KR-1338/1668 SERVICE MANUAL
Contents
1. 3358 1836 OHS ANE LN EL IK TRON LCT A C i 2 DI ERCUHBC ab Vx nm BOR es RETA RS el 62 b D Tin HT TO ZITATE CADLI US BH Cs ELE SCANNER UNIT TRANSCEIVER MODULE L 315 d CES 1 1 B 5 5 LC T l i i 1 EEE 113 3 s i ATRL A 20051 ERIS E 2 15 a 5 4 1153 55 vail HF 1 Ic n 1523 1 3 4125 EST 3 z Mim 14 1 1 Fill TW ILS 5 1 E 2 T 1111 Zu 3 5 n 1 7 584 55 5 25 1 14 4 0 1 k G YLS 3 3 5 5 2 Fil 3 Tc 159 2 ay 1 7 4 Ev 3 5 KS L 3 5 DE 4 Mx lt 3 27 L 5 E Ell kt S Mi A aod E La c2. TOTAL TX TIME Check that DJ 1 18 on display unit To 2 page 5 12 changes normal Magnetron usage Install new 0V time within about magnetron 2000 hrs Check if video signal is input to display unit Approx 4V No echoes poor Poor sensitivity sensitivity Check if level NG page 5 12 of DJ 1 16 on display unit is normal No echoes white noise appears 9 to 12 V 0V NG No TX trigger KR 1338 1668 Faulty pcb IF 0711 Check TOTAL ON TIME TOTAL TX TIME Faulty pcb MAIN 0910 Check level at DJ 1 i Faulty pcb MAIN 0910 2 on display unit Check if TUNE voltage is KR 1338 1668 5V to 28 V output from display unit Switch from ST BY to TX Check that DJ 1 6 on display unit Faulty pcb MAIN 0910 changes normally Check if TUNE IND Voltage is input to the display unit Switch from ST BY to TX All models 1 V to 2 5 V 47 48 From 2 on page 5 10 KR 1338 300 to 370 Vdc KR 1668 350 to 390 Vdc Check TOTAL ON TIME TOTAL TX TIME KR 1338 Faulty pcb MOD 0904A Within rating rating KR 1668 Faulty pcb MOD 0904B KR 1338 7 4 to 7 6 KR 1668 7 5 to 7 7 Vdc Check magnetron heater voltage at ST BY Within rating ne OK Check magnetron heater 1338 1668 VR 801 on pcb MOD 0904 voltage NG Within rating OK Faulty m
3. E MARTIN II iaag 001 5 1 1 ES C INTERCONNECTION AM nd E HER E Y 72 EET REC CUTS 2 FSC JH GA 130 pe Be ALL LH D 08 z R XS Es ort Fir T n30 2 UTR ri M 1 0 FILTER BOARD E Cl gt E kevin rol Bd dg 11 be ke e Eu 323 fq by Pu Fil 3 oC 15 S 2 I E Ga us 3 JES 1 7 Tu 1 5 RI HT bts kn 1 i 4 E 5 lt 5 TO Kn ME i S 3 T24 3 5 ILI Ib TWF E G II H PEZE A EXER Ic 10 Ha 2 Dl ARES 5 iH 3 5 NAL BOARD T3 53 11213 4 1 ce EN 1 5 IS is T 4 i Ht 3 CHIE GHE 1 TL CTI i OH 5 5 7 5 E d 4 2 as E 7 3 Jo 1 E 1 I lz HH 1 i 17 i SOMMER LN T ALARM TO SCAMMER _ MARTIN DISPLAY KR 13387 1608 DISTAN TTNTT INTERCONNECTIONS BEA TEE n fuv LA BBL
4. Flow chart 3 Flow chart 4 Flow chart 5 Flow chart 6 No echoes nor Flow chart 7 white noise Flow chart 8 Poor sensitivity No GAIN STC FTC effect Flow chart 9 Yes End 39 Symptom Nothing appears on the display Flow chart 1 Keys beep when No No power pressed Check in line fuse Yes Equipment 15 powered LCD backlight lights Faulty LCD assy OK Replace fuse Check LCD display signal Turn on power on the SPU Board NG Check input voltage at connector J1351 on display unit Faulty ped PWR 0913 Results of measurement Faulty LCD assy MAIN 0910 10 2 to 41 6 V Faulty LCD assy Faulty power cable power connector ship s mains NG No power Unplug antenna connector DJ 1 Check voltage at P51 5 5V 2 12V on MAIN 0910 NG Faulty pcb MAIN 0910 40 Symptom Display Abnormal Flow chart 2 Check display output signal on MAIN 0910J MAIN 0910 Fault Adjustment display brill Check brill control circuit LCD Fault 4 1 Symptom No heading data Flow chart 3 Heading data format NMEA 0183 s HDT HDM HDG Blank Heading data indication Heading data indication Check CLK data at HDG connector 3 4 on
5. rz nl Hal ar uk 15 TS XC ALE TAHA TTL ia B Ao HMM Lk 52155 Kendo LOEO HY SIL pus nii SR hl AF J gt Xn Lord 59 MC34168T ALT 21 1015 1 OOMMUHICATEOH GH AVDA TION LTD CREAR TRE REAR 60 TRE II Hd axi LH KR 1338 1668 KR 1838 1968 61 TRANSA VER MODULE a i 120 Ta HS 2 Ha 2 a 4 F7 OFC GA ay IH T 7 Y El 4 c FT 5 L 505 cana uc 3 hc HF 1 CIE SPLX PELT K 3 2 TN YG 2 AH i 003 MCD LH T uen CNET T dps EPL HS 34 C 1 x lt 4 T YELL are 2 8 S K CH TA L ee L m A TZ ATHE Kaz a 1 5 Ca ANE 1 1611 a iav 1 me F IF LMT 2 3 DE H ERa 2 x Z FA LH 7 b EEF eee ee an MEIL IRF Ha a igi
