Motorola pro7100 Manuel de service Page 27
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Theory of Operation 2-13
2.3.5 Receive Audio Circuits
Refer to Figure 2-5 for the descriptions that follow.
Figure 2-5. Receive Audio Paths
2.3.5.1 Squelch Detect
The squelch detect circuits are all contained within the ASFIC CMP as shown in Figure 2-5. The
radio’s RF circuits are constantly producing an output (DISC AUDIO) at the discriminator IF IC. The
output signal is applied to the ASFIC CMP’s squelch detect circuits DISC input (U0221, pin 2). The
squelch signal entering the ASFIC CMP is amplified, filtered, attenuated, and rectified. It is then sent
to a comparator to produce an active high signal (CH ACT). The squelch circuit produces the SQ
DET signal at U0221, pin 17 from the CH ACT input signal. The state of CH ACT and SQ DET go
from a low (logic 0) to a high (logic 1) when an RF carrier is detected. The CH ACT and SQ DET
signals from the squelch circuit are applied to the µP pins 84 and 83 respectively.
SQ DET is used to determine all audio mute/unmute decisions except for conventional scan. In this
case CH ACT is a pre-indicator as it occurs slightly faster than SQ DET.
FLT RX AUDIO
J0501
11
16
1
EXTERNAL
SPEAKER
INTERNAL
SPEAKER
ACCESSORY
CONNECTOR
CONTROLHEAD
CONNECTOR
HANDSET
AUDIO
7
2
3
J0401
INT
SPKR-
SPKR +
SPKR -
1
9
2
J0551
4110
INT
SPKR+
4
6
DISC
ASFIC_CMP
U0221
AUDIO
PA
U0271
IN
OPTION
BOARD
IN
OUT
VOLUME
ATTEN.
FILTER AND
DEEMPHASIS
17
MICRO
CONTROLLER
U0101
80
FROM
RF
SECTION
(IF IC)
LIMITER, RECTIFIER
FILTER, COMPARATOR
SQ DET
SQUELCH
CIRCUIT
16
PL FILTER
LIMITER
CH ACT
AUX RX
43
18
LS IO
U IO
AUDIO
83
84
39
URX OUT
17
J0451
EXPANSION
BOARD
DISC
AUDIO
34
28
35
85
IN
7
- Professional Radio 1
- Computer Software Copyrights 2
- SAFETY INFORMATION 3
- W A R N I N G 4
- C a u t i o n 4
- Safety-3 5
- Safety-4 6
- Relabeling 6
- TABLE OF CONTENTS 7
- Chapter 3 Maintenance 9
- List of Figures 9
- List of Tables 10
- Chapter 1 11
- Introduction 11
- 1.3 Related Documents 12
- 1.4 Technical Support 12
- 1.5 Warranty and Repairs 12
- 1.7 Radio Model Information 14
- Chapter 2 15
- Theory of Operation 15
- 2-2 Theory of Operation 16
- 2.2.2 Automatic On/Off 17
- 2.2.3 Emergency 18
- 2.2.4 Mechanical On/Off 18
- 2.2.5 Ignition 18
- Theory of Operation 2-5 19
- 2.2.8 SBEP Serial Interface 20
- Theory of Operation 2-7 21
- 2-8 Theory of Operation 22
- 2.3.2 Transmit Audio Circuits 23
- 2.3.3 Microphone Input Path 23
- 2-10 Theory of Operation 24
- Theory of Operation 2-11 25
- 2.3.4.2 High Speed Data 26
- 2.3.5 Receive Audio Circuits 27
- 2.3.5.1 Squelch Detect 27
- 2-14 Theory of Operation 28
- 2.3.5.4 Handset Audio 29
- ASFIC_CMP 30
- 2.3.6.3 Voice Storage Option 31
- Theory of Operation 2-19 33
- 2.5.1 Power Controlled Stage 34
- 2.5.2 Pre-Driver Stage 34
- Theory of Operation 2-21 35
- 2.6 Frequency Synthesis 36
- Theory of Operation 2-23 37
- 2-24 Theory of Operation 38
- 2.6.4 Synthesizer Operation 39
- Theory of Operation 2-27 41
- 2.8.1 Power Controlled Stage 42
- 2.8.2 Pre-Driver Stage 42
- 2.8.3 Driver Stage 43
- 2.8.4 Final Stage 43
- 2.8.5 Directional Coupler 43
- 2.8.6 Antenna Switch 43
- 2.8.7 Harmonic Filter 43
- 2.9 Frequency Synthesis 44
- Theory of Operation 2-31 45
- 2.9.4 Synthesizer Operation 47
- 2.10.1 Power Supplies 48
- 2.10.2 Power On/Off 48
- 2.10.3 Microprocessor Circuit 48
- 2.10.4 SBEP Serial Interface 49
- 2.10.5 Keypad Keys 49
- 2.10.8 Speaker 50
- 2.11.1 Power Supplies 51
- 2.11.2 Power On / Off 51
- 2.11.3 Microprocessor Circuit 51
- 2.11.4 SBEP Serial Interface 52
- 2.11.5 Keypad Keys 52
- Theory of Operation 2-39 53
- 2.11.9 Speaker 54
- Chapter 3 55
- Maintenance 55
- Maintenance 3-3 57
- 3-4 Maintenance 58
- Table 3-1 59
- 60
- Maintenance 3-7 61
- 3-8 Maintenance 62
- Mobile Synthesizer Section 63
- 3-10 Maintenance 64
- 3.9 VCO Troubleshooting Chart 65
- 3-12 Maintenance 66
- Chapter 4 67
- 6-LAYER CIRCUIT 68
- COPPER STEPS IN PROPER 68
- LAYER SEQUENCE 68
- BOARD DETAIL VIEWING 68
- ZWG0130113 70
- ZWG0130239 71
- ZWG0130240 72
- ZWG0130136 75
- ZWG0130137 76
- ZWG0130241 77
- ZWG0130242 78
- BACKLIGHT GREEN 79
- U0971 Display Driver 80
- ZWG0130229-A 84
- ZWG0130230 A 85
- ASFIC CMP 86
- ZWG0130231-A 86
- ZWG0130232-A 87
- ZWG0130272 91
- ZWG0130270 92
- ZWG0130271 93
- ZWG0130227P 99
- 3,0 -7,5VDC 100
- (SOURCE) 102
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