4-14 INITIAL TROUBLESHOOTING AND
BOARD
ISOLATION PROCEDURES
Initial troubleshooting procedures for the power supply are
given in the flow chart of Figure 4-6. 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
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.
If the supply does not pass self test as indicated by a blank
display, the flow chart isolates the problem to either an ac
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
cabling.
4-15 Power-On Self Test
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 tests (the RAM and ROM tests)
are performed even when jumper W201 is installed in the
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
operate.
When W201 is installed in the SKIP SELF TEST position in
4-8
problem to the GPIB board, one of the output boards, or to
The power-on self test sequence performs tests on the GPIB
SKIP SELF TEST position of connector P201 on the GPIB
panel and from the GPIB controller and if calibration is
respond over the GPIB and none of the output boards will
input problem, a defective GPIB board, or a defective
service connector P201 on 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.
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