HP 4262A Operating And Service Manual page 253

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Table A. Comparator Keyboard Test Signatures.
Keyboard Switch| U7(3) DO U7(6) D1 U7(10) D2
LCR LIMIT CHK| AF4C AF08 AF08
DQ LIMIT CHK AFOC AF48 AF08
CMP ENA AF0C AF08 AF48
Window Test (+56V): U9FF
To observe window test signature, continue pressing
COMPARATOR ENABLE button for the duration of
the initial window test.
accord with Table A above.
Then, press pushbuttons in
Signatures for each in-
dividual circuit node can be observed while the ap-
propriate button is being pushed.