Turn-On Self Test - HP 6034A User Manual

5-63 For most failures the front-panel LED indicators (ex¬
cept SELF TEST) will flash on and off. Flashing indicators
always indicate a fault., but, because flashing is controlled by
the microcomputer, a failure in the kernel of the microcomputer
may cause the indicators to remain on in code without flashing.
NOTE
Because the unit is testing itself, it is not possible
to guarantee that the unit will provide an unam¬
biguous indication of all possible failures. For ex¬
ample, a failure in the hardware used for self test
or in the core of the microprocessor may prevent
the unit from indicating that it has not passed self
test. If the unit appears to he inoperative, but it
does not indicate failure of self tests, it should be
removed from the operating system and the user-
should follow the procedures given in the main
troubleshooting tree. Figure 5-16.
5-64 Passing all self tests indicates that the 6034A can
function at least paritally, Self test cannot verify the HP IB in¬
terface without use of a computer, nor can it verify the front-
panel controls without someone to operate them. This type of
check can be performed with use of the optional service soft¬
ware package. Also, self tests cannot check calibration or
whether the power mesh can provide full power output. For
these checks, use the performance tests given in the beginn¬
ing of this section.
5-65 Self tests can help eliminate some circuits as fault
locations, and they can help locate a fault to certain circuits,
but self tests generally will not indicate reasons for a fault.
Users without extensive 6034A experience are advised to use
the troubleshooting trees and follow all procedures step by
step.
5-86 Test mode also enables use of signature analysis
techniques for troubleshooting, and it allows testing of the
front-panel LEDs. Table 5-3 shows the status of various LEDs
for each of the test mode conditions.
5-67 The following paragraphs describe use of each of the
diagnostic and troubleshooting procedures provided with the
6034A.
5-68 Turn-On Self Test. The self tests performed at turn¬
on takes less than one second to complete, and all front-panel
indicators are on while the tests are in progress. If the unit is
not in test mode and it passes the tests, the front-panel in¬
dicators will turn off and the unit will be ready for operation.
The SRQ indicator will remain on until the unit is serial polled
in response to its power-on service request. If the unit fails the
tests, refer to Figure 5-9 to decode the reason for the failure.
Proceed to the main troubleshooting tree, Figure 5-16. Note
that the unit will not respond to a serial poll if it fails turn-on
self test, even though the unit will set. SRO..
5-69 Test Mode Self Tests.To access the additional self
test available in test mode, proceed as follows:
a. Turn off the 6034A.
b. Disconnect all loads from the 6034A output terminals
and disconnect the 6034A from the HP!8.
Output voltage will rise to 60 volts during part of
the test mode self tests. In addition to the per¬
sona! hazard of this potential, a voltage-sensitive
load attached to the output terminals may be
damaged, and the 6034A will fail self tests. In ad¬
dition, the controller may get hung up waiting for
the 6034A to respond. Do not invoke test mode
with the 6034A on line in an operating system.
c. Connect the sense terminals for local sensing if they
are not already so connected.
d. Press the OUTPUT ADJUST pushbutton switch while
turning on the 6034A. Continue to press the OUTPUT
ADJUST switch for at least
214
seconds but not more
than 5 seconds after turn on. If the unit has entered
test mode, the SELF TEST indicator and all segments
of the VOLTS and AMPS displays will remain on after
■ " the OUTPUT ADJUST switch is released, and the
VOLTAGE indicator will flash on and off to indicate
that self tests are being performed, If the OUTPUT
ADJUST switch is held for too long or not long
enough, the unit wil revert to normal operating mode
(assuming it passes turn-on self tests).
Table 5-3. lest Mode LED Status
SELF
TEST
LED
VOLTAGE
LED
CURRENT
LED
ERROR-
CODED
LEDs* Mode
On Flashing
Off Off
Running Self Tests
On Off Off Flashing Self Test Failed
On Off
Flashing Off
Signature Analysis
On Off** Off** Off** LED Test
Off
X X
X
Normal Operation
*RMT, LSN, TLK, SRQ, OVP, OTP, and UNREGULATED.
**One LED may be on if RPG has been rotated.