HP 82718A Service Manual page 37

HP 82718A
Component-Level Repair A-3
Table A-1. Diagnostic Test Error Messages (continued)
If 'mcf BAD', '1LL6 BAD', and 'pod BAD' all appear together, turn the HP-75 off, and monitor U2-40
with an oscilloscope while turning the HP-75 on.
If
Then
The signal changes from a dc level to an ac clock
(1.2 MHz) and remains as a clock signal.
The signal remains at a dc level.
U2 or U28 is bad.
Replace Yl, C7, C8, U15, R14, R15, R22, R23,
C19, C20, C44, C45