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Furuno FS-1503, Service Manual

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Furuno FS-1503 Service Manual Download Page 38

2-31

Matching Flow Chart

Start

Detector ON

Vf  Read

SWR Calculation

Freq. Read

Matching operation

Detector OFF

Sleep mode

SWR  
Calculation

Keeping relays off

Outputting TUNE END

Bypass

Keeping relays on

Outputting TUNE END 
and TUNE ERROR

Vf > Data obtained

SWR < 1.5

SWR < 1.5

DATA  
Retrieve

RAM DATA in 
us ?

YES

YES

YES

NO

NO

NO

K1, K2 

(Freq./VSWR/Phase detection)

Checking RF Input

Checking RF Input Frequency

"H" BUSY

See next page.

K3 to K12 ON

"L" BUSY

YES

NO

Figure 2-26    Matching Flow Chart

Summary of Contents for FS-1503

Page 1: ...SSB RADIOTELEPHONE MODEL FS 1503...

Page 2: ...a l e r FURUNO ELECTRIC CO LTD c 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 6 6 2 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 A l l r i g h t s r e s e r v e...

Page 3: ...nging System Settings 4 2 4 2 System Channels List 4 3 4 3 Channel Programming 4 8 4 4 Power Data Setting 4 13 4 5 BC Band Filter Setting 4 18 4 6 Setting for NBDP DP 6 4 19 Chapter 5 Maintenance 5 1...

Page 4: ...VAC 24 VDC DSC 6 DSC Terminal NBDP MF HF RT DP 6 NBDP Terminal MF HF RT DSC COUPLER REMOTE CONTROL 13 6 VDC MIC 30 A DSC MF HF RT AA 50 MF HF WR Rem 1 Rem 2 Rem 3 Rem 4 Rem 5 MIC HANDSET SP MF HF RT o...

Page 5: ...o 000050903 FS 1503 04 The table below lists the complete set Standard Supply Name Type Q ty Code No Remarks SSB Transceiver FS 1503 1 000050905 Antenna coupler AT 1503 1 000050904 CP05 07600 1 000050...

Page 6: ...lt 0P05 12 1 005923680 For fixing antenna 05S0949 0 L 20M 1 000130485 05S0949 0 L 30M 1 000130486 05S0949 0 L 40M 1 000130487 Cable Assy 05S0949 0 L 50M 1 000130488 Control Cable between main unit and...

Page 7: ...ode No Remarks E 22 1 000050632 Doublet Antenna Kit E 24 1 000050634 Single Wire Antenna Kit E 25 1 000050635 Doublet span Antenna Kit E 26 1 000050636 Whip Antenna Lead in Kit Antenna materials E 27...

Page 8: ...ng time and thus enables telex communication It has a built in two tone alarm and is powered by a 13 6 V supply The transmitter works in 1 6 MHz to 23 0 MHz 150 Wpep and in 23 0 MHz to 27 5 MHz 75 Wpe...

Page 9: ...RX OUT PA ON TEMP ALC RF BK ON CLK ST DATA 12 V ANT 13 6 V 13 0 V 13 6 V 30 A 12 V TUNE BUSY THROU DUMMY 12 V CHK EXC DDS DATA CLK RX MUTE TX KEY TXD RXD TX KEYED PTT T R MUTE SQ SIG S TONE EXC ON PA...

Page 10: ...line relay and a protection circuit against over voltage and over current The PA section in cludes a transmitting high frequency power amplifier circuit and a tempera ture detecting circuit The TX FI...

Page 11: ...TX 3rd mod RX 1st conv TX signal 3Lo 2Lo 1Lo 1 5 455 456 5 54000 54455 F F 1 5 F 54456 5 RX signal 3Lo 2Lo 1Lo kHz kHz J3E TX J3E RX 1 5 455 456 5 54000 54455 F F 1 5 F 54456 5 TX signal 3Lo 2Lo 1Lo 1...

Page 12: ...d RX 2nd conv TX 3rd mod RX 1st conv TX signal 3Lo 2Lo 1Lo 1 7 455 456 7 54000 54455 F F 54455 RX signal 3Lo 2Lo 1Lo kHz kHz J2B RX J2B TX Y B 1700 85 Hz Y B Y B Y B Y B Y B Y B Y B Y B Y B Y B 1 9 45...

Page 13: ...bit single chip microcomputer with integrated peripheral functions such as RAM ROM timer serial I O A D converter and I O ports The system program ITU frequency table system settings initial values of...

