Search found 8 matches

by Rmzalbar
Fri Jun 12, 2020 7:29 pm
Forum: Hardware and Tech
Topic: 2 prong crazy stiff power switch
Replies: 7
Views: 2093

Re: 2 prong crazy stiff power switch

Maybe, but I worry that a lot of dissolved grease would stay in and foul the contacts, plus it would be full of liquid for a long time. I prefer to open the switch. Is it unsealed enough to drain easily?
by Rmzalbar
Thu Jun 11, 2020 10:55 pm
Forum: Hardware and Tech
Topic: 2 prong crazy stiff power switch
Replies: 7
Views: 2093

Re: 2 prong crazy stiff power switch

I had the exact same thing on my VIC-20. The reason it gets stiff is because the grease in the spring-loaded rocker plunger has stiffened into an extremely high viscosity glue over the decades. It will not cure itself; no matter how long you leave the switch ON, once you stop moving the switch for a...
by Rmzalbar
Tue Oct 22, 2019 12:21 pm
Forum: Hardware and Tech
Topic: Datasette motor control snafu
Replies: 10
Views: 4043

Re: Datasette motor control snafu

My gosh, there it is at the bottom of the page! I don't know how I missed it. Well, I think my scans are better quality at any rate.
by Rmzalbar
Mon Oct 21, 2019 12:56 pm
Forum: Hardware and Tech
Topic: Datasette motor control snafu
Replies: 10
Views: 4043

Re: Datasette motor control snafu

Mine has the most common C64-breadbin-style keyboard with the medium-brown function keys. I do wish it had the PET keyboard, they look so good. We had a PET in the corner of many of my 1st-5th gradeschool classrooms that nobody ever touched except for me. I have a schematic on my lap that shows thre...
by Rmzalbar
Sun Oct 20, 2019 6:40 pm
Forum: Hardware and Tech
Topic: Datasette motor control snafu
Replies: 10
Views: 4043

Re: Datasette motor control snafu

It is 2-prong, NTSC, with a two-compartment RF box. Here are the photos I took last time I had it out: https://photos.app.goo.gl/jWjd287HtowLS2Vw9 Not exactly archival grade - I will take another series with this in mind soon when I open it up to repair a stripped thread. One of the photos is a clos...
by Rmzalbar
Fri Oct 18, 2019 5:34 pm
Forum: Hardware and Tech
Topic: Datasette motor control snafu
Replies: 10
Views: 4043

Re: Datasette motor control snafu

I flipped through my VIC-20 books, and in one of them, found a fold-out schematic that matches my board! I haven't seen this particular version elsewhere on the web. I want to scan it and make it available. Where should I submit it to?
by Rmzalbar
Fri Oct 11, 2019 6:52 pm
Forum: Hardware and Tech
Topic: Datasette motor control snafu
Replies: 10
Views: 4043

Re: Datasette motor control snafu

It is the part number of the transistor that determined the order of the legs. Japan style 2S vs 2N order. The schematic called for 2N3904 / 2N4401 transistors, after tracing the circuit found that the arrangement of pads on the board were for ECB, if you were to just install them per the silkscreen...
by Rmzalbar
Fri Oct 11, 2019 2:48 am
Forum: Hardware and Tech
Topic: Datasette motor control snafu
Replies: 10
Views: 4043

Datasette motor control snafu

Last weekend, acquired a crate of commodore stuff including a beautiful two-pin VIC-20. I've been cleaning and inspecting it, and when I got around to cleaning up the datasette, to my amazement it works! Loads original tapes! Except.. The motor never stops running. Traced the issue to the VIC-20 mot...