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1.3 Specifications

SCANNER UNIT

KR- 1338

KR-1668

Radiator Type

Radiator Length

Horizontal Beamwidth

Vertical Beamwidth

Slotted Waveguide Array

56cm

120 cm

1.9

Sidelobe
Attenuation

Within 20
of mainlobe
Outside 20

of mainlobe

Polarization

Antenna Rotation

Scanner Housing Stureruct

Compass Safe
Distance

-18 dB or less

-24 dB or less

-23 dB or less

-30 dB or less

Horizontal

24 rpm nominal

Radome

Open nominal

Standard

Steering

0.9 m

0.7 m

1.0 m

0.74 m

TRANCEIVER

KR-1338

KR-1668

MAF1421/MAF1422B

KR-1338-SME-3

Magnetron

Frequency &Modulation

9410 M z

30M z,P0N

Peak Output Power

4 kW nominal

6 kW nominal

Pulse Length &
Pulse Repetition
Rate

0.3

Modulator

Duplexer

Receiver Front End

Tuning

Intermediate Frequency

Bandwidth

FET Switch

Circulator with diode limiter

MIC(Microwave IC)

Automatic or Manual

60 M z

25 M z(0.08

Short Ranges:0.25 nm -1.5 nm)

S, approx 2100 Hz

0.08

S, approx 1200 Hz(Middle Ranges: 1.5nm - 3nm)

0.8

S, approx 600 Hz(Long Ranges: 3 nm and above)

S, 0.3 S), 3 M z (0.8

KR-1338-SME-4

MAF1421B/MSF1421

Содержание KR-1338

Страница 1: ...KR 1338 1668 KR 1338 1668 SERVICE MANUAL 10 4 TFT COLOR MARINE RADAR...

Страница 2: ......

Страница 3: ...Similar PCBs 18 3 ADJUSTMENT 19 3 1 Adjustment of Display Unit 20 3 2 Adjustment of Scanner Unit 29 Location of Parts on MAIN 0910 24 VIDEO Signal adjustment 25 Location of parts on PWR 0913 28 Locat...

Страница 4: ...5 TROUBLESHOOTING 38 5 1 Outline 38 5 2 Troubleshooting Flow Charts 39 5 3 Message Indication 51 Display Unit Exploded view 52 Scanner Unit Exploded View 54 Schematic circuit diagram 58...

Страница 5: ...model The same program is installed on all models but the menu setting through factory menu is different between the models Functions KR 1338 KR 1668 Maximum range Program Number Tuning Voltage displ...

Страница 6: ...d IF AMPBoard RTB Board BEARING SIG GEN Board MIC Board MIC Magnetron Circulator Scanner Motor Signal Cable MAIN 0910 PWR 0913 FIL 0912 KEY 0912 MOD 0904A MOD 0904B IF 0711 HBP 0905 RCN 0907 NJT 1968B...

Страница 7: ...Standard Steering 0 9 m 0 7 m 1 0 m 0 74 m TRANCEIVER KR 1338 KR 1668 MAF1421 MAF1422B KR 1338 SME 3 Magnetron Frequency Modulation 9410 M z 30M z P0N H H Peak Output Power 4 kW nominal 6 kW nominal...

Страница 8: ...crimination Bearing Accuracy Minimum Range Range Ring Accuracy VRM Accuracy Input Output Terminal Nav Data Compass safe Distance Better than 20 m 1 Better than 25 m 0 9 or 8m whichever is the greater...

Страница 9: ...Temperature Scanner Unit Display Unit Humidity Vibration 25 to 70 15 to 55 Relative humidity 93 2 or less at 40 3 IEC 60945 KR 1338 SMJ 6 POWER SUPPLY POWER CONSUMPTION KR 1338 KR 1668 DC Power 10 5 V...

Страница 10: ...on and then radar wave is emitted from the radiator RX The 9 4 Ghz echo signal received by the antenna is converted to 60 Mhz signal by the MIC amplified by IF Amp and fed to the PROCESSOR Board as vi...

