Furuno CN-24 Service Manual Download

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COLOR NET RECORDER

CN-24

Summary of Contents for CN-24

Page 1: ...COLOR NET RECORDER CN 24 ...

Page 2: ...a J a p a n Te l e p h o n e 0 7 9 8 6 5 2 1 1 1 Te l e f a x 0 7 9 8 6 5 4 2 0 0 Y o u r L o c a l A g e n t D e a l e r A l l r i g h t s r e s e r v e d P U B N o S M E 1 3 0 1 0 A C N 2 4 M AYA F I R S T E D I T I O N M A Y 2 0 0 1 Printed in Japan ...

Page 3: ...UNIT CHECK 3 1 3 1 1 Self Check 3 1 3 1 2 Power Supply Circuit POW Board 01P5737 3 2 3 2 TESTING FUNCTION IN AIR 3 2 3 2 1 Testing Transmitter Unit and Display Unit with Receiving Transducer 3 2 3 2 2 Testing in Air without Paravane Receiver 3 3 3 3 ADJUSTING TRANSMITTER UNIT 3 4 3 3 1 Gain Adjustment 3 4 3 3 2 Depth Indication Adjustment 3 4 3 3 3 Adjusting Transmission Frequency on CONT B Board ...

Page 4: ...7 CALIBRATION OF PRESSURE SENSOR 7 1 8 DISASSEMBLING ASSEMBLING TRANSMITTER UNIT 8 1 SPECIFICATIONS SPC 1 EXPLODED VIEW D 1 MECHANICAL PARTS LIST M 1 ELECTRICAL PARTS LIST E 1 SCHEMATIC DIAGRAM S 1 ...

Page 5: ...he upward and downward transducers are alternately connected to the circuit by the action of a relay 1 2 1 Sounding Rate Two kinds of sounding rates are used to improve coverage area Standard Rate LOW setting Downward Sounding Upward Sounding The time T between the pulses depends on the sounding range setting in the transmitter unit Fig 1 1 Upward and Downward Sounding in Standard Mode High Rate H...

Page 6: ...e processed as follows in the transmitter unit a 0 20m The received echoes obtained from the three soundings are compared and the strongest echo is picked up and sent to the display unit b more than 20m The received echoes obtained from the first sounding are sent to the display unit 1 3 DATA FORMAT FROM TRANSMITTER UNIT The data sent from the transmitter unit to the paravane receiver consist of u...

Page 7: ...ists of 15 bit binary code data and is used to stabilize the oscillation line of the upward sounding picture on the display unit For the modulation of the sync codes the FS Frequency Shift modulation is employed 1 and 0 are modulated at frequencies which are different by 1kHz each other as shown bellow Code Frequency Transmission Frequency 0 1 33 kHz 33 kHz 34 kHz 40 kHz 40 kHz 41 kHz 50 kHz 50 kH...

Page 8: ...ing The received echo signals are transmitted to the paravane receiver with frequency modulated form The echo signals received by the upward downward sounding circuit are converted into 4 bits binary data which represent 15 stages signal level and then converted into FM signal by the V F converter 1 3 4 Depth Data Like the water temperature measurement the detected depth is indicated by the time f...

Page 9: ...1 5 Fig 1 8 Transmitter unit timing chart range 80 80 m and sounding rate high ...

Page 10: ...ach at 10 m deep in the water the pressure switch is turned on and activates the 5 and 15 V regulator on the CONT A board And the transmitter unit starts functioning automatically When the transmitter unit rises above 10 m the pressure switch is turned off and the transmitter unit stops functioning 2 1 3 Upward and Downward Soundings Transmitter Circuit The transmitter circuit for upward and downw...

Page 11: ...2 2 Fig 2 1 Block Diagram of Transmitter Unit ...

Page 12: ...sumption Fig 2 4 Waveforms of received echo signal Fig 2 5 Waveform of carrier signal TVG Circuit Triggered by the TVG Time Varied Gain signal from the CPU on the CONT A board the TVG circuit generates an exponentially rising TVG voltage TVG curve This voltage controls the gain of the amplifier in such a way that the gain is minimum at the time of transmission and gradually increases with time The...

