Problem Using a Commodore 1084s Monitor on a IIgs

[Polymorph <polymorph69@hotmail.com>]

Hi All,

If you've not been following another other thread that I started, my
daughters IIgs monitor died just before Christmas and I've been
attempting to repair it. Although I made it better, its still not
perfect.

Because of this I picked up a Commodore 1084s monitor off of eBay to
use as a replacement. I have tested the monitor with a DVD player and
the image produced was quite good, so I know the monitor is working.
However, I wired up a cable as per the Apple II FAQ over the weekend
and had troubles getting the monitor to synch with the RGB signal. The
image just kept scrolling all over the place. I tested the cable, and
everything seemed to be wired correctly.

In an attempt to fix the problem, I tried:
(i) to wire the IIgs's composite synch to the horizontal synch
(ii) switch the monitor between 50Hz and 60Hz

None of the above made any difference.

One thing I should note is that just about everywhere lists the 1084
monitors D-9 RGB connector as being female, however in the monitor I
have it is male. Consequently, my cable has a female D-9 socket. I
have made the assumption that the wiring would still be the same (i.e.
pin 1 mentioned in the A2 FAQ is pin 1 on my monitor). This seems to
be true as I do not think I would get the image that I am getting if
it were incorrect. It just seems to not be synching with the signal.

So I did some snooping around in the c.s.a2 newsgroups looking for
threads on using 1084 monitors with the IIgs. I found a post by Jeff
Blakeney in the mid-1990's mentioning the usage of a 75 Ohm resistor
wired between the composite synch and ground to alter the voltage to
more acceptable levels for the 1084 monitor. Most other posters using
a 1084 don't mention any requirement for doing this, and the Apple II
FAQ doesn't mention it either. But I plan on giving it a try once I
get a chance on getting to my local electronics dealer.

To gauge the likelihood of success, has anyone else had to use a 75
Ohm resistor in this manner to get a 1084 to synch with the IIgs? Is
there anything else I can try to get the image to synch?

Thanks,
Mike