NAVELEX EE 181-AA-OMI-120/E121 C-7359-60-1
Table 5-1. Troubleshooting Procedures - Continued
c. Set multimeter to dc volts and con-
nect positive meter lead to A4-TP7
(violet), and negative meter lead
to A4-TP3 (orange). Meter should
indicate 9 ±2 vdc. Maintain this
check for a period of time to en-
sure that voltage is stable.
Do NOT short A1-E14 to chassis/
ground or equipment will be damaged.
d. At the Data Transmitter, disconnect
jumper from A1-TP5 to chassis.
Connect jumper from A1-TP5 to
A1-E14. Change oscilloscope
settings as follows:
At Data Receiver, oscilloscope
should be connected to A4-TP6
and TP3. The oscilloscope should
display FSK signal as a sine wave
of 2 ±0.4 v and 0.91 to 0.96 ms
(1037.9 to 1102.1 Hz). Maintain
this check for a period of time to
ensure that FSK signal is stable.