Furuno FCV-1200L Скачать руководство пользователя страница 20

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4. TEST POINT, LED and ADJUSTER

4.1 DISP Board (06P0238)

Figure 4.1 DISP board

Test Point

TP Name Measurings

Remarks

TP 1

5 V

5.0 V + 0.25 V

Source voltage of LCD control circuit in LCD Unit

TP 3

PGND

TP 4

2.4 V

2.4 V + 0.05 V

VCO Control Voltage of PLL circuit

TP 7

+12 V

12.0 V + 0.2 V

Source voltage of LCD inverter board

TP 8

+5 V

5.0 v + 0.25 V

+5 V for DISP board circuit

TP10 GND

TP11 GND

TP12

FREQ

70 kHz + 1 kHz

Switching clock of power circuit

Adjuster

Adj. Functions

R65

Adjustsswitching frequency 70 kHz (+ 1 kHz ) measuring at TP12

R75

A12 voltage measuring at TP7

C63

Adjusts VCO control voltage measuring at TP4

TP 7

TP 8

TP 3

TP10

TP 4

TP12

TP1

TP11

R65

R75

F1: 3A

C63

Содержание FCV-1200L

Страница 1: ...COLOR LCD SOUNDER FCV 1200L 1200LM Back ...

Страница 2: ...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 Yo 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 2 3 6 5 0 A F C V 1 2 0 0 L L M M AYA F I R S T E D I T I O N F E B 2 0 0 1 Printed in Japan ...

Страница 3: ...oard 06P0238 17 4 2 Power Board 02P6270 18 4 3 ES Board 02P6271 20 4 4 MAIN Board 02P6269 23 4 5 EXIF Unit 25 4 6 Interface Unit 28 5 WAVEFORM 30 5 1 MAIN Board 02P6270 30 5 2 POWER BOARD 34 5 3 ES Board 02P6271 35 6 TRANSDUCER DATA SETTING 36 7 TESTING TRANSDUCER 38 7 1 Checking transducer with multimeter 38 7 2 Checking impedance at resonant poit 38 7 3 Checking resonant frequency characteristic...

Страница 4: ...ip FCV 1200LM or FCV 1200L equipped with EXIF Assy 4 Navigator may be connected to interface unit or monitor unit CONTROL UNIT CV 1201 Landscape type CV 1202 Portrait type High Frequency Low Frequency Transducer 1 Transducer 1 Water Temp Sensor T 02MSB etc Net Sonde FNZ 18 Interface Unit IF 8000 External Monitor E S Interface VI 1100A E S Interface VI 1100A Sonar Net Recorder Telesounder TS 50 80 ...

Страница 5: ...203M FCV 1200LM Navigator HI LO Option Standard Local Supply 1 FCV 1200L only 2 EXIF Assy required for FCV 1200L 3 For sister ship one unit only Sister ship EXIF Assy required for FCV 1200L Master ship FCV 1200LM or FCV 1200L equipped with EXIF Assy 4 When connecting optional monitor unit connect it to control unit CONTROL UNIT CV 1201 Portrait type CV 1202 Landscape type MONITOR UNIT MU 101C NMEA...

Страница 6: ...sy 3 Navigator may be connected to either monitor unit or interface unit 4 Cable for monitor unit control unit Unibody MJ A10SPF0002 0015 Separate MJ A10SPF0002 0050 E S Interface VI 1100A HI LO E S Interface VI 1100A Sonar Net Recorder Telesounder TS 50 80 3 OR Transmitter Unit ETR 5D 10D Telesounder TS 7000 8000 3 Same as above OR SwitchBox EX 7 Picture Recorder MT 12 E S Interface VI 1100A OR T...

Страница 7: ... INTERNAL for low frequency 5 To display three division screen internal H internal L and either external H or L on USER 1 2 mode Select INTERNAL for both high and low frequency and connect external transceiver unit ETR to connector CN7 1 5 Connecting external monitor unit to EXIF Unit Echo signals of the internal transceiver unit are always outputted from the connectors CN7 and CN8 regardless of t...

