T2 issues advice needed please!

[Graham Lowe]

Hi all, trying to help a mate with a couple of problems on his T2. He changed batteries recently and after that the trough left switch stopped registering a drained ball. Seems to check ok on a meter, changed diode but no better. I jumpered J206-1 to J208-5 according to the matrix diagram (didn't help that there are 2 versions in the manual!), but still registers as open on single switch test. Presume it should show closed switch when jumpered unless maybe there's a board issue? No obvious battery damage. Then discovered the skull drop target is dropping when a game is started; resetting manually does no good as it drops again when start button pressed. There is a relay next to the reset coil which fires 3 or 4 times when starting a game which I'm sure shouldn't be happeing either. I left him tracing wiring but haven't had any further word. Any suggestions gratefully received! Cheers

 

[pinballmania]

Always worth Reseatting the square asic chip. Press it home all the way round the edge with your thumb.

 

[Graham Lowe]

Thanks Andy, will get him to try that. Cheers

 

[Graham Lowe]

Always worth Reseatting the square asic chip. Press it home all the way round the edge with your thumb.

My mate tried that suggestion but sadly it didn't work.....next? Cheers

 

[chris b]

Check the switch on the drop target is working in switch test post a pic on here of the cpu a good one below the batteries

 

[Graham Lowe]

Thanks Chris, have forwarded your message to mate, will post when he gets back to me.

 

[Graham Lowe]

Incidentally Chris, the drop target switch was not actuating when we discovered the fault as the switch blade had got bent down through use, so I straightened it and the switch could then be heard operating, but guess it might still not have been registering. Cheers.

 

[Graham Lowe]

Check the switch on the drop target is working in switch test post a pic on here of the cpu a good one below the batteries

Thanks Chris, have forwarded your message to mate, will post when he gets back to me.

 

[pinballmania]

If you’re not getting anything showing on the switch test when you short a row or column to any other column or row then there is definitely a board fault. Test all the combinations with a jumper. That will tell you which rows and or columns are working or not.

 

[Graham Lowe]

Cheers Andy. My mate would be lost attempting this so I'll have to pay him a visit & see what I can find, thanks again for your help.

If you’re not getting anything showing on the switch test when you short a row or column to any other column or row then there is definitely a board fault. Test all the combinations with a jumper. That will tell you which rows and or columns are working or not.

 

[Graham Lowe]

Just an update to this - went over to mate's this afternoon, board checked out fine so traced wiring & finally found a wire off a stand up target that was hidden behind another still attached to the tag it came off. All working now. Thanks for suggestions.