Overhauling Procedures; Turn Off The Power; Control Parts; Remove Pcb A (If013) - Mitsubishi Electric GUG-01SL-E Handbook

8. Overhauling procedures

Work precautions
• When touching the electric components such as circuit boards, do not touch the components for more than
five minutes after power-off, and then start working. When shut down the power of the Dx-coil unit for repair
working, make sure to turn off the power to the Lossnay unit as well.
• Terminals of a large electrolytic capacitor in the power circuit section continues to generate low-voltage for
approximately one hour after the power shutdown. Therefore, handle the circuit board very carefully when
replacing it.
• Before replacing parts, repair troubled sections according to the instructions described in the troubleshooting.
• When servicing, always keep proper footing.
• When servicing, the power supply isolator must be turned off. Pay sufficient attention to avoid electrical
shock or injury.
• Always connect the power wire properly.
• After completing repairs, check that the unit operates properly.
• Always wear gloves when servicing.
The part names in the texts are standardized with the part names in the parts catalog. (There are some exceptions.)

( 1 ) Turn off the power

1 Shut down the system.
2 Turn off the power supply isolator on the distribution board.

Control parts

Before servicing, make sure all LEDs on the circuit boards of the Dx-coil unit and Lossnay unit are unlit.
Note
Record the setting status of the function selection switches on the circuit boards (PCB A and PCB B of the Dx-
coil unit, and control circuit board of the Lossnay unit) using the check sheet on the pages 45 and 46.
If Lossnay remote controller (PZ-61DR-E) is connected, also record its setting status.

( 2 ) Remove PCB A (IF013)

1 Unscrew the black screws (four special screws 4×8,
indicated by  and shown in the photo below) to remove
the control cover.
2 Disconnect all lead wire connectors from PCB A and
PCB B.
3 Disconnect all lead wires from the terminal block.
(Black)
─ 35 ─
Control cover
Terminal block
PCB A (IF013) PCB B (GU-01-E)