Страница 8: ...a the MIF board in the IF 8000 to the external VGA monitor or standard LCD monitor MU 101C The EXIF unit interfaces the signals between external unit ETR TS VI 1100 EX 7 MT 12 and the MAIN board TX H TX L RX H RX L Key PNL 02P6275 or 02P6276 FIL 02P6274 Ship s Main Inverter Board LCD Unit R G B HS VS YC TRX TD CONTD PSW TD RD POWER 02P6270 NMEA DISP 06P0238 VTX H VTH L KP TX H KP TX L TRX SIG H TR...

Страница 9: ...rier signals LOCAL 2 H L Second local carrier signals VTX CONT H L Controls VTX H L voltage PD H L Reduces transmission power TRX ST 1 Status signal of frequency 15 200 kHz or 400 kHz TRX ST 2 Status signal of the ES board connection EXIF ST Status signal of the EXIF unit connection ETR SIG Echo signal output 8 bit binary code from EXIF unit to MAIN board ES SIG Echo signal from internal transceiv...

Страница 10: ...inputted from external transceiver unit KP OUT H L Trigger signal output for external transceiver unit TVG GAIN TVG and GAIN control voltage for external transceiver unit TD RD Communication I O signals to from NAVAID TRX TD Transmission data of CPU on MAIN board CONTD Transmission data of CPU on PNL board R G B Display signal Red Green Blue ...

Страница 11: ...Unit are also sent to the LCD Unit by the DISP board through the LCD Interface circuit The switching regulator of power circuit generates 5V and AD5V for internal digital circuit and 12V for the LCD inverter board The LCD unit consists of LCD module 10 4 inch screen TTF color LCD LCD control board and fluorescent lamp for back lighting The LCD inverter board generates AC pulse signal high voltage ...

Страница 12: ... by the CPU on the PNL board and sent to the CPU on the MAIN board in the transceiver unit through the serial data communication line 3 3 Processor Unit Figure 3 3 shows the system diagram of the Processor Unit Figure 3 3 System diagram of Processor Unit 02P6275 or 02P6276 FIL 02P6274 POWER 02P6270 ES 02P6271 CON 02P6262 EXIF 02P6278 02P6279 MAIN 02P6269 FAN FAN Ship s Main 12 24 VDC CN2 Transduce...

Страница 13: ...sducer POWER board 02P6270 Generates 5V 5V 5VA 12VA 12VPD VTX L and VTX H by switching regulator circuit FIL board 02P6274 Eliminates common mode noise on ship s main line CON board 02P6262 I O board for Net Sonde and Water Temperature Sensor EXIF board 02P6278 02P6269 Interfaces signals between external unit and processor unit 3 3 1 PWR Board 02P6270 Figure 3 4 shows the block diagram of the PWR ...

Страница 14: ...11 Figure 3 4 Block diagram of PWR board 02P6270 ...

Страница 15: ... kW TX0 L TX1 L TX0 H TX1 H TP50 TP49 TP6 TP5 TP48 TP47 TP4 TP1 DIODE TRAP DIODE TRAP LPF Filter Q9 Q16 Q1 Q8 TX AMP TX AMP VTX H VTX L CR29 CR16 1 3 J4 1 3 J3 U29 U1 TP36 TP37 TP19 TP9 TP42 TP43 TP27 TP28 TP34 TP35 TP8 TP18 TP41 TP26 TP40 TP33 TP16 TP17 TP31 TP32 TP14 TP15 TP30 TP39 TP13 TP12 1st LOCAL H H 1st LOCAL L H TVG H TVG L 2nd LOCAL H H 2nd LOCAL L H V REF V REF TRX SIG H H TRX SIG H C T...

Страница 16: ...sed by U9 U10 U11 U15 In the switching circuit the received signals digital and log signals from the internal transceiver unit or the external transceiver unit are switched according to the display mode selection and then selected signal is sent to the master and slave Gate Arrays U65 U66 The slave Gate Array U66 processes the signal L and then output it to the master Gate Array The master Gate Ar...

Страница 17: ...l external ETR KP Seleckt KPOM KPOS TP11 TP28 KPIM KPIS EKPO L1 EKPO H1 KPIM KPIS KP1 TP30 TP10 TP2 TP29 EKPO H EKPO L 5 6448MHz NMEA PNL CPU FNZ 18 TRXTVG H KP2 TRXTVG L KPSW L KPSW H TP6 CR3 TP35 CR16 ROM Liner to Log Converter Serial to Parallel Converter Detector U26 A D Converter Band Control TRX SIG L H TRX SIG H H TRX SIG L C TRX SIG H C U64 KPTX0 L KPTX1 L KPTX0 H KPTX1 H 1 2 1 2 J4 J5 4 4...

