Help Please with White's Coinmaster Classic II

[SVEN1]

I picked up a circa 1990 Coinmaster Classic II for $15.00
It did not work, looks like some water damage?
Had to change out the disc pot, on/off sensitivity pot and pinpoint reset
toggle switch.
Power gets to the board, still will not function.

What would be the next thing to check? And is it even worth trying to repair this unit?
Thanks

[kt315]

Sven, I fixed CZ-5 also was water damaged, some IC's was so corrupted I would be changed them all. I see some resistors on your board have oxided pins... change them all off... wash PCB by flux aerosol remover like to Flux-Off...

[SVEN1]

Please look at the traces

Please take a look at the traces, looks like small bubbles?
Or is that ok?

[kt315]

that is OK. do not worry about the traces.

[SVEN1]

Found something interesting

I have a newer main board (parts board) from a newer Classic ID 1998.
Looking over the parts of both the old 1990 Classic II and the newer Classic ID, I see the majority of the parts are the same. Good news for me--parts.

Looks like I'll need to change out the part U1, it's a LF441CN.
The Classic ID uses a Philips NE5534N. Looks like that is the newer replacement part?

Also noticed there is a spot on the old Classic for a threshold trimmer pot and a few other additions.

Amazing how the old Classic is 1/4 the size as the new Classic ID. It appears the Classic Id has all the components spaced out further apart.

[SVEN1]

Removed all the resistors with oxidation, a few just fell apart when desoldering.
Just wondering, the other ones look OK. Just for the sake of it, should I change them all out?

I removed the LF441CN because of the oxidation also. There are some caps and some other parts in the area that the resistors were removed from. I can change these out also or just leave them in place for now?
I have identical parts I can switch them out with.

Interesting project...........
Thanks for any help........

[thepest]

Did It Work ?

hi Sven....
I lnow this post is old, but was your repair successful???? did much more have to be done??? this is a cliff hanger for me
anthony

[SVEN1]

Scrapped it, the traces started to come away from the PCB back, decided not worth the time and money. Too many other projects to tinker with.
http://www.treasurelinx.com/projects.html