Name: JRC JMA-2253
Brand: JRC
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Cautions for High Voltage3
What to Do in Case of Electric Shock4
First-Aid Treatments4
In Case Pulse Can be Detected5
Tilting Back of Victim's Head5
Blowing into Lungs5
In Case of Cardiac Arrest6
Warning7
High Voltage7
Antenna7
Navigation Aid7
List of Illustrations11
General13
Configuration13
Accessories13
Specifications14
Technical Description19
Radome Antenna Unit19
Radiator19
Radiator Pattern19
Block Diagram of Radome Scanner Unit20
Radiator Rotating Mechanism21
Motor-Encoder21
Bearing Reset Switch21
Open Array Antenna Unit21
Bearing Reset Circuit23
Transmitter Unit23
Receiver Unit24
Receiver PCB24
Range, Pulse Length, and PRF Relationships24
Block Diagram of Open Scanner Unit25
Video Detector Circuit27
Video Output Circuit27
Tuning Indication Circuit27
Gain-STC Circuit27
Display Unit29
Simplified Block Diagram29
Main Control PCB29
Video Input Circuitry29
Block Diagram of Display Unit30
Main Lsi/Video Processor31
Sample Clock Generator31
Buffer Memory31
Video Memory31
Control Pcbs32
GDC (Graphic Control Memory)32
Video Output32
Display Monitor33
Optional Inputs33
Power Supply34
Trouble Shooting Guide35
Master Reset35
Fuse35
Fault Finding Procedure36
Fuses Used36
Operation Checklist37
Inter-Unit Terminal Board40
Typical Voltages and Resistances41
Scanner Unit42
Maintenance43
Radome Scanner Unit44
Lubricating Gears44
Rotary Drive Block44
Drive Motor45
Reduction Gears45
Motor45
Pedestal45
Cleaning the Display Unit Screen46
Installation47
Selecting the Installation Location47
Cabling the Scanner Unit50
Rotary Scanner Unit51
Installing the Display Unit53
Installing the Power Cable53
Display Unit Rear Panel54
J403 NMEA Connector54
Cabling External Buzzer and Other Devices55
Connecting an Electromagnetic Compass56
Modifications to be Made to the Inboard Power Supply57
Cable Assemblies58
Interunit Cable58
Power Cable59
Selecting a Long Cable59
After-Installation Adjustments60
Installation-Time Check60
Functional Check60
Adjustment Steps60
Rectifier Unit61
Adjustment Procedures63
Adjustments to be Made When a Part Is Replaced63
Tune Presetting63
CRT Monitor off Center Adjustment63
Adjusting the Scanner Unit64
Adjusting the AVR Output Voltage from the Modulator64
Adjusting the Transmitter Pulse Width of the Modulator Unit64
Adjusting the Maximum Gain of the Receiver65
Adjusting the Sea Return Level of the Receiver65
Adjusting the Main Bang Suppression Level of the Receiver65
Adjusting the Tuning Indicator Level of the Receiver65
Adjusting the Display Unit66
Adjusting the Brilliance Level66
Adjusting the Focus of the CRT Monitor Screen66
Adjusting the AVR Output Voltage66
Outline Drawing of Scanner Unit67
Interconnection Diagram70

Brand	JRC
Model	JMA-2253
Category	Marine Radar
Language	English

JRC JMA-2253 User Manual

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JRC JMA-2253 Specifications

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