Страница 18: ...l into the processor circuit on the MAIN board Signal Output SIG OUT Only echo signals of the internal transceiver unit are outputted from SIG OUT terminal of the EXIF unit When external transceiver unit is selected on the menu the signal output is suspended KP Output Trigger signals corresponding to the selected unit in the menu are outputted from the KP OUT Buffer Buffer Filter Filter Mixer Mixe...

Страница 19: ...on the MAIN board to the CPU on the EXIF board and converted into the analog voltage by the D A converter The analog Gain and TVG voltage is supplied to the receiver amplifier in the ETR unit and control the amplitude Gain and TVG control voltage are outputted from the EXIF board The CPU on the EXIF1 board generates the Gain and TVG data to the D A converter in accordance with the GAIN TVG data se...

Страница 20: ...e of PLL circuit TP 7 12 V 12 0 V 0 2 V Source voltage of LCD inverter board TP 8 5 V 5 0 v 0 25 V 5 V for DISP board circuit TP10 GND 0 V TP11 GND 0 V TP12 FREQ 70 kHz 1 kHz Switching clock of power circuit Adjuster Adj Functions R65 Adjustsswitching frequency 70 kHz 1 kHz measuring at TP12 R75 Adjusts 12 voltage measuring at TP7 C63 Adjusts VCO control voltage measuring at TP4 TP 7 TP 8 TP 3 TP1...

Страница 21: ...rcuit TP7 VIN P0V Negative line of ship s main TP8 5V See Chapter 5 5 V output of transformer before rectified TP9 VTX H G See Chapter 5 Switching signal TP10 VIN P0V Negative line of ship s main TP11 TP12 TO VTX H See Chapter 5 VTX H output of transformer before rectified TP13 GND 0 voltage of switching regulator output circuit TP14 VTX L See Chapter 5 VTX L output of transformer before rectified...

Страница 22: ...D Color Name Functions CR10 GREEN VTX L ON when internal transceiver unit for high freq is selected CR19 GREEN 5V Always ON 5 V output CR20 RED OVER CUR Normally OFF over current indicator CR21 GREEN VTX L ON when internal transceiver unit for low freq is selected CR26 RED IN HL Normal OFF ON when abnormal ship s main is detected Adjuster Adj Name Functions R86 5V ADJ Adjust s 5V at test point TP2...

Страница 23: ...uction sets have pads for test pins but no test points on the ES board Figure 4 3 ES board 02P6271 RX Block 1 Figure 4 4 RX block 1 of ES board TP40 TP33 TP32 TP31 TP16 TP17 TP15 TP14 TP39 TP30 TP12 TP13 RX Block 1 RX Block 2 TX Block ...

Страница 24: ... TP31 1st RF H H TP40 1st RF H H RX Block 2 Figure 4 5 RX block 2 of ES board Test Point TP Name TP Name TP Name TP8 2nd RF L H TP27 2nd RF L H TP37 TRXSIG H C TP9 TRXSIG L C TP28 2ND RF L C TP41 2nd RF H TP18 2ND RF L C TP34 2nd RF H H TP42 2nd RF H H TP19 TRXSIG L H TP35 2nd RF H C TP43 2nd RF H C TP26 1ST RF L TP36 TRXSIG H H TP42 TP43 TP41 TP35 TP34 TP27 TP28 TP26 TP18 TP8 TP36 TP37 TP19 TP9 ...

Страница 25: ...L TP2 V REF TP3 5VA P TP4 TX0 L TP5 TX1 L TP6 TX0 L TP7 TVG L TP10 1 st LO L C TP11 1 st LO L H TP20 2 nd LO H H TP21 2 nd LO H C TP22 2 nd LO L H TP23 2 nd LO L C TP24 12VA P TP25 12VP TP29 5VA M TP44 1 st LO H C TP45 TVG H TP46 1 st LO H H TP47 TX1 H TP48 TX0 H TP49 TX1 H TP50 TX0 H LED LED Name CR16 VTX H CR29 VTX L Adjuster VR Name R50 R212 Jumper JP Name JP1 TRXST1 L JP2 TRXST2 L JP6 TRXST1 H...

