Reply from Ray Carlsen on power switch foprm 1902A monitor and wiring order on C128
Reply from Ray Carlsen on power switch foprm 1902A monitor and wiring order on C128
Steven,
I still have an account at the University of Washington although
I've been retired out of there for a few years, so I forwarded your
email to my home addy. FYI: my I-link account is no longer active.
I am need of an original Commodore model 1902A power switch and the
cable that attaches to the top of this switch. If a new switch is not
available is there a good way to fix or bypass the switch?
The original Commodore power switch is no longer available and I
wouldn't buy one anyway since they are cheap plastic and fall apart
easily. I do have a few replacement switches in stock that are a close
match but of a higher quality. I don't normally replace the wires
leading up to the switch unless they were damaged somehow, but simply
snip the four wires from the old switch and wire them up to the new one.
The switch can be bypassed by jumpering across it in two places. To see
pictures of the various models of monitors and switches, go to my
website at
http://personalpages.tds.net/~rcarlsen and search out the
schematic pages. There are photos there that show how those power
switches are mounted and wired, and how to jumper them if necessary.
I was unable to see how to get the switch out. How is such done?
Facing the rear of the monitor, the left side slide-out assembly is
held in place by a plastic tab that must be pressed in while the
assembly is pulled back. It's also held by some wiring that must be
disconnected from the power supply board and a wire "braid" that must be
unsoldered from a metal plate.
On the Commodore C128 which is the full model number there is a
connector with 3 wires that looks like it is going to the power on
LED
The motherboard is wired so that connector works either way.
I thought maybe the rattle could be form some thing under the bottom
circuit board (the mother board). .I had some rattling in my
computer and could not find the cause so far after one removes the
top part of the computer and the metal shield how does one remove the
bottom circuit board form this computer?
The motherboard is held down to the bottom half-shell by half a
dozen or so screws around the perimeter of the board. You already
removed some of them when you took off the metal shield. As to what may
be rattling, I suspect one of the plastic "stubs" that the mounting
screws fit into has broken. You'll see if that has happened when you
pull the motherboard. If it's a metal screw that's floating around in
there, you MUST find and remove it before you turn the computer on again.
Where can I get a Commodore C128 service manual
I have schematics on my web sites but not a full service manual for
the 128. Do a Google search... I'm sure you can find one online. Try
www.zimmers.net for a start.
5-1/4 inch and 3-1/2 inch floppy disks and printer cartridges and
paper for the Commodore VIC-1525 printer
Try the newsgroup comp.sys.cbm. Lots of people there buy and sell
Commodore related goods. The 1525 uses a ribbon, not a cartridge, as far
as I remember, and as small as it is, it runs dry rather quickly.
Do you still offer Commodore repair service and if yes on what all
Commodore equipment?
I still do repairs on the C64/128 and CBM disk drives... basically
the stuff I still have parts for. I don't work on printers or Amiga.
In case I have more questions do you have a telephone number
I would prefer people not contact me by phone. My repair work is
more of a hobby than a business, and my spare time is precious to me. I
live in a little town called Ethel in Washington, about halfway between
Seattle and Portland, Oregon. Are you willing to drive that far to get
something fixed? I don't get out much and never drive to Seattle since I
retired. I hate that drive... I did it for 24 years.
Ray
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Steven Bolin Wed, Jan 26, 2011 at 5:46 PM
Steven Bolin <videoperson@gmail.com> Wed, Jan 26, 2011 at 5:48 PM
To: Ray Carlsen <rcarlsen@tds.net>
Bcc:
videoperson@gmail.com
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Sorry my return email address was typed in a little wrong the correct
retrun emai address is
videoperson@gmail.com
- Show quoted text -
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To: Ray Carlsen <rcarlsen@tds.net>
To all: Ray Carlsen <rcarlsen@tds.net>, Note form videohobbieperson I pu t the black wire torwards the fornt of the computer for the power LED on the C128 and it worked fine however I lost one of the casing external screws does anyone know the thread type form such screws?
