Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...

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Autohelm1. Control Unit PCB Circuit descriptionFig. 4. Circuit DiagramFig. 5. PCB Assembly/Parts List1.1 Power supplyIncoming power is routed to the PCB via PL1 and SKT1. Dl and D2 protect againstreverse connection of the supply. IC1 is a 5v regulator and can also reset themicroprocessor, via TR1, should the supply voltage fall below 6V.1.2 Microprocessor and program memoryIC6 is an Intel 80C32 microprocessor. It can access up to 32k bytes of programmemory (IC5) via the latch IC4. A clock signal for the microprocessor is provided byan 11MHz ceramic resonator (XL1), and associated capacitors CIS and C16.Capacitors C17, C18 and C19 provide decoupling.1.3 LCD and Display driverThe LCD is a Nautech custom part. The display is driven by a Hitachi Led driver (IC3)deriving its drive voltages from resistor chain R27-R30 and VR1. Communication tothe microprocessor is via a 4 bit parallel bus (DB4 to DB7) and the three control linesE,R/W and RS. Capacitors C8 and C10 provide decoupling and resistor R26 theclock signal for IC3.1.4 Negative Rail GeneratorA negative voltage rail is required by the LCD display and is generated by a switchingregulator formed by TR6,D5 and D6. A 4.8kHz waveform is generated from themicroprocessor P3.4 (pin no. 16). This drives a charge pump, via transistor TR16,pumping charge from C20 via D6 to C21. The negative rail is then stabilised by D5and R49.1.5 N.M.E.A InterfaceNMEA data is fed to the control unit via PL2 and isolated from the rest of the circuitusing the opto-isolator (IC7). Diode D3 provides input reverse connection protectionand resistor R15 is tuned to give the desired bandwidth of operation. The output fromIC7 is connected to the microprocessor Port P3.2 (pin 14). Capacitor C7 providesdecoupling.1.6 Seatalk Bus Transmit and ReceiveSeatalk transmit and receive circuitry consists of TR9, 10, 11 ,12, 13, 14 and 15 andtheir associated components. Data transmission is at 4800 baud with a low start bitand line idling high. TR9 and TR13 provide high and low output respectively, whilstTR14 and R45/46 give overload protection to Trl3 in the event of misconnection.TR10 and TR11 allow the microprocessor to monitor its own transmissions and alsoto receive data from other units on the bus.1.7 Keypad operationThe 10 button keypad is interfaced to the microprocessor via 2 dual input multiplexerIC's.2SeaTalk Service Manual
AutohelmEach key is read in turn when the relevant channel is selected via pins p3.5 and p3.6.1.8 Buzzer OperationTR2 and TR3 are configured as an astable multivibrator with a nominal frequency of2.7kHz. TR7 and 8 are used to switch the buzzer with TR7 acting as an inverter toturn the buzzer off during a microprocessor reset.1.9 Illumination DriveTR10, 12 and 16 provide a constant current drive for lamps LP1 and LP2. Thecurrent is set by resistors R11 and R12. TR6 is an inverting buffer to turn off the lightsduring a microprocessor reset. Illumination level's are given by pulse widthmodulation of drive line P3.3 (pin 15).SeaTalk Service Manual 3
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AutohelmAutohelm Inboard Autopilots
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AutohelmST7000 SystemMaster Table o
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AutohelmST7000 System IndexPage1. I
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Autohelm3. Operating/Calibration in
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AutohelmDisplay Key SequenceWatch A
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AutohelmUnsatisfactory Steering Per
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AutohelmWind Change AlarmWind Trim
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AutohelmAdjusting CalibrationIn cal
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Autohelm3. 5 Automatic Deviation Co
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Autohelm5. Track Control interfacin
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Autohelm6. Special functions.6.1 Di
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Autohelm7.1 Service Visit - Diagnos
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AutohelmContentsPage1. Description
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Autohelm5. When finally refitting t
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AutohelmLCD Display Assembly6SeaTal
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Autohelm8SeaTalk Service Manual
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Autohelm1. Control Unit PCB Circuit
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ST7000 Course Computer General Asse
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Autohelm4. Functional TestThe Cours
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AutohelmSeaTalk Service Manual 9
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Autohelm4.3 Course Computer Bench T
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Autohelm4. Product History (Z080 Ma
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AutohelmZ050 Mount Assembly6SeaTalk
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AutohelmContentsPage1. Linear Drive
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AutohelmSlide off the carrier assem
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Autohelm* No load current limits :-
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Autohelm7. Product History Type 2 L
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AutohelmContentsPage1. Rotary Drive
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Autohelmb) When rebuilding the clut
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AutohelmContentsPage1. Hydraulic Dr
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Autohelm3. Reversing Gear Pumps (Z0
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Autohelm4. Type'0'Piston Pump (Z081
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AutohelmContentsPage1. I/O Drive Un
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Autohelm- Position the support plat
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