Greetings, I was wondering if anyone can shed light on this issue.
On a Bally Black Belt (6803), most solenoids controlled by the Solenoid Expander Board are experiencing twitching (slight short movement and/or slight short buzz) when related components are activated.
Example 1:
Flashing the Man Bright Lights unexpectedly causes the Left Drop Target Reset solenoid to twitch.
The reverse is not true: activating the Left Drop Target Reset solenoid does not flash the Man Bright Lights.
Note: Transistor Q16 is used to activate both.
Example 2:
Flashing the Sun Bright Lights unexpectedly causes the Right Drop Target Reset solenoid to twitch.
The reverse is not true.
Note: Transistor Q15 is used to activate both.
Example 3:
Flashing the Right Bright Lights unexpectedly causes the Middle Saucer to twitch.
The reverse is not true.
Note: Transistor Q18 is used to activate both.
There is another pair of components controlled by the Solenoid Expander board that doesn't seem to exhibit the problem. Flashing the Top Left Lights does not cause the Right Kick Back to twitch and vice versa.
Here is a video of the behavior:
In the video, depressing a Lane Return switch causes the Man Bright Lights to flash seven times as expected. But accompanying each flash is a visible and audible twitch of the Left Drop Target Reset solenoid. So the solenoid twitches seven times. And it is twitching, not being fully activated.
The problems in examples 1, 2 and 3 are reproducible during the solenoid self-test.
Also, self-test shows that the Solenoid Expander Board (SEB) is operating nominally: relay clicks on/off and accompanying 555 lamp flashes on/off.
Is it likely to be a faulty Solenoid Expander Board?
Is it likely that the switch contacts on the Solenoid Expander Board's relay need filing/replacement?
If anyone has any suggestions at all, please let me know.
Thank you.
Seattle, WA
Piershil
