Garmin GNC 420 Maintenance Manual page 167

B.8.3 J27
Pin # Pin Name
1 HEATER VIN
2 HEATER GND
B.9 GPS MODULE CONNECTORS
B.9.1 J101
Pin # Pin I/O
Name
TRAP 1 I
RSSI 2 O
BASEB 3 O
AND
GND 4 0
CLK32 5 O
GND 6 O
VCC 7 I
RSFW 8 I
B. 10 INTERFACE BOARD CONNECTORS
B.10.1 J19
See Data Card Flex description (J14).
B.10.2 J20
J20 is the Left Data Card Connector.
B.10.3 J21
J21 is the Right data Card Connector.
400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05
Table B-20. J27 Description
I/O
O Heater high. The heater typical resistance is 16 ohms.
I Heater low.
Table B-21. J101 Descriptions
0 to 12 V dc 4 Khz PWM output used to position the GPS notch.
Relative Signal Strength Indicator input used to position GPS notch via the
TRAP output. Input impedance: AC > 1 K ohm.
33 MHz clock.
Ground.
Logic high enables all power regulators.
DESCRIPTION
DESCRIPTION
Page B-17
Rev. C