6. 6 sin P zi 0 cin a Ac uom ndo 2 IILO AD pog vIn 9 2048 09 Asong L JIN OL GUT K gt 4 Joqeyeduo tore L gt HLM il 101090 100 dig lt 2191 dW anan gt 2 gt 606080 3l en 31 9n 3 97 gt gt CANIONINOL 15 Modulator PRINCIPLE OF FET SWITCHING MODULATOR High voltage is charged into C through R while the magnetron 1s inactive When the trigger is applied to the power MOS FET the FET turns on and the high voltage appears at the primary winding of the pulse transformer This transformer boots the voltage which makes the magnetron oscillate One advantage of this method 15 that the magnetron oscillates only when the FET is conducive that is the transmission pulsewidth can be changed by the TX trigger pulsewidth Therefore parts such as relay and coil can be eliminated R PULSE TRANS Charge C Discharge 1 MAGNETRON D 1 MOST FET HIGH VOLTAGE TRIGGER Modulator section simple block diagram MODULATOR BOARD MOD 0904 The main function of the modulator section is to produce high voltage pulses to drive the magnetron To produce these pulse the MODULATOR Board has a modulator trigger
7. DJ1 20 ANT I2 V 12 0 to 12 3 V DJ1 1 DJ1 20 KR 1338 SME 8 Output signals from DJ 1 connector Test Item Ratings Test Point Remarks Approx 5 V to28 V KR 1338 1948 Antenna Unit discon TUNE DJ1 20 1968 ected TX Auto tuning Short pulse 0 to 1 0V L P L Medium pulse 7 to 12 V H DJ1 8 DJ1 20 Long pulse 7 to 12 V H Short pulse 0 to 1 0V L Antenna Unit discon P L H Medium pulse 0 to 1 0 V L DJ1 7 4 DJ1 20 ected Tx condition Long pulse 8 to 12 V H Short pulse 2000 to 2300 Hz TRIGGER Pulsewidth 10 to 20 Us All range DJ1 2 DJ1 20 Polarity Positive Polarity 8 to 12 V H KR 1338 SME 9 23 Location of parts on MAIN 0910 VR3 u X VRI lar we ELT ype 5 MAIN 0910 Board Test Point on MAIN 0910 TRIGGER 3 3 Vpp VIDEO 4 Vpp TX Condition 4115 1 0V to 1 2V 20US 2 0V to 2 3V TX Condition 40115 2 6V to 28V STC Curve 60US 3 0V to 3 2V 90115 4 0V to 4 5V 4 Vpp VIDEO Preset Neg Polarity main bang level TX Condition TX TRIGGER 8 to 12V KR 1338 SMC 10 24 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 anti Loc J52 Clutter level Video level 23 VIDEO IN TP7 TP5 VR3 VIDEO Curve LEVEL GAIN TP PRESET AIC GAIN AIC
8. HD SIG MISSING Heading pules is not applied to the SPU pcb BRG SIG MISSING 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 HDG shows 8 2 Check the connection 51 22 Display Unit Exploded view SYMBOL MODE KR 1338 KR 1338 Display Unit NAME FRONT PANEL GASKET LCD PROTECTION KNOB CODE NO KR 1338 001 KR 1338 003 KR 1338 004 KR 1338 009 RUBBER KEY KR 1338 006 10 4 LCD KR 1338 019 RUBBER KEY BASE KR 1338 005 LCD CHASSIS 1338 010 KEY Board KR 1338 030 PROCESSOR Board 1338 027 MAIN CHASSIS 1338 011 KR 1338 012 FILTER Board KR 1338 029 POWER Board KR 1338 028 COVER KR 1338 002 FUSE HOLDER 1338 052 DJ1 1338 051 POWER 1338 40147 WATERRPROOF 7 Pin Air Outlet 9 Pin Air Outlet 6 Pin Air Outlet Bracket GASKET KNOB KR 1338 049 KR 1338 050 KR 1338 048 KR 1338 013 KR 1338 008 KR 1338 007 NOTES 3 4 NO 99 Scanner Unit Exploded View lt RR NAME RADOME UPPER ASSEMBLY HORN RETAINER HORN CHOKE 6005Z BEARING BEARING COLLAR 60057 BEARING IDLE GEAR BEARING RETAINER INNER FEED WAVEGUIDE DOOR KNOB AXIS ACTIVE GEAR MOTOR FIXE
9. WOLVUVdNOD ANOO C V 9 NIVO OLS Wana 21 lt 3 LTA U 3 LIND VNNGLLNV OL 241 EdL 641 441 DONISSHOO Ud MEN E 10 AUTOMATIC TUNING There are two types of automatic tuning peak search and short search The tuning voltage differs from model to model KR 1338 1668 5 V to 28 V Peak search Tuning voltage TUNING point in the figure below is searched in the tuning voltage range 5V to 28V Tuning Indicator voltage TUNING IND is maximum at point Search conditions After initial tuning adjustment Search time 3 sec approx Short search Maximum tuning indicator voltage gis searched in the tuning voltage range 2 5 1 Aft amp 9 initial tuning adjustment 2 When tuning method is switched from manual to automatic 3 When the radar is switched from ST BY to TX 4 When a range where pulselength is changed from short to middle and from middle to long is selected Tracking After short search tracking takes place Tracking voltage 0 V to 32 V Tuning voltage TUNE gt KR 1338 1668 1 3 Time Tuning indicator i P A voltage TUNING IND Pulselength LP MP SP a Peak search Short search Tracking Restores previous pulselength 11 12 TUNING INDICATOR After tunin