Страница 26: ...H TP9 DDS2 SDATA Frequency data for DDS H TP10 KP2 Switching signal for DDS H High transmission carrier signal Low LOCAL 1 TP11 KPOM KP output H from Gate Array TP12 LOCAL1 H Local carrier signal H for mixer 1 of receiver circuit TP13 LOCAL 2 Local carrier signal for mixer 2 of receiver circuit 235 2 kHz TP14 GND 0 V TP15 76 3KHz Clocks TP16 TP15 TP13 TP14 TP19 TP20 TP21 TP2 CR2 TP5 TP4 TP6 CR3 TP...

Страница 27: ...utput L LED OFF ON Blink LED Name Color Functions CR2 EKPO H1 Yellow Blinks when external transceiver unit is selected for high frequency CR3 KPO H Yellow Blinks when internal transceiver unit is selected for high frequency CR11 KP IS Yellow Blinks when low frequency is selected by MODE key CR12 KP IM Yellow Blinks when high frequency is selected by MODE key CR15 EKPO L1 Yellow Blinks when externa...

Страница 28: ... 1 board 02P6278 Figure 4 9 Rear View of EXIF 1 board 02P6278 Test Point TP Name Remarks TP1 VREF L Reference voltage of A D converter L TP2 VREF H Reference voltage of A D converter H TP3 GND GND GAIN TVG H S1 R42 R41 R39 R38 R49 R47 TP1 TP2 CR5 TP3 CN7 CN8 GAIN TVG L ...

Страница 29: ...og linear Selects input signal L format either Log or linear 4 OFF linear A D H Log linear Selects input signal H format either Log or linear Note The Log position are used only when signals are exchanged between one and another FCV 1200L LED LED Name Function CR5 Time of 1sec Always blinks EXIF 2 Board 02P6279 Figure 4 10 Front View of EXIF 2 board 02P6279 Adjuster Adj Remark R2 Adjusts output si...

Страница 30: ... KP IN voltage is 12 V ON KP IN voltage is 5 V 8 OFF WL IN L OFF WL IN voltage is 12 V ON WL IN voltage is 5 V Dip switch Note L H input output signal to from terminal CN8 S2 Factory Setting Name Remarks 1 ON KPOUT H POS 2 OFF KPOUT H NEG Select polarity of KPOUT H signal 1 ON 2 OFF positive 1 OFF 2 ON negative 3 ON KP IN H POS 4 OFF KP IN H NEG Set ON OFF according to polarity of KP IN L inputted...

Страница 31: ...DC signal terminal CN8 8 7 ON and 8 OFF RECO L internal signal from ES board 7 OFF and 8 ON ETR REC L external signal from external transceiver unit Jumper Note L input output signal to from terminal CN7 H input output signal to from terminal CN8 JP Factory Setting Names Remarks J1 Put KPOUT L 12V J2 Remove KPOUT L 5V Select output voltage of KPOUT L JI 12 V J2 5 V J3 Put KP OUT H 12V J4 Remove KP...

Страница 32: ... menu in system menu 2 Adjust pot R11 so that the voltage at TP4 becomes 0 7Vpp Dipswitch S1 Factory Setting Setting 1 2 3 4 ON ON ON ON 1 Set all switches to ON when only external monitor unit is connected to IF 8000 2 Set all switches to OFF when external monitor unit and MU 101C are connected to IF 8000 Jumper JP Name Factory Setting Setting J6 1 2 3 VSYNC 1 to 2 Select buffer circuit for VSYNC...

Страница 33: ...30 5 WAVEFORM 5 1 MAIN Board 02P6270 TX0 TX1 TP1 ROMCS TP4 TX0 H TP6 KP0 H TP7 DDS2 SCLK TP5 TX1 H Note Phase difference between TX0 and TX1 5 V 5 V 5 V 5 V ...

Страница 34: ...31 TP8 22 5792 MHz TP9 DDS2 SDATA TP10 KP2 TP11 KPOM TP12 LOCAL 1 H TP13 DSP CLK TP15 76 3 kHz TP16 LOCAL 2 5 V 5 V 5 V 2 Vpp 4 Vpp 2 Vpp 5 V ...

Страница 35: ...32 TP17 WR1 TP18 CS0 TP19 WR0 TP20 RD TP21 KPIM TP22 KPIS TP23 LOCAL 1 L TP25 DDS1 SDATA 5 V 5 V 5 V 5 V 5 V 5 V 5 V ...

