Printronix SLPA8000 User Manual page 228

Chapter 6
Troubleshooting Other Symptoms
Symptom
Printer fails to turn on, the
display is not backlit, and the
fan is not running.
NOTE: The power supply
delivers +24VDC and
+40VDC. The
controller PCBA uses
the +24VDC to
develop +5VDC and
+3.3VDC for its logic
circuits.
Printer does not initialize, the
display is backlit and a faint
horizontal bar appears on the
top line. No message
displays. The power supply
fan runs constantly.
228
Table 12. General Symptom List
POWER FAILURES
1. Check that printer AC power cord is correctly attached to
the printer and to the AC power outlet.
2. Test AC wall outlet for correct power range. Place the
printer in an area that has the correct power range.
3. Test the AC power cord for continuity. Replace a damaged
AC power cord or one that fails continuity test.
4. Make sure the power supply cable is connected to J17 on
the controller PCBA.
5. Using a voltmeter, test between TP2 +24VDC (+22 to
+26VDC) and TP4 GND on the controller board. If voltage
is not in tolerance, replace the power supply assembly.
6. If +24VDC is good, check TP1 for +40VDC (+35 to
+45VDC). If voltage is not in tolerance, replace the power
supply assembly.
7. If +24VDC and +40VDC are good, test at TP3 VCC for
+5VDC (+4.75 to +5.25VDC). If voltage is not in tolerance
replace the controller PCBA.
8. If all voltages are good so far, test for +3.3VDC (+3.14 to
+3.47VDC) on the center lead of U23 on the controller
PCBA. If voltage is not in tolerance, replace the controller
PCBA.
9. If all voltages are good, replace the Flash SIMM.
1. The Flash SIMM at J38 on the controller PCBA has a poor
connection or is not installed. Reseat or install the Flash
SIMM as required.
2. Using a voltmeter, test for +3.3VDC (+3.14 to +3.47VDC)
between the center lead on U23 and TP4 GND on the
controller board. If voltage is not in tolerance, check for
+5VDC (+4.75 to +5.25VDC) between the top lead of U23
and TP4 GND or between TP3 VCC and TP4 GND. If
+5VDC is in tolerance and +3.3VDC is not, replace the
controller PCBA.
3. If +5VDC is not in tolerance, test for +24VDC (+22 to
+26VDC) between TP2 +24VDC and TP4 GND. If
+24VDC is in tolerance, replace the controller PCBA.
Solution