Kenwood NXR-901 Service Manual page 31

Control unit (X53-4140-10)
Serial data enable signal to potentiometer of OCXO unit
Pin No. Name I/O
CN300 (To X55-312 CN43)
RX_IF_VN I 2nd IF signal (450 kHz) of NXDN mode
CN302 (To X56-315 A/3 CN405)
REF2 20.0MHz reference clock input from TX
I
(20.0MHz) unit
CN400 (To X56-315 A/3 CN805)
1 GND - Ground
2 GND - Ground
Control signal for reference clock
3 REF_SW2 O
change circuit
4 WP O Write protection signal to EEPROM
Control signal for reference clock
5 REF_SW O
change circuit
ADC of OCXO unit (for electric current
6 OX_SCL O
detection) to serial clock
7 EXT_EXIST I External reference clock detection signal
ADC of OCXO unit (for electric current
8 OX_SDA I/O
detection) to serial data input/output
9 REF_EXIST I Reference clock detection signal
10 IMP_H_L - No connection
Control signal for reference clock
11 REF_IN_OUT O
change circuit
12 GND - Ground
Serial data input from potentiometer of
13 OX_SDI2 I
OCXO unit
14 GND - Ground
OCXO_VR_ Serial data enable signal to potentiom-
15 O
EN eter of OCXO unit
16 GND - Ground
17 OCXO_ON O Power source control of OCXO unit
18 GND - Ground
OCXO_ Monitor of the voltage which detects
19 I
CURR current of OCXO unit
20 GND - Ground
21 OCXO_EXIST I Detection signal of OCXO unit presence
22 GND - Ground
VCXO_DA_ DDS (5.99MHz) to serial data enabling
23 O
EN signal
24 GND - Ground
25 REF_LDT I Lock detection signal from PLL (20.0MHz)
26 GND - Ground
27 PLL_19_EN O Serial data enableing signal to PLL (20.0MHz)
28 GND - Ground
29 PLL_19_CE - No connection
30 GND - Ground
31 OX_SDO2 O DAC of OCXO unit to serial data output
TERMINAL FUNCTION
Function
Pin No. Name I/O
32 GND - Ground
33 OX_SCLK2 O DAC of OCXO unit to serial clock output
34 33MPU O 3.3V constant voltage
35 GND - Ground
36 GND - Ground
CN401 (To X53-413 CN1)
1 GND - Ground
2 GND - Ground
3 RX_POWER_SAVE O Power saving signal of RX unit
4 OCXO_ST_R O OCXO LED red control
5 OCXO_ST_G O OCXO LED green control
6 VOLUME_IN I Voltage monitor for audio level control
7 PWR_ST_R O POWER LED red control
Transmission modulating signal of
8 MOD_D_OUT O
NXDN mode
9 GND - Ground
Reception demodulating signal of
10 RX_AUDIO_D O
NXDN mode
11 BEEP O Beep sound signal output
Audio signal before the transmission
12 MIC_D_IN I
compressing of the NXDN mode
13 INRA_SW - No connection
14 NC - No connection
15 HOOK_RXD_SCM I Hook detection input
Power source control of audio power
16 AMP_SW O
amplifi er
17 SCM_EN - No connection
18 AF_MUTE O Audio mute control
19 INSP_SW - No connection
Serial data to DAC
20 EVOL_DATA O
(for audio level adjustment)
21 PTT_AM16C I "Press-to-talk-switch" signal to Main MPU
Serial clock to DAC
22 EVOL_CLK O
(for audio level adjustment)
23 GND - Ground
Serial load to DAC
24 EVOL_LD O
(for audio level adjustment)
25 TAAD_SW O Route formation signal of audio circuit
26 TA_SW O Route formation signal of audio circuit
27 BEEP_SW O Route formation signal of audio circuit
28 PATH_SW O Route formation signal of audio circuit
29 RXAD_SW O Route formation signal of audio circuit
30 MIC_SW O Route formation signal of audio circuit
31 MICAD_SW O Route formation signal of audio circuit
32 TD_SW O Route formation signal of audio circuit
33 NC - No connection
34 LO_VOL_DET I Detection of voltage for low voltage state
NXR-901
Function
31