Страница 36: ...33 TP26 22 5792 MHz TP27 DDS1 SCLK TP28 KPOS TP30 KP1 TP31 TX0 L TP33 TX1 L 5 Vpp 5 V 5 V 5 V 5 V 5 V ...

Страница 37: ...34 5 2 POWER BOARD TP1 5 G TP2 TP3 12V TP4 5 V TP9 VTX HG TP12 TO VTX H TP14 VTX L TP16 P CLK TP18 VIN P0V 7 2 V 3 V 100 V ...

Страница 38: ...0 45 3 45F 12H 1400 1800 10 200 50 3 50F 12H 1400 1800 10 200 2 50B 12 1700 2200 10 200 1 50B 6 6B 900 1200 10 200 68 3 68F 30H 1400 1800 10 200 2 68F 30H 1100 1400 10 200 1 68F 8H 800 1000 10 200 88 3 88F 126H 1400 1800 10 200 2 88B 10 2300 2900 10 200 1 88B 8 1500 2100 10 200 107 3 100B 10R 1500 1800 10 200 150 3 150B 12H 1100 1400 10 200 200 3 200B 12H 1200 1600 10 200 2 200B 8B 1650 2150 10 20...

Страница 39: ...easure the transmission voltage with the transducer connected to original transmitter unit Note when measuring the transmission voltage use a 100 1 probe and connect it between G and A or G and B to prevent damaging a test probe see figure 6 3 Figure 6 3 Measuring point of transmission voltage Figure 6 4 shows the measuring point of the transmission wave XDCR SETTING INSTALLATION DEMO XDCR SELECT ...

Страница 40: ...o menu 5 Connect the transducer to the FCV 1200L and measure the transmission voltage 6 Re enter the Supply Voltage so that the transmission voltage becomes the same value as measured in step 2 Basically the transducer whose output power is over 3 kW and not listed on the XDCR TYPE menu is not allowed to connect to the FCV 1200L because of the maximum output power of internal transmission circuit ...

Страница 41: ...00 pF 200B 8B 5500 pF Note Capacitance including 10m cable 100pF m The magnetrostriction type of the transducer is driven by a coil winding a transducer therefore the conductance of coil may be checked by the multimeter The transducer type marked H has matching transformer inside for example 150B 12H Therefore it should be checked as magnetrostriction type even though it is electorstriction type 7...

Страница 42: ...0B 52 49 j53 106 50 kHz 3 kw 50F 24H 100 j0 100 7 3 Checking resonant frequency characteristic Procedure 1 using the impedance check circuit shown in figure 7 1 Make an impedance check circuit as shown in figure 7 1 and measure the resistance at various frequencies Plot the measured resistance vs frequency The typical curve is shown in figure 7 2 Figure 7 2 Resonant characteristic curve Frequency ...

Страница 43: ...nd the measuring condition i e in water or in air the resister and measuring condition must be the same when checking the transducer Note when check a transducer in water sufficient clearance below transducer is required Figure 7 4 on the next page shows the sample waveforms of the normal and defective transducer type 50B 12 measured in water depth is 2 m more or less The waveforms ringed in figur...

Страница 44: ...r depth is 2 m more or less and the waveforms shown in left side are measured in air As mentioned above the waveforms are differ with the measuring condition therefore the recommendable way to check the transducer is to compare the waveforms between normal and doubtful transducers by the same test instruments and measuring conditions at once Normal Transducer Defective Transducer Example 1 Defecti...

Страница 45: ... Vs 20Vpp Ro 1k ohm Sweep freq 2 to 25 kHz 1 msec div 0 2V div 28F 18 Vs 15Vpp Ro 1k ohm Sweep freq 10 to 40 kHz 1 msec div 0 2V div 28F 18 Vs 15Vpp Ro 1k ohm Sweep freq 10 to 40 kHz msec div 0 2V div1 28F 24H Vs 15Vpp Ro 1k ohm Sweep freq 10 to 40 kHz 1 msec div 0 5V div 28F 24H Vs 15Vpp Ro 1k ohm Sweep freq 20 to 35 kHz 1 msec div 1V div ...

