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Issue 1.0 06/06/03 INTRODUCTION TO THE IS12 INSTRUMENT SYSTEM The Simrad IS12 Instrument System is a flexible, modular system that offers large, clear displays, easy to operate functions and robust, weatherproof construction. The system is built around a high-speed bus network that provides simple interconnection and data share facilities.
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SIMRAD Issue 1.0 06/06/03 CALIBRATING AND OPERATING IS12 INSTRUMENTS This Service Manual only contains calibration and operational information for those features of the IS12 System which are not normally available to the end user. For details of normal calibration and operation please refer to the appropriate user manual.
IS12 Instrument System Section 3 Assembly Instructions Dis-assembly...
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SIMRAD Issue 1.0 06/06/03 DISASSEMBLY / ASSEMBLY INSTRUCTIONS A strong element of commonality exists between the instrument display units. The Assembly : Case Back (E04000), Assembly : Case Front (E04006) and Bezel : Square (E03799) are common throughout and disassembly and assembly of the various units can be considered to be identical with one exception, in the Wind and Compass Instruments the Piezo Sounder is fitted with a Self Adhesive Insulator Disc (E04227) to protect the Sounder from contact with the Pointer motor.
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SIMRAD Issue 1.0 06/06/03 Fit an Instrument Mounting Gasket to the Case Rear and test the unit to specification. Instrument Remote Controller. Disassembly. Refer to Drawing Number E03800. Remove and retain the 6 3 x 10 mm Screws (200303) from the rear of the unit and ease the front and rear cases apart.
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SIMRAD Issue 1.0 06/06/03 Solder the 4 cable connections to the PCB as shown below: Fit the two halves of the case together, place a Neoprene Washer at each of the corner stand offs and fit the 6, 3 x 10 mm Screws (200303), and tighten down. Complete a full functional check Mast Head Unit / Wind Transducer.
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SIMRAD Issue 1.0 06/06/03 Compass Transducer. Disassembly Refer to Drawing Number E04439. Remove and retain the 3 screws and washers and the Case Top (E02780:BK). De-solder the Cable (E04042) connections from the PCB, remove the strain relief Cable Tie (200026) and withdraw the cable and Grommet (E03701) through the bottom Case (E02781).
IS12 Instrument System Section 5 Circuit Descriptions...
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SIMRAD Issue 1.0 09/06/03 CIRCUIT DESCRIPTION Square Display Unit PCB Assembly Introduction. The PCB Assembly is a generic item which can be used for all square instrument display units. The variants are created by applying different components, software versions and hardware links to the common PCB.
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SIMRAD Issue 1.0 09/06/03 Non-Volatile Memory (NVM). Integrated Circuit IC1 provides 1Kbit of E memory for the retention of important data after power down. CanBus Interface. The IS12 instruments are interfaced by CanBus, a true multi-talker system with high levels of error protection. The bus protocol is encoded and decoded by the dedicated CAN Module built into the microprocessor and IC2 acts as the driver providing the physical layer interface to the interconnection between products.
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SIMRAD Issue 1.0 09/06/03 NMEA In (Mega Instrument Only). NMEA data in is opto isolated by IC13 and fed directly to the microprocessor port P8.4. NB. The NMEA data input employs 2 of the Speed / Log terminals. The Mega Instrument can therefore only be employed to display either NMEA or Speed / Log data.
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SIMRAD Issue 1.0 09/06/03 threshold level is reset at the end of each receive period by the microprocessor port P2.1 via Diode D10. Any signal exceeding the threshold is passed to the microprocessor for processing. Hand Controller PCB Assembly. Refer to Drawing Number E03721. The Hand Controller provides remote control of any display connected into an IS12 network.
SIMRAD Issue 1.0 10/06/03 IS12 Instrument System Section 7 Programming and Configuration...
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SIMRAD Issue 1.0 10/06/03 PROGRAMMING AND CONFIGURATION This Service Manual only contains programming and configuration information for those features of the Instrument System which are not normally available to the end user. For details of normal programming and configuration please refer to the appropriate user manual.