[time-nuts] Wanted - Service Manual for Solartron 7150+ DMM
alan.melia at btinternet.com
Tue Jul 21 14:11:03 UTC 2009
Did either of you guys find a source of the Schaffner input socket at a
reasonable price (ie less than twice the cost the 7150 sells for on eBay
:-)) ) I have a "spares box full of one that only needs a replacement
fiter.....iif I cant get the right one I will bodge something up. I do have
a service manual of sorts its usable though I recollect not a brilliant
----- Original Message -----
From: "Philip Pemberton" <lists at philpem.me.uk>
To: "David C. Partridge" <david.partridge at dsl.pipex.com>; "Discussion of
precise time and frequency measurement" <time-nuts at febo.com>
Sent: Tuesday, July 21, 2009 1:01 PM
Subject: Re: [time-nuts] Wanted - Service Manual for Solartron 7150+ DMM
David C. Partridge wrote:
> As and when you get a chance to look and if you find it I will be
Still arguing with the bootloader on my Windows/Linux box,
unfortunately. It'll boot Linux more than happily, but GRUB's
"chainloader" isn't passing control over to the XP bootloader properly. Ugh.
> There are a few differences on the floating board - different uP and a few
> other differences. The uC is an HD637B01V0P which is a one time
> programmable uC. Can be replaced with UV erasable HD637B01V0C if you can
> find on that is (hen's teeth).
Huh. Didn't spot one of those when I last had mine open (to clean up the
mess from, and replace an incendiary mains filter), but then again I
wasn't looking specifically at the floating board.
Though truth be told, if you had a copy of the ROM contents for that
thing, you could replace it with an FPGA and a few other bits on a
"bodge board". Most of the "other bits" would be related to
bootstrapping the FPGA (basically you'd need a serial config ROM, e.g.
an Altera EPCS or Xilinx Platform Flash) and running the oscillator.
You're probably talking £5 FPGA + (maybe) a cheap ROM + £2 worth of 74xx
logic (level translators + oscillator) and a PCB. Maybe £30 total parts,
less if you built the PCB yourself.
I dumped the main ROM from the controller board *years* ago; it's on
Bruce Lane's FTP archive (ftp.bluefeathertech.com) under
electronics/testgear/solartron/firmware. That's a 27128, and not hard to
What's actually wrong with your 7150+?
> If you make an appropriately wired adapter from 40 pin to 28 pin I think
> could probably read the internal ROM as if 27256.
Probably. Is it soldered down?
The datasheet doesn't mention any form of security / code protection,
which is nice... :)
Reading out the ROM shouldn't be a problem at all -- replacing the chip
on the other hand...
lists at philpem.me.uk
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
and follow the instructions there.
More information about the time-nuts