Page 13: ...in the TVG circuit It suppresses the echoes just below the oscillation line making the oscillation line thin so as not to cover the fish echoes close to the head rope CH1 2V DIV 100ms DIV CH1 500mV DIV 2ms DIV CH2 2V DIV 2ms DIV CH1 CH2 0 V Measuring point TP5 VG Sounding rate High Measuring point CH1 TP5 VG CH2 TP6 ...

Page 14: ...nal to the depth across and terminals 3 The voltage detected by the sensor device is once amplified at U1 1 2 and 2 2 then led to differential amplifier U2 1 2 The output of U2 1 2 detected as DEP 1 at TP3 is 1 to 9 V which corresponds to the depth of 0 2000m U1 1 2 and 2 2 are an amplifier of high input impedance and employed to increase measuring accuracy 4 The succeeding differential amplifier ...

Page 15: ...d be used as a pair that is both the sensor and SEN board should be replaced if either of them is defective Temperature Measurement The thermistor which has characteristics shown in Fig 2 10 is used as the sensor device The variation of resistance caused by variation of temperature is converted to variation of voltage shown in Fig 2 11 by the TEMP AMP circuit and fed to the CPU through the A D con...

Page 16: ...20m range the total sampling data are l l 0 5 10 20 40 320 m range 512 256 256 256 3840 x 280 600 3072 Table 2 1 Range Sampling Interval Total Echo Data 0 5 m 1 cm 512 5 10 m 2 cm 256 10 20 m 4 cm 256 20 40 m 8 cm 256 40 640 m 16 cm 3840 The echo data read by CPU is compressed logarithmically from 8 bits to 4 bits and stored in scratch pad RAM U2 until they are read out for signal transmission Thi...

Page 17: ...stored in the RAM are read out one after another according to the transmission format shown in Fig 2 13 Those are D A converted frequency modulated on the CONT B board and transmitted to the paravane receiver Synchronous signals DOWN SYNC and UP SYNC are made by software stored in the ROM and read out at each transmitting timing Fig 2 13 The timers on the CONT A board operate as a frequency counte...

Page 18: ...ontrol helps to conserve battery consumption However in the transmission period of upward and downward sounding data the carrier signal is emitted even when there is no echo signal Refer to Fig 1 8 TX unit timing chart Power Amplifier The output applied to the frequency divider is frequency calibrated and FM modulated signals The frequency divider divides the frequency by 8 to produce the actual t...

Page 19: ...ply circuit is made up of a PWM Pulse Width Modulation Inverter employing switching regulator techniques like other Furuno made echo sounders and radars The PWM inverter universally operates on ship s mains of 10 40 VDC Against the vibration of the load condition it regulates the DC output line by changing the width of its output pulse The power supply circuit provides 12 V 12 V 5V and 130 V for t...

Page 20: ...2 11 Fig 2 16 Block Diagram of Display Unit ...

Page 21: ...e gate array It also acquires ship s speed data by communicating with external navigational equipment in the Furuno CIF format and generates the clock signal for the SUB MCU SYNC code detector The video RAM has three picture pages and one scale character page This enables instant switchover to the picture page selected by the presentation mode Echo Data Acquisition The FM echo signal 9 0 10 0 kHz ...

Page 22: ...pth data LSB acquisition command 16 Acquisition report Fig 2 17 Data Acquisition Sequence by CPUs Reading Panel Setting Status The operator s commands input through the control panel are all sent to the keyboard interface chip U59 via U66 It also collects the frequency data from the AMP board and setting of DIP switch These status and data are acknowledged by the MAIN CPU to be processed following...

Page 23: ...in accordance with the figure 3 1 3 To exit from the self check mode turn off the power PANEL SWITCH CHECK To check keys for proper operation press each key one by one while observing the screen If the key is functioning properly 0 is replaced by 1 when the key is pressed ON 1 OFF 0 Rotary switch contact number DEVICE FUNCTION CHECK Pressing the VENT key moves the asterisk to the item MAIN CPU and...

Page 24: ...e is within the rated value under the condition of maximum brilliance 2 130V line can be adjusted by R28 3 Be careful not to short circuit 130V to ground while power is applied 4 The current consumption of Display Unit is 1 7 to 2 3A Frequency Adjustment Test Point Adjusted by Rated Value Instruments TP10 TP8 R50 69 05 to 70 05kHz Frequency Counter 3 2 TESTING FUNCTION IN AIR 3 2 1TestingTransmitt...

