iSys V12 Thermal Printer - Manual (Page 36)

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Replacing the 24 Volt power supply
1. Remove right side panel as described in this chapter.
2. Open the back panel as described in this chapter. Disconnect all cables attached to the main
logic board.
3. Remove the six bottom panel screws shown in Figure 7-4.
4. Detach the fork connectors of the bottom fan cable from the 24Volt power supply terminal
block shown in Figure 7-27. Remove the ground connection on the bottom panel. Remove the
bottom panel assembly.
5. Remove data ribbon cable from the back of the 24 Volt supply.
6. Remove the four 24 Volt power supply bracket mounting screws located in the media area of
the plotter- Figure 7-29.
7. While still in the chassis, loosen the AC terminal screws on the 24 Volt supply- Figure 7-30.
Remove the AC connections from the power supply terminal block.
8. Remove the two nuts off the power studs on the 24 Volt power supply. Use a 3/8” hex socket
driver to access these through the right side of the chassis. See Figure 7-31.
NOTE: Note the cable placements for reinstallation. If cables are installed incorrectly, damage
to the circuitry will occur.
1. Remove the 24 Volt power supply from the chassis.
2. Remove the four power supply mounting bracket screws shown in Figure 7-32. Retain for
reinstallation.
3. Replace the 24 Volt power supply and reverse steps to reassemble.
Replacing the main board
1. Open the back panel as described in this chapter.
2. Disconnect all cables from their headers on the main logic board by grasping at the
connectors and pulling straight upwards making note of their position.
3. Remove the five 4-40 x 1/4” main board mounting screws shown in Figure 7-23. Remove the
main board.
4. Replace the main board and reverse steps to reassemble. Make sure the interface jumper is
in the correct position and that all cables are properly reconnected.
Replacing the capacitor
1. Open the bottom panel as described in this chapter.
2. Remove the two capacitor cable screws shown in Figure 7-22. Remove the cables.
3. Loosen the capacitor clamp bolt shown in Figure 7-22.
4. Replace the capacitor and reverse steps to reassemble.
CAUTION: Note the polarity of the cables. Yellow wires should be connected to the positive (+)
terminal of the capacitor, black wires should be connected to the negative (-) terminal of the
capacitor.