Страница 11: ...0 V is applied to the PWM When power is supplied to the PWM controller it starts operation and alternately turns on and off two switching FETs Q3 Q4 connected to the primary widing of T1 The resultant...

Страница 12: ...detector U3 disables PWM inverter U2 when the voltage drop exceeds a certain level Overvoltage of mains input is detected by the U1 When the input voltage exceeds 41 6 V the U1 becomes active and dis...

Страница 13: ...BLOCK DIAGRAM OF POWER SUPPLY 9...

Страница 14: ...BLOCK DIAGRAM OF PROCESSOR PCB MAIN 0910 10...

Страница 15: ...Search conditions After initial tuning adjustment Search time 3 sec approx Short search Maximum tuning indicator voltage is searched in the tuning voltage range of 2 5V 1 After initial tuning adjustm...

Страница 16: ...n M 1668 at the steps of about 0 1 V Manual Tuning is carried out by using omnipad pressing Right side in creases The TUNING continue voltage displayed on the screen differs by about 1V from the measu...

Страница 17: ...the complete signal s input is 1 comes the synchronization by the connection i e the connection 1 signal is fastest 2 The NMEA signal after or before radar starting in may but in signaling process if...

Страница 18: ...however are reciprocal The NF affects long range performance while the dynamic range dose short range performance To improve noise figure amplifier and MBS circuit into the MIC RU 9360 MIC w RF ampli...

Страница 19: ...BLOCK DIAGRAM OF IF 0711 15...

Страница 20: ...a modulator trigger circuit modulator pulse generator and booster pulse transformer The modulator trigger circuit consists of U805 and associated components This circuit generates the pulses which ca...

Страница 21: ...BLOCK DIAGRAM OF MODULATOR PCB MOD 0904 17...

Страница 22: ...it KR 1338 KR 1648 KR 1668 4 Language CHN Chinese English 5 Default Setting Default settings except factory menu can be restored by selecting Default Setting and pressing the ENTER key three times Res...

Страница 23: ...charge may exist in capacitors even with the equipment turned off Always short all supply lines to the chassis with an insulated screwdriver or a similar tool before touching the circuit Working on t...

Страница 24: ...3 1 Adjustment of Display Unit Display Unit Front side of view Display Unit Rear side of view Power Connector GND DJ 1 Connector UPGRADE NMEA 2 Connector NMEA 1 Connector GND GND Fuse Holder OPTION 20...

Страница 25: ...Inside of Display Unit LCD Inside of Display Unit Processor PCB 21...

Страница 26: ...Inside of Display Unit Power PCB 22...

Страница 27: ...Remarks TUNE P L A P L B TRIGGER Approx 5 V to 28 V KR 1338 1948 1968 Short pulse 0 to 1 0V L Medium pulse 7 to 12 V H Long pulse 7 to 12 V H Short pulse 0 to 1 0V L Medium pulse 0 to 1 0 V L Long pu...

Страница 28: ...0 S 1 0V to 1 2V S 2 0V to 2 3V S 2 6V to 2 8V S 3 0V to 3 2V S 4 0V to 4 5V GAIN VR MAX STC VR MAX STC Curve 4 Vpp Neg Polarity main bang level 8 to 12V VIDEO Preset TX TRIGGER TP2 TP3 TP4 TP5 TP6 4...

Страница 29: ...STC 12V SCAN A C AUTO STC TRIG VIDEO Signal adjustment VIDEO signal adjustment is carried out in the processor board This is a simplified block diagram of the video amplified circuit Video level Cond...

Страница 30: ...4 Ant on Tx STOP Table 3 6 Gain preset VR1 V 0 04 to 0 06V Check Point Rating Adjuster TP3 on SPU pcb trigger at TP1 STC curve Conditions A C SEA fully clockwise GAIN fully Clockwise Table 3 7 STC cu...

Страница 31: ...and echoes disappear decrease antenna height setting If sea clutter cannot be comp letely eliminated increase antenna height setting 2 Adjust Vr2 on the SPU board If both sea clutter and targets disa...

