Heat Controller B-MMC12FA-1, B-MMH12FA-1, B-MMC09FA-1 manual When Vertical Louver does not operate

Troubleshooting Guide

Trouble 5 When Vertical Louver does not operate.

•Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor.

•If the regular torque is detected when rotating the Vertical Louver with hands Normal

•Check the connection condition of CN-UP/DOWN Connector

•Check the soldering condition(on PCB) of CN-UP/DOWN Connector

Check the operating circuit of the Vertical Louver

•Confirm that there is DC +12V between pin(RED) of CN-UP/DOWN and GND.

•Confirm that there is a soldering short at following terminals. - Between 60 , 61 , 62 and 63 of MICOM

- Between 2	, 3	, 4	and 5 of IC01M
- Between 12 , 13		, 14 , 15 of IC01M
- Between 1	, 2	, 3	, 4 and 5 of CN-UP/DOWN

If there are no problems after above checks

•Confirm if the assembly parts are catching and interfering in the rotation of the Vertical Louver

- 71 - Service Manual