Low Voltage Power Supply Replacement - EDL Displays 6120 Operation And Maintenance Manual

LOW VOLTAGE POWER SUPPLY REPLACEMENT

P/N 6119-0106-03
Tools Required: 1. Screwdriver, common, straight slot.
REPLACEMENT PROCEDURE
1. Turn a.c. power OFF at front panel.
2. Disconnect the monitor a.c. power cord.
3. Unscrew the four captive screws on the Low Voltage Power Supply (LVPS).
4. Remove the Low Voltage Power Supply from its slot; At this time, inspect the
Power Supply Module connector for damage and check for blown fuses. Verify that
the 115V/230V switch is set correctly. If there are any blown fuses, replace with
proper fuse and proceed to step 5. If the required a.c. input voltage is 115
switch was set to the 230V a.c. position, set the switch to the required 115V
position and proceed to step 5. If the required voltage is 230V a.c. and the switch was
set to 115V a.c. with power applied, Do Not Retry the Supply. Fuses:
Fuse MDV-3 315003, F2-1A Buss Little Fuse GFA-1 251001.
NOTE: Low Voltage Power Supply voltages are set at the factory - Do Not Adjust or
attempt to adjust the voltage control pots. Check programmable dip-switch SW3 for
proper setting. For Rev K Firmware and above:
SW3-1 SW3-2 SW3-3 SW3-4
OFF
For Firmware revisions G1 and below the DIP switch setting is:
SW3-1 SW3-2 SW3-3 SW3-4
OFF
5. Carefully insert the Low Voltage Power Supply into its slot making sure the
connector is properly aligned with the Mother Board mating connector. Check the
following on the good supply before installing:
a. Good fuses in F1 & F2.
b. SW4 (115/230V a.c. switch) set for proper voltage (115V a.c.).
c. SW3 (B+/ext. control switch) set for multi-sync operation.
6. Tighten the four captive screws to seat the Low Voltage Power Supply.
7. Connect the a.c. power cord to the monitor.
8. Apply a.c. power and input signals and check the display for proper operation.
9. If a power supply has been re-tried after replacing a blown fuse or correcting a
switch setting and the fault is not corrected, follow the above procedure and replace
the Power Supply with a known good spare supply. If the fault still persists, submit the
monitor to shop maintenance for evaluation.
6115 - 6120 Operation and Maintenance Manual
ON OFF OFF
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a.c. and the
F1 -Buss Little
©EDL Displays, Inc. January 1997
the
a.c.