Some MSX Problems

incognito ergo sum (118)

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.Hi everybody!

thanx in advance,
Infozoid

Por flyguille

Prophet (3028)

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 (1089)

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

Ambassador (0)

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