Printronix T3204 Maintenance Manual page 53

Step Check Item
10. Locate the AC filter module assembly.
WARNING: This procedure requires measurement of
voltage. Do not cross test leads or allow
leads to touch other objects.
Back probe the module's output connections and verify the
correct output for the selected printer line voltage.
If the AC input is 115 VAC, the AC voltage between chassis
ground and Pins 1 and 2 should be approximately 115 VAC.
If the AC input is 230 VAC, the AC voltage between chassis
ground and Pins 2 and 3 should be approximately 63 VAC and
125 VAC from chassis ground to pins 1 and 4.
Are the proper voltages present?
11. Unplug printer. Reconnect J5 on Power Supply PCBA. Discon-
nect J17 on the Printer Controller PCBA. Plug printer in and
turn ON. Check for approximately+5 VDC between J17 pin 5
to chassis ground. Is this voltage present?
12. Unplug printer. Reconnect J17 on the Printer Controller PCBA.
Disconnect J2 on the Front Panel PCBA. Plug printer in and
turn it ON.
WARNING: This procedure requires measurement of
voltage. Do not cross test leads or allow
leads to touch other objects.
Check for approximately +5 VDC between J17 pin 5 to chassis
ground. Is this voltage present?
13. Unplug printer. Disconnect the two orange wires from the
bridge rectifier.
WARNING: This procedure requires measurement of
voltage. Do not cross test leads or allow
leads to touch other objects.
Plug in the printer and turn it ON. Check for approximately 45
VAC between the two wires. Is the voltage present?
14. Unplug printer. Reconnect the two orange wires. Disconnect
the red (J7) and black (J4) wires from the Power Supply
PCBA. Plug in the printer and turn it ON.
WARNING: This procedure requires measurement of voltage.
Do not cross test leads or allow leads to touch
other objects.
Check for approximately 24 VDC between the red and black
wires. Is this voltage present?
Troubleshooting
Result Corrective Action
YES Replace the transformer.
NO Replace AC filter module.
YES Go to Step 12.
NO Go to Step 13.
YES Replace Front Panel PCBA.
NO Replace Printer Controller
PCBA.
YES Go to Step 14.
NO Replace power transformer.
YES Replace the Power Supply
PCBA (see page 7–8).
NO Replace the rectifier.
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