Страница 32: ...Point Test Point VR No Remarks TP1 TP2 10 V DC 8 2 to 9 5 V TP3 TP4 TP 31 TP 32 J1 2 J1 7 GND J1 3 J1 7 GND Inverter Frequency 85 5 to 94 5 KHz 12 V 12 1 to 12 3 V VR 1 5 V 12 V 32 V 4 9 to 5 2 V 11 6...

Страница 33: ...justment of Scanner Unit Location of PCBs in Scanner Unit KR 1338 MODULATOR MOD0904 IF AMPBoard IF0711 Read Swith S801 Scanner Motor B801 BM 9256 Magnetron V801 MSF1421 MIC NJT1968 Inside of Scanner U...

Страница 34: ...AIN 0910 TP6 in Display Unit TX Condition TX HV GND 14V ST BY 300 to 370 Vdc TX 290 to 330 Vdc Long 13 to 17 Vdc ST BY ST BY TX Long Condition Mag Heater Mag Current GND 7 4 to 7 6 Vdc 0 25 to 1 2 Vdc...

Страница 35: ...TP 5 TP 7 TP 8 Center Frequency correction For factory adjustment T1 T2 Tuning indicator For factory adjustment 9 V 5 V 9 V 8 7 to 9 3 Vdc 4 7 to 5 3 Vdc 8 7 to 9 3 Vdc 4 7 to 5 3 Vdc KR 1338 SME 13...

Страница 36: ...f PCBs in Transceiver Module KR 1668 IF MAP Board IF0711 Magnetron V801 MIC U801 J701 BEARING SIG GEN Board HBP0904 TP803 MODULATOR Board MOD0904 J812 J811 Transceiver Module Transceiver Module Cover...

Страница 37: ...y Unit TX Condition TX HV GND 14V ST BY 300 to 370 Vdc TX 300 to 340 Vdc Long 13 to 17 Vdc ST BY ST BY TX Long Condition Mag Heater Mag Current GND 7 5 to 7 7 Vdc 0 5 to 1 45 Vdc Short 0 95 to1 46 Vdc...

Страница 38: ...nt Test Item Ratings VR No Remarks TP 1 TP 3 TP 5 TP 7 TP 8 Center Frequency correction For factory adjustment T1 T2 Tuning indicator For factory adjustment 9 V 5 V 9 V 8 7 to 9 3 Vdc 4 7 to 5 3 Vdc 8...

Страница 39: ...magnetron is fitted allow at least 30 minute pre heating under ST BY Turn on the power and measure magnetron current See Chapter 3 for he ater voltage rating and potentiometer to adjust 5 Transmit on...

Страница 40: ...8256 MSF1421 MAF1421 MAF1422 000 139 918 more than 5000 hrs more than 2000 hrs 2 more than 2000 hrs 2 more than 2000 hrs 2 more than 3000 hrs KR 1338 KR 1668 KR 1338 KR 1338 KR 1668 1 Under normal ope...

Страница 41: ...Trail Tone Single Muiti Int Reject Off Pulselength Short Long Noise Reject Off On Trail Time Tone Auto Manu Disp Data Off Nav ARP All WPT Mark Off No EBL Ref Rel True VRM Unit nm km sm Watchman Off S...

Страница 42: ...ows BP SIG MISSING and when is no heading signal HD SIG MISSING Check the antenna cable when those indications appear Troubleshooting flow charts The troubleshooting flow charts help the service techn...

Страница 43: ...eading data Yes No nav data Yes Key s inoperative Yes Antenna dose not rotate Yes Yes Flow chart 1 No No No No No No No echoes nor white noise Poor sensitivity No GAIN STC FTC effect End Yes Yes Yes N...

Страница 44: ...ssy NG Faulty LCD assy MAIN 0910 Faulty LCD assy No No power Check in line fuse OK Replace fuse Turn on power NG NG Faulty ped PWR 0913 OK Check input voltage at connector J1351 on display unit 10 2 t...