Page 25: ... transmitter unit 3 Placing your finger on the radiating face you can feel pulses if the transmission is made normally 4 Turn on the display unit If all units transmitter receiver cable and display unit are operating satisfactory some echoes are displayed on the screen Note that the depth of echoes is four times greater than their actual depth since sound velocity in air is a quarter of the one in...

Page 26: ...ain adjustment of receiver circuit R35 Maximum gain adjustment of receiver circuit TRS A 01P5742 R38 STC Sensitivity Time Control curve adjustment R10 Offset adjustment of depth measurement circuit R11 Gain adjustment of depth measurement circuit SEN 01P5744 R12 Calibration of water temperature measurement circuit 3 3 2 Depth Indication Adjustment A oil pressurize instrument is required to adjust ...

Page 27: ...ch may destroy the data of EVRAM on the SEN board Do not set the DIP switches S1 and S2 as follows while adjusting the PC board S1 1 2 3 4 5 6 7 8 S2 1 2 3 4 OFF OFF ON ON X X X OFF OFF OFF OFF OFF When the S1 and S2 are set to above the loading mode for NVRAM starts and then all calibration data stored in factory may be canceled In this case readjustment by using the oil Pressurize instrument is ...

Page 28: ...djusted properly Figure 3 5 Lissajous figure 11 Set the DIP switch S2 4 to ON 12 Turn the test switch off 13 Set the DIP switch S1 as shown below S1 Transmission frequency 1 2 3 4 5 6 7 8 50 kHz OFF OFF ON ON ON OFF ON ON 40 kHz OFF OFF ON ON ON ON OFF ON 33 kHz OFF OFF ON ON ON OFF OFF ON 14 Set the DIP switch S2 4 to OFF all bits of S1 OFF 15 Turn on the test switch 16 Adjust R5 on the CONT B bo...

Page 29: ... switches S1 and S2 to the original settings recorded in step 2 3 4 ADJUSTMENT OF DISPLAY UNIT 3 4 1 Color Monitor Adjustment Focus brilliance Call the self check page by turning on the POWER while pressing key of the TM RANGE 1 Set the BRILLIANCE control at maximum 2 Set the FOCUS pot for the sharpest picture Adjusters on the CE MAIN board of the Monitor Unit H PHASE V HOLD S PIN V LIN V SIZE V C...

Page 30: ... blank area surrounding it Set R64 H POSITION so that the upper and lower blank areas become equal in width Set R65 BLUE to the center position Adjust R66 RED so that the reddish brown can be identified under the BRILLIANCE setting of 4 to 6 position NOTE Do not adjust the potentiometers on the CE VIDEO board connected to the CRT neck ...

Page 31: ...S2 and S3 on the DISP board 01P5726 referring to the figure table below Fig 4 1 Locations of the dip switches S1 S2 and S3 S1 SETTINGS For Display No ITEMS SETTING CONTENTS 1 ON M OFF FT ON FA OFF P B 2 Range Unit RANGE UNIT ON ON OFF OFF 3 Data Format NAVS ON CIF OFF NMEA 2 4 Memory back Up BACK UP ON On OFF Off 5 Menu Language CHR ON English OFF Japanese 6 MT 12 Operation 1 PLAY ON TAPE OFF PANE...

Page 32: ... OFF ON OFF 6 Downward Sounding Range DN RANGE ON ON 160m OFF 320 m OFF 640 m 7 ON 80m OFF ON OFF 8 Upward Sounding Range UP RANGE ON ON 160m OFF 320 m OFF 640 m Note 1 The upward downward range settings on the display unit and the transmitter unit must be identical 2 The maximum depth setting of the CN 2220 must be 2000m since the pressure sensor in the transmitter unit is adjusted to 2000m in th...

Page 33: ...e CONT B 01P5741 board The switch is factory set to 80m for both the upward and downward ranges To change the factory setting refer to the figure below Fig 4 2 S1 S2 Location S1 S2 DIP SWITCH SETTING in Normal Operation Mode Note The sounding range determinates the maximum range for echo reception ...

