Furuno 1622 Service Manual
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Furuno 1622 Service Manual

Furuno 1622 Service Manual

Furuno 1622 marine radar service manual
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See also: Operator's Manual , Installation Manual
MARINE RADAR
MODEL 1622
MODEL

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Summary of Contents for Furuno 1622

  • Page 1 MARINE RADAR MODEL 1622 MODEL...
  • Page 2 Yo u r L o c a l A g e n t / D e a l e r 9 - 5 2 , A s h i h a r a - c h o , N i s h i n o m i y 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 :...

  • Page 3: Table Of Contents

    CONTENTS Chapter 1. General 1.1 Display Unit ..............1 1.2 Scanner Unit..............2 Chapter 2. Block Description 2.1 General ................3 2.2 Display Unit ..............4 2.3 Scanner Unit..............5 2.4 Functions of Each Circuit board ........6 Chapter 3. Adjustment 3.1 Display Unit ..............

  • Page 4: Chapter 1. General

    Chapter 1. General Display Unit All parts are sandwiched together and fastened by four screws and three connector fixing nuts from the rear side. Figure 1-1. Construction of Display Unit Protection against EMI Many radars use conductive paint inside their covers to protect against EMI (Electro Magnetic Interference).

  • Page 5: Scanner Unit

    TUNE COM (HOT) TUN.IND COM (COLD) MOTOR(+) MOTOR(-) BP/HD P/L-A 10 P/L-B TRIGGER TRIGGER 12 VIDEO VIDEO 13 GND 14 +12V S.M. (HOT) 15 -12V S.M. (COLD) 16 GND 17 SHIELD SHIELD Conventional radars MODEL 1622 Figure 1-2 Antenna Cable...

  • Page 6: Chapter 2. Block Description 2.1 General

    Chapter 2. Block Description General The CPU on the DU board of the display unit communicates with the CPU on the SD board of the scanner unit in RS-422 format. Figure 2-1. Simplified Block Diagram The trigger pulse from the DU board is modulated at the MD board to oscillate the magnetron. The echo received by the antenna is amplified by the IF amplifier and is fed to the DU board as a video signal.

  • Page 7: Display Unit

    2.2!Display Unit Display Unit The display unit features that; 1) DU Board produces LCD back-light voltage of 210VAC. 2) An artificial echo signal (instead of the video signal) can be selected. 3) The interface communicates with the scanner unit in RS-422 format. The TX trigger is made at the gate array (!) and is fed to the scanner unit.

  • Page 8: Scanner Unit

    2.3!Scanner Unit Scanner Unit The scanner unit features that; 1) The powers supply circuit for the scanner unit is provided on the SD board. 2) The SD board in the scanner unit communicates with the display unit. 3) Auto-gain and auto-STC circuits make operation easy. The TX trigger from the display unit is modulated and oscillates the magnetron.

  • Page 9: Functions Of Each Circuit Board

    2.4!Functions of Each Circuit board Functions of Each Circuit board 2.4.1 Display Unit The display unit consists of DU board (03P9268), PANEL board (PNL9194), and LCD indicator (03S9461). PANEL Board Mounted on this board are the operating keys, panel-illuminating LEDs, and electrical buzzer, constituting the man-machine interface.
  • Page 10 2.4!Functions of Each Circuit board While the target scanning system of the radar uses the method of R#$ coordinates, LCD display of this radar employs the method of X-Y coordinates, which is similar to so called TV- sweep method. The sweep time of the LCD display is independent of that of the radar scanning system, so VRAM U116 is provided as the interface between them.
  • Page 11 2.4!Functions of Each Circuit board 2.4.2 Scanner Unit INT Board (03P9271) INT board contains: one-chip CPU U3, that includes the RAM, ROM, and analog ports; U5 including I/O ports the stepping motor drive circuits; and U7 including the A/D converter which outputs tuning, gain, and STC control signals.
  • Page 12 2.4!Functions of Each Circuit board RU-9458 Module This module includes the circulator and MIC circuit that converts the microwave frequency to the intermediate frequency. The circulator switches between the transmitting and receiving microwave circuits so that the transmitting radio energy may be efficiently transmitted to the antenna without leaking to the receiver side and the receiving radar signal from the antenna may be sent with efficiency to the receiver without leaking to the transmitter side.
  • Page 13 2.4!Functions of Each Circuit board Figure 2-4. Block Diagram of INT Board (03P9271)
  • Page 14 2.4!Functions of Each Circuit board Figure 2-5. Block Diagram of MD Board (03P9270)
  • Page 15 2.4!Functions of Each Circuit board Figure 2-6. Block Diagram of IF AMP Board (03P9269)

  • Page 16: Chapter 3. Adjustment

    Chapter 3. Adjustment DANGER Both display and scanner units use high voltage electricity, which endanger human life. Precautions must always be exercised when reaching inside the unit. (1 kVAC for LCD backlighting and 300 VDC for TX) Display Unit Voltage check Remove the resin cover, and measure each voltage.

