(Topic ID: 327338)

Gtb Flipper clown score motor problem(s).

By durriti

1 year ago

Topic Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by durriti
  • Topic is favorited by 1 Pinsider


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#1 1 year ago

Hello All,

After months of off/on working on the machine l powered it up and several problems are present. (A small piece of back ground information, the machine has had various wiring mods to hack problems but not fix the problems). The first problem is the score motor running on, looking at the 1 position switch stack, l checked all the contacts and screws, contacts cleaned, gapped ok and screws holding switches tight. What l did notice is that when l press lightly with my finger at the bottom 1A switches that the score reels reset, clown animation fires, left/right hand target resets, reset bank fire, ball release coil attempts to work, add balls unit fires and score motor then stops. This set of switches run on the lower motor cam , (3 x 5 spikes). This group of switches are actuated via a small arm that hooks into a flat 'fork' that sits at the bottom of the switch stack, the fork has two slots, 'S' and 'L' positions, the small arm is in the correct 's' position.
Any thoughts why or what happening.

Thanks in advance.

#2 1 year ago


l removed all the switches from the number one position on the score motor, they have to be released together as 'A', 'B' and 'C' switch stacks are loop together by wires. Looking at the switches l could not see anything wrong but looking at the 'forks' that hold the 'fingers' operate the 'A' and 'C' l noticed that one is bent, see picture. In the picture you can see the two forks pinced together and the upper of the two is bent. The bent fork is from the lower 'A' switches where l was pressing with my finger, the third fork/finger set is a spare. Whether this is the problem l will find out later but l though it might be helpfull to other pinsiders.

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#3 1 year ago

Bingo!, of sorts.

Fitting the straight fork and finger has produce a result. With game at rest l manually add score to the score reels, advance targets and then press the game button on the front door, the score motor turns, score reels zero, clown bangs the gong, add ball unit functions (anywhere between 5 to 7 balls added), left and right targets reset, ball releases. But there is no operation in regard to the following, flippers, slingshots, pop bumpers, roto target, any one point switches or roll over switches, anything on the playfield. There are playfield lights.
Any ideas?, this was the situation before the score motor problem.

Thanks in advance.

#4 1 year ago

Reply sent in private message

#5 1 year ago

l was thinking about the fact that nothing on the playfield worked and that the black wire that seems to have continuity from the jones plug to the last coil, (ball release), perhaps it was something coming back the other way. The black wire is straight from the transformer and goes to every coil/relay, after coils/relays there is a swtch either open or closed. Looking at the schematic l noticed a switch, (zero position balls to play unit), my thinking is about something either cutting the power or not completing the circuit. l had a look at the unit and found a broken switch, (see picture), this switch is on the reverse side of the unit so not seen without dropping unit. l don't think this is the cause of the problem but it will be replaced to see if anything different happens.

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#6 1 year ago


l replaced the broken switches in the balls to play unit but as l thought the 'no power to the flippers , bumpers etc' continued when the game was started. In the past l had a problem with a machine where l had 'momentry power' to a kicker, this meant the coil 'flinched ' opossed to fully activating. With this is mind l taped a set of flipper contacts together and pressed the game button on the door. Bingo, the flipper coil actived and then lost power as the machine went through it start up cycle. With the machine 5 balls to play, nothing working on the playfield, l found that if l pressed the 'spin' relay, score motor turned and the roto coil 'flinched', most of the functions work via their respective relays, bumpers, score reels. This leads me to think that the loss of power is possibly switch related.

Any thoughts?.


#7 1 year ago

Assuming it has one, is the reset bank bank working correctly , wing nuts tight and the unit sitting in its cradle correctly? I've had a similar issue before where the game over relay wasnt getting reset on start up so the machine wasnt going into game mode.

#8 1 year ago

Yes the reset bank craddle is sitting correctly and wing nuts are tight, but thanks for the imput. After reading some items on pinwiki, l'm investigating the score motor, and the reset relay. Luckerly the start up sequence for flipper clown is on pinwiki is a great help. Thanks again for the imput.

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