Service manual

16
Functional Description
DCB, DCFCB and DCFCTB Models
JP4
Test Speaker
1
VCC, +5 V
2
VCC, +5 V
3
Short pins 1 and 3 to give priority to the external transceiver.
4
Short pins 2 and 4 to give priority to the internal receiver.
With no shorting jumper, first carrier detect has priority.
Short both sides when using SINAD board along with JP1.
JP5
Sensor Inputs (#1 at left edge)
1
Pressure sensor input, dry Contact closure < 1 K.
2
ISO Ground.
3
Intrusion sensor input, dry Contact closure < 1 K.
4
ISO Ground.
5
Current sensor input, dry Contact closure < 1 K.
6
ISO Ground.
7
Rotation sensor input, dry Contact closure < 1 K.
8
ISO Ground.
9
48 Volt Battery input to 48 Volt sensor and to power supply,
15–75 VDC.
10
Ground
11
12 Volt Battery input to 12 Volt sensor and to power supply,
11–15 VDC.
12
Ground
JP6
Speaker Mute gate bypass
Short pins 1and2 to bypass speaker mute gate, allow monitoring
of radio channel with local speaker
JP7
Receiver Module
1
Ground
2
+8 Volts DC, < 100 mA current.
3
Synthesizer programming Clock line, 0 to 5 Volt levels.
4
Synthesizer programming Data line, 0 to 5 Volt levels.
5
Synthesizer programming Latch line, 0 to 5 Volt levels.
6
Carrier Detect not line, goes low with carrier, 0 to 5 Volt levels.
7
Receive Audio, De-emphasized, 700 to 900m Vp-p with 1 kHz tone
at standard dev.
8
Receive Audio, Flat.
JP8
Serial and FLASH programming Port
1
2
TXD, standard RS232 levels
3
RXD, standard RS232 levels.
4
Ground.
5
Processor Serial Clock, used during FLASH programming.
6
Processor Reset not, pulsed low (to Ground) during FLASH
programming.