Kenwood NXR-901 Service Manual page 34

NXR-901
Pin No. Name I/O
CN407 (To X42-328 CN2: OCXO Optional unit)
1 OCXO I
1 REF_IN (10MHz) I
CN801 (To X45-387 C/4 CN12)
1 E -
2 B I
3 B I
CN802 (To X45-387 A/4 CN1)
1 TX OUT O TX driver output signal (coaxial)
CN803 (To X42-328 CN1: OCXO Optional unit)
1 33MPU O Switched 3.3V power supply
2 GND -
3 OX_SDA I/O OCXO EEPROM serial data
4 OX_SCL O OCXO EEPROM serial clock
5 OCXO_VR_EN O
6 OCXO_ON O OCXO power on signal
7 OX_SCLK2 O
8 OCXO_CURR I
9 OX_SDI2 I
10 OCXO_EXIST I
11 OX_SDO2 O
12 GND -
13 REF_SW2 O OCXO reference signal output switch
CN804 (To X53-413 CN56)
1 GND -
2 GND -
3 WP I
4 MOD I
5 GND -
6 SDO1 I
7 SCLK0 I
8 SCLK1 I
9 SDO0 I
10 SDI1 O Serial data output for IC703
11 SR_EN I
12 8AD_EN I
13 SR_OE I
14 2DA_CE I
34
TERMINAL FUNCTION
Function
OCXO (Optional unit) reference signal
input (coaxial)
CN408
External reference signal input (coaxial)
Ground
Power supply (Vcc)
Power supply (Vcc)
Ground
Enable output for OCXO IC3 (potenti-
ometer)
Serial clock output for OCXO IC3 (po-
tentiometer)
OCXO current detection signal
Serial data input for OCXO IC3 (poten-
tiometer)
OCXO detection signal
Serial data output for OCXO IC3 (po-
tentiometer)
Ground
Ground
Ground
EEPROM write protect signal input
Modulation signal input
Ground
Serial data input for IC114(IC5), IC204,
IC703, IC705
Serial clock input for IC711(IC201,
IC207, IC701)
Serial clock input for IC2(IC5), IC204,
IC703, IC705
Serial data input for IC711(IC201,
IC207, IC701)
Enable input for IC701
Enable input for IC703
Enable input for IC701
Chip enable input for IC705
Pin No. Name I/O
15 3DA_EN I Enable input for IC201
16 2DA_EN I Enable input for IC705
17 LDT O RF PLL lock detect output
18 132_CE I Chip enable input for IC204
19 440_CE I No connection
20 132_EN I Load enable input for IC204
21 440_EN I Load enable input for IC1(IC5)
22 VR_EN I Load enable input for IC207
23 VER O Hardware version control signal output
24 ANT_SW I TX antenna switch input
25 TEMP_PRT O Temperature protection signal output
26 SCK I EEPROM clock
27 D_GND - Ground
28 SDA I/O EEPROM data
29 D_GND - Ground
30 CONT_5.0V I Switched 5V power supply
31 D_GND - Ground
32 CONT_5.0V I Switched 5V power supply
33 GND - Ground
34 PAG I POCSAG
35 GND - Ground
36 GND - Ground
CN805 (To X53-414 CN400)
1 GND - Ground
2 GND - Ground
3 33MPU I Switched 3.3V power supply
4 OX_SCLK2 I Serial clock input for IC601, IC404
5 GND - Ground
6 OX_SDO2 I Serial data input for IC601, IC404
7 GND - Ground
8 PLL_19_CE I 100kohm load
9 GND - Ground
10 PLL_19_EN I Enable input for IC404
11 GND - Ground
12 REF_LDT O 19.2MHz PLL lock detect output
13 GND - Ground
14 VCXO_DA_EN I Enable input for IC601
15 GND - Ground
16 OCXO_EXIST O OCXO detection signal
17 GND - Ground
18 OCXO_CURR O OCXO current detection signal
19 GND - Ground
20 OCXO_ON I OCXO power on signal
21 GND - Ground
Function