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CUSTOMER/OPERATOR SERVICE
66
Manual 0-2470
To check the Log/Gate Drive/Display (LDD) PC board assembly,
measure for 15-18 VAC from J1-9 to J1-7 and from J1-9 to J1-6. If
15-18 VAC is not present, replace the LDD board.
Since the LDD board contains no high power circuitry, but does
contain all the controlling logic for the unit, many problems could
be caused by a faulty board. Never replace the LDD board to try
to fix a problem if there is any evidence of burning or arcing
anywhere in the unit. When disconnecting or connecting any of
the connectors from the board, support the board under the
connector to keep from putting too much stress on the board.
To replace the LDD board assembly:
1. Disconnect Jl, J2, J4, J5, and J16 from the LDD board, gently
folding back the harness and ribbon cables out of the way.
2. Remove the mounting screw near the middle of the board.
3. With a small screwdriver loosen the locking screw in the
current adjust knob and remove the knob.
4. Gently squeeze the top of the two rear plastic mounting
standoffs to release the board. Lift the rear end of the board
just enough to clear the locking tabs.
5. Squeeze the tops of the two front standoffs and lift the board
enough to clear the locking tabs. By lifting the rear of the
board, gently remove it, taking care not to get it caught on the
front panel holes for the switches or current control pot.
6. Install new board by tipping the front end of the board down
and putting the switches, LED and current control pot
through the front panel openings, and moving the board until
the two front mounting holes are over the standoffs.
7. Lower the board onto the four standoffs and screw in the
board mounting screw.
8. Reconnect J1, J2, J4, J5, and J16. The connectors all go in one
way only except Jl. Make sure J1 is connected so both ends of
the cable half of the connector line up with the ends of the
board mounted connector.
9. Turn the shaft of the pot all the way clockwise and reattach
the knob by tightening the screw with the line on the knob at
the straight down position.
Checking the
LDD Board
Replacing the
LDD Board
5.08 SERVICE PROCEDURES (continued)
Содержание CE CutMaster 50
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Страница 88: ...APPENDIX 84 Manual 0 2470 APPENDIX I SYSTEM SCHEMATIC A 00804 ...
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