10. a 7 Zu U Bil kL we MARTIN AE 10608 1908 E xao SCANNLE UNIT EIS FU AE PTR RINT iiw Xr ET 10 Tu NA ble 55 gt SORES ICM ATIF gt C ZAE T LTD Dum TENE DEELT tiai TA n 17 25 Larg 63 Im 8 LE 2 3 HII UZHE T LONWA ONLY 2 OTHER RADAR iww Mi MODULATOR BOARD EXPRESS COMMUNICATION 0410 ATIOW COMPANY L PE PIE FE 64 CSR l 4 1 1 10 121 THT Er ELD 192 1338 1668 1838 1968 ATION E RATDATICH OMPAIY 248 E 65 1 2 3 3 4 3 D H i TAIT sak Se E 1 3 4 A 3 8 9 Di E MEC 1 1 EBS L 2 54 MIOTCH LL CONT 1 4 1 5 3 FET 13 4 11 s R 11 4 VIDEO CUMIN G D D 201 13 tak D 1 SPAR n hy 5 5 9 i I DEA WA 232 MARTIN D 41 E KI2 1338 1668 CHECKED 3 M KR l 83 N 965 SIGNAL CABLE AITROYED Lek TYPE CHEMA
11. 0904 Location of Parts on MOD 0904 sss sss sss 6 Location of Parts on IF 0711 Mee 4 ee eee 4 l Remarks on Replacement of Major Parts sss sss ess ese eae 4 2 Life P dd d of Parts 60 RRR RRR RRR 6684 4 3 Menu tree oaa O 15 17 18 19 20 24 25 32 233 34 35 8535 20 37 5 TROUBLESHOOTING 5 1 Outline 52 Troubleshooting Flow sss sss sss sss ses ccc RRR ccs 5 3 Message Indication Display Unit Exploded Scanner Unit Exploded MIA REED Schematic circuit TT ee diced DS 38 noe 39 52 54 58 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 Maximum range 36 NM 64 NM Program Number 1002XX XX Tuning Voltage displayed at manual tuning 4 9 V to 32V Antenna Rotation about 24 rpm Antenna R
12. L 19 Alm Sense LV Low Mid High 20 Dead Sector Off On 3061 1010 21 Range 36 48 1048 1 8 1 4 1 2 3 4 1 1 5 2 3 4 6 8 12 16 24 36 48 64 1064 22 Color Setting 23 Self Test 24 Installation Setup 1 Nav Talker All GPS 2 Depth unit m fa ft 3 Temp Unit C F 4 Hdg Sensor Magnet Gyro 5 Key Beep Off On 6 Scan Stop Rotate Stop 7 Dead Sector 8 Tune Video Adjustment 9 Heading Alignment 10 Sweep Timing Adjustment 11 MBS Adjustment 12 Ant Height Low Mid High 13 STC Curve Sharp std Gntl 14 Ope Mode Master Slave 15 Hours in Use 16 TX Hours 37 38 5 TROUBLESHOOTHING 5 1 Outline This chapter provides troubleshooting flow charts and describes error messages Error messages When there is no bearing pulse signal the display unit shows 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 technician to diagnose problems To use the flow charts First find the symptom and its flow chart number in the flow chart on page 5 2 Then follow appropriate flow chart to troubleshoot 5 2 Troubleshooting Flow Charts Nothing appears on display Yes Abnormal display Yes No heading data Yes No nav data Yes Key s inoperative Yes Antenna dose not rotate Yes Flow chart 1 Flow chart 2
13. SEA L 2 3 BEARING P HEADING P STC 12 VR2 CURVE 1 gt 1 a t Video level Conditions A C AUTO OFF A C SEA fully counterclockwise A C fully counterclockwise TX on 12 nm Table 3 5 video level TP5 on SPU pcb trigger at TP1 5 5 1 500 to 700 mV V2 4 2 02v 25 26 Gain preset Conditions STC curve AUTO OFF SEA fully clockwise A C RAIN fully counterclockwise GAIN mee fully Clockwise Scanner ee eee cee OFF INSTALLATION SETUP 1 menu 4 Anton Tx STOP Table 3 6 Gain preset SPU pcb trigger DIV at TP 1 5 V 0 04 to 0 06V Conditions A C fully clockwise ses ess fully Clockwise TX on 12 Table 3 7 STC curse _ Rating at60 uS Ant Height on Check Point poi Installaion Setup menu Adjuster nt 3 1 0 1 3 60 2 VR2 2 5 50 2 HIGH ANT height setting Setting in the field Antenna height STC curve adjustment should be set Radar at installation to match the STC curve with installation conditions This 1s especially important when sea conditions changes over time rotation of the STC VR may erase both sea clutter and legitimate targets if the STC curve is not suitable 1 Set antenna height on the Installation Setup 1 menu If both sea clutter and echoe
