Working on a non-working FLASH project and have a couple of questions:

1. There is a fuse holder next to the knocker (see photo) that is connected to the sound board. This fuse (holder) is in series with input fuse F2 on the sound board. Why are these two fuses in series? I can't find this fuse on a schematic. Should it be in the circuit, and if so, what is the current rating?

2. Under the playfield, on the scoring switches at the kickers (slingshots), there are electrolytic capacitors and resistors across the switches. Shouldn't these be disc caps and diodes?

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How do the scoring switches work then? Can you send me a picture of the schematic showing these switches and where/how they are connected to the MPU?

No. It shows the same fuse I have. I don't know what rating the fuse should be. Curious too, why it's even in the circuit, because if you trace the fuse wire to the sound board, it connects to the upper fuse on the board. Redundant?

Thank you for explaining that.

I knew that. My bad. I looked again under that congested area and the RC circuit in on the kicker switch, not the scoring switch. That’s what was so confusing, I thought I saw that on the scoring (matrix) switch. So that’s all good.

Bump my other question: what’s that fuse going to the sound board for, and what should the rating be? Schematic anyone?

Thank you. And I think I might have a guess as to why that separate fuse holder is there. The earlier sound board did not have a F2. The later ones did. So I'm guessing they started installing the newer sound boards in games with the old mounting panel (that had the separate fuse 7F2). It's redundant. See the two sound board schematics....one without F2, and the newer board with F2. Not sure when they stopped producing machines without 7F2.

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That label says "BOTH SOUND FUSES" referring to the 2 fuses on the sound board. There isn't any label for that separate fuse you are showing.

After reviewing the schematics shown in my post #10, and confirmed in post #11, the fuse shown is no longer needed in my machine to protect the sound card.

BTW, the fuse in your picture is not MDL and therefore underrated for the circuit! At least that's better than being overrated.