Atari Pole position issues

[phantom-menace]

Hi ,

Looking for some help and advice please.

Presently the machine is stuck in test mode even when test switch is off.

In test mode the accelerator pedal works but I have no steering and low/ high gear is stuck on high.

Ram OK ROM OK

I've tested the voltage at the optic board and pin 2 reads 4.5v

I reseated Custom 53 at position 9K
likely the custom - read that the
Custom IC 9K on CPU PCB is responsible for steering???

Also, read to check the 4584B IC at 8L - schmidt trigger input inverter ic

This was my initial problem not able to steer during gameplay, however, it's now appears stuck in test mode.

Any ideas please

PM

 

[Mr20to5]

Has this ever worked correctly, or was it bought as a non-worker.

What are the voltages like on the main boards?

Are they Atari boards or Namco?

 

[phantom-menace]

Has this ever worked correctly, or was it bought as a non-worker.

What are the voltages like on the main boards?

Are they Atari boards or Namco?

Yes it's been running fine.

It's an Atari board

In fact, the board was Mark Haysman (retroclinic) test board and it's in really good condition.

The actual game runs. The initial problem was the steering that has stopped functioning and now I've put the machine in test mode can't get it out of test mode.

I'll check the voltages on the board tomorrow

 

[phantom-menace]

Has this ever worked correctly, or was it bought as a non-worker.

What are the voltages like on the main boards?

Are they Atari boards or Namco?

Yes it's been running fine.

It's an Atari board

In fact, the board was Mark Haysman (retroclinic) test board and it's in really good condition.

The actual game runs. The initial problem was the steering that has stopped functioning and now I've put the machine in test mode can't get it out of test mode.

I'll check the voltages on the board tom

 

[phantom-menace]

Also, I swapped the opto coupler for two others that I have and they too didn't make a difference so it can't be the opto coupler.

 

[Mr20to5]

And I take it, you have checked the actual test switch itself, both physically and electronically? . In that the wires are in situ, the switch loom has continuity from start to end, etc.

Just to rule out the simple stuff first.

 

[phantom-menace]

And I take it, you have checked the actual test switch itself, both physically and electronically? . In that the wires are in situ, the switch loom has continuity from start to end, etc.

Just to rule out the simple stuff first.

Checked the test switch and that switches on and off.

Checked the power to it via the black and white wires and reads 5v

Checked the continuity of both wires that run to separate edge connector pins and both test ok for continuity.

The game boards test +5v
The ARII BOARDS both test +5v at C1

+10.3 reads 11.1 under load
SPKR1 = 4.8
SPKR2 = 4.8
+sense = +5.3v
-sense = zero

Looking at the back of the ARII board and it's had a sense mod done on J7

All +5v test points on gameboard read +5v across the board

Found two reset tabs on the board rather than a button.

If I short these two tabs will that reset the board?....or leave alone!!!