Service Model 8903B
If Indication Abnormal:
If
one
or
more
LEDs
or display segments
fail,
check the respective components and
drive circuits. See Service Sheet
18.
Also check the CPU
1/0
port. See Service Sheet BD4.
@)
Measurement Error Check
Procedure:
Key in 43.1 SPCL. This enables Service
Errors.
Make the measurement in which the fault appears.
Normal Indications:
As
the Special Function code is entered, 43.1 should appear in the left display. This
indicates that the ControIler responds to keyboard interrupts. After pressing the SPCL key, measurements should
proceed as normal.
If Indication Abnormal:
If
the keys have no effect, check the keyboard interrupt. See Service Sheet
17.
If
the keystrokes produce
an
erroneous display, check the Keyboard. See Service Sheet BD4.
If
the measurement
is
improper
or
error messages appear in the display, consult the error messages tables (see
Error
Messages
in the
Detailed Operating Instructions,
Section
3
and
Error
Messages,
paragraph 8-24)
or
consult the block diagram
service sheet that documents the section of the instrument that appears
to
have the fault (see Service Sheets BD2
through BD5).
NOTE
For
problems that are exclusive to
the
HP-IB,
see Service Sheet
BD4.
8A-8
rev.20JUN87
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