Instruction manual

6881086C22-B 67
Audio Interface Board Block Diagram
TO/FROM
CONTROL
HEAD
J2
VSENSE BUS
PTT
CHANNEL
ACTIVITY
MONITOR
TO
CONTROL
HEAD
J9
VEHICLE
INTERFACE
I/O BUS
RESET
BUSY
BUS +
BUS -
TO/FROM
ACCESSORY 2
CONNECTOR
J3
TO ACCESSORY 3
CONNECTOR
J3
TRANSIENT
PROTECTION
VR101, VR102,
VR103, VR104
BUS DRIVER
Q106, Q107, Q108
U105
CONTROL
LOGIC
U103
TRANSMIT
AUDIO
SUMMER
U100-8, 9, 10
DETECT
AUDIO
MUTING CIRCUIT
U106-12, 13, 14
ELC RX AUDIO
SHAPING FILTER
U102-12, 13, 14
ELEC RX AUDIO
LINE DRIVER
Q103, Q104,
U102-1, 2, 3
U102-5, 6, 7
VU AUDIO
BUFFER
U101-5, 6, 7
LOCAL CONTROL
DESK
MICROPHONE
AUDIO BIAS
DESKSET
TRANSMIT
AUDIO
U101-1, 2, 3
DESKSET
RECEIVE AUDIO
IMPEDANCE
16 OHM
RESISTOR ARRAY
TO
POWER LED
J5
TO/FROM
ACCESSORY 2
CONNECTOR J3
TO/FROM
ACCESSORY 3
CONNECTOR J3
TO VU/CLOCK
J6
FROM
LOCAL MIC
J2
FROM
ACCESSORY 2
CONNECTOR J3
TO
ACCESSORY 2
CONNECTOR J3
TO
SPEAKER
J4
TO
SPEAKER
J4
TO
ACCESSORY 2
CONNECTOR J3
TO
ACCESSORY 2
CONNECTOR J3
TO
ACCESSORY 3
CONNECTOR J3
VSENSE
CATHODE
ANODE
FILTERED
RECEIVE AUDIO
PTT
UNAVAILABLE
MONITOR
AUXILIARY
TRANSMIT AUDIO
FILTERED
RECEIVE AUDIO
EMERGENCY
TO/FROM
RADIO
J1
AUX TX AUDIO
AUXILIARY
RECEIVE AUDIO
MIC HI
DETECTED
AUDIO
SPEAKER -
SPEAKER +
AUX RX AUDIO
FILTERED
RECEIVE AUDIO
EMERGENCY
TRANSMIT
AUDIO
DESKSET
TRANSMIT -
T100
ELC
RECEIVE +
ELC
RECEIVE -
SPEAKER
DESKSET
RECEIVE -
DESKSET
RECEIVE +
SPEAKER +
SPEAKER
UNMUTE
TAPE OUTPUT
DESKSET
TRANSMIT +
CONTROL
HEAD
MIC HI
VU/CLOCK
AUDIO INPUT
VEHICLE
INTERFACE
I/O BUS
RESET
BUSY
BUS +
BUS -
SPEAKER
UNMUTE
CIRCUIT
U107-1, 2, 3
Q101, Q102
TAPE OUT
AUDIO
SUMMER
U101-12, 13, 14
R111
S101-7
S101-3
SWB+
820
JU101
ELC RX AUDIO
LEVEL ADJUST
U102-8, 9, 10
ELC
RX AUDIO
IMPEDANCE
MATCHING
(600 or 900)
AUDIO
DATA
CONTROL
SIGNAL LEGEND
MAEPF-27884-O