Sirius
Member
Just an update and a question, I replaced all of the connectors on the MPU and driver board. Added ground wires and led's. Replaced 3 transistors which control 3 lights and got 2 out of 3 working. Replaced misc bulbs and made some adjustments to the roto wheel. Replaced the caps on the PS. It still needs some work because it will sometimes seem to lock up and not spin, or perhaps the solenoid is getting weak? The other problem is with the displays. Players 1 and 2 and the credit/ball display will not display the #9. They display the #1 instead.
According to the pin repair guide, and I quote... "There is also a circuit that makes number "1" to be shown with an extra eighth segment in the middle of the digit instead of the usual two right side segments. This is done with chips Z13/Z14/Z15 on the CPU board. Suspect those if there are problems in showing number "1".
So I have to assume that if it displays the #1, the circuit is working correctly? The other statement in the guide says...
"The displays are controlled by CPU spider chip U6 and a few TTL chips. The 7-segment decoders Z16,Z17 (7448) control the digits for the displays. If the displayed numbers look strange then one of these chips is probably bad. Chip Z16 controls player 1/2 displays and the credit/ball display, while Z17 handles player 3/4 displays".
So, would I be correct in assuming that Z16 is the problem? I need to order the TTL's and their a bit pricy, so I'd like to get it right before attacking the board with a soldering iron. Any suggestions would be appreciated. This pin really turned out to be a good buy for $200 and I'm glad I decided to take a look at it. Although I really feel that Gottlieb dropped the ball when is comes to the sound.
According to the pin repair guide, and I quote... "There is also a circuit that makes number "1" to be shown with an extra eighth segment in the middle of the digit instead of the usual two right side segments. This is done with chips Z13/Z14/Z15 on the CPU board. Suspect those if there are problems in showing number "1".
So I have to assume that if it displays the #1, the circuit is working correctly? The other statement in the guide says...
"The displays are controlled by CPU spider chip U6 and a few TTL chips. The 7-segment decoders Z16,Z17 (7448) control the digits for the displays. If the displayed numbers look strange then one of these chips is probably bad. Chip Z16 controls player 1/2 displays and the credit/ball display, while Z17 handles player 3/4 displays".
So, would I be correct in assuming that Z16 is the problem? I need to order the TTL's and their a bit pricy, so I'd like to get it right before attacking the board with a soldering iron. Any suggestions would be appreciated. This pin really turned out to be a good buy for $200 and I'm glad I decided to take a look at it. Although I really feel that Gottlieb dropped the ball when is comes to the sound.