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15. circuit modulator pulse generator and booster pulse transformer The modulator trigger circuit consists of U805 and associated components This circuit generates the pulses which cause modulation FETs Q805 Q806 to conduct The pulses are produced when the TX TRIG pulses from the display unit is recei ved U805 conducts The voltage of the pulses is raised at pulse transformer T802 until it is 3 5 kV This circuit adjusts the electrical curent flowing into the magnetron so it 1s 3 A The MODULATOR Board also contains the TX high voltage circuit and the mag netron heater circuit The TX high voltage circuit charges capacitors with 300 V high voltage produced at the primary windings of T801 and discharges them once the TX TRIG pulse is received The magnetron heater circuit produces stable 7 5V 16 BLOCK DIAGRAM OF MODULATOR PCB MOD 0904 7080 GOW 82d INVDVIG MOO IY 2080 1037125 bs tosar TO SNVUL GON NOXISNOVA asa uno ovn kia 9080608 5080708 sosn msiaa oniLxi T 4 2 9 DOL 1 N 10841 908f 1081 U 714 LOS A 145444 LIOA LSNOO 2 HVH 4 21 DAZI 9081 4 1081 ANI ONIHOHLIMS GOW LI EDA
16. displau unit Check HDT HDM HDG Turn power off and on output setting Turn power OFF and ON OK Normal Faulty pcb SPU 9211 OK Check HDT HDM HDG output setting Faulty heading sensor or its OK interconnection cable Check HDT HDM HDG output setting Heading data from heading sensor temporarily interrupted Heading data from heading sensor momentarily interrupted Faulty heading sensor or its interconnection cable Faulty pcb MAIN 0910 or wrong heading data format 42 Symptom No nav data Flow chart 4 Nav data indication Some data shown by asterisks or blank All data shown by asterisks or blank Check RD NMEA 1 2 connector on display unit with oscilloscope Check nav equipment s output sentences Faulty nav equipment or interconnection cable Select sentences to be output Faulty pcb MAIN 0910 or NMEA 0183 not Wrong data sentence format selected at nav equipment selected at input or output side 43 44 Symptom key S inoperative Flow chart 5 Faulty pcb MAIN 0910 Faulty or VR2 pcb KEY 0912 51 to 512 on pcb KEY 0912 Faulty lines 10 and 11 KEY 2 of the W301 on KEY 0912 Cable between pcb PNL and pcb SPU damaged Faulty pcbMAIN 0910 Single vertical row only Single vertical row of keys is faulty All keys Cable between pcb PNL and pcb SPU d
17. power switch is off ship s mains 1s supplied The power supply circuit is basically consists of a main inverter and a sub inverter The main inverter derives the isolated line voltages 12 V ANT 12 V and 12 V ANT 12 V from the main input The sub inverter derives 5 V and 32 V from 12 V output of the main inverter Main inverter The PWR switch becomes open when it is set to on position When the PWR switch is pressed about 9 V 1s input via PWR line P1302 13 Q2 is on and DC 10 V is applied to the PWM When power 15 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 AC voltage obtained on the secondary windings are rectified and smoothed to 12 V and 12 V and delivered to various circuits in the equipment The voltage taken from the 12V line 15 fed back to the PWM controller through the Vrli to maintain the 12 V output constant Sub inverter U5 and the associated circuit form a PWM switching regulator for 5V and 32V The voltage taken from 5 V line is fed back to U5 through R37 resistance to maintain the 5 V output constant Protectors Protection of power supply circuit 1s achieved by stopping the drive signals to the switching FETs Q3 4 Qverload on 5 V and 32 V line is detected by U6 Overload on 12 V MOTOR line is detected by U7 When the 5 V and 32 V line is reduced by a heavy load U6 or U7 bec
