Attack from Mars
Bally, 1995There have been 2 images uploaded to this topic. (View topic image gallery).
Hi There
Can someone can help me plz? My AFM the bank target is not moving up or down. It looks like there is no power 12v to the motor. Can anyone suggest to me where should I start? And check what the issue maybe?
I checked the fuse and the coin door was closed when I in the testing mode.
Best regards
Paul
You don't need to close the door or enable the high power interlock switch for 12 volts.
The motor plugs onto a small board nearby. Power to the board ? Power to the motor ?
Try and isolate bad motor, bad board, or power not getting there.
LTG : )
Hi LTG
Thank you for the reply. There is no 12v to the small board next to the motor. So I believe is it a transistor issue on the board. Plus I believe the transistor at Q29 is control the motor. Plz let me know if I am wrong.
I put the board out and test the transistor from Q29 to Q32.
Test # 1
Black pin in the middle leg. Red at the other two legs. All of them showed OL.
Test # 2
With red pin in the middle with black pin on the left pin
Q29- .574
Q30- .533
Q31- .574
Q32- .579
Test # 3
With red pin in the middle with black pin on the right pin
Q29- .482
Q30- .483
Q31- .481
Q32- .479
My conclusion is I have no clue how to tell which transistor is bad 
any suggestions?
Best regards
Paul
I just fixed this for a buddy. There was 12v in, but not out. I reflowed the pins and that solved it. Is there 12v coming out of the driver board? Trace the power and see where you lose it.
Thank you for all the replies.
I think I found something unusual.
The transistor on this mini board under the playfield or next the motor (pic 1 & pic 2). Have some unusual testing results.
Test # 1
Black pin in the middle leg. Red pin on the left.
Reading- .754
Test # 2
Black pin in the middle leg. Red pin on the right.
Reading- .696
I believe it should be show OL right? If the transistor was good and based on my previous post testing results.
Test # 3
With red pin in the middle with black pin on the left
Reading - .554
Test # 4
With red pin in the middle with black pin on the right
Reading- .482
My questions are:
1. Is it that TIP102 faulty?
2. If yes, can I just replace another TIP102?
Just want to confirm the Transistor on the board has labeled “9540 Malaysia TIP 102” on it. My new one has “CDIL TIP102 W7 T” on it. I believe this should be OK right?
Thank you in advance
Best regards
Paul
4110939E-CDE4-4CB6-8252-7845832266CE (resized).jpeg
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Quoted from Pinrookie:
Just want to confirm the Transistor on the board has labeled “9540 Malaysia TIP 102” on it. My new one has “CDIL TIP102 W7 T” on it. I believe this should be OK right?
Yes, the extra info is just the manufacturing information.
Quoted from ForceFlow:
Yes, the extra info is just the manufacturing information.
Thank you
I believe the transistor on the board is faulty right?
I try to solve this issue one at a time 
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