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tempting
to
troubleshoot
the
unit.
The
following
troubleshooting procedures will not check the calibration of
the unit, which can be done with the performance tests given
in the beginning of this section.
5-56
Section VII contains schematic diagrams and compo¬
nent location diagrams to help the user locate components and
test points. Most test points for the power mesh and con
trol board are located on the control board test "fingers",
which are readily accessible at the top of the board. An ex¬
tender board, HP part number 06024-60024, can be used with
the control board to allow easy access to components. A test
connector, HP part number 1251-6016, allows easy connec¬
tion of test probes to the test fingers. Test points on the HP*
IB/microcomputer board consists of stand-up pins to which
test probes can be clipped. Wire loops on the front-panel
printed-circuit board and the HP-IB/microcomputer board
allows connection of test probes to various reference
voltages.
5-57
Initial Procedures
5-58
If the 6034A appears to be malfunctioning, perform
the
following
steps
before
beginning
the
formal
troubleshooting procedures.
a.
Check that input power is available, and check the
power cord and rear-panel line fuse. When replacing
line fuse, be certain to select fuse of proper rating for
line voltage being used.
b.
Check that straps on the rear-panel terminal block
are properly connected.
c.
Check that all connections to the power supply are
secure and that circuits between the supply and
other devices are not interrupted.
d.
Check that the rear-panel HP-IB address switches are
set properly.
e.
If the 6034A fails turn-on self test or gives any other
indication of malfunction, remove the unit from the
operating system before proceeding with further
testing.
5-59
Optional Service Package. Because the 6034A
microcomputer performs the self tests described in the follow¬
ing paragraphs, it can test only those circuits to wh|ch it has
access, and the most thorough tests are performed on circuits
functionally closest to the microprocessor. A service software
package is available to supplement the self tests by performing
some tests and guiding the user through other tests that can¬
not be accomplished by the microcomputer, such as tests of
the HP IB interface circuits. In addition, the cassette tape pro¬
vided in the software package performs many of the steps in
the troubleshooting trees faster and easier than they can be
performed by the user via the computer keyboard.
5-60
Order HP part number 06034-10001 for use with the
HP 9825 computer, or HP part number 06034-10002 for use
with the HP 85 computer. Each service software package in¬
cludes an instruction booklet.
5-61
Self Test and Test Mode
5-62
The 6034A performs a seif test of its RAM, real-time
clock, and ROM circuits each time power is turned on. More
extensive self tests can be accessed in test mode. If the unit
fails any of these tests, the SELF TEST LED remains on and
the other front-panel LEDs light in specific codes to indicate
the nature of the failure. The four LEDs to the left of the meter
display, RMT, LSN, TLK, and SRQ, indicate which test failed
according to the code in Figure 5-9. The OVP, OTP, and
UNREGULATED LEDs, below the meter display, indicate
which section of the test failed, see Figure 5-9. Table 5-2 gives
a brief description of each test and each fault within the tests,
and suggests possible causes of failure.
It should be remembered that the possible fault
areas provided in Table 5-2 are considered the
most likely,
but the list is not necessarily
complete.
LED
ON
0=
OFF
RMT
•
m
m
•
o o
•
LSN
m
m
o
•
•
o
©
TLK
o
» •
•
•
•
o
SRQ
0
•
©
•
o
PERFORMED
AT POWER ON
PERFORMED
IN TEST MODE
o.
TEST FAILURE CODES
3
ON
LED
O 5
OFF
OVP
OTP
UNREGULATED
)
o
O
#
2
o
•
O
3
o
•
•
FAULT
NUMBER
4
«
0
o
5
#
o
•
6
•
•
0
7
•
•
•
b.
FAULT NUMBER CODES
Figure 5-9.
Self Test Error Codes
5-10
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