12 Jul
2011
12 Jul
'11
8:37 p.m.
there are two designs of the relay assembly on the H7140 fiche here,
the old ones parts list has a
Resistor (R1) 3 ohm 5% 7 W 13-14848-00
That's the one shown in the printset on Bitsavers (and in my paper 11/44
printset)
the new one has a sub assembly on that with thermistor listed as
Thermistor 7.0 10% dec part number 13-17198-00
Looks like my guess 'it's a DEC part number' was right.
Waht does the 7.0 refer to here? The cold resistance? If so, it sould be
possible to find soemthign that will work. The physical dimensions of the
original part will give some idea as to the current rating.
Are there any other changs between the 2 versions of the PSU? If you
fitted a 3 Ohm reistor to the later version, would it work correctly?
What was the reason for the change?
Dave Caroline
-tony