Requirements When Replacing Service Board Of Indoor Unit; How To Replacement Of Service Indoor P.c. Board - Toshiba RAV-SM562KRT-E Service Manual

9. HOW TO REPLACE SERVICE BOARD OF INDOOR UNIT

Requirements When Replacing Service Board of Indoor Unit

The non-volatile EEPROM (IC10) on the board of indoor unit stores important data such as model-specific type and capacity
code (written during factory shipping) as well as system/indoor unit/group addresses set automatically/manually (written during
installation). Therefore, observe the following procedure when replacing indoor unit service boards.
After installation of indoor unit, check whether the settings are correct by checking indoor unit number and group header/
follower unit setting, and also check cycle through a trial operation.
[Replacement Procedures]
Case 1
When it is possible to power ON indoor unit before replacement and when wired R/C can read settings
Power ON reset (for all indoor units connected to R/C in group control mode)
Case 2
When it is impossible to power ON indoor unit before replacement or when wired R/C is disabled
due to failure of power supply circuit (board failure)
Replacing EEPROM (For layout of components and replacement, see page 49.)
Remove the EEPROM on the board, and replace it with the EEPROM on the service board.
Replacing EEPROM (For layout of components and replacement, see page 49.)
Replace EEPROM again. (Mount the original EEPROM on the service board.)
Power ON reset (for all indoor units connected to R/C in group control mode)
Case 3
When the EEPROM before replacement is defective, and the settings cannot be read
Writing Setting Data in EEPROM (using customer information) *3 (see page 52)
Power ON reset (for all indoor units connected to R/C in group control mode)
Reading EEPROM Data *1 (see page 51)
Replacing Service Board and Power ON *2 (see page 51)
Writing Setting Data in EEPROM *3 (see page 52)
Replacing Service Board and Power ON *2 (see page 51)
Reading EEPROM Data *1 (see page 51)
If data cannot be read, go to Case 3.
Replacing Service Board and Power ON *2 (see page 51)
Writing Setting Data in EEPROM *3 (see page 52)
Replacing Service Board and Power ON *2 (see page 51)
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