Service manual

20
Table 3-2. Selftest Error Code
Code Error Description Procedure
PRIMARY PART 2 ERRORS
-4 The primary microprocessor U203 read/write test to
the GPIB talker/listener chip U202 failed.
Use Primary SA Test Tables 3-4 and 3-6 to check
address and data lines.
- 5 The primary microprocessor U203 test of the internal
trigger lines failed.
Use Primary SA Test Table 3-7 to check the primary
trigger circuit. Then refer to " Trigger Circuit
Troubleshooting" and Figure 3-8.
- 6 The primary microprocessor U203 test of the ac line
trigger circuits failed.
Same as above.
- 7 The primary microprocessor U203 test of the timer
circuit trigger failed.
Same as above.
SECONDARY PART 1 ERRORS
-101 Secondary microprocessor U301 internal RAM failure. Replace U301.
-102 Either power board disconnected. thermistor RT2
missing or open, or U301 internal ROM failure.
Make sure power board connected. If connected. check
RT2. If O.K., replace U301.
-103 Secondary microprocessor U301 internal timer failure. Replace U301.
SECONDARY PART 2 ERRORS
-104 EEPROM (U342) checksum error. Create a checksum by programming: ''CAL:MODE
ON;:CAL:SAVE" then turn power off, wait; 5 seconds
and turn power on. If error code -104 does not appear
again, calibrate the load as described in the Operating
Manual. If error code -104 does appear again, check the
EEPON
line (test point in Table 3-3). If
EEPON
is ok, use SA Table 3-14 (U341) to check the data input
and output lines to U342.
-105 Main DAC circuit (U320/U326) zero or full scale
point is above the high tolerance level.
Refer to "DAC Circuits Troubleshooting" and
Figure 3-3.
-106 Main DAC circuit (U320/U326) zero or full scale
point is below the low tolerance level.
Same as above.
-107 Transient DAC circuit (U321/U325) zero or full scale
point is above the high tolerance level.
Same as above.
-108 Transient DAC circuit (U321/325) zero or full scale
point is below the low tolerance level.
Same as above.