18. version External Buzzer output 12 V source pulse Open Collector Slave Display output TRU HD BP TRU TRIG VIDEO NMEA 0183 Format any talker 59 5 Kes DDT 6 GLL HDM HDT 56 MTW Nav Data RMA RMB V HW 5 Standard 0 75 m Compass safe Distance Steering 0 6m KR 1338 SME 5 ENVIRONMENTAL CONDITIONS KR 1338 KR 1668 Ambient 25 C to F700 Temperature Display Unit 15 C to 355 Relative humidity 93 2 orless at 40C 3C KR 1338 SMJ 6 POWER SUPPLY amp POWER CONSUMPTION KR 1338 KR 1668 10 5 Vto 40 0V DC Power 48 W approx 56 W approx KR 1338 SME 7 2 BLOCK DESCRIPTION 2 1 Overview The simpified block diagram of the system 15 illustrated below Scanner Unit Display Unit HD BP Video Processor Trigger RF Module E oc TX The trigger pulse from the PROCESSOR Board is delivered to the MODULATOR Board oscillates the magnetron and then radar wave is emitted from the radiator RX The 9 4 Ghz echo signal received by the antenna 1s converted to 60 Mhz signal by the MIC amplified by IF Amp and fed to the PROCESSOR Board as video signal It is digitally processed and then displayed on the LCD 2 2 Display Unit Power Supply Circuit PWR 0913 The constant voltage generator Q1 is in operation even when
19. 370 TX 290 to 330 Vdc Long 0 25 to 1 2 Vdc Short 5 urrent 0 7 to 1 2 Vdc Medium TX Long 0 9 to 1 1 Vde Long Condition END N ag KR 1338 SMC 12 30 Location of parts on IF 0711 IPS IP7 TPS TP3 Test point on IF 0711 T2 KR 1338 SME 13 31 Location of PCBs in Transceiver Module KR 1668 IF MAP Board 1 0711 Magnetron V801 Transceiver Module BEARING SIG GEN Board HBP0904 MODULATOR Board 0904 17 a 1511 Transceiver Module Cover removed 32 Location of Parts on MOD 0904B TP802 801 a H 14 4 3 2 5 1 E 2 0 Test point MOD 0904B Test Point Test Item MAI 801 TRIGGER 212 as MAIN 0910 1 6 Display Unit wan N ST BY 300 to 370 Vdc TX 300 to 340 Vdc Long 0 5 to 1 45 Vdc Short 5 urrent 0 95 tol 46 Vdc Medium 1 15 to 1 35 Vdc Long END Sala BL ET 13 47 ob N 4 22 5 ias A EEM 243 x b GOW YMNO N G 2 7 060 TX Long Condition KR 1338 SMC 14 33 34 Location of parts on IF 0711 T2 1338 5 15 4 MAINTENANCE 4 1 Remarks on Replacement of Major Parts Turn off the power before replacing any parts Do not touch the magnetron while the ra
20. D PLATE SW MOUNTING PLATE AMP LID IF AMP PCB M AMP CASE SHORT END WG RETAINER SLOTTED WG LATTICE RF CHASSIS COVER MAGNTRON MODULATOR MOTOR CIRCULATOR RF CHASSIS MOUNTING BASE PACKING FOR RADOME RADOME BASE 1338 KR 1338 SCANNER UNIT CODE NO KR 1338 053 KR 1338 069 KR 1338 064 KR 1338 073 KR 1338 090 KR 1338 075 KR 1338 090 KR 1338 083 KR 1338 074 KR 1338 072 KR 1338 061 KR 1338 080 KR 1338 081 KR 1338 076 KR 1338 079 KR 1338 064 KR 1338 102 KR 1338 088 KR 1338 059 KR 1338 060 KR 1338 062 KR 1338 067 1338 071 KR 1338 063 KR 1338 087 KR 1338 101 KR 1338 089 KR 1338 086 KR 1338 058 KR 1338 057 KR 1338 055 KR 1338 054 NOTES 55 56 57 2 LIL KR 004 10 15 20 DISPLAY UNIT 1003 P X H a T ES DIS 3 1 1117 trsi r A ee A e E FILE mov Pe RIS LC LL TI DI or La E EIST 5 Wei L L DEM
21. ONWA KR 1338 1668 KR 1338 1668 SERVICE MANUAL 10 4 TFT COLOR MARINE RADAR TABLE OF CONTENTS l 2 Boards amp Major um 1 3 Specifications 2 BLOCK DESCRIPTION 2 1 Overview 2 2 Display Units ss sss sss sss sss ccc ees hh ccs Block Diagram of Power Supply rest see ener eee Block Diagram of Processor PCB 0910 64844564 2 3 Transceiver Unit Block Diagram of IF 0711 e e ccc e Block Diagram of Modulator ss sss sss sss sss sss ses 24 Different Points of Similar PCBS ccc ccc ccc ccs ccs ccs 3 1 Adjustment of Display Location of Parts on MAIN 0910 sss sss sss sss 28 29 30 21 Location of parts on 0913 3 2 Adjustment of Scanner Units see eee eee ree Location of parts on 0904 ee sss hh Location of Parts on IF 0711 e I M Location of PCBs in Transceiver Module KR 1668 n 57077 BEARING SIG GEN Board
22. PI lt r080 GOW ES r 17 18 2 4 Different Points of Similar PCBs 1 How to set SPU MAIN 0910 Board This board 1s set at factory for use in the KR 1338 For use in the or 1668 change the factory menu as below While pressing and holding down the GAIN HM OFF control press the MENU key five times to display the factory menu Factory MENU 1 Max Range 36 48 64 2 Type R G N 3 Model KR 1998 KR 1648 KR 1668 4 Language ENG CHN 5 Default Setting ENTER X3 lt Press MENU key to escape gt M1338 SME 09D 1 MAX range 36 nm KR 1338 48 nm 1648 64nm KR 1668 2 Type R Regular G German N Netherland K Korea 3 Model Selects the Antenna Unit KR 1338 KR 1648 KR 1668 4 Language CHN Chinese ENG English 5 Default Setting Default settings except factory menu can be restored by selecting Default Setting and pressing the ENTER key three times Restart radar settings After changing the setting the installation adjustment heading timing etc Must be carried out again 2 MODULATOR board MOD 0904 A B E version of MOD 0904 15 not compatible with A version This is because B has larger pulse transformer 3 ADJUSTMENT WARNING IMPORTANT SAFETY INFORMATION Be sure to read all the safety information which follows before perfoming any adjustment Hazardous Voltage This equipment uses high voltage electricity which can
