HP 8562E Service Manual page 285

f. Press the following keys on the oscilloscope:
off
connect
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2v
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..50ms/div
highlight CHAHNEL 1 on
set V/div to 0.2 V and offset to 0.6 V (1O:l probe used)
highlight CHANNEL 4 on
set V/div to 2 V and offset to 0 V
DISPLAY
g. Using a 1O:l probe connected to channel 1 of the oscilloscope, check for activity at pins
10 and 13 of A3U617.
h. If either pin (or both) show no activity, check for activity at pin 21 (LTIMER) of
i. If LTIMER is not active, troubleshoot the Interface Strobe Select circuitry (block K).
j. If there was activity at pins 10 and 13 of A3U617, suspect A3U616.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight grid
off on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight on
off on
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight noxnr