Some MSX Problems

Por Infozoid

Supporter (2)

Imagen del Infozoid

29-02-2004, 12:59

Hi everybody!

i recently got a Sony HitBit 75P. I'm happy about it, because
this is my first MSX Computer (i got several C64 and other Commodore Stuff).
But there's a problem. I doesn't work. I connected it via RGB Cable and/or
via RF Cable(found the correct chan) to my TV Set. But theres only a dark screen.
The Power Led is okay. The Caps Led won't work. Does anybody here got some advices
to repair this computer?

thanx in advance,
Infozoid

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Por flyguille

Prophet (3029)

Imagen del flyguille

29-02-2004, 14:00

FIRST: you can try pushing all chips on his sockets.... sometimes the socket got fakes electric contacts

you can try fix, buy a z80 and open the MSX and replace, it is mounted on a socket (in the most of cases), is very easy try that.

if is a msx2, check the battery sulfatation, remplace it with if is needed

check if on the mother got any kind of dust or oxize and clean that with a paintbrush wet in alcohol in the more bad of the cases

Por Repair-Bas

Paragon (1076)

Imagen del Repair-Bas

01-03-2004, 15:29

Hello

Mostly if the power-led burns, in a sony HB-75P msx1 computer the rom is broken. It is very hard to get that rom.
Or the LVA-510 is broken, but that part is expansive and that is not worth to reapair.

Bas

Por Infozoid

Supporter (2)

Imagen del Infozoid

03-03-2004, 19:26

Hi everybody, thanks for your help.

I checked all chips on thier sockets, and nothing worked. I tried to wait for 30 minutes to check if the cpu gets hot. And it got really hot! I think the Cpu is broken. I think i have to buy a new Z80. But which one do i need?

Z80A CPU Z0840004P 2.50 Eur Question
Z80A CTC =MK3882N04 1.75
Z80A PIO Z0842004P 1.50
Z80A SIO-0 =MK3884 N04 1.60
Z80B CPU =Z0840006PSC 2.10 Question
Z80B CTC IC-SCHALTUNG 2.50
Z80B PIO = 0842006PSC 1.50
Z80B SIO-0 =Z0844006 PSC 2.85
Z84C00-06MHZ Z80 MICROPROZESSOR DIL-40 4.00
Z84C00-10MHZ Z80 MICROPROZESSOR DIL-40 4.00
Z84C20-10MHZ Z80 MICROPROZESSOR DIL-40 4.35

Bye
Infozoid

Por Repair-Bas

Paragon (1076)

Imagen del Repair-Bas

03-03-2004, 20:35

Hello

The first one is ok.

Have luck with that part.

Bas

Por Sonic_aka_T

Enlighted (4130)

Imagen del Sonic_aka_T

08-03-2004, 21:50

They still sell those? How cute...

Por Jochem

Supporter (10)

Imagen del Jochem

16-03-2004, 16:30

You'll be surprised in how many embedded systems a Z80 is still used!