23. SHOCK BURN or cause DEATH Always make sure the electrical power 1s turned off before attempting to change a component or inspecting the inside of the equipment A residual charge may exist 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 the Scanner Unit Mast Work on the scanner unit mast in dangerous and doubly so if the proper precaut ions are not taken 1 Post an appropriate warning sign near the display unit to indicate that work on the scanner unit is being performed to prevent accidental application of the power to the scanner unit 2 Wear a safety helmet and always be aware of where the scanner radiator 15 19 3 1 Adjustment of Display Unit 180 0 R mom 5 POWER 0 0 RI 0 000 NM IOS a e 5 Display Unit Front side of view Power Connector GND OPTION DJ 1 Connector Fuse Holder UPGRADE GND NMEA 1 Connector MEA 2 GND N Connector Display Unit Rear side of view 20 C V 29 o OO a TOC EG 0560 NIVIN VMNO Inside of Display Unit Processor PCB 21 22 Inside of Display Unit Power PCB Line Voltage 12 1 to 12 3 DII 10 4 DJ1 20 ST BY 4 9 to 5 1V DJ1 23 DJ1 20 11 6 to 12 8 V DJ1 14
24. agnetron or MIC From 8 on page 5 10 m m NM 2 NM 12 NM Check TX pulselength selection signal 0V 12V Check DJ 1 7 8 on display unity for Faulty pcb MAIN 0910 proper operation Magnetron usage time within in 2000 hrs Replace magnetron Check if AUTOMATIC TUNE voltage is output from KR 1338 1668 5 V to 28 V display unit Switch from ST BY to TX Check level at DJ 1 6 on display unit changes Faulty pcb MAIN 0910 normally Check TUNE IND Voltage input to display unit Switch from ST BY to TX All model 1 to 2 5V Faultu MIC KR 1338 1668 Faulty pcb IF 0711 49 Flow chart 8 GAIN can be adjusted SEA can bex NG adjusted OK A C SEA can be NG adjusted OK End 50 Symptom GAIN STC effect Check voltage at J101 15 on SPU board Bo Faulty Vrl on KEY 0912 board MIN MAX approx 4 V Faulty pcb SPU 9211 Check voltage at J101 15 on SPU board NG Faulty Vr2 on KEY 0912 board MIN MAX approx 4 V OK Faulty pcb SPU 9211 Check voltage at J101 14 on SPU board Bus Faulty Vr3 on KEY 0912 board MIN 0V MAX approx 4 V OK Faulty pcb MAIN 09101 5 3 Message Indications The following messages appear to call the poerator s attention to missing heading bearing or gyro pulses
25. amaged Faulty pcb MAIN 0910 Symptom Antenna dose not rotate Flow chart 6 Antenna dose not rotate Stop Menu setting Installation menu MOTOR on DJ 1 connector after TX key 15 pressed Faulty interconnection cable between display unit and antenna unit Faulty motor End 12 V DJ 1 several seconds Change Scan stop setting to Rotate 0 V DJ 1 1 when TX key is pressed 5 V several seconds after TX key is pressed Check at J103 17 on pcb MAIN 0910 0 V several seconds after TX key is pressed Faulty relay K1 on PWR 0913 board TX mode Faulty pcb MAIN 0910 ST BY mode Faulty pcb KEY 0912 K1 45 Symptom No echoes nor white noise Flow chart 7 NG GAIN VR at maximum Set GAIN VR at maximum Confirm GAIN control voltage with VR fully CW Is J101 15 on MAI 0910 about OV Faulty on KEY 0912 board Y Check if video signal 1s White noise input to display unit Approx 4V Level of U41 3 on MAIN 09101 norma Check for shorted or disc onnected video signal line Faulty pcb MAIN 0910 between anntena unit and display unit Disconnected or Faulty cable on video line shorted 12 V line on Faulty cable on video line antenna unit Faulty pch IF AMP KR 1338 1668 IF 0711 46 Symptom Poor sensitivity Flow chart 8 Check TOTAL
