Some MSX Problems

Supporter (2)

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

Por flyguille

Prophet (3029)

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)

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)

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
Z80A CTC =MK3882N04 1.75
Z80A PIO Z0842004P 1.50
Z80A SIO-0 =MK3884 N04 1.60
Z80B CPU =Z0840006PSC 2.10
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