HP 8753E Service Manual page 422

PARALLEL PORT NOT AVAILABLE FOR COPY
Error Number You have dellned the parallel port as general purpose I/O (GPIO)
167 for sequencing. The definition was made under the (Local key
menus. To access the pamIle port for copy, set the selection to
. . . . . . . . . i I::
PHASE LOCK CAL FAILED
Error Number An internal phase lock calibration routine is automatically
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executed at power-on, preset, and any time a loss of phase lock
is detected. This message indicates that phase lock calibration
was initiated and the first IF detected, but a problem prevented
the calibration from completing successfully. Refer to Chapter
3, "Adjustments and Correction Constants" and execute pretune
correction (test 48).
This message may appear if you connect a mixer between the
RF' output and R input before turning on frequency offset mode.
Ignore it: it will go away when you turn on frequency offset.
This message may also appear if you turn on frequency offset
mode before you define the offset.
PHASE LOCK LOST
Error Number Phase lock was acquired but then lost. Refer to the "Source
Troubleshooting" chapter.
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1 O-56 Service Key Menus and Error Messages