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Oswald
Registered: Apr 2002
Posts: 5086 |
RF 'channel changer' screw
sorry for the dumb topic name, but I dont know the english terms used here. On my c64 there was a screw so you could change "where" it sends out the signal. So if you turn the screw you have to retune the TV to find the signal. I hope it's clear now.
can you tell me if this type has such a screw, and if so where?
commodore C64G
5v-9v 15w
made in germany |
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Devia
Registered: Oct 2004
Posts: 401 |
Commodore probably had between 6 and 30000000 different sub contracters to produce this part I'm guessing, since I can't really recall seeing two looking exactly alike.
Some have a screw exposed on the c64 backside as you mention, some have a switch exposed while others have nothing exposed. Some have a switch on the exterior of the RF unit, but only exposed to the inside of the c64.. I believe all of them have 1 or more vario caps exposed on the top of the RF unit, but as far as I can see from the schematics I have available, none of them seem to be for channel trimming.
That is btw the name of this function or at least this is how the schematics refer to it: Channel Trimmer.
Why do you need this? |
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Oswald
Registered: Apr 2002
Posts: 5086 |
to change the frequency where the signal is sent to the TV, a hungarian fellow complains that he cant find the c64's signal on a Thomson TV while it works with an NES. |
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enthusi
Registered: May 2004
Posts: 677 |
Quote: to change the frequency where the signal is sent to the TV, a hungarian fellow complains that he cant find the c64's signal on a Thomson TV while it works with an NES.
He should unplug the NES first.
(sorry :) |
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Devia
Registered: Oct 2004
Posts: 401 |
Quoting Oswaldhungarian fellow complains that he cant find the c64's signal on a Thomson TV while it works with an NES.
That actually sounds more like the sync might be out of spec on that particular c64's RF modulator.
I have seen this on some 70's PONG! machines, where the front porch was way to long for some of my TVs (especially LCD TVs) to sync properly.
If you know a capable TV repair man, preferably with a grey beard, he could verify the quality of the signal and maybe even know how to adjust it.
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Oswald
Registered: Apr 2002
Posts: 5086 |
it works with a tuner card, so that should be ok. |
