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DX-440
Service manual
Realistic DX-440 Service Manual
Am/fm direct entry communications receiver
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Also See for DX-440
:
Owner's manual
(28 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Contents
Specifications
SW Electrical Performance
FM Electrical Performance
MW Electrical Performance
LW Electrical Performance
Disassembly Instruction
To Remove Back Cover
To Remove PCB A-1 and PCB B
To Remove PCB A-2 and PCB C
Block Diagram
Circuit Description
Pin Configuration
Keyboard Matrix
Liquid Crystal Display (LD-BU7140J)
Pin Connection Table
IC401-CX-7961 A-1 (Frequency Synthesizer PLL) Block Diagram
Control Data Transmitted
Reference Divider Frequency Division Number
Programmable Divider Frequency Division Number
Programmable Divider Frequency Division Number in 20 Bits Chart
Reference Divider Frequency Division Number in 20 Bits Chart
IC101-Μpc1018C (am if Amp, FM if Amp) Diagram
IC102-LA5003 (Regulator) Diagram
IC201-LA3361 (FM MPX Demodulator) Diagram
IC202-TA7366P (Signal Strength, LED Driver) Diagram
IC203-M6900L (Pre-Amp.) Diagram
IC301-Μpc 1263C2/Μpc1316C (Poewr Amp.) Diagram
Alignment Instruction
Alignment for Power Supply VDD
Alignment for Clock Time Accuracy
Alignment for VC01 Voltage Range
Alignment for PLL Frequency
Alignment for am 2Nd Local OSC
Alignment for am 2Nd if
Alignment for FM if
Alignment for am Sensitivity
Alignment for BFO
Alignment for Signal Level and Stop Level
Alignment for MPX
Alignment for FM Sensitivity
Troubleshooting Flow Chart
Scan Auto Stop Does Not Work
Weak Sensitivity on FM Mode
Power Can Not be Turned on
PLL Does Not Work
Weak Sensitivity in am Band
Wiring Diagram - Solder Side
PCB-A1 Top View Diagram
PCB-A1 Bottom View Diagram
PCB-A2 & A3 Top View Diagram
PCB-A2 & A3 Bottom View Diagram
PCB-C Top View Diagram
PCB-B Top View Diagram
PCB-B Bottom View Diagram
PCB-C Bottom View Diagram
Exploded View
Parts List for Exploded View
Before Electrical Parts List
Electrical Parts List
Table of ICS' & Transistors' Voltage List
Transistors
Semiconductor Lead Identifications
Schematic Diagram
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Specifications
2
Block Diagram
3
Troubleshooting Flow Chart
4
Schematic Diagram
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See also:
Owner's Manual
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