Research an electric schematic of the mother board for msx vg-8020

Pagina 1/7
| 2 | 3 | 4 | 5 | 6

Door sp4

Master (214)

afbeelding van sp4

19-04-2010, 18:37

Hi, i' m searching the electric schematic of the mother board for msx vg-8020.
Is there someone than can help me to search any links or other material about this
schematic?
Please, for me it's important for repair the mother board.
Thank.

Aangemeld of registreer om reacties te plaatsen

Van Leo

Paragon (1236)

afbeelding van Leo

19-04-2010, 19:12

Van Leo

Paragon (1236)

afbeelding van Leo

19-04-2010, 19:12

did you try msx hans o site ?

Van usuario_msx2

Paladin (755)

afbeelding van usuario_msx2

19-04-2010, 19:18

http://msx.retro8bits.com/

did you try to connect Leo?, many sections are now offline.

Van Leo

Paragon (1236)

afbeelding van Leo

19-04-2010, 20:55

it is explained on the left column of the site. i have not visited the site since last month .

Van RetroTechie

Paragon (1563)

afbeelding van RetroTechie

20-04-2010, 16:39

For what exact type of VG-8020 do you want a schematic? There exist different 'sub-versions' labeled as VG-8020/nn (see label on case bottom). These all look the same on the outside, but can be wildly different on the inside (lots of discrete IC's in some older versions, MSX-engine + just a few IC's in later versions). Obviously you need this info to grab the right schematic. Smile2

Btw. do you have an idea what's broken? Often you don't need any schematic to fix a machine like an MSX1... (speaking from experience here)

Van sp4

Master (214)

afbeelding van sp4

20-04-2010, 18:29

Thank you RetroTechie, my msx model is exactly vg-8235/00.
I have maden any measurement inside it: i have tested the ck-pin of CPU z80, its frequency is 0 Hz,(it's strange) i have maden it with keyboard unconnected. I think than the problem is in the ck generator.
What do you think about this problem ?

Van Jipe

Paragon (1499)

afbeelding van Jipe

20-04-2010, 19:24

the V9938 generate CPUCLCK on pin 8 -> resistor R39 47 ohms -> O in pin 29 S3527 -> O out pin 30 S3527 -> R7 47 ohms -> Pin 6 Z80

Van Leo

Paragon (1236)

afbeelding van Leo

20-04-2010, 19:36

I guess you have you checked +5v as well ?

Van Manuel

Ascended (18082)

afbeelding van Manuel

20-04-2010, 19:39

Hi, i' m searching the electric schematic of the mother board for msx vg-8020.
and then
Thank you RetroTechie, my msx model is exactly vg-8235/00.

oO

Van Repair-Bas

Paragon (1115)

afbeelding van Repair-Bas

20-04-2010, 19:49

CryingCryingCryingCrying

Pagina 1/7
| 2 | 3 | 4 | 5 | 6