Where to find rom data for fluke combiscope?

[ddavidebor]

Hi, i've a fluke combiscope and it beeps continuously at power on.

I think i need to re-program the rom, but i'm unable to find it in internet.
Anyone knows wherto find it?

[free_electron]

Which combiscope ? There's like 40 different ones...
Roms dom't go bad very often. Those machines use old fashioned eprom.

Id check for missing voltages first.
Get the service manual. The beeps may mean something...

[ddavidebor]

Power supply is ok, and service manual doesn't have a troubleshooting chart.

It power on but nthing happens. Light on, but nothing on screen.

[nctnico]

I'd start checking whether the CPU runs and what the address lines do. Problems like these won't get solved by just swapping components blindly. In the end you can swap all the components without any luck because there is an open trace somewhere on the PCB. Another thing to try is reseating all the socketed devices (=lifting the chips a bit from their sockets and push them down again) .

[free_electron]

indeed, socket parts sometimes give trouble.

[ddavidebor]

Nope, nothing changed.

The cpu sure run, or the buzzer will not work.

Well, i will check the schematics but i'm pretty sure,

[duskglow]

Agree with free_electron.  I think if the ROM were bad it wouldn't be constantly beeping.  That's an error mode of some kind.

[ddavidebor]

It has two firmware one from a mask rom, one from an eprom.

The first with basic start up sequence, the second with operative system.

[ddavidebor]

I'd start checking whether the CPU runs and what the address lines do. Problems like these won't get solved by just swapping components blindly. In the end you can swap all the components without any luck because there is an open trace somewhere on the PCB. Another thing to try is reseating all the socketed devices (=lifting the chips a bit from their sockets and push them down again) .

What you mean by "what the address line do"?

[nctnico]

See if they all toggle every now and then and have valid logic levels. An address line not toggling or having invalid logic levels is a tell tale sign there is a short or a chip is bad. The same goes for the data bus.

[ddavidebor]

Ok thanks!