Onwa KR-1338 Service Manual Download Page 5

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1. GENERAL

1.1 Outline

This manual provides the information necessary for the servicing and adjustment
of the radars MODEL 1338, 1668.

The antenna unit uses a Log IF amplifier.

The table below shows the major specifications of the each 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
(displayed at manual tuning)

Antenna Rotation

36 NM

64 NM

4.9 V to 32V

about 24 rpm

4 kW

4/6 kW

KR-1338-SME-1

The major parts and P.C. Boards used in the display and scanner units are tabulated
on the next page.

1002XX

Summary of Contents for KR-1338

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

Page 2: ......

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

Page 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...

Page 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...

Page 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...

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

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

Page 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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