Kenwood TKR-740 Service Manual page 67

TKR-740
TX UNIT (X56-3072-70)
CN307
Terminal Terminal
No. name
- GND Pow er supply ground
CN308
Terminal Terminal
No. name
- RF OUT TX pow er output (coaxial)
CN502
Terminal Terminal
No. name
1 B Fused +B (for external equipment) O
2 B Fused +B (for external equipment) O
3 NC No connection
RX UNIT (X55-3050-11)
CN1
Terminal Terminal
No. name
- RX IN Receive signal input (coaxial)
CN2
Terminal Terminal
No. name
- - Use for RX helical BPF tuning
CN3
Terminal Terminal
No. name
1 IN Use for RX M CF tuning
2 GND Use for RX M CF tuning
CN4
Terminal Terminal
No. name
1 OUT Use for w ide band M CF tuning
2 GND Use for w ide band M CF tuning
CN5
Terminal Terminal
No. name
1 OUT Use for narrow band M CF tuning
2 GND Use for narrow band M CF tuning
68
TERMINAL FUNCTION
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
CN6
Terminal Terminal
No. name
1 RA
-
2 RXG
3 DET
4 DEG
5 SC
6 RSSI
I
7 CK
8 DT
9 ESR
10 EVR
11 SCL
12 SDA
13 DP
-
14 CP
15 EPR
16 LDR
17 GND
18 CVR
19 NC
20 NC
21 B
I
22 B
23 B
24 NC
25 NC
26 NC
O
CN7
Terminal Terminal
No. name
- REF IN
I
-
O
-
O
-
Terminal function
RX Audio (filtered signal)
RX Audio ground
Detector audio
Detector audio ground
Noise squelch control
RX signal strength indicator
Common clock
Common data
Shift register strobe
Electronic volume strobe
RX EEPROM serial clock
RX EEPROM serial data
PLL data signal
PLL clock signal
RX main PLL strobe signal
RX PLL lock detector
Ground
RX main PLL lock voltage
No connection
No connection
Pow er supply (Vcc)
Pow er supply (Vcc)
Pow er supply (Vcc)
No connection
No connection
No connection
Terminal function
Reference signal input (coaxial)
I/ O
O
-
O
-
O
O
I
I
I
I
I
I/O
I
I
I
O
-
O
-
-
I
I
I
-
-
-
I/ O
I