Lexicon MPX 110, Service Manual

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Lexicon
5-17
Disassembly/Reassembly
DISASSEMBY
1. Remove six-(6) screws from the housing: three-(3) from the top, and three-(3) from the bottom.
2. Carefully remove the two end caps, swinging them out by the rack ears.
3. Remove five-(5) plastic nuts from the jacks on the rear panel.
4. Remove the two-(2) small Phillips head screws at the rear panel MIDI jacks.
5. Holding the front panel, carefully remove the cover.
6. To disconnect the circuit board from the front panel:
6.1. Pull off the seven-(7) knobs on the front panel
6.2. Remove the seven-(7) nuts and washers from the front panel.
6.3. Hold the unit face down, and carefully separate the circuit board assembly from the front panel.
6.4. Carefully remove the buttons from the rear of the front panel.
NOTE: The buttons are loose and can fall out.
REASSEMBLY
1. Holding the front panel face down, reinsert the buttons. Continue to hold the front panel face down so
as not to loosen the buttons.
2. From the rear, carefully position the circuit board and insert it into the front panel.
3. Replace the nut and washer on one potentiometer at each end and hand tighten.
4. Replace the remaining potentiometer nuts and washers. Check for alignment, then tighten all nuts. Do
not overtighten.
5. Replace the cover, being careful to align the jacks and power connector with the holes in the rear of the
cover.
6. Replace the seven-(7) plastic nuts on the jacks. Be careful not to overtighten.
7. Replace the seven-(7) knobs on the front panel.
8. Replace the two-(2) screws at the rear panel MIDI jacks.
9. Insert the two end caps by hooking the rear tab of each into each end of the cover.
10. Holding the end caps in place, install the six-(6) screws.
11. Tighten the rear-panel screws next to the power connector.
REMOVAL AND INSTALLATION OF COMPONENTS
From time to time, it may be necessary to replace pots, jacks or other components. When desoldering, be
careful not to overheat the board. Use all caution to prevent damage to the circuit board, traces and pads.
When installing pots, jacks or displays, make sure that they are mechanically flush with the circuit board
prior to soldering in place. If not properly aligned, stress can be placed on the new components and the
board, resulting in early failure of the board and/or component.