Control Pcb - Mitsubishi Electric MELDAS C6 Maintenance Manual

4. DAILY MAINTENANCE AND PERIODIC INSPECTION AND MAINTENANCE

4.3.4 Control PCB

(1) Main card
Always turn the control unit power OFF before replacing the main card.
(1) Confirm that the control unit power is OFF. (If the power is not OFF, turn it OFF.)
(2) Disconnect all cables connected to the control unit's connectors.
(3) Remove all cards mounted in the control unit's extension slots.
(4) Press the latches at the top and bottom of the control unit's front panel, and pull the front
panel with the main card.
Hold the front panel section with a hand, and take care not to touch the PCB.
Take care hereafter, as if the main card is contacted against metal sections, the data backed
up in the memory will be damaged.
(5) Replace with the new card. Align the main card with the rails on the control unit frame, and
press in until the latches lock.
(6) Mount the cards in the control unit's extension slots.
(7) Correctly connect all cables that were connected.
Main card
Latch
Front panel
Latch
CAUTION
Incorrect connections could cause device damage, so always connect the cables to the
designated connectors.
Do not replace the control section power PCB while the power is ON.
Do not connect or disconnect the cables connected between each unit while the power
is ON.
4.3 Replacement Methods
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Control unit
frame