TM  1-1520-240-10            3-2-27 p.  Push the (up arrow) or (right arrow) button until the desired receive level is displayed. q.  Push the INIT button. The N in RXPTV N will stop flashing. r.  Push the (up arrow) or (right arrow) button until the  Operating  Mode  is  displayed.  This  completes  the Receive Plaintext Volume adjustment. 3-2-33.  Standard Operation. These procedures describe normal transmit/receive op- eration for cipher text and plaintext voice messages. a.  Rotate the KY-100 PRESET switch to MAN (for manual selection) or the desired preset position. b.  For ciphertext operation: Place the MODE switch in CT. Ciphertext messages can now be transmitted or received. If the CT, CT ONLY menu is set for CT, plaintext messages can also be received. When transmitting in ciphertext,  the  TX  an  V  enunciators  will  be  lit.  When receiving a ciphertext message, the RX and V enuncia- tors will be lit. When receiving a plaintext message, the PT enunciator will be lit. c.  For plaintext operation: Place the MODE switch in PT. The CT, CT ONLY menu must be set for CT to be able to transmit or receive plaintext messages. When trans- mitting in plaintext, the TX enunciator will be lit. When receiving a plaintext message, the RX and PT enuncia- tors will be lit. 3-2-34.  Troubleshooting. Follow these procedures if the KY-100 displays a FAIL message during equipment configuration or operation. a.  Rotate the KY-100 PRESET switch to the PWR OFF position. b.  Place the MODE switch in the OFFLINE position. c.  Rotate the RESET switch to MAN. d.  If the KY-100 does not display a FAIL message after self test: Return to normal operation. e.  If the KY-100 does display a FAIL message after self test: Rotate the PRESET to the PWR OFF position. f.  Pull the MODE switch and rotate it to the Z ALL position. g.  Follow the COLD START Procedures. h.  If the KY-100 does not display a FAIL message after self test: Return to normal operation. i.  If the KY-100 does display a FAIL message after self test: Notify maintenance. 3-2-35. Off-Line Tests. The  off-line  TEST  menu  consist  of  automatic  (AUTO) tests, user-selectable (USER) tests and software version (VERSION) checking procedures. a.  Preliminary. (1) Set  the  KY-100  MODE  control  to  the  OF- FLINE position. (2) The display will indicate TEST which is the first OFFLINE menu. (3) Press  the  INIT  pushbutton  to  access  the TEST submenus. (4) Press the   (up arrow) or   (right arrow) pushbutton until the desired sub-menu option (AUTO or USER) is displayed. (5) Proceed to paragraph b, c or d as applica- ble. b.  Automatic (AUTO) Tests. (1) With AUTO displayed, press the INIT push- button to start the automatic tests. (2) At the conclusion of the automatic tests, the test results will be presented in the display. (3) If the automatic test are successful, PASS will be displayed and a pass tome will be heard. Next, the display will indicate USER which is the next sub-menu. To perform the USER tests, proceed to paragraph c. To exit, rotate the MODE control switch out of the OFFLINE position. (4) If a failure is detected during the automatic tests, a FAIL message will be displayed. c.  User Tests. (1) With USER displayed, press the INIT push- button to start the user tests. (2) PT LOOP will be momentarily displayed to indicate that a plaintext loopback test will be performed. Next, a PTT prompt is displayed. (3) Depress and hold the PTT switch and, with a TALK prompt displayed, speak into the microphone. Looped back plaintext voice will be heard in the handset receiver. (4) Release the PTT switch. (5) CT LOOP will be momentarily displayed in- dicating that the KY-100 is in the cipher text loopback mode. Next, a PTT operator prompt is displayed. (6) Press and hold PTT switch and, with a TALK prompt displayed, speak into the microphone until the TALK prompt disappears (approximately 15 seconds). (7) Release   the   PTT   switch.   The   LISTEN prompt is displayed. Listen to synthesized speech at the receiver. Upon completion of the speech loopback, ob- serve that PANEL is displayed.