JRC JSS-296 -, Service Manual

Page: 96 / 220

6.4.1 Descriptions
The PA unit consists the PA control unit, the PA unit(s), the main control unit, and the PS unit.
NAH-296 has one PA unit. NAH-695 has two PA units. NAH-698 has three PA units. The PA
control sprits the RF IN signal for each PA unit and combine the output from each unit when AC
operation. At DC operation and tuning the PA control pass the RF IN through to RF OUT directly.
The PS unit makes the +24V for battery charging and +BK, +80V for PA, +13.6V for transceiver
unit, modem unit, DTE and printer.
The PA unit makes the RBK signal from –BK signal. The RBK signal keeps low level 3 minutes
more after –BK signal changes to high.
6.4.2 Signals from/to the other units
From/
To
Connecter
Name
Pin
No.
Console
Terminal
Signal
Name
Description
PA IN PA IN RF IN Input for power amplifier.
1 85 TXD Transmission data to the Transceiver.
2 86 GND Signal ground.
3 87 -BK Key signal from the Transceiver.
4 88 Analog Antenna current analog data.
5 89 -PA mute Prohibit the transmission of the Transceiver.
TRX
JSB-
196GM
Tuner
JSB-
196GM
6 90 RXD Received data from the Transceiver.
PA OUT PA OUT RF OUT Power amplifier output.
1 55 +13.6V
2 56 +13.6V
+13.6V power source for tuner.
3 57 GND
4 58 GND
DC power return. Signal ground.
5 59 TXD Transmission serial data.
6 60 RXD Receive serial data.
7 61 -PA MUTE Transmission is prohibited when low.
Tuner
8 62 ANT CURR Antenna current analog data.
Tuner
NFC-
296/
896
Accessory 4 6 RBK Set the tuner ready to transmit when low.
12 1 +BK +BK (+24V DC)
6 2 -BK -BK
11 3 +BK +BK (+24V DC)
5 4 -BK -BK
10 5 +BK +BK (+24V DC)
9 7 GND Signal ground.
3 8 -TX INH Transmission is prohibited when low.
2 9 -CHG ALM Low when battery charging is abnormal.
8 10 DC OUT Low when DC operation.
1 64 -SES/HF SES DC operation remote control output.
Other Accessory
7 65 -SES OUT SES DC operation status output.
12 74 +24V
GPS 1 AUX P/S
4 75 GND
DC power source for No.1 GPS.
(Maximum current 3A)
11 76 +24V
GPS 2 AUX P/S
3 77 GND
DC power source for No.2 GPS.
(Maximum current 3A)
14 47 +24V
VHF 1 AUX P/S
6 48 GND
DC power source for No.1 VHF.
(Maximum current 5A)
13 49 +24V
VHF 2 AUX P/S
5 50 GND
DC power source for No.2 VHF.
(Maximum current 5A)
15,
16
78 +24V
INM-C AUX P/S
7, 8 79 GND
DC power source for INMARSAT-C.
(Maximum current 15A)
10 80 +24V GPS
Buffer
AUX P/S
2 81 GND
DC power source for GPS buffer NQD-3030.
(Maximum current 1A)
9 82 +24V EMG.
LIGHT
AUX P/S
1 83 GND
DC power source for emergency light.
(Maximum current 1A)
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