The Pinball Diaries

Need to tackle switch 37 (Castle Gate), opto. This is the same number and type of switch that’s been giving me trouble on ToTAN lately.

Checked transmitter with infrared sensor card from Radio Shack, looks okay. Switch matrix always registers as if receiving beam. Checked voltages with multimeter:

Transmitter Black → 0.1V Gray/xxx → 1.5V

Receiver Gray/Yellow → 13V Orange/Violet → 6.4V

6.4? That ain’t right. Tested ‘moat enter’ opto receiver (swtich #41), for comparison:

Gray/Yellow	→	13V
White/Brown	→	12V unblocked
		0.2V blocked

Perfect. Let’s try replacing receiver. Receiver is currently wired like so:

Receiver
Gray/Yellow	→	E
Orange/Violet	→	C

Check this against the manual and ITS BACKWARDS! Doh! Replaced the receiver, wired up correctly, and it works! Yay! This time around I discovered that I could replace the receiver by removing the castle molding and just unscrewing the receiver circuit board from its black plastic mount, rather than removing the castle, moat, and drawbridge assembly like I did last time.

This entry was posted on Saturday, March 9th, 2002 at 11:39 pm and is filed under Medieval Madness. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.