400 SERIES MAINTENANCE MANUAL
Page 3-5
P/N 190-00140-05
Rev. C
The values listed in Table 3-1 are with the display backlight at maximum brightness.
Table 3-1. Unit Board Power Supply Max Current Allowed
Unit (Main Board)
Unit
Status
Max Current (A)
@ 27.5 V
Max Current (A)
@ 13.8 V (Optional)
GPS 400
ON
0.66
1.32
GNC 420
ON
RX—0.99
TX—3.36
RX—1.98
TX—7.32
GNS 430
ON
RX—1.17
TX—3.98
RX—2.34
TX—7.96
ALL UNITS
OFF
0.014
0.011
16 Watt Units
Unit Status Max Current (A)
@ 27.5 V
GNC 420A
ON
RX—0.99
TX—3.36
GNS 430A
ON
RX—1.17
TX—3.98
3.3.2.2
Com Board
Replace the Main Board if any voltage on the Com Board is not within tolerance. Replace the
Com Board if excessive current is measured.
Table 3-2. Com Board Power Supply Tolerances
Connector/Pin
Voltage (V)
Tolerance (V)
Max
Current
Conditions/Remarks
J26 Pin 5
+5
4.9 to 5.3
90 mA
J26 Pin 1
+12
11.5 to 13
420 mA
TX Mode
J26 Pin 2
-12
-16 to -11
35 mA
Receive Mode
J2 Pin 11 & 12
+11 to +33
15 mA
Receive Mode
J2 Pin 11 & 12
+13.75
(14/28V 10 Watt
Units Only)
r
.2
6.0 A DC
1
TX Mode
J2 Pin 11 & 12
+27.5 (28V 10
Watt Units Only)
r
.4
3.0 A DC
1
TX Mode
J2 Pin 11 & 12
+27.5 (16 Watt
Units Only)
r
.4
3.0 A DC
1
TX Mode
1
Modulated transmitter operating into a 50 ohm load.
