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CRT Resistor Array U21
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On the CRT board there is a resistor array U21. This device is a custom film
resistor array in a ceramic 14 pin DIP. It implements 9 resistors.
The HP part number is 1810-0416 and it is used in HP85A/B, HP87A/XM

As I have extensively documented testing of this device both in and out of
circuit in the Series80 forum, all we need is a link to the forum article:

|An example of a HP85A/B CRT repair|


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   <a href="https://groups.io/g/hpseries80/message/9092" target="_blank">An example of a HP85A/B CRT repair</a>