seybon
New member
Defender Upright Not Starting Up - CPU/Video Board Problem
I am a newbie on this site and also a novice when it comes to electronics. I have a soldering station but am not too good at soldering (beginner with shaky hands, lol). Am pretty good with trouble-shooting and dealing with schematics (worked on pneumatic controls and pumps for over 18 years). Like working on old classic cars.
A couple of weeks ago I bought a Defender Upright on eBay for $108. It has a different monitor than the G07 and needs a Flyback kit that I am ordering once I know the monitor type in it. Also, it has a rigged-up ATX Power Supply in it from a PC Computer.
I switched out the CPU/Video board and the monitor from my Defender Cocktail Machine and all works fine, so I have narrowed the problem to the both the monitor and the CPU/Video Board.
I will deal with the monitor and want to focus this thread on the CPU/Video Board. I know that I am going to need a Logic Probe, s I will be ordering that too. I do however have a DMM for testing if that can help.
The battery Pack/Case on the CPU Video Board was toast, so I bought a plastic one from Radio Shack and soldered longer wires to the board and will put the battery pack/case on the floor away from the board (thanks Yellow Dog for that tip).
Symptoms:
When I plug the machine in, there are no sounds, there are 4 lights that stay on on the ROM board, and the monitor is blank but glowing at the flyback (cocktail monitor). When I press the reset button on the CPU/Video Board nothing happens that I could visually see, not even a flicker of the 4 LEDs on the ROM board.
It seems that I need to start with a Logic Probe going through the Logic Probe Troubleshooting Flow Chart, as it seems to be a problem with the Reset Circuit. Can I do any testing with a Digital Multimeter here?
Also, the RAMs on the board are not 4116s or 4164s, but a combination of mostly 8119WP and 8109. What gives on this? Is this someone just putting in random RAM IC's?
I also have another CPU Video Board that is in bad shape with corrosion, but the RAMs in the are all 4716 except one of the RAMs is 8409.
Any help/suggestions in the right direction would be appreciated.
Thanks
I am a newbie on this site and also a novice when it comes to electronics. I have a soldering station but am not too good at soldering (beginner with shaky hands, lol). Am pretty good with trouble-shooting and dealing with schematics (worked on pneumatic controls and pumps for over 18 years). Like working on old classic cars.
A couple of weeks ago I bought a Defender Upright on eBay for $108. It has a different monitor than the G07 and needs a Flyback kit that I am ordering once I know the monitor type in it. Also, it has a rigged-up ATX Power Supply in it from a PC Computer.
I switched out the CPU/Video board and the monitor from my Defender Cocktail Machine and all works fine, so I have narrowed the problem to the both the monitor and the CPU/Video Board.
I will deal with the monitor and want to focus this thread on the CPU/Video Board. I know that I am going to need a Logic Probe, s I will be ordering that too. I do however have a DMM for testing if that can help.
The battery Pack/Case on the CPU Video Board was toast, so I bought a plastic one from Radio Shack and soldered longer wires to the board and will put the battery pack/case on the floor away from the board (thanks Yellow Dog for that tip).
Symptoms:
When I plug the machine in, there are no sounds, there are 4 lights that stay on on the ROM board, and the monitor is blank but glowing at the flyback (cocktail monitor). When I press the reset button on the CPU/Video Board nothing happens that I could visually see, not even a flicker of the 4 LEDs on the ROM board.
It seems that I need to start with a Logic Probe going through the Logic Probe Troubleshooting Flow Chart, as it seems to be a problem with the Reset Circuit. Can I do any testing with a Digital Multimeter here?
Also, the RAMs on the board are not 4116s or 4164s, but a combination of mostly 8119WP and 8109. What gives on this? Is this someone just putting in random RAM IC's?
I also have another CPU Video Board that is in bad shape with corrosion, but the RAMs in the are all 4716 except one of the RAMs is 8409.
Any help/suggestions in the right direction would be appreciated.
Thanks


