Servicing The Bc Controller - Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook

[ IX Troubleshooting ]

[8] Servicing the BC controller

(1) Service panel
Work procedure
1. Remove 2 lock nuts on the control box, loosen 2 lock nuts,
and remove the control box.
2. Remove 4 fixing screws on the service panel, and remove
the service panel.
3. Remove 9 machine screws on the ceiling panel, and re-
move the ceiling panel.
(2) Control box
Work procedure
1. To check the inside of the control box, remove 2 lock nuts
on the control box cover.
(1) Check the terminal connection of the power wire or of the
transmission line.
(2) Check the transformer.
(3) Check the address switch.
2. When the control board is replaced, the followings must
be noted.
(1) Check that the board type is NU-G,NU-GA, or NU-GB.
(2) Check that the wire or the connector is not incorrectly
connected, not disconnected or not loose.
Note:
It is not required to remove 2 fixing screws on the con-
trol box when checking the inside.
*Special care must be taken when replacing heavy parts.
Explanatory figure
Loose
Control Box
Explanatory figure
CMB-1016NU-G, 1016NU-GA
- 354 -
Ceiling panel
Service panel