hw keyboard failure

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By Jipe

Paragon (1594)

Jipe's picture

29-09-2012, 11:32

you can simul the keybord with a wire ( fil en français )
connect /X? and /Y? (? are number) directly at keyboard connector and see on screen the result

By jltursan

Prophet (2619)

jltursan's picture

29-09-2012, 12:51

No near friends with a similar machine (HB-10P, HB-20P, HB-101P, etc.) to test the keyboard plate?. It would be the fastest solution...

By PingPong

Prophet (4093)

PingPong's picture

29-09-2012, 13:00

jltursan wrote:

No near friends with a similar machine (HB-10P, HB-20P, HB-101P, etc.) to test the keyboard plate?. It would be the fastest solution...

unfortunately no...

By Eugeny_Brychkov

Paragon (1232)

Eugeny_Brychkov's picture

29-09-2012, 13:28

Hi-res pictures of the keyboard's board and film with conductors please so that we can see how keys are connected on the film (top and bottom if possible)

By hit9918

Prophet (2927)

hit9918's picture

29-09-2012, 16:00

run the below app, if it responds to the Return key, then the PPI pin is ok.

on bit 7, the BIN$ wont print a 0, but the printing will shift one position to the left.

10 n = inp(&haa) and &hf0
20 out (&haa),n or (6 + 1)
30 a = inp(&ha9)
40 ?bin$(a)
50 goto 20

By PingPong

Prophet (4093)

PingPong's picture

29-09-2012, 17:46

hit9918 wrote:

run the below app, if it responds to the Return key, then the PPI pin is ok.

on bit 7, the BIN$ wont print a 0, but the printing will shift one position to the left.

10 n = inp(&haa) and &hf0
20 out (&haa),n or (6 + 1)
30 a = inp(&ha9)
40 ?bin$(a)
50 goto 20

Thks hit 9918, i wrote a similar program, but unfortunately because of a bug i've not been able to check the bit. Your version showed me that the ppi is ok

By hit9918

Prophet (2927)

hit9918's picture

29-09-2012, 19:40

So it smells like on the keyboard itself the X7 wire between return key and F3 is broken.

By PingPong

Prophet (4093)

PingPong's picture

29-09-2012, 21:12

hit9918 wrote:

So it smells like on the keyboard itself the X7 wire between return key and F3 is broken.

Yes, practically all keys related to bit 7 except return key and right cursor keys never work.
i will try probing each line to know what's is wrong...

By NYYRIKKI

Enlighted (6016)

NYYRIKKI's picture

30-09-2012, 12:13

hit9918 wrote:

So it smells like on the keyboard itself the X7 wire between return key and F3 is broken.

I would say that because of physical layout of keys, the wire goes from "RET" to ";" and it is broken somewhere in between. Use multimeter (or eyes) to find what two wires are connected between "RET" and "RIGHT" then measure what two wires are connected between ";" and "J" When you have found those connections, connect them together by placing jump wire between "RET" and ";"

If there is keyboard film similar to MSX tR then you may use something like this to fix the connection:
http://www.techspray.com/product-info.php?pId=95&aId=6

By PingPong

Prophet (4093)

PingPong's picture

30-09-2012, 12:30

NYYRIKKI wrote:
hit9918 wrote:

So it smells like on the keyboard itself the X7 wire between return key and F3 is broken.

I would say that because of physical layout of keys, the wire goes from "RET" to ";" and it is broken somewhere in between. Use multimeter (or eyes) to find what two wires are connected between "RET" and "RIGHT" then measure what two wires are connected between ";" and "J" When you have found those connections, connect them together by placing jump wire between "RET" and ";"

If there is keyboard film similar to MSX tR then you may use something like this to fix the connection:
http://www.techspray.com/product-info.php?pId=95&aId=6

thx nyyrikki, now it's clear that the problem is keyboard related. otherwise the two keys (right cursor/enter) never worked. all others are dead. ASAP i will dismount the keyboard and check every connection.
the keyboard is "cased" in a alluminium/metallic 'case' from which is connected the flat cable that goes to mother board.
I've never opened it, so i must take special care when opening

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