The knocker on my Strike Zone has never worked since I've owned it. The schematic on ipbd is a scan of mine which is no better. The coil looks fine. The plunger moves freely. The make break switch on the 10 and 25 cent relays look ok. The wires are attached and the switch is properly adjusted on the replay unit EOS switch. I'm not sure where else to check.
https://www.ipdb.org/files/2404/Williams_1970_Strike_Zone_Schematic_Diagram_continuous.pdf
Any help would be appreciated.
The switches that control power to the knocker solenoid are the following:
Replay set up EOS switch - black(?)/white wire and black wire
10 cent relay switch - orange/green wire and orange/red wire
25 cent relay switch - green/orange wire and orange/green wire
25 cent coin switch - yellow/red wire and green/orange wire
Anti-cheat switch - yellow wire and yellow/red wire
First, make sure the switches are clean and adjusted properly. Sometimes you have to "scrub" the switch contacts with a Flexstone file or similar file to get them clean. You can also test to see if the knocker solenoid is working with a multi-meter - should read 2 ohms or higher - or use a jumper wire from the fuse block to activate the solenoid. Or use a 9 volt battery on the solenoid lugs - if it moves the solenoid plunger slightly, then the solenoid is good...
fredsmythson is right, and here's the circuit to inspect and diagnose with Alligator clip jumper wires, starting with the indicated end-of-stroke switch on the Replay Step Up unit.
Pinball (resized).pngThe wire on the make break switch on the 25 cent coin switch had been cut. I used a jumper..went back and activated the credit unit eos swtich and it worked. I used both of your suggestions..fredsmythson for the wire colors and HowardR for the much needed line in the schematic to the coin switches. Thank you both again for your help!!
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Boothwyn, PA