18. Wire Rope Speed 



19 . Tape Counter 



20 . Record/Play Switch 



- shows speed of rope 

 through the head, 



- shows position on 

 cassette tape. 



- sets the electronic 

 control section and tape 

 transport in either re- 

 cord or play mode. 



21-25. Cassette Recorder Controls - ensure the 'Record' 



button is depressed 

 when initiating record- 

 ing. 



26. Cassette Tape Transport. 



27. External Battery Connection. 



28. External Battery Indicator:- will illuminate when 



the external battery 

 is connected with the 

 proper polarity. 



Prior to any testing the battery condition should be 

 checked. Depress the battery test switch and observe the 

 battery voltage on the IMA meter. The 'BATT' marking on 

 the meter corresponds to 11 .V. If the battery condition 

 is at or below this level the batteries should be re- 

 charged. If necessary the Electronic Control and Chart 

 Recording sections can be run from an AC source. This 

 is not recommended where the AC is electrically noisy. 



A-18 