26. an be checked at 23 Self Check on the MAIN menu Self test Key test Press each key and check on screen indication lights Program No 0359139 1xx ROM OK RAM Hours use 000026 6 H Tx hourse 000012 7 H Program number and revision level 4 2 Life Expectancy of Expendable Parts BM 9256 1000 139 918 than 3000 hrs T Scanner motor BM 8256 more than 5000 hrs Under normal operating condition 2 Hours during ST BY are included MSF1421 than 2000 hrs 2 MAF1421 EET than 2000 hrs 2 Magnetron more than 2000 hrs 2 Krees KR 1668 KR 1338 SMC 16 36 4 3 Menu tree RINGS Off 1 2 3 max EBL OFFSET Off On SHIFT On ZOOM Off On MODE HU CU NU TM DISP DATA ECHO TARIL Off On ECHO STRTCH Off ES1 ES2 ARPA MENU OTHER MENU 1 Display 2 3 Vectpr ref 1 Panel Dimmer 1 2 3 4 4 Vectpr Leng 2 Mark Brill 1 2 3 4 5 History 3 HD Mark 1 2 3 4 6 CPA SET 4 Characters 1 2 3 4 7 SET 5 Trail Tone Single 8 AUTO ACQ 6 Int Reject Off 1 2 3 7 Pulselength Short Long 8 Noise Reject Off On 9 Trail Time 15S 30S 1M 3M 6M 15M 30M Cont 10 Tone Auto Manu 11 Disp Data Off Nav ARP AID 12 WPT Mark Off No 13 EBL Ref Rel True 14 VRM Unit nm km sm 15 Watchman Off 5M 10M 20M 16 STBY DISP Norm Econo Nav 17 Guard Mode In Out 18 Cursor Posi B R L
27. complete signal s input 1s 1 comes the synchronization by the connection 1 the connection signal is fastest 2 The NMEA signal after or before radar starting 1n may but in signaling process if the NMEA port 1 loss of signal will possibly cause other port data not to be able to transmit normally Must remove this kind of condition only to be able again starting Turning on off antenna rotation The SPU board controls antenna rotation In normal operation the antenna rotates during the TX condition However the antenna can be stopped during the TX condition thru the Installation setup menu PWR 0913 BOARD TX KEY PRESS gt 51 1 1302 11 TO ANTENNA MOTOR P1302 1 Tx 12V ST BY 0V 13 14 2 3 Transceiver Unit MIC The following description is for reference only As a general rule of thumb the radar requires better noise figure NF and better dynamic range Both factors 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 w RF amplifier NJT 1968B MODEL 1338 1668 void DOUBLE RF INO BOAK CONV LIMTER FET AMP BALANCED 2 OUT MIXER r POWER FET OSC GND 5V 5V to 35V Block Diagram of NJT 1968B MODEL 1338 1668 BLOCK DIAGRAM OF IF 0711 TILO AI HO WVADOVIC INOO ONINAL 2 4 gt LNOO ONINAL
28. dar is transmitting Sufficient high voltage exsts at the magnetron to cause death MAGENTRON The magnetron emits a strong magnetic field For this reason remove wrist watch before performing the replacement and use a non magnetic screwdriver to dismount the magnetron The estimated life of the magnetron is 2000 hours including time in stand by however actual life depends on usage 1 Turn off the power 2 Dismount the transceiver module 3 Dismount and replace the magnetron 4 When a new 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 long range and measure magnetron current See Chapter 3 for ma gnetron current rating and potentiometer to adjust 6 Reset TX Hours and On Hours on INSTALLATION SETUP menu See page 4 3 for how to access this menu MIC The MIC can be replaced individually No adjustment is necessary after replacement SPU Board Write down settings of MAIN and INSTALLATION menus before replacing the board Then after replacing the board reenter settings Reason Settings are stored in the E PROM UAS on the SPU board 2 IMPORTANT After replacing the board the factory menu setting must be carried out properly otherwise the MIC will be damaged 35 ROM The SPU board uses Flush ROM U36 to store a system program The program version number c
