Panasonic KX-FLB758RU Service Manual page 143

9. Check the toner sensor.......... "TONER LOW", "CHECK TONER"
Note:
As for the following check, remove the drum from the main body, set it again and close the cover, then perform that check
during initializing operation. Refer to SENSORS AND SWITCHES SECTION (P.185).
CROSS REFERENCE:
SENSORS AND SWITCHES SECTION (P.185)
10. Check the ADF cover open switch
11. Check the FB cover open switch
12. Check the CIS position sensor (ADF Home side)
13. Check the CIS position sensor (FB Home side)
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