Audio Interface Board Block Diagram - Motorola ASTRO Spectra Instruction Manual

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

Audio Interface Board Block Diagram

TO
ACCESSORY 2
CONNECTOR J3
TO
SPEAKER
J4
TO
ACCESSORY 2
CONNECTOR J3
TO
SPEAKER
J4
TO
ACCESSORY 2
CONNECTOR J3
TO
ACCESSORY 3
CONNECTOR J3
FROM
ACCESSORY 2
CONNECTOR J3
FROM
LOCAL MIC
J2
TO VU/CLOCK
J6
TO/FROM
ACCESSORY 3
CONNECTOR J3
TO/FROM
ACCESSORY 2
CONNECTOR J3
TO
POWER LED
J5
TO ACCESSORY 3
CONNECTOR
J3
TO/FROM
ACCESSORY 2
CONNECTOR
J3
MAEPF-27884-O
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