Trn7391C Audio Interface Board Schematic Diagram (Sheet 2 Of 2) - Motorola ASTRO Spectra Instruction Manual

TP97 TP99
T100
XFMR
6 1
1
A+
5
ELC RECEIVE AUDIO
4 3
C125
100uF
TP100
J1 3
TP98
J1 5
J1 7
J1 9
VR116
C153 C152
470pF 470pF
15V
2
VR108 VR109
6.8V 6.8V
3
4
5
6
7
8
TP30
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
5V
TP22
R222
1K R136
1K
R223 R224
TP33
1.2K 120
24
25
26
27
28
29
30
6881086C22-B
J3 1
RX+
1 Vrms BETWEEN RX+ AND RX -
J3 6
RX-
TP127
TP128 TP126
J3 26
RS232_RXD
J3 27
RS232_TXD
J3 29
RS232_RTS
J3 31
RS232_CTS
TP149
VR115 VR114 VR113
C151 C150
470pF 470pF
15V 15V
15V
J3 24 SPKR_UNMUT E
C148
470pF
VR105
TP144
5.6V
VR110
6.8V
TP54 TP55
J3 4
REMOTE_RX-
J4 2 SPKR_LO
J3 2 REMOTE_RX+
SPKR_H I
J4 1
R146 10
J3 19
PTT*
R153 10
J3 22
MONITOR*
TP124
TP112
TP111
R148
J3 15
UNAVAILABLE
10
R225
TP41
100K
VR102
Q107
6.8V
R150
+ 10
11 R228
R226 R227
5 1.2K
+
_ 7
10K 10K
MC33074A
6 4
U105
SWB+
5V SWB+ A+
JUMPER STATE
JU101 *I N
J14
J6 4 A+
A-B
J3 9 A+
J3 34 A+
*B-C
J3 35
SWB+
J3 16 5V
J15 A-B
*B-C
JUMPER NOTES :
1. AN ASTERISK (*) INDICATES DEFAULT FACTORY SETTING
SWB+
1
TP8
C114
10uF
TO DISSAPATE MAXIMUM 10W
47 RESISTORS IN PARALLEL
PROVIDES 16 OHM OUTPUT
TP107
R152 10
R239
6.8K 5V TP62 TP123
R233
10K
SWB+
CR105
U105
TP48
9 _ 4 MC33074A
Q108
R232
+ 8
TP50
10
+
11 4.7K
R229
TP42
120
R151
R230 R231
10
TP49
VR103
1K
100K
6.8V R154
1K
C155
470pF TP109
VR100
15V TP116
SWITCH
DESCRIPTION
ALWAYS PLACED FOR ASTRO S101 - 1 *ASTRO CONTROL HEAD POWER BUTTON DISABLED
TRANSMITTED AND RECEIVED AUDIO IS ROUTED T O
S101 - 3 *EMER ACTIVE HIGH
TAPE_OUT (ACCESSORY CONNECTOR 3, PIN 11)
S101 - 4 *600 OHM IMPEDANCE
ONLY RECEIVED AUDIO IS ROUTED T O
S101 - 5 900 OHM IMPEDANCE
TAPE_OUT (ACCESSORY CONNECTOR 3, PIN 11)
S101 - 6 LOCAL DESK MICROPHONE NOT PRESENT
SPKR_UNMUTE ACTIVE HIGH (COR)
S101 - 7 DIGITAL REMOTE CONTROL OPTION PRESENT
*SPKR_UNMUTE ACTIVE LOW (COR)
SWITCH NOTES :
1. AN ASTERISK (*) INDICATES DEFAULT FACTORY SETTING
2. SWITCHES S101-2 AND S101-8 ARE UNUSED
SCHEMATIC NOTES :
1. UNLESS OTHERWISE SPECIFIED, ALL RESISTOR VALUES
ARE IN OHMS AND ALL CAPACITOR VALUES ARE IN MICROFARADS .
2. AN ASTERISK (*) FOLLOWING A SIGNAL NAME INDICATES AN
ACTIVE LOW SIGNAL.
3. ALL VOLTAGE MEASUREMENTS TAKEN USING 1 KHZ AT 60% FSD .
5V REGULATOR 5V
9.6V REGULATOR
A+
U100
U104
LT1129CQ
MC78M05
1
IN OUT
TP7
3 4 2
IN OUT SHDN SENSE
R100 C102
2 68K 4.7uF
C115 C119
220pF 4.7uF
TP2
R103
43K
TP152
TP12
SWB+
TP52
R147
J5 1
PWR_LED_A
820
J5 3 PWR_LED_A
TP24
J5 2 PWR_LED_K J13 1
J13 3
J13 2
J3 50
EMER
AUX_RX_AUD
J3 30
J3 33
AUX_TX_AUD
J3 32
FILT_AUD
J3 42
VSENSE 1
J3 45
VSENSE 2
J3 10
V03
J3 18
VI 3
J3 25 VI 1
J3 17
V01
J3 20 V02
J3 39 RESET
J3 36
BUSY
J3 38
BUS+
J3 13
BUS+
TP120 J3 11
BUSY
J3 14
RESET
J3 7
FILT_AUD
5V
CR103 TP46
1
C123
3
2
0.1uF
R133
TP47
10K
CR102
TP45
2
C122
3
1
0.1uF
TP53
J6 3
ANA_GND
J3 37 J3 3
BUS- AUD_SHLD
J3 12 J3 28
BUS- ANA_GND
J3 21
TX-
J3 5
TX+
J3 8 J3 23
TX_AUD DIG_GND
J2 30 CTRL_HD_MIC J3 40 BUS_SHL D
J6 1 J3 44
VU_AUD VSENSE1_SHLD
J3 46 TAPE_OUT J3 47 VSENSE2_SHLD
C156
J3 48
DIG_GND
TP117
J11 2 CHASSIS_GND
TP63
470pF
VR112
TP114 15V

TRN7391C Audio Interface Board Schematic Diagram (Sheet 2 of 2)

ON (CLOSED) OFF (OPEN)
ASTRO CONTROL HEAD POWER BUTTON ENABLED
EMER ACTIVE LOW
900 OHM IMPEDANCE
*600 OHM IMPEDANCE
*LOCAL DESK MICROPHONE PRESENT
*DIGITAL REMOTE CONTROL OPTION NOT PRESENT
AUDIO REFERENCES
9.6V 4.8V 2.2V
UNUSED CONNECTOR PINS
J1 2 TP132
R104 R105 J1 6 TP147
J1 8 TP148
33K 18K J1 12
TP137
J1 14
TP138
C105 C106 C109 R107
J1 16 TP139
.01uF .01uF .01uF 15K
J1 25 TP140
J1 32
TP141
J1 39
TP142
J1 42 TP136
J2 2 TP64
J2 3 TP65
J2 6 TP66
J2 7
TP67
J2 23 TP68
TP69
J2 24
J2 25
TP70
J2 27
TP71
J2 29
TP72
J2 31
TP73
A+
J2 32 TP74
R240 J2 33 TP75
J2 34 TP76
51 J3 43
C142 C141
100uF 100uF TP129 J3 41
TP131 J3 49
TP125 J6 2
9.6V SWB+
C159
C160
0.1uF
0.1uF
U107
_ _
6 4 MC3303 13 4
+ +
7 14
U105
12
5 + +
MC33074A
11 11
9.6V
U107
_
9 4 MC3303
+
8
10
+
11
5V
U103
PWR_GND
VCC
9.6V
C137
U107
0.1uF
13 _ 4 MC3303 GND
+
14
12 +
11
MAEPF-27902-O
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