Guardian Technologies SCR 11 ユーザーズマニュアル

 

Page 7 

 

 

 

Field repairs may only be carried out by qualified technicians using OEM parts.  
Substitution of parts voids warranty and may pose a hazard to users of the 
equipment. 

•  Disconnect the telephone from Tip and Ring power supplied by the PABX 

or central office before attempting to make repairs. 

•  Carefully remove the front cover assembly and separate from the housing 

by disconnecting the harness plugs.  NOTE that the electronics are 
attached to the front plate.

 

•  Perform the necessary repairs or adjustments. 

•  Carefully replace the front plate and install all eight screws.  Do not over 

tighten the cover screws, there is a flexible gasket between the cover and 
the body.  Excessive tightening of the screws deforms the gasket and 
reduces the weather resistance of the set. 

•  Remove the old fuse by pushing in the end cap of the fuse holder and 

turning counterclockwise to open.  Insert a new 0.25 amp, 250Volt, 3AG 
fast blow fuse and close the fuse holder. 

WARNING! 

•  Replace only with a 0.25 amp 250V 3AG fast blow fuse. Failure to do so 

will void the warranty. 

•  If, on reconnecting power, the fuse fails, check the telephone system 

wiring. The fuse protects the Tip and Ring line from the telephone system. 
It is usually powered at 48 volts DC and must not be connected to 120 volts 
AC.