I/O Led; Replacement Parts And Diagrams - HP 26067A Manual

HP-IB INTERFACE/26067B
4-3. I/O LED
When the interface is powered -up or the printer
is reset the interface performs the HP-IE I/O
self -test and the I/O processor performs some
initial communication with the printer processor.
If the communications is performed satisfactorily
and the HP- IE I/O self -test completes with no
errors the service LED will flash at a 1 Hz rate.
If the interface fails the subtests on power-up,
the led will not flash, remaining either steady on
or off. If the interface pases the I/O subtest but
fails to complete the initial communication
process the service LED will flash at an 5 Hz
ra te. If the service LED is flashing at the 5 Hz
rate a malfunction in the I/O processor or the
I/O control circuitry is indicated. This assumes
that the printer processor circuits are capable of
communicating with the interface. To eliminate
the possibility of a printer circuit malfunction,
the printer standard self -test should be
performed first to ensure the operation of the
printer circuits.
4-4. REPLACEMENT PARTS
AND DIAGRAMS
The replacement parts, diagrams, and schematics
are provided in tables and figures provided on
the following pages.
TABLE 4-2. SERVICE LED ERROR INDICATIONS
LED
ERROR DESCRIPTION
1/2 Hz
FLASH
Interface operating correctly.
5 Hz
FLASH
Passed I/O self-test but failed to communicate
with printer processor (I/O processor or
printer control processor failure)
ON or OFF
STEADY
Interface failed subtest (I/O RAM, ROM, or
HP-IB processor failure likely). Also
front panel cable, can cause this error.
4-3