  • Page 17: Scanner Unit

    3.2!Scanner Unit Scanner Unit Voltage check Open the radome, and measure each voltage with the modulator cover removed. Table 3-2 Item Setting Check point Rating Adjuster TP804#3#"$ % "12 V ST-BY VR801 11.9'12.1 Vdc TP804#4#&$ TP804#6#"$ % "8 V ST-BY 7.8'8.2 Vdc heater volt.

  • Page 18: Chapter 4. Maintenance

    Chapter 4. Maintenance This unit is designed for board level maintenance, not component replacement. Maintenace Parts Table 4-1 Maintenance Parts Parts Type Code No. Remarks DU Board 03P9268 008-499-680 PNL Board PNL9194 008-481-680 MD Board 03P9270 008-499-650 IF Board 03P9269 008-499-640 INT Board 03P9271...

  • Page 19: Replacement Of Major Parts

    4.2!Replacement of Major Parts Replacement of Major Parts Removing display unit cover and shield plate 1. Loosen and remove the nuts from three jacks at the display unit cover. 2. Remove four screws fixing the display unit cover. 3. Remove the display unit cover, the shield cover will be exposed. 4.
  • Page 20 4.2!Replacement of Major Parts Figure 4-4. Figure 4-5.
  • Page 21 4.2!Replacement of Major Parts Figure 4-6.
  • Page 22 4.2!Replacement of Major Parts STS Belt and Motor 1. Unscrew four M3(8 screws (() fixing the bearing retainer. 2. Remove the radiator assembly. 3. Replace the belt (or motor) with new one. No tension adjustment of the belt is necessary. 4.
  • Page 23 4.2!Replacement of Major Parts Magnetron Handle the magnetron, taking the followings into account. 1. Use a non-magnetic screw driver to dismount and mount the magnetron. 2. Keep the magnetron 25mm away from the metals. 3. Never pull the magnetron lead wires. See figure below.

  • Page 24: How To Change System Program

    4.3!How to change system program How to change system program PROM, U115 on the DU Board stores system program. Change the ROM to update the program. Raw ROM Type : M27C1001-10F1 Program No.: 035915800X Replacing program ROM 1. See page 18 to gain access to the DU board. 2.

  • Page 25: Chapter 5. Troubleshooting

    Chapter 5. Troubleshooting The unit does not provides self-test function. This chapter mainly describes how to check each block. Maintenance Menu To open the maintenance menu; 1. Turn the radar on. 2. Wait until the initial screen appears, then press and hold UP and DOWN keys together. 3.

  • Page 26: Error Messages

    5.2!Error massages Error Messages The following messages appear to call the operator’s attention to missing heading or bearing pulses. Check the scanner cable for damage or disconnection when these messages appear. Table 5-1. Error Messages Message Meaning Heading pulse is not applied to the CPU on the DU board. HD-SIG-MISS The heading mark disappears.
  • Page 27 5.3! Troubleshooting matrix table...

  • Page 28: Test Points On Each Board

    5.4!Test points on Each Board Test points on Each Board 1) DU Board)03P9268* Test point Check Item Ratings Remarks DC& TP2/TP1 "9V U3-#5 8.7'9.9Vdc TP3/TP1 Q6-D Switching Waveform (Primary) 21.7'29.4us Adjuster: VR2 "5V TP4/TP1 4.8'5.2Vdc Same reading at between J1- #2(+) and J1-#5(-) TP7/C55 DC-AC Inverter, Primary...
  • Page 29 5.4!Test points on Each Board 3) IF Board)03P9269* Test Point Check Item Ratings Remarks TP601 2.5Vdc TP602 ECHO Waveform 6 TP603 Same as STC waveform TP604 Not measurable 4) STC Waveform Condition ; TX, STC voltage (J809 #9) adjusted to 3.4 to 3.6 V manually. Test Point ;...
  • Page 30 5.4!Test points on Each Board -./001-23"45 678790:)6 .;9/4:-, .-<8=>!" #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-, ;+E&FBGH/ -./:I1"J-KC5 678790:)6 F9L/MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-, ;+E&FBGH0 -./:/16UC5 67879CV)6 F9L/MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& V4::)6D)0:4:-, ;+E&FBGH1...
  • Page 31 5.4!Test points on Each Board -./0L1-<4.;45 678790:)6 .;904:-, .-<8=>!" #&??%@A,)B@)B,*%''B,*B7& C4::)6D)04::-, ;+E&FBGH2 -./0T1"J-K05 67879/)6 F9T:MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-, ;+E&FBGH3 :L.WCXW -.X:C1KYN>5 K*$B)+77&+G,)+F?&G)H+%@)Z+@A 0)?B)L)6 #&??%@A,)B@)B,*%''B,*B7& 04::)6D)C::@, ;+E&FBGH4...

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