Jurassic Park
Data East, 1993You're currently viewing posts by Pinsider chrishibler.
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Quoted from RampShot11:Thanks Terry. I have to check the 5v with the game on right ?
Yezzzzz.....
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info
Quoted from RampShot11:Ok so I found a bad capacitor C2 on the power supply , it was leaking onto the trace.
Very common.
http://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Missing_5VDC
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info
HV repair ... http://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#PS_520-5047-01_-_High_Voltage_Missing_at_the_DMD_display
Testing for HV (WMS games, but it's the same for DE) ... http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Testing_DMD_Controller_Power
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Chris Hibler
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info
And that will cause a blank display. Time to rebuild the HV circuit.
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info
Everything except the last two lines of this shopping list...but, measure the 500 ohm resistor just to be sure.
+68v circuit
Part Description Location Equivalent
MJE340† NPN transistor TR3 MJE15030
MPSA92 PNP transistor TR1 available
1n4760B 68v zener diode D9 available
1n5228 3.9v zener diode D6 available
1n4004 diode 400v @ 1A D5 available
47K resistor 1 Watt R8 available
330K resistor 0.5 (1/2) Watt R11 available
1.5K resistor 0.5 (1/2) Watt R12 available
500 ohm resistor 10 Watt Ceramic R15 available
100uF @200v Capacitor C10 e.g. 150uF @250v
Cut the old parts off. Don't try to solder suck the parts off. DE boards are pretty fragile.
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info
You should replace ALL of the parts, all at the same time. If you don't, a failed part will cause the good part you just installed to fail. I've gotten by in the past by replacing individual parts, but it's dicey.
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info
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