29. TACHOGRAPH (TCO 15-6) 18. CUTTING KNIFE This knife cuts the tape connecting the charts. 19. INSTRUMENT LIGHTING LAMP 20. NAME PLATE This indicates the type and model. 21. VOLTAGE INDICATION LABEL 29.2 METHOD OF USING KEY There are three types of key. Key 1 with no mark is used for opening and locking the instrument. Key 2 (marked with No. 1) is change key 1 , and key 3 (marked with No. 2) is change key 2 . With these three keys, it is possible to know the details of the operation and the change of operator. To use the change key, remove the instrument lock key and insert change key 1 in the same key hole, then turn 45° in the No. 1 direction.
Use change key 2 in the same way and turn to the No. 2 direction The change key will only turn in the direction of its number. The change keys cannot be used to open the instrument. AE137670 Recording width of chart When using key with no mark: 1.45 mm (0.057 in) When using key with No. 1 mark: 2.15 mm (0.085 in) When using key with No. 2 mark: 0.7 mm (0.028 in) 5-18