Страница 45: ...OK MAIN 0910 Fault NG LCD Fault Symptom Display Abnormal Check display output signal on MAIN 0910J NG OK Adjustment display brill END OK Check brill control circuit OK OK 41 Flow chart 2...

Страница 46: ...OK Check HDT HDM HDG output setting OK OK Turn power off and on OK OK Normal Heading data from heading sensor temporarily interrupted Check CLK data at HDG connector 3 4 on displau unit OK OK Faulty p...

Страница 47: ...h oscilloscope All data shown by asterisks or blank Check nav equipment s output sentences OK OK Wrong data sentence format selected at input or output side Select sentences to be output OK OK Faulty...

Страница 48: ...l keys NG NG Single vertical row only Faulty pcb MAIN 0910 Faulty VR1 or VR2 on pcb KEY 0912 S1 to S12 on pcb KEY 0912 Faulty lines 10 and 11 KEY 2 of the W301 on KEY 0912 Cable between pcb PNL and pc...

Страница 49: ...ral seconds after TX key is pressed Stop Rotate 0 V DJ 1 1 when TX key is pressed Check at J103 17 on pcb MAIN 0910 Faulty relay K1 on PWR 0913 board TX mode Faulty pcb MAIN 0910 ST BY mode Faulty pcb...

Страница 50: ...41 3 on MAIN 09101 normal OK Faulty pcb MAIN 0910 NG NG Set GAIN VR at maximum Faulty VR1 on KEY 0912 board 0V Approx 4V Check for shorted or disc onnected video signal line between anntena unit and d...

Страница 51: ...Check that DJ 1 6 on display unit changes normally OK Check if TUNE IND Voltage is input to the display unit Switch from ST BY to TX To All models 1 V to 2 5 V NG Faulty pcb MAIN 0910 KR 1338 1668 5V...

Страница 52: ...t ST BY Within rating OK OK KR 1338 300 to 370 Vdc KR 1668 350 to 390 Vdc KR 1338 Faulty pcb MOD 0904A KR 1668 Faulty pcb MOD 0904B KR 1338 7 4 to 7 6 Vdc KR 1668 7 5 to 7 7 Vdc Faulty magnetron or MI...

Страница 53: ...itch from ST BY to TX Check level at DJ 1 6 on display unit changes normally Check TUNE IND Voltage input to display unit Switch from ST BY to TX Max Value OK OK OK OK OK Faultu MIC NG NG Faulty pcb M...

Страница 54: ...SPU board Faulty pcb SPU 9211 OK MIN 0 V MAX approx 4 V NG Check voltage at J101 15 on SPU board Faulty pcb SPU 9211 OK MIN 0 V MAX approx 4 V NG Check voltage at J101 14 on SPU board Faulty pcb MAIN...

Страница 55: ...applied to the SPU pcb Bearing pules is not applied to the SPU pcb Appears when bearing signal is interrupted momently 1 Press MODEL key to erase asterisk Momental signal loss 2 Check the connection...

Страница 56: ...Display Unit Exploded view 52...

Страница 57: ...004 KR 1338 005 KR 1338 019 KR 1338 006 KR 1338 007 KR 1338 008 KR 1338 009 KR 1338 010 KR 1338 011 KR 1338 012 KR 1338 013 KR 1338 027 KR 1338 028 KR 1338 029 KR 1338 030 25 KR 1338 002 KR 1338 052 K...

Страница 58: ...Scanner Unit Exploded View 54...

Страница 59: ...R 1338 080 KR 1338 081 KR 1338 083 KR 1338 086 KR 1338 088 KR 1338 087 KR 1338 089 KR 1338 090 KR 1338 090 KR 1338 101 KR 1338 069 KR 1338 102 2 2 2 MODE KR 1338 KR 1338 SCANNER UNIT 32 SYMBOL NAME CO...

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Страница 62: ...58 Schematic circuit diagram...

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