TM 1-1520-238-10 4-8 Change 9 DO NOT use RWND position unless the intent is to com- pletely rewind the tape because all elapsed counter refer- ences will no longer be valid. If an event mark is encoun- tered during playback the video recorder will automatically stop and freeze the image. To proceed past the event mark, either forward or backward, place the MODE switch in the STBY position then back to the PLAY position. The RCDR OFF / will be displayed for eight sec- onds in the sight status block of the CPG HAD and AND after the VID RCD pushbutton is activated to stop record- ing. 4.6 DATA ENTRY KEYBOARD (DEK). NOTE The DEK is functional on / air- craft. It is functional on aircraft as a backup to the CDU when the BBC is in control. The DEK placarded DATA ENTRY (fig 4-4), is located in the CPG left console (fig 2-12) and receives power from the No. 1 essential bus and No. 3 essential dc bus; protec- tion is provided by the FC AC and FC DC circuit breakers located on the pilot overhead circuit breaker panel. The DEK is continuously monitored by FD/LS; the on com- mand test (test 15-UTIL) will fault isolate to the LRU. Con- trol and functions are described in table 4-4. M01-084 Figure 4-4. Data Entry Keyboard Table 4-4. Data Entry Keyboard Control Functions Control Position Function DATA ENTRY OFF Deactivates the keyboard. STBY Power applied to keyboard and self test initiated, all inputs from the keyboard are ignored. RNG Input of CPG range, manual or automatic, in meters, aircraft to target. Automatic range calculations are commanded by the input of 0 range. Maximum manual range entry: 31,999. FD/LS Input to the fault detection/location system. CODE Input of standard NATO/Tri-Service laser code data. TGT Input of coordinate data for the waypoint/ targeting subsystem. SP1 (Spare Position 1) Input of data to the fire control computer. 4.6.1 DEK Operation. a. Key in a Letter: Press the shift key correspond- ing to the relative location of the desired letter. Then press the key with the desired letter. b. Key in a Number: Press the desired key. c. Enter Keyed-in Data: Press any shift key. Then press the ENTER/SPACE key.