Electronics > Repair

How To: Make a new boot disk for your HP 4145B Semiconductor Parameter Analyzer.

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TERRA Operative:

--- Quote from: picburner on August 12, 2024, 04:34:02 pm ---If the file already exists (and in this case it already exists), you can copy it and read it normally from the SD card with any PC.
To create it from scratch, however, you need a software.
It's all explained on the manufacturer's website.

--- End quote ---

I just got my hands on an SD HxC Slim emulator as my floppy drive just died a few days ago... :( (I've just designed an adapter PCB and and getting a set of those made too)
Can you provide the DIP switch and config settings you used in yours?

picburner:
I'll take a shot of my floppy emulator so you can see how the dip switches are configured.
I also had to put a resistor because there were problems with the disk-change, I don't remember where I placed it but if you compare the two pcb you can easily find it


Edit: ...judging from the soldering, the added resistors appear to be 3: R4, R8 and R9.

TERRA Operative:
Nice! Any specific need for 90R, or will 100R or another similar value work?

How did you determine those resistors were needed? I can't find any schematics or other low-level info online...

picburner:
They are 910 Ohm resistors, I used this value because I have several coils of it, but 1KOhm is fine.
These are the pull-up resistors of some floppy-drive lines.

RikV:
Just finished recapping A11,A12,A13,A14,A15 and replaced RAFIs. Have not yet carefuly checked the supply voltages, but it comes alive.
Only now I noticed on the DAC board (A4) there are 2 LEDs constantly on! Certainly not a "normal" situation.
So, up to the service manual. I've been seeking on all pages and flow diagrams: No sign of A4SD1 or A4SD2.
Anyone who knows what error state they indicate. How to solve it? I am not sure about thatus of the LEDs before I recapped, but I guess I would have noticed if they were on... Maybe one of the voltages out of spec after recap?

"Problem" solved: SD1 and SD2 are simply connected to the 15V rails!!Why would HPengineers do that? This is a useles and confusing gimmic. All other LEDs are of real diagnostic value, these are just for the show. I think I will remove them..

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