On Fri, 2 Mar 2012 16:42:59 -0500, "John Smith"
put finger to keyboard and composed:

I straightened the pins and put it in backwards.

At power on there was a click and the readings now are.

1. 0.23
2. 0.32
3. 0.64
4. 0
5. 0.82
6. 3.7
7. 2.57
8. 1.44
9. 3.35

When the IC was installed backwards, pins 4 and 6, and pins 3 and 7,
would have been swapped. This means that the +75V supply would have
been applied to the IC's ground pin via the relay coil. The IC's pin
#7 would have been grounded via a 3K resistor (R367). This means that
Q19's base-emitter junction would have been reverse biased by the +75V
supply, thereby destroying it. Your measurements would suggest that
Q19's B-E junction is now open, which would be consistent with the
expected damage.

Furthermore, the reading at pin #5 (Q20) would suggest that its
connection to the IC's ground (pin #4) has been opened. AFAICS, this
is also to be expected.

- Franc Zabkar
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