166

March 7, 1968

A balun board that Steve found on his desk
(no date) that had a bad eyelet on pin 7 has been
resoldered and dc tested.

After running the temperature recorder on the disk
chiller water for the past 22 hours it is clear that
the chiller is behaving properly, i.e.; the temperature
remained constant ±2°F. The original disk alarm (pg. 130)
was probably caused because the alarm thermostat was
set too close to the chillers temp. operating range.
The thermostat setting has been set 3°F higher than
its origianl value of 58°F. The alarm will trip when
the thermostat is set to 48°F. Therefore the thermostat
is set 5°F higher than the present temperature. The
temp. chart is shown below (53°F on the chart
corresponds to 48°F on the thermostat):

[diagram]

The remaining 4 twisted pair on the Ampex
Interface (Klug wires) were replaced by Ted. We are
now trying to find out why the Ampex memory does
not work.

1645 After 4 hours and 45 min. of emergency maintenance
and 5 modules, the Ampex Interface has been fixed.
The bad modules were: 1-B134, 2-B165's, 1-B204, and
1-B630. It is not known why these modules failed.

J. Gleason