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Shure PG4 Service Manual
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2
25A1
104 (Rev
.1)
DETAILED DESCRIPTION
Front Panel
1
audio
LED
Indicates strength of incoming audio signal: gr
een for normal, amber for strong, red for peak.
2
ready
LED
Green light indicates system is ready for
use.
3
LED screen
4
channel
button
Back Panel
1
AC adapter jack
2
Adapter cord tie-off
3
XLR balanced microphone output jack
4
1/4” unbalanced output jack
1
2
3
4
3
4
2
1
1
3
Table of Contents
Product Description
1
Features
1
Detailed Description
2
Product View
2
Circuit Description
3
General Block Diagram Description
3
RF Strip
3
The First, the Second Vco's and PLL
4
DC Power Supply Section
4
Audio Section
4
RF and Audio Block Diagram
5
Digital Section
6
Display Circuitry
6
Normal Mode
6
ATE Mode
6
RF Band Resistors
7
Variant Resistor Installation Options for each Band - Table
7
Reference Designators and How the Voltages at the Test Points Reflect the Operating RF Band - Table
7
Microcontroller Netnames and Programming Testpoint List
8
PG4 RSSI Curve
9
Functional Test
11
General Information Lookup Table
11
Required Test Equipment (or Approved Equivalent or Superior Models)
11
Listening Test
11
Tone Key Indicator
12
Audio Output Level and Distortion
12
Frequency Response Using an RF Generator
12
RF Power and Squelch Level
12
Assembly and Disassembly
13
Assembly Instructions (Reverse for Disassembly)
13
Service Procedures
15
Measurement Reference
15
Required Test Equipment
15
Alignment and Measurement Procedure
16
Voltage Regulation Check
16
ATE Mode Setup and Use
16
Initial Setup
16
Power Test Section
17
1St, 2Nd Local Oscillator
17
Front End RF Filters
17
Predictive Diversity Threshold Setting
17
Tonekey Level Detection
18
Noise Squelch Alignment
18
Audio Alignment
18
Audio Peak Light Reference Setting Procedure
18
Additional Product Performance Characteristics (Not Tested in Production)
20
Frequency Tables
21
Product Specifications
22
Troubleshooting
23
Replacement Parts
28
Parts Designations
28
PG4 Model Variation - Table
28
Antenna Parts Numbers
28
PG4 Hardware Replacement Part
29
PG4 PCB Replacement Components
29
PG4 Frequency Dependent Parts
30
Unplaced Component List
31
PCB Layout
32
Schematic Diagram
34
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Shure PG4 Specifications
General
Image Rejection
>60 dB
Tuning Steps
25 kHz
Output Connectors
1/4" unbalanced
Power Requirements
12-18 VDC
RF Sensitivity
-90 dBm for 12 dB SINAD
Audio THD
0.5%
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