4-14 INITIAL TROUBLESHOOTING AND BOARD
ISOLATION PROCEDURES
Initial troubleshooting procedures for the power supply are
given in the flow chart of Figure 4-5. The procedures first
ensure that an ac input failure is not causing the problem
and that the supply passes the power on self test. The
normal power on self test indications are described in
Section III of the Operating Manual.
If the supply passes self test, the procedures check to see if
each output channel can be programmed from the front
panel and from the GPIB controller and if calibration is
required. If the supply passes all of these tests, you are
referenced to a table at the end of this section that lists
various troubles and remedies not covered by the flow chart.
4-15 Power-On Self Test
The power-on self test sequence performs tests on the GPIB
board as well as on each output board in the supply. Table
4-3 lists the tests, the boards tested, and the error message
that appears on the display if a particular test fails. Note that
two of the output board test (the RAM and ROM tests) are
performed even when jumper W201 is installed in the SKIP
SELF TEST position of connector P201 on the GPIB board
(see paragraph 4-16). The other eight tests are skipped (not
performed) if W201 is installed in the SKIP SELF TEST
position.
If any board fails power-on self test, the OUTPUT ENABLE
line (U312-22) is held high which keeps the ON/OFF, line
(U327-25) low. For this condition, the supply will not
respond over the GPIB and none of the output boards will
operate.
When W201 is installed in the SKIP SELF TEST position in
service connector P201 o the GPIB board, a circuit problem
that could have been detected with the self test will no
longer cause the GPIB board to prevent the outputs from
operating.
4-7
_____________
If the supply does not pass self test as indicated by a blank
display, the flow chart isolates the problem to either an ac
input problem, a defective GPIB board, or a defective
display.
If the supply does not pass self test as indicated by a power
on self test or ERR message, the flow chart isolates the
problem to the GPIB board, one of the output boards, or to
cabling.
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
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