Sony BCU-100 Maintenance Manual page 46

4) FAN Replacement
This is an item to be used when replacing the fan.
When the submenu diagnostic item "4. FAN Replacement" is selected, the following submenu opens.
*Hm: Hours Meter
FAN_x Reset
Resets (zero clear) the fan operation time (Hours Meter) stored in the EEPROM in the unit. After the
fan is replaced, reset the fan by selecting the corresponding fan number. The fan number can be
checked by opening the top panel of the unit (a number is assigned to each duct). Select "Error Log
Tool" > "Read Error Log" to check if the error code of the fan is retained. If it is retained, perform
the following operations in the displayed order.
1. Identify the defective fan by referring to the error code list.
2. Replace the defective fan.
3. Reset (zero clear) the Hours Meter of the replaced fan.
4. Execute "Basic Check" > "FAN Check" to check the fan revolution speed.
The following dialog may appear while executing "FAN_x Reset". This is displayed only when the
replaced fan number does not match the error log. If this is known, click "Yes".
When "No" is clicked, this item ends without resetting.
All FAN Reset (incl. the above Reset 1-5)
This mode executes items 1 through 5 for all fans. Execute this when all the fans are replaced such as
for periodical replacement.
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BCU-100 MM