Hi, my CBM 3032, late 1979, is no more working. The screen now is dark.
No more *** commodore basic 4.0 ***.
I have some spare chips, but unfortunately i'm no more able to find the 
schematic diagram.
Could someone tell me a site where to find the schematic in PDF or sending 
it ?
Guidelines are also highly appreciated.
Thank you all.
Robert 

Roby ha scritto:
> Hi, my CBM 3032, late 1979, is no more working. The screen now is dark.
> No more *** commodore basic 4.0 ***.

Huh? Looks like you updated the original ROMs to BASIC 4.0 :-)


> I have some spare chips, but unfortunately i'm no more able to find the 
> schematic diagram.
> Could someone tell me a site where to find the schematic in PDF or sending 
> it ?

Funet used to host tons of Commodore schematics and other useful 
information. Search the archive, now hosted here 
ftp://ftp.zimmers.net/pub/cbm/


> Guidelines are also highly appreciated.

It could be a million things... try replacing socketed chips one by one 
first, then check if correct voltages reach the motherboard. If voltage 
is ok try replacing the 6502 first, then ROMs. Remove the PIAs (6520): a 
broken PIA may cause a black screen while the PET is able to boot 
correctly even without them (parallel port and keyboard won't work 
though). A replacement VIA (6522) can be found in VIC-20s and 1541s 
(usually socketed). Then you may wish to check the 4116 RAMs too just in 
case one of the chips in a critical memory area failed. If they are 
socketed you can easily test them in another machine (such as an Apple 
II+ or a Spectrum) or scramble them. If I remember well the 2001/3001 
series can still run with as little RAM as 4K, provided they are placed 
in the correct sockets.

*Gabriele*
-- 
   ::::::::
  ::::::::::
:::::     :::::::    _______________________________________
::::      ::::::
::::      ::::                 Commodore 64 Italia
::::      ::::::       http://www.c64italia.altervista.org
:::::     :::::::    _______________________________________
  ::::::::::
   ::::::::          0101001001010101010011000100010101010011
_-�-_-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-

Thank you for the great help.
Yes, it is fully upgraded, Basic 4.0, additional Toolkit Rom, 32k Ram, as
well a shiny 2031LP floppy drive.
Unfortunately it has a 9" CRT, not the 12".
I worked a lot (and played too) with this milestone of the PC history.
I will start to check as you suggested.
Thank you again.
Ciao.
Roby

"Gabriele72" <Arel72togli_questa_parte@email.it> ha scritto nel messaggio 
news:44ec95ae$0$15881$4fafbaef@reader2.news.tin.it...
> Roby ha scritto:
>> Hi, my CBM 3032, late 1979, is no more working. The screen now is dark.
>> No more *** commodore basic 4.0 ***.
>
> Huh? Looks like you updated the original ROMs to BASIC 4.0 :-)
>
>
>> I have some spare chips, but unfortunately i'm no more able to find the 
>> schematic diagram.
>> Could someone tell me a site where to find the schematic in PDF or 
>> sending it ?
>
> Funet used to host tons of Commodore schematics and other useful 
> information. Search the archive, now hosted here 
> ftp://ftp.zimmers.net/pub/cbm/
>
>
>> Guidelines are also highly appreciated.
>
> It could be a million things... try replacing socketed chips one by one 
> first, then check if correct voltages reach the motherboard. If voltage is 
> ok try replacing the 6502 first, then ROMs. Remove the PIAs (6520): a 
> broken PIA may cause a black screen while the PET is able to boot 
> correctly even without them (parallel port and keyboard won't work 
> though). A replacement VIA (6522) can be found in VIC-20s and 1541s 
> (usually socketed). Then you may wish to check the 4116 RAMs too just in 
> case one of the chips in a critical memory area failed. If they are 
> socketed you can easily test them in another machine (such as an Apple II+ 
> or a Spectrum) or scramble them. If I remember well the 2001/3001 series 
> can still run with as little RAM as 4K, provided they are placed in the 
> correct sockets.
>
> *Gabriele*
> -- 
>   ::::::::
>  ::::::::::
> :::::     :::::::    _______________________________________
> ::::      ::::::
> ::::      ::::                 Commodore 64 Italia
> ::::      ::::::       http://www.c64italia.altervista.org
> :::::     :::::::    _______________________________________
>  ::::::::::
>   ::::::::          0101001001010101010011000100010101010011
> _-�-_-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-�-__-