Yes, the TC5514 could be faulty, but it would be best to check everything
else first. R17 can definitely cause problems on the data bus. It is eight
10k resistors in an array with one common pin. Measure each one to make sure
it is close to 10k. You really need an oscilloscope to look at the data
lines and make sure the digital signal looks clean. Otherwise you could end
up replacing a lot of parts to find the problem.
Don Backshall
-----Original Message-----
From:
PolySix@yahoogroups.com [mailto:
PolySix@yahoogroups.com] On Behalf Of
Darijo Berkes
Sent: Wednesday, February 29, 2012 5:19 PM
To: <
PolySix@yahoogroups.com>
Subject: Re: [PolySix] Battery leak problem.
I have measured all th traces from CN10 to all IC that has a connection
between D0 to D7 and all is fine.
Could it be that the IC 32 is fault ( no battery acid seems have touched it)
or could it be that the R17 is the problem I haven't changed any of these
two
Regards
Darijo
Sent from my iPad
29 feb 2012 kl. 12:51 skrev "backshall1"
<
backshall1@bellsouth.net<mailto:
backshall1@bellsouth.net>>:
The patch RAM memory chip is IC 32 TC5514 APL-3 on the KLM367 board. It is
very close to the battery. The 8089 on the KLM-366 is the CPU/ROM for the
key assigner circuit as is not related to patch memory.
If you still have two LEDs turned on (7 and 8) when Tape is Disabled, then
you probably still have a problem with a bad trace in the data bus (D0-D7)
on the KLM-267 board going to CN10. This would also mess up the memory
access.
Don Backshall
_____
From:
PolySix@yahoogroups.com<mailto:PolySix%40yahoogroups.com>
[mailto:
PolySix@yahoogroups.com<mailto:PolySix%40yahoogroups.com>] On Behalf
Of
Takio Hosoya
Sent: Tuesday, February 28, 2012 4:17 PM
To:
PolySix@yahoogroups.com<mailto:PolySix%40yahoogroups.com>
Subject: Re: [PolySix] Battery leak problem.
Hi, everyone, I'm one of the newbies from Japan.
I answer this question.
Darijo,
IC 6 is that you want to find.
You can find it under a keyboard assembley on KLM-366B, beneath the IC
there is a blue socket.
This IC is 8089, a famous chip family of Intel 8048.
I don't know it is available in U.S., but you could still find second sauce
ICs.
An example, my Polysix, made in Japan, uses second sauce 8089
manufactured by NEC.
The 2nd sauces are a little different from its original, memory
transfer speed etc.
If you hasitate to use second sauces, you'd better consult Datasheets,
or obtain another one that is used in your Polisix
Good luck!
Takio.H
Japan
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