HP-23A further notes

[Marten T Beels]

Ok, here are some measurements that I made:

Pin   measured manual      service bulletin
1     26k      22k min     48k
2     open     infinity
3     5-10M    75k min     50k
4     5-10M    75k min     100k
5     open     infinity
6     open     infinity
7     short    0           0
8     open     infinity
9     open     infinity
10    open     infinity
11    20k      10k to 20k  11k

Filter choke resistance is ok at 100 ohms.

transformer windings   proper   measured
black to black         1 ohm    1.2
red to red yellow      2        7.8
brown to brown yellow  1.4      1.5
brown yellow to blue   4.5      4.5
green yellow to yellow .2       0-.1
green yellow to green  .1       0-.1
green to yellow        .1k      .2

Everything looks ok, except for green to yellow which is .2 ohm but should
be .1k.  I think that is a typo, though.

So I think that the transformer is good.

The diode checker on my multimeter reports that the diodes are good, but maybe
I should replace them anyway.  I checked the resistors, and they are within
spec.  Any other thoughts, anyone?

Thanks for your help,

Marten

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