Страница 46: ... freq 10 to 80 kHz 1 msec div 1 0 V div 50B 9B Vs 15Vpp Ro 1k ohm Sweep freq 20 to 80 kHz 1 msec div 1 0 V div 50B 9B Vs 15Vpp Ro 1k ohm Sweep freq 20 to 80 kHz 1 msec div 1 0 V div 50B 12 Vs 15Vpp Ro 1k ohm Sweep freq 20 to 80 kHz 1 msec div 2 0 V div 50B 12 Vs 15Vpp Ro 1k ohm Sweep freq 20 to 80 kHz 1 msec div 2 0 V div ...

Страница 47: ...10 to 80 kHz 1 msec div 2 0 V div 45F 3H Vs 15Vpp Ro 1k ohm Sweep freq 20 to 65kHz 1 msec div 0 5 V div 45F 3H Vs 15Vpp Ro 1k ohm Sweep freq 20 to 65 kHz 1 msec div 1 0 V div 45F 6H Vs 15Vpp Ro 1k ohm Sweep freq 20 to 65kHz 1 msec div 1 0 V div 45F 6H Vs 15Vpp Ro 1k ohm Sweep freq 20 to 65kHz 1 msec div 1 0 V div ...

Страница 48: ...ep freq 60 to 75kHz 1 msec div 0 5 V div 68F 30H Vs 15Vpp Ro 1k ohm Sweep freq 50 to 75kHz 1 msec div 0 5 V div 68F 30H Vs 15Vpp Ro 1k ohm Sweep freq 50 to 75kHz 1 msec div 0 5 V div 88B 8 Vs 15Vpp Ro 1k ohm Sweep freq 80 to 110kH 1 msec div 0 5 V div 88B 8 Vs 15Vpp Ro 1k ohm Sweep freq 80 to 110kH 1 msec div 0 5 V div ...

Страница 49: ...freq 24 to 160kH 1 msec div 2 0 V div 88F 126H Vs 15Vpp Ro 1k ohm Sweep freq 30 to 160kH 1 msec div 1 0 V div 88F 126H Vs 15Vpp Ro 1k ohm Sweep freq 30 to 160kH 1 msec div 1 0 V div 100B 10R Vs 15Vpp Ro 1k ohm Sweep freq 4 to 200kH 1 msec div 2 0 V div 100B 10R Vs 15Vpp Ro 1k ohm Sweep freq 4 to 200kH 1 msec div 2 0 V div ...

Страница 50: ...Sweep freq 50 to 200kH 1 msec div 2 0 V div 200B 5S Vs 15Vpp Ro 1k ohm Sweep freq 4 to 400kH 1 msec div 1 0 V div 200B 5S Vs 15Vpp Ro 1k ohm Sweep freq 4 to 400kH 1 msec div 1 0 V div 200B 8 Vs 15Vpp Ro 1k ohm Sweep freq 4 to 300kH 1 msec div 1 0 V div 200B 8 Vs 15Vpp Ro 1k ohm Sweep freq 4 to 300kH 1 msec div 1 0 V div ...

Страница 51: ... freq 1 msec div 0 5 V div 200B 8N Vs 15Vpp Ro 1k ohm Sweep freq 100 to 300kH 1 msec div 1 0 V div 200B 8N Vs 15Vpp Ro 1k ohm Sweep freq 100 to 300kH 1 msec div 1 0 V div 200B 12H Vs 15Vpp Ro 1k ohm Sweep freq 4 to 400kH 1 msec div 2 0 V div 200B 12H Vs 15Vpp Ro 1k ohm Sweep freq 4 to 400kH 1 msec div 2 0 V div ...

Страница 52: ...MS DOS prompt screen appears on PC 7 Turn on the FCV 1200L when TARGET power on comes on the PC screen 8 Loading starts automatically The PC screen shows the progresses of updating 9 When loading of new software is completed Finish version up ted appears on the PC screen while the FCV 1200L shows normal picture 10 Turn off the PC 11 Turn off and on the FCV 1200L Using program card PC board 1 Inser...

Страница 53: ...00 2 Make sure that all bits of S1 on the MIF board in the IF 8000 must be turned off when VGA monitor and the standard monitor MU 101C are connected to the IF 8000 3 If switch setting does not cure the problem a Make sure that the cable between the IF 8000 and the VGA monitor is not too long using a shorter cable b Adjust R9 R10 and R11 on the MIF board for signal level of 0 7 Vpp observing TP4 T...

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