Nautel NV5, Troubleshooting Manual

Page: 15 / 228

NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-7
Table 1.1: Troubleshooting Alarms
Alarm (with Prefix) Description and Troubleshooting Action
Controller: +12V
Supply A (or B) Fault This alarm occurs if the +12 V supply from SBC/AUI power supply A
(U1) or B (U2) is outside its acceptable voltage range (b10.8
and +13.2 V). Use a digital multimeter to measure between
+V
and
-V
of the s12 V supply’s output voltage. If necessary, replace the
+12 V supply (see
“+12 V Power Supply Replacement” on page 1-
42 ). If the alarm persists after replacing the supply, suspect the
control/interface PWB (A1).
Controller: +15V
Supply A (or B) Fault This alarm occurs if the +15 V supply from LVPS module A (U3) or B
(U4) is outside its acceptable voltage range (b13.5 and
+16.5 V). Use a digital multimeter to measure between
V2
and
COM
of the suspect LVPS output voltage. If necessary, replace the LVPS
(see
“LVPS Replacement” on page 1-40 ). If the alarm persists after
replacing the supply, suspect the control/interface PWB (A1).
Controller: -15V
Supply A (or B) Fault This alarm occurs if the +15 V supply from LVPS module A (U3) or B
(U4) is outside its acceptable voltage range (between -13.5 and
-16.5 V). Use a digital multimeter to measure between
V3
and
COM
of
the suspect LVPS output voltage. If necessary, replace the LVPS (see
“LVPS Replacement” on page 1-40 ). If the alarm persists after
replacing the supply, suspect the control/interface PWB (A1).
Controller: +5V
Supply A (or B) Fault This alarm occurs if the +5 V supply from LVPS module A (U3) or B
(U4) is outside its acceptable voltage range (b4.95 and
+6.05 V). Use a digital multimeter to measure between
V1
and
COM
of
the suspect LVPS output voltage. If necessary, replace the LVPS (see
“LVPS Replacement” on page 1-40 ). If the alarm persists after
replacing the supply, suspect the control/interface PWB (A1).
Controller: Active
Exciter Fail This alarm occurs when a system inhibiting fault has occurred within
the active exciter. The transmitter will be latched off (or changeover to
the standby exciter, if applicable). Check for associated Exciter
prefixed alarm(s) that may have caused the failure and refer to their
troubleshooting action.
Controller: Active
Exciter Not
Responding This alarm occurs if the active exciter is not responding to serial
messages. Check the integrity of the cable between the exciter’s
TX
LINK
connector and J5 or J6 (as applicable) of the control/interface
PWB. If the connection is secure, the problem is likely exciter related.
Check for associated Exciter prefixed alarm(s) that may have caused
the failure and refer to their troubleshooting action.