29. g adjustment peak TUNING IND 0 the figure on page 2 5 are stored on to EEPROM The automatic and manual tuning point 9 is also memorized Using these data the tuning indicator extends more than 80 on ALL TX pulses Note that the extension on short pulse is shorter than on long pulse The indica tion becomes shorter with the magnetron deteriorated MANUAL TUNING The manual tuning voltage changes from 5 to 32 V on 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 measured voltage at P52 9 Manual Tuning and tuning adjustment are required when automatic tuning 1s abnormal that 1s low sensitivity FROM PANEL BOARD TO RF UNIT TUNING CONT Operation from power on stand by A square wave is automatically output as a TUNING CONT signal during stand by just after power on the model as follows F VT OV KR 1838 1968 1948 Heading and NAV data Heading data in NMEA format HEADING DATA HDT HDG HDM VHW and NAV data NMEA 0183 can be input from any NMEA input connection THE data from the KEY board KEY 0912 to P8 3 of MAIN board NOTE only one NMEA signal input may select any connection 1f several connections have time the signal input be please main and the most commonly used signal meets in the connection 1 because the
30. omes condctive and consequently disables the PWM controller thro ugh Q6 Q7 and Q8 Overcurrent on the main input line is detected by R13 R14 and R15 The voltage drop across Q6 Q7 and Q8 bec omes large when the inve rter is overload Overcurrent 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 Ul becomes active and disables PWM controller U2 Scanner motor power ANT 12V 12 V 12 V and 12 V ANT 12 V ANT 12 V are used to drive 24 V scanner motor The power to the motor 15 turned on off by the relay K1 on the POWER SUPPLY Board The relay control signal from the SPU Board is supplied to Q52 and Q53 on the POWER SUPPLY Board Pressing the TX key changes the ANT SW signal state from 5 V to 0 V and 1s on to supply 12V BLOCK DIAGRAM OF POWER SUPPLY YOLOW lt ACER lt 6160 ATddAS TAL PUP 141 pamse 01 CI60 TIL DCIVOG YALTA BLOCK DIAGRAM OF PROCESSOR PCB MAIN 0910 LOdNI SIOVSINN AM TINVd 97 Wvuds HSV H 60 8 90 OT OL 4 WANA t OACIA ESSER Ex 620 9 321 45 114 DNIQVHH JS Id ONNVad A XVIN AO NIN VAS 2 V mira 4 JGIACE 6244 TOD
31. otation 4 6 kW KR 1338 SME I The major parts and P C Boards used in the display and scanner units are tabulated on the next page 1 2 Boards amp Major Components PROCESSOR Board MAIN 0910 POWER SUPPLY Board PWR 0913 MODULATOR Board MOD 0904A MOD 0904B IF AMP Board IF 0711 RTB Board CON 0906 BEARINGSIGGEN Board UNIT FCXBC Signal Cable KRC 003 10 10m KRC 003 15 15m KRC 003 20 20m KRC 003 30 30m KR 1338 SME 2 1 3 Specifications SCANNER UNIT Within 20 Sidelobe 18 dB or less 24 dB or less Attenuation o Outside 20 23 dB or less 30 dB or less of mainlobe KR 1338 SME 3 TRANCEIVER ass Intermediate Frequency 60 MHz 25 MHz 0 08 US 0 3 US 3 MHz 0 8US KR 1338 SME 4 DISPLAY UNIT KR 1338 KR 1668 10 4 LCD LED backlight 32 bit TFT color LCD KR 1338 36 nm KR 1668 64 nm 01240 505 1 4 s Range Ringe overval Uie 0 250 23 os 2s pp 1 1 2 2 62 4 14 Bearing Resolution i 1 9 Range Scale nm QN gt NO Better than 20 Range Discrimination Bearing Accuracy Sec Minimum Range Better than 25 m Range Ring Accuracy 0 9 or 8m whichever is the greater VRM Accuracy NMEA three input NMEA 0183 NMEA output NMEA0183 RATLL RARSD RATLL Input Output Terminal Internal easy ARPA
32. s 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 disappear increase voltage at 60 us point Note The following step adjustment of the STC should only be followed when step 1 and 2 do not produce satisfactory results Record the factory setting before adjusting the STC 3 Adjust STC Press the MENU key five times while pressing and holding down the HM OFF control to display the FACTORY menu Operate the trackball to change the maximum effective range of the STC 2 28 Location of parts PWR 0913 Test point PWR 0913 Test Point Test Point Test Point JI NUN Jl 3 30 0 to 35 0 V 1338 5 11 3 2 Adjustment of Scanner Unit Location of PCBs in Scanner Unit KR 1338 MIC Magnetron V801 MSF1421 NJT1968 MODULATOR ets MOD0904 Read Swith Scanner Motor B801 5801 BM 9256 Inside of Scanner Unit 29 Location of parts on MOD 0904A TP802 801 TP801 802 reaa ere t gt 125277 m 7 61 21 8002 060 N 4 5 A di Nm 2 2 E a e Test point on MOD 0904 A Test Point Test Item same as MAIN 0910 TP6 in TP 801 TRIGGER Display Unit ST BY 300 to
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