Page 14: ...gister strobe signal P45 OUT ST SYN SYN shift register strobe signal P46 OUT ST TX RX TX RX shift register strobe signal P47 OUT ST PA FIL TX FIL shift register strobe signal P17 OUT TUNE Ant Coupler...

Page 15: ...erminal P10 IN UP Freq channel up signal P11 IN DOWN Freq channel down signal P50 OUT D0 LCD data key scan P51 OUT D1 LCD data key scan P52 OUT D2 LCD data key scan P53 OUT D3 LCD data key scan P54 OU...

Page 16: ...FIL N FIL M Q1 2 3 4 5 6 7 8 LPF 6 LPF 5 LPF 4 LPF 3 LPF 2 LPF 1 Q1 2 3 4 5 6 7 8 BAMD 1 BAND 2 BAND 3 BAND 4 H L DDS RESET DDS U503 U502 U504 3Lo 1Lo 1Lo U501 U11 M54972FP U12 M54972FP U501 AD7008AP...

Page 17: ...M54972P consists of 8 D flip flops and 8 latches connected to the outputs of the flip flops Serial data signals input to the serial data input S in and clock pulses input to the clock input T Every ti...

Page 18: ...0 0 0 1 1 0 0 0 0 1 OFF 1 0 0 0 1 0 1 1 1 0 1 0 1 1 0 ON 1 0 0 0 1 0 1 1 1 0 1 0 1 1 0 ON 1 0 0 1 1 0 1 1 1 1 1 0 1 1 0 ON 1 0 0 0 1 0 1 1 1 0 0 1 0 1 0 ON 1 0 0 0 1 0 1 1 1 0 0 1 0 1 0 ON 1 0 0 1 1 0...

Page 19: ...ist Status IC OUT BIT Functions TX RX Q8 7 LPF1 0 1 to 2 4 MHz L Q7 6 LPF2 2 4 to 3 6 MHz L Q6 5 LPF3 3 6 to 6 0 MHz L Q5 4 LPF4 6 0 to 10 0 MHz L Q4 3 LPF5 10 0 to 18 0 MHz L Q3 2 LPF6 18 0 to 30 0 M...

Page 20: ...F 54 455 MHz 1 5 kHz 2Lo 54 MHz 3Lo 456 5 kHz T RX Fo 1 5 kHz AF 1 5 kHz 54 455 MHz 455 kHz DDS PLL 1 1 2 PLL 3 1 100 36MHz Ref OSC 1 Lo 2 Lo 3 Lo Ref Figure 2 6 Frequency Conversion Table 2 5 Freque...

Page 21: ...receives Unlock Signal from PLL IC U502 or U504 TX and RX are disabled and frequency indication blinks Phase Accumulator ROM Look up Table D A FIL Ref CLK Freq Select Data OUTPUT Simplified DDS Block...

Page 22: ...t frequency of DDS and the oscillating frequency of PLL is as follows DDS output frequency fo K fc 2N where fc is DDS clock frequency 18 MHz the reference frequency 36 MHz is divided into 1 2 N is DDS...

Page 23: ...99999 MHz 57 45500 to 60 45499 MHz 2 L 6 0 to 9 49999 MHz 60 45500 to 63 95499 MHz 2 H 9 5 to 13 49999 MHz 63 95500 to 67 95499 MHz 3 L 13 5 to 17 49999 MHz 67 95500 to 71 95499 MHz 3 H 17 5 to 21 499...

Page 24: ...he output signal from FL2 2 4 kHz through R101 H3E CARR LIM CR27 30 FL2 2 4 k FL3 FL4 6 0 k 0 4 k MIC LINE TONE MIC ON MIC TONE TP6 U5 2 2 R156 INTERCOM 6 dB H3E 3Lo 456 5 kHz CR22 Q16 U14 COMP TX TP5...

Page 25: ...f checked in a condition 3 MHz J2B 1700 Hz tone signal and a power data of 255 Reference When a transmitting power is 140 W to 150 W CHK EXC level is 2 4 to 2 6 V PA FIL section The transmitting outpu...

Page 26: ...uency L P F K10 K4 L P F K11 K5 L P F K12 K6 L P F K13 K7 L P F K14 K8 L P F K15 K9 B1 0 1 to 2 4 MHz B2 2 4 to 3 6 MHz B3 3 6 to 6 0 MHz B4 6 0 to 10 0 MHz B5 10 0 to 18 0 MHz B6 18 0 to 30 0 