Circuit description, Resetting the gps unit, Gps operation check method after repairs – Kenwood KMC-47GPS User Manual
Page 3: Terminal function, Kmc-47gps/48gps, Circuit description terminal function
KMC-47GPS/48GPS
RESETTING THE GPS UNIT
GPS OPERATION CHECK METHOD AFTER REPAIRS
When the KMC-47GPS/48GPS cannot determine the
position in a situation where GPS data is received, use the
following procedure to reset the GPS unit.
Reset the GPS unit by removing the internal battery and
then re-installing it. (To remove the internal battery, refer to
“HOW TO REPLACE THE INTERNAL BATTERY”.)
Check the GPS operation according to the following pro-
cedures.
1. Prepare the transceiver which incorporate the GPS func-
tion. (Set the GPS Position Display to a key, such as the
[S] key, with the FPU beforehand.)
2. Connect the KMC-47GPS/48GPS to the connector (uni-
versal or 2-pin) on the transceiver.
3. Turn the transceiver power ON.
4. Go outside, then press the [S] key (the key that you previ-
ously set as the GPS Position Display) on the transceiver.
5. The “GPS” and latitude information are displayed on the
LCD of a transceiver.
The location data is calculated by the GPS unit and is
then sent to the transceiver via the RXD terminal of the con-
nector (universal or 2-pin).
When the transceiver is turned OFF, the GPS unit enters
to backup mode and the power is supplied by the internal
rechargeable lithium battery.
When the transceiver is turned ON, the GPS unit enters
to normal operation mode and the power is supplied from
the transceiver via the 5M terminal of the connector (universal
or 2-pin). While the transceiver is turned ON, the internal re-
chargeable lithium battery charges.
It takes approximately 40 seconds to calculate the location
data when the GPS unit is “cold started” (full initialization).
CIRCUIT DESCRIPTION
TERMINAL FUNCTION
Universal connector (KMC-47GPS)
Pin No.
Name
I/O
Function
1
SSW
O
External speaker switch
2
SP+
I
Speaker input (BTL + side)
3
SP-
I
Speaker input (BTL – side)
4
MSW
O
External MIC switch
5
EMC
O
MIC output
6
ME
-
MIC GND
7
PTT
O
PTT output
8
PF
-
No connection
9
NC
-
No connection
10
E
-
GND
11
5M
I
Input from the power with DC 5V
12
TXD
-
No connection
13
RXD
O
GPS data output
14
E
-
No connection
-pin connector (KMC-48GPS)
Pin No.
Name
I/O
Function
1
SP
I
Input from AF AMP
2
AE
-
GND
3
5M
I
5V DC input
4
MIC
O
Microphone output
5
PTT/RXD
O
PTT output/GPS data output
Note:
・The KMC-47GPS/48GPS has an internal battery to back-
up the built-in pinpointing data. When the internal battery is
charged, the transceiver will retain the pinpointing data (the
last positional information) for approximately 20 days. (When
used for the first time, it takes approximately 10 hours to fully
charge the internal battery.)
・When the internal battery is in the discharged state, pin-
pointing data returns to its initial value. When the positional
information is at its initial value while turning on the trans-
ceiver, the life cycle of the internal battery is considered.
1
2
3
4
5
SP
AE
5M
MIC
PTT/RXD