# RTU seems OK, but will neither answer, nor dial out on phone line

- This assumes that you hear a voice report at the Front Panel when you press CHECK STATUS.
- With the normal light lit, test the phone line by pressing DIAL-OUT. The PHONING light should light and you should hear a dial tone.
- If you do not hear a dial tone, open the door of the RTU and verify that fuses F1 and F2 (800 milliamperes) are not blown.
- Check the phone line and its connection with a DC voltmeter and/or a separate telephone handset.
- A live phone line should deliver approximately 50 VDC when the product is on hook. This voltage will drop to just a few volts when the product or other connected phone device goes off hook. Failure of this voltage to so drop when the RTU goes off hook indicates a likely blown fuse F1 or F2. The replacement is Bussman BK/GMC 800 ma or equivalent.
- If you do hear the dial tone after pressing DIALOUT, press the digits of a valid phone number. You should hear the clicks of relay (for pulse dialing) or else the tones of tone dialing, as you press each digit. The dial tone should cease after you enter the first digit. Continue until you have dialed the complete phone number. You should now hear the sound of ringing and someone answering at the other end.
- End the call by pressing NORMAL.