Kenwood NXR-901 Service Manual page 35

Pin No. Name I/O
Enable input for OCXO IC3 (potentiom-
22 OCXO_VR_EN I
eter)
23 GND - Ground
Serial data output for OCXO IC3 (po-
24 OX_SDI2 O
tentiometer)
25 GND - Ground
26 REF_IN_OUT I Reference clock switched signal input
27 IMP_H_L I 100kohm load
28 REF_EXIST O Reference detector signal output
29 OX_SDA I/O OCXO EEPROM serial data
30 EXT_EXIST O External reference detector signal output
31 OX_SCL I OCXO EEPROM serial clock
32 REF_SW I Reference signal output switch
33 WP I EEPROM write protect signal input
34 REF_SW2 I OCXO reference signal output switch
35 GND - Ground
36 GND - Ground
CN806 (To X45-387 A/4 CN20)
1 GND - Ground
2 GND - Ground
3 WP O EEPROM write protect signal output
4 GND - Ground
5 D_GND - Digital ground
6 SDA I/O EEPROM data
7 D_GND - Digital ground
8 SCK O EEPROM clock
9 D_GND - Digital ground
10 CONT_5.0V O Switched 5V power supply
11 D_GND - Digital ground
12 TEMP_PRT I Temperature protection signal input
13 GND - Ground
14 ANT_SW O TX antenna switch output
15 GND - Ground
16 TEMP_RST O Temperature sensor reset signal output
17 GND - Ground
18 FAN_CONT2 O FAN2 control signal output
19 GND - Ground
20 FAN_CONT O FAN1 control signal output
21 GND - Ground
22 PWR_CONT O Power control signal output
23 GND - Ground
24 PA_BIAS O PA Vbias terminal control
25 GND - Ground
26 RFL_PWR I Refl ect power signal input
27 GND - Ground
TERMINAL FUNCTION
Function
Pin No. Name I/O
28 FWD_PWR I Forward power signal input
29 GND - Ground
30 FAN_CURR I FAN current monitor signal input
31 GND - Ground
32 PA_CURR I PA current monitor signal input
33 GND - Ground
34 NC - No connection
35 GND - Ground
36 GND - Ground
CN807 (To X42-328 CN3: OCXO Optional unit)
1 8OCXO O OCXO power supply 8V
2 GND - Ground
TX unit (X56-3150-11) (B/3)
Pin No. Name I/O
CN920 (To X56-315 C/3 CN960)
1 DC8 O 8V Power supply
2 GND - Ground
3 50MPU O Switched 5V power supply
4 STB O Shift Register Strobe
5 SR_OE O Shift Register Output Enable
6 SR_CLK O Shift Register Clock
7 SR_DATA O Shift Register Data
8 LED1 O D960 segment "F" control
9 GND - Ground
10 LED10 O D961 segment "F" control
CN921 (To X53-413 CN3)
1 MIG - MIC Ground
2 GND - Ground
3 MIC O MIC Signal Input
4 33MPU I Switched 3.3V power supply
5 33AUD I Switched 3.3V power supply
6 VOLUME_IN O Volume control output for AF signal
7 SB I Power supply output
8 OCXO_ST_R I OCXO Red LED Switch
9 PWR_ST_R I POWER Red LED Switch
10 OCXO_ST_G I OCXO Green LED Switch
11 GND - Ground
12 HOOK_RXD_SCM O HOOK detect signal
13 SCM_EN - No connection
14 PTT_TXD_SCM O MIC PTT
15 GND - Ground
16 SR_OE I Shift Register Output Enable
17 GND - Ground
NXR-901
Function
Function
35