,TR6 9294180
1 MJE15031 TR4 9294490
1 1N4764 100V Zener D11 1621637
1 1N4743 13V Zener D10 1621619
1 130R 5 watt resistor R15 N/A


Note: on pinrepair.com it states to pay special attention to D10 and D11 - make sure that you are replacing with the same as was there originally. This was not an issue in my case, but it seems to suggest there may be some differences.

The information provided is believed to be correct, but please check with manuals and other sources before ordering/replacing any parts as I can't accept any responsibility for inaccuracies. My board is a -02 model so I can't be certain about parts for the other versions and revisions. Please leave a comment if you have any input/suggestions/amendments.

If all else fails, you could go for the very reasonably priced DPS004 board from Rottendog Amusements!

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