Maintenance 
Cary 100/300/4000/5000/6000i/7000 Spectrophotometers User’s Guide  41 
Fuses 
The spectrophotometer contains two fuses, which are located at the 
back of the instrument. To replace a fuse, disconnect the 
spectrophotometer from the power supply, and replace the blown 
fuse with one of the type and rating as indicated in the Site 
Preparation Guide or on the rear of the instrument. 
NOTE 
For safety reasons, any other internal fuse or circuit breaker is not operator-
accessible, and should be replaced only by Agilent authorized personnel. 
 
Fuse information on the rear of the instrument is the most up-to-
date. 
 
WARNING 
 
 
 
Electrical Shock and Fire Hazards 
To prevent reduced safety protection or unwanted fusing, ALWAYS ensure 
that the code on the fuse cap matches the information printed next to the fuse 
holders. 
 
To check a fuse: 
1  Disconnect the instrument from the mains power supply. 
2  Undo the fuse cap by pressing the cap and turning it counter-
clockwise. 
3  Carefully pull out the cap. The fuse should be held in the fuse 
cap. 
4  Check that the fuse is the correct type and is not damaged. If 
necessary, replace the fuse. 
5  Place the fuse into the cap, push the cap in, and then turn the cap 
clockwise. 
6  Reconnect the instrument to the mains power supply.