Page 34: ... 36 33 27 HIGH 190 177 165 154 145 130 113 108 99 81 4 2 3 Signal Transmitting Power The signal transmitting power can be changed from 2 4W to 10 W or vice versa by changing the jumper connections Jxx1 and Jxx2 on the CONT A Board 01P5740 Note Increasing output power decreases the battery operating hour by 50 approximately The factory setting of the Output Power is 2 4 W Jumper Settings TX Freq Jx...

Page 35: ...on into RAM temporally 0 1 1 0 x x x 0 0 0 0 0 0 Stores offset data of 3 5 section into RAM temporally 1 1 1 0 x x x 0 0 0 0 0 0 Stores full scale data of 3 5 section into RAM temporally 0 0 0 1 x x x 0 0 0 0 0 0 Stores offset data of 4 5 section into RAM temporally 1 0 0 1 x x x 0 0 0 0 0 0 Stores full scale data of 4 5 section into RAM temporally 0 1 0 1 x x x 0 0 0 0 0 0 Stores offset data of 5...

Page 36: ...1 5 PARTS LOCATION 5 1 DISPLAY UNIT Fig 5 1 Display Unit side view Fig 5 2 Display Unit rear side view DISP Board 01P5726 AMP Board 01P5725 under case MIF Board 06P0136 I F Board 01P5750 PNL Board 01P5729 ...

Page 37: ...5 2 Fig 5 3 Display Unit top view POW Board 01P5737 FAN Degauss Board CE DEGAU Deflection Board CE MAIN Video Board CE VIDEO CRT ...

Page 38: ...E Adjusts blue signal voltage see chapter 3 R66 RED Adjusts red signal voltage see chapter 3 LEDs Names Functions CR12 HALT Always off CR13 SYNC Blinks when sync code is detected Jumpers Functions Jxx1 Jxx2 Jxx3 Set the signal transmitting power see chapter 4 R48 ES SIG R64 H POS R65 BLUE R66 RED S3 S2 S1 CR12 HALT CR13 SYNC Jxx1 Jxx2 TP1 TP3 TP4 TP5 TP6 TP7 TP2 TP8 TP9 TP10 TP11 TP12 U16 Jxx3 ...

Page 39: ... TP4 BLUE Signal output Blue TP5 GREEN Signal output Green TP6 RED Signal output Red TP7 GND TP8 GND TP9 GND TP10 GND O V TP11 Input of digital filter U19 TP12 100K Dip Switches Functions S1 S2 S3 See chapter 4 AMP Board 01P5725 Fig 5 5 AMP board Adjuster Name Adjusting R8 Preset gain Adjust total gain of AMP circuit to 91 dB TP1 TP2 TP3 TP4 TP5 R8 JP1 JP2 Y1 Y2 Y3 Y4 Y5 ...

Page 40: ...r 33 kHz 495 5 kHz for 40 kHz TP4 Analogue GND TP5 IF output Jumpers Remarks Jxx1 Jxx2 See chapter 7 POW Board 01P5737 Fig 5 6 POW board Test Points Names TP1 130 V TP2 15 V TP3 15 V TP4 12 V TP5 12 V TP6 5 V TP7 0 V TP8 Negative line of Ship s Main TP9 Vcc TP10 Adjusters Names R28 90 v ADJ R50 FREQ ADJ TP9 TP8 R50 TP7 TP8 TP5 TP4 TP2 TP3 TP1 R28 TP10 K1 Q1 Q2 Q4 Q3 Q5 Q6 CR12 Q7 ...

Page 41: ...IT CN 2220 Fig 5 7 Transmitter Unit Upward Transducer Link Transducer Downward Transducer Pressure Switch Test Switch Screw Pressure Sensor Temperature Sensor PC board Assembly Gain Adjuster Serial Number of pressure sensor ...

Page 42: ...5 7 Fig 5 8 Transmitter unit PC board assembly SEN Board 01P5744 CONT B 01P5741 CONT A 01P5740 TXSD B 01P5739 TRS A 01P5742 TRS B 01P5743 ...

