Service manual

19
Functional Description
DCB, DCFCB and DCFCTB Models
JP12
SINAD
1
Directly to processor pin #58 (ADC7).
2
Ground.
JP13
CTCSS Encoder/Decoder
1
Receive audio, not DC isolated, set to 1 Vp-p with 1 kHz tone at
3 kHz dev.
2
Ground.
3
+8 Volts DC, < 100 mA current.
4
Decode not & PTT line, low with decode, set low by processor
during transmit.
5
Transmit audio, 0 to 2 Vp-p of Digital data or Tone.
JP14
Force Carrier Detect
1
Short to (JP14, pin 2), to force carrier detect on.
2
Ground.
JP15
Short To Set Deviation
1
Short to ISO Ground (JP15, pin 2), causes unit to transmit for
setting deviation.
2
ISO Ground.
JP16
I2C Port
1
2
I2C Data line, buffered.
3
I2C Clock line, buffered.
4
+12 Volts DC, 1 Amp max. current.
5
Ground
6
JP17
Short to Test Relay Output #1
1
Short to pin 2, to engage Relay output #1.
JP18
Short to Test Relay Output #2
1
Short to pin 2, to engage Relay output #2.
JP19
Short to Test Relay Output #3
1
Short to pin 2, to engage Relay output #3.