Amiga 1080 schematic needed

[RobertB]

Last August I brought an Amiga 1080 monitor to Ray Carlsen for repair.  In the past Ray has repaired many monitors for me and my clubs - 1701's, 1702's, 1084's, 1902's, Magnavox RGB/80's, a Sony GVM-1311Q, and even the monitor in a Commodore Educator.

However, we have run into a roadblock into getting the Amiga 1080 repaired.  Here is what Ray said --

"The [Amiga] 1080 monitor has a "no video" problem and I don't think I can do anything without a schematic. I've searched the Net without any luck. Even the places that sell schematics come up empty. Do you know anyone that may have a Commodore service manual? The monitor was made by Toshiba. Although from the outside it looks like other Commodore monitors, it's very different inside and much too complex to troubleshoot without a circuit diagram. I tried."

So there you have it.  If anyone can help us out with obtaining a 1080 schematic, let us know.

Sincerely,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm
Southern California Commodore & Amiga Network
http://www.sccaners.org

[RobertB]

Is it in the back of the 1080 manual?  Guessing not but will have a look tonight.

Possibly, the schematic is there (though I've never seen the back of a 1080 service manual).

Bingo, found them online.

Schematics are here: http://amiga.serveftp.net/schematics.html#1084

Hope they are for the right version.

Nope, no 1080 there.  I see a 1084 (among others).

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm
Southern California Commodore & Amiga Network
http://www.sccaners.org

[RobertB]

http://gona.mactar.hu/Commodore/monitor/schematics/1080A_Color_Monitor_Service_Manual_3140041-02.pdf

1080A manual not 1080
operator manual
http://www.bombjack.org/commodore/amiga/amiga-commodore/1080_Amiga_Color_Monitor_Instruction_Manual.pdf

No, I need the 1080 schematics, not the 1080A.  The search continues...

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm
Southern California Commodore & Amiga Network
http://www.sccaners.org

[RobertB]

are the schematics in the original 1080 manual?

I have the original 1080 user's manual, the same one as in that eBay sale to which you referred.  However, the schematic would be in the 1080 *service* manual.

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

Does not look like the schematic is going to turn up. The link above might give you a reasonable substitute to look for.

Because the 1080 is built by Toshiba, I don't see how the other monitors built by other different manufacturers would help in this case, i.e., each different monitor would have a different schematic and would not be anything like that of the Toshiba.

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

If Toshiba doesn't have the schematics...

Ah... but which Toshiba?

...then just buy another one...

The point is getting this 1080 repaired (and all following 1080s that need repair).

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Grou
http://www.dickestel.com/fcug.htm

[RobertB]

...nothing beats a good schematic

Agreed!

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

A working 1080 would help for comparing voltages, waveforms etc....

Ray Carlsen responded to the above idea with this --

"Yes, sort of. With both monitors open and running, voltage and waveform checks can be compared. That assumes the tech can follow the signal path. It's still a lot tougher without a schematic, even in a working monitor. It might be worth a shot though. I hate to give up on anything. I think I have a working 1080 myself."

So, there is a ray of hope for my broken 1080.

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

Ray has not given up.  Here is his latest update --

"...your encouragement to compare readings from a working monitor inspired me to try again with yours. With that technique, I did find one IC that seems to have all inputs but one pin has no output. Bypassing that IC brought a picture back so I'm going to order a replacement chip. I say with crossed fingers, you may get a working monitor back. :-)"

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

It's fixed!  This is what Ray had to say about it --

"...your monitor is repaired! A bit of luck was involved as the problem was localized to the rear interface board where one IC resides... and one part of it was indeed bad. I just got a few of those chips in and that fixed the video problem. Yay!"

Now all I have to do is to drive up to Washington State and pick it up from Ray.  

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

Hopefully the $damage$ is not too great.

Heh, because I'm a regular customer, Ray gives me a discount.  

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

Gotta beat Washington DC area traffic, and all this snow around the northeast right now!

The traffic around Portland, OR isn't so great, either.  Especially if it's raining (which it does a lot of) or if there's snow.

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm

[RobertB]

1080 schematic now on-line.  See the thread at

http://www.amiga.org/forums/showthread.php?p=788109#post788109

FCUG celebrating 33 years,
Robert Bernardo
Fresno Commodore User Group
http://www.dickestel.com/fcug.htm
July 18-19 Commodore Vegas Expo v11 -
http://www.portcommodore.com/commvex