Page 43: ...f pressure sensor TP4 DEP2 Magnified voltage of DEP1 1 to 9 voltages Adjusters Names Remarkes R10 OFF SET Offset adjuster of depth measurement circuit R11 GAIN Gain adjuster of depth measurement circuit R12 TEMP Adjusts inclination of temperature sensor data TRS A 01P5742 Fig 5 10 TRS A board 01P5742 TP1 TP2 TP3 TP4 R12 R10 R11 U5 NVRAM TP1 TP2 TP4 TP5 TP6 TP7 JP1 JP2 JP3 JP5 R38 R35 JP4 R17 ...

Page 44: ...ain R38 STC Adjust gain at short distance 0 to 2 m Jumpers Remarks JP1 Selects either signals 1 2 MHz or 1 4 MHz 1 2 MHz for 75 kHz and 1 4 MHz for 175 kHz 1 2 MHz Connects CC to CA 1 4 MHz Connects CC to CB JP2 JP3 JP4 Selects outputs of divider in accordance with transmission frequency JP2 JP3 JP4 75 kHz DA DB EA EB FA FB 175 kHz EA DB FA EB GA FB JP5 Selects carrier signals in accordance with t...

Page 45: ... TP1 OWP TP2 TX1 Signal transmission output TP3 TX2 Signal transmission output GND TP7 GND Jumpers Remarks Jxx1 Jxx2 Sets output voltage 2 4 W 10 W Jxx1 A LA A HB Jxx2 B LA B HB Jxx3 Sets according to the link frequency 50 kHz 1 40 kHz 2 33 kHz 2 TP2 TP3 TP1 TP7 Jxx1 Jxx2 Jxx3 ...

Page 46: ...ks R5 Gain R25 Off set See chapter 3 Test points Names Remarks TP1 VFO Output of VCO circuit 8 times the signal transmission frequency TP2 VFIN Output of D A converter clock signal TXSD B 01P5739 Fig 5 14 TXSD B board 01P5739 S1 S2 R5 R25 TP1 TP2 Jumper Put jumper for CN 2220 Put resister 10 k ohm for model CN21 ...

Page 47: ...of Crystal Code No 33kHz NTO 762BA 4885kHz 000 11 8 959 40kHz NTO 762BA 4955kHz 000 118 960 50kHz NTO 762BA 5055kHz 000 118 961 Procedures 1 7 and 8 pin holes for crystal oscillator on the board are shorted by a jumper wire when crystal oscillators are not installed Remove the jumper to install the crystal oscillator for the desired frequency 2 Change the settings of jumper block Jxx1 and jumper w...

Page 48: ...5740 The CONT A board can be used for all three signal transmission frequencies 33kHz 40kHz 50kHz if jumper Jxx3 setting is changed See page 4 4 3 CONT B board 01P5741 The adjustment of potentiometers R5 and R25 and the settings of the dip switch S1 differ with the frequency See page 3 5 4 3 4 TRS A board 01P5742 and TRS B board 01P5743 The TRS A and TRS B boards differ with the sounding frequency...

Page 49: ... adjustment is required 4 Since the calibration date corresponding to the given pressure are stored into the EEROM at every 2 sec after setting the DIP switch set the DIP switch settings after the given pressure becomes stable 5 The calibration data is stored into a RAM on the CONT A board 01P5740 temporally before the final loading into the NVRAM on the SEN board All calibration data stored into ...

Page 50: ... the pressure switch test switch to clockwise 1 5 turn 1 Offset and full scale adjustment 1 Set DIP switches S1 and S2 on the CONT B board as follows S1 1 2 3 4 5 6 7 8 off off off off X X X off S2 1 2 3 4 off off off ON DIP switch settings of X is as follows TX frequency 5 6 7 50 KHz on off on 40 KHz on on off 33 KHz on off off 2 Release pressuring 0 kgf cm 2 3 Adjust the R10 on sensor board so t...

Page 51: ...oral storing the full scale data of 1 5 curve 4 Set the oil pressurize device to 41 2 kgf cm 2 and keep it by a step 8 5 Set DIP switches S1 and S2 as follow S1 1 ON S1 1 2 3 4 5 6 7 8 ON ON OFF OFF X X X off S2 1 2 3 4 off off off off 6 Confirm that the LED lights up from blinking Temporal storing the 0 data of 2 5 curve 7 Confirm that the pressure is 41 2 kgf cm2 8 Set DIP switches S1 and S2 as ...

Page 52: ... 8 off o n on off X X X off S2 1 2 3 4 off off off off 13 Confirm that voltage at TP4 changes is from 9 to 1 volts Temporal storing the full scale data of 3 5 curve 14 Set the oil device to 123 6 kgf cm 2 and keep it by the step 17 15 Set DIP switches S1 and S2 as follow Si 1 2 3 4 5 6 7 8 on on on off X X X off S2 1 2 3 4 off off off off 16 Confirm that the LED lights up from blinking Temporal st...

Page 53: ...il pressure is 164 8 kgf cm 2 22 Set the DIP switches S1 and S2 as follow S1 1 2 3 4 5 6 7 8 off on off on X X X off S2 1 2 3 4 off off off off 22 Confirm that the voltage at TP4 changes from 9 to 1 volt Temporal storing the full scale data of 5 5 curve 23 Set the oil pressure to 206 kgf cm 2 and keep it by a step 25 24 Set the DIP switches 51 and S2 as follow S1 1 2 3 4 5 6 7 8 on on off on X X X...

Page 54: ...7 8 off off off off X X X off S2 1 2 3 4 off off off on Normal mode Caution If turn on the power again before setting the DIP switch to above S2 4 ON All data of NVRAM may broken 3 Confirmation of result of adjustment 1 Turn on the transmitter unit by rotating the screw of the pressure switch test switch to clockwise 2 Set the oil pressure to 0 kgf cm2 3 Confirm that the depth indication on the di...

Page 55: ...8 1 8 DISASSEMBLING ASSEMBLING TRANSMITTER UNIT 1 How to fix or remove the Battery case and End Cover Fig 8 1 Battery case and End cover ...

Page 56: ...8 2 2 How to fix and remove the PC board assembly Fig 8 2 PC board assembly 3 How to fix and remove the Link Transducer Fig 8 3 Link Transducer ...

Page 57: ...8 3 4 How to fix and remove the guide plate and wires from the plug P1 Fig 8 4 Guide plate and Plug P1 P1 ...

Page 58: ...rd and downward transducers When removing the transducer from housing follow to the procedure shown in figure 8 6 Prepare the tool shown in figure 8 6 and carefully rotate little by little Too much rotating may twist off the wire connected to the transducer ...

Page 59: ...8 5 Caution do not pry the transducer with driver Fig 8 6 Removing transducer 7 How to fix and remove the Pressure Switch Fig 8 7 Pressure Switch ...

Page 60: ...8 6 8 How to fix and remove the Pressure Sensor and temperature Sensor Fig 8 9 Pressure Sensor and Temperature Sensor ...

Page 61: ...s 10 20 30 40 True Motion Meters Fathoms Feet Passi Brazars 20 40 80 160 NOTES 1 Display start depth can be shifted in 1 m fa ft p b steps in true motion mode 2 Basic display ranges are reprogram able on the menu 3 Unit is selectable by internal DIP switch 4 Range Shift Available on True Motion mode only Manual 0 2000 m 0 1080 fa 0 6560 ft 0 1200 P B Auto The net trace shifts to the center of the ...

Page 62: ...nterface kit is required 10 Output for external display recorder unit 1 Echo Signal upward downward 2 Net depth Synchronous signal KP is necessary to input Optional E S interface kit OPO1 5 is required Echo Signal can be connected to the color video sounder recorder which have monitor channel 11 Picture Record Playback Picture Recorder MT 12 Optional MT 12 interface kit is required when connecting...

Page 63: ...0 kHz 2 4 W 28 o 3 dB 9 hours LR 20 5 hours BP 2 2800 m max affected by sea condition and others 2 Signal Transmission Mode Sync pulse Frequency shift code modulation Echo Frequency modulation Depth Water Temp Pulse position modulation 3 Sounding Characteristics Frequency Output Beam width Minimum range Max Detection Range 75 kHz 100 W 33 o 3 dB 1 5 m 640 m 4 Sounding Rates and Sounding Range Soun...

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Summary of Contents for CN-24

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Furuno CN-24, Service Manual

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Summary of Contents for CN-24

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