- 11 - 



SERVICE 



BATTERY CHARGING 



1. Plug Battery Charger into wall outlet. Turn off instrument 

 Power Switch. 



2. Plug Charger Cord into "Battery Charge" connector of instru- 

 ment. 



3. Charge for approximately 14 hours. 



CAUTION: Charge Nickel-Cadmium batteries only! 



Other types of batteries may rupture causing severe 

 damage to instrument. 



BATTERY REPLACEMENT 



If battery recharging is not feasible, used batteries can be 

 replaced by charged Nickel-Cadmium batteries or by replaceable 

 batteries. 



1. Remove 9 screws from instrument lid. 



2. Lift off instrument lid. 



3. Remove old batteries from battery holders. 



4. Install new batteries (9V Rectangular replaceable or recharge- 

 able batteries) . 



5. Replace instrument lid. 



EXCHANGE OF GUIDE SHOES AND SENSE HEAD 



1. Loosen two brass srews on bottom of instrument. 



2. Remove sense head by gently pulling it in a foreward direction 



28 



