[channelf] Re: Channel F repair...
- From: "Sean Riddle" <seanriddle@xxxxxxx>
- To: <channelf@xxxxxxxxxxxxx>
- Date: Wed, 15 Dec 2004 16:05:08 -0600
Steve-
That's what I did- a short run of RCA-RCA with an RCA-to-f-connector
converter going to an antenna input on my TV. Since my TV has multiple
antenna inputs I didn't need the game/TV switch box, but you could use =
one
if needed.
Fredric sent me a troubleshooting guide, but it's a scan of a faxed
photocopy, and the example pictures are nearly impossible to make out. =
It
tells how to disassemble the unit, then discusses the test cart (the =
only
known cart we haven't dumped) and then shows a bunch of pictures and =
tells
you what to do if you see one of them. It discuss any theory of =
operation
or underlying circuits, so it wouldn't be of any help if the unit =
doesn't
display anything.
Make sure to check the power at the F8 (don't short any pins!). Pin
3 is +5 and pin 4 is +12. They should be +/- 5%. Make sure it isn't
something dumb like the reset button is stuck down. One by one, =
carefully
pry out the socketed chips with a small flat-blade screwdriver, then
carefully reseat them, making sure you are putting them in the right
direction and all pins are going into the socket. Remember, if you =
damage a
chip you're out of luck.
After that, all I can think of is to put an oscilloscope or logic
probe on different signals and see if any look weird, then try to figure =
out
what's causing it.
My unit came with a faulty reset button (wouldn't reset), a broken
hand-controller wire (I replaced the 9-pin cable with an old Atari =
joystick
cable) and a display problem- there is a color shadow just to the right =
of
each pixel. It looks like the chroma and luminance info are slightly
off-sync, but I don't know how to adjust it. I've played with the =
coils,
but that doesn't fix this. If I detune the unit slightly I go into B&W
mode, and the pixels are very sharp. But I cannot get the pixels and =
their
colors to line up. I'm guessing a discrete component (maybe a cap?) is =
bad,
but I don't know enough about it to fix it.
Sean
-----Original Message-----
From: channelf-bounce@xxxxxxxxxxxxx =
[mailto:channelf-bounce@xxxxxxxxxxxxx]
On Behalf Of Steve Rusin
Sent: Wednesday, December 15, 2004 3:28 PM
To: channelf@xxxxxxxxxxxxx
Subject: [channelf] Re: Channel F repair...
Thanks for the response. I think I tried to start Hockey, but I'll give =
it=20
another shot. I'll also check the chips, as I've got it opened up=20
anyway. By and by, it's a system I, with the built in speaker. The =
video=20
wire that is cut is removable from the main board, any idea if I can =
just=20
replace it with a RCA audio cable and them put that into an RCA to=20
F-connector convertor? Or could I replace it with an RCA cable, and =
plug=20
it into a game/TV switch box?
Thanks again,
STeve
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