Table Of Contents - Furuno CH-270 Service Manual

System Configuration
1. Function Of Each Unit
1.1 Display Unit (MU-100C) ..................................................................................3
1.2 Control Unit (CH-252)......................................................................................4
1.3 Transceiver Unit (CH-273) ...............................................................................5
1.3.1 CPU Board (06P0258)............................................................................5
1.3.2 TRX Board (06P0241) ...........................................................................6
1.3.3 PWR Board (06P0242)...........................................................................7
1.3.4 PRA Board (06P0259)............................................................................8
2. Functional Description
2.1 Transmission .....................................................................................................9
2.2 Reception ..........................................................................................................9
2.3 Raising/Lowering Transducer .........................................................................12
2.4 Tilting Transducer ...........................................................................................13
2.5 Training Transducer ........................................................................................15
2.6 Braking Tilt/Train Motor ................................................................................17
3. Check And Adjustment
3.1 Test Points .......................................................................................................18
3.2 LED Indication................................................................................................21
3.3 Adjustment......................................................................................................22
4. Parts Location
4.1 Display Unit ....................................................................................................24
4.2 Control Unit ....................................................................................................26
4.3 Transceiver Unit..............................................................................................26
5. Maintenance
5.1 Replacement of Grease Cotton .......................................................................32
5.2 Soundome (D) Replacement ...........................................................................32
5.3 Transducer Replacement.................................................................................34
5.4 Tilt Gear Box Replacement.............................................................................35
5.5 Slip Ring Replacement....................................................................................36
5.6 Carbon Brush Replacement ............................................................................37
5.7 Tilt Code Disk Alignment...............................................................................38
6. Troubleshooting
6.1 Flow Chart ......................................................................................................40
Appendix A
CH-250 vs CH-270..............................................................................46
Mechanical Parts List ................................................................................... 48
Exploded view ............................................................................................. D-1
Schematic Diagram .......................................................................................S-1
................................................................................1
CONTENTS