Arcade Collecting > Pinball
Black Knight pin blowing fuses
lilshawn:
sometimes you just gotta go with what you can find... on the first version main power board, the original style SDS201/SDS202 transistors at Q1/Q3 are no longer available in any flavor or form from anybody anywhere. These two transistors must be replaced with the newer MJE15030/MJE15031 transistors. BUT the MJE transistors had a different pinout than the original SDS transistors, so they must be installed differently on the board!! this was changed on later boards to fit the standard BCE pinout
SDS trans: E B C
MJE trans: B C E
B=base
C=collector
E=emitter
the fix looks stupid, but you gotta do what you gotta do...
ALSO
If any of these coils has a bad diode, this can almost instantly kill its associated driver transistor! The coil diode prevents a coil's collapsing voltage from "backwashing" to the driver board, damaging the driver transistor.
Since you spent the time to test/replace the bad driver board transistors, (you did didn't you??) it only makes sense to also check for bad coil diodes. Since these 1N4004 diodes are mounted right to the coils under the playfield, vibration can crack or damage them.
SirPeale:
--- Quote from: lilshawn on March 03, 2010, 10:31:54 pm ---
Since you spent the time to test/replace the bad driver board transistors, (you did didn't you??) it only makes sense to also check for bad coil diodes. Since these 1N4004 diodes are mounted right to the coils under the playfield, vibration can crack or damage them.
--- End quote ---
I tested them on location, but was in a hurry to get out of there that day so have lost track of which ones are bad. Shouldn't be hard to track down.
The coil diodes are fine, and yes, I know enough to test them. :)
SirPeale:
Gah...help me out here. I'm trying to ID the drivers on the driver board.
8977 is easy...crosses to an NTE266, which also crosses to a TIP120.
What about a 9410?
SirPeale:
According to the schematic, they're ALL TIP120 transistors.
lilshawn:
:dizzy:
yeah, them guys can never make up their minds....
The most commonly used transistor on the driver board is the TIP120 (along with its 2N4401 pre-driver transistor). It is responsible for driving all the solenoids. Also used is the TIP42, for the Lamp matrix column drives. The 2N6122 (TIP41) transistor is used for the Lamp matrix row drives, and the small 2N6427 transistor is used for overcurrent protection in the lamp matrix. There are some 2N5060 Silicon Controlled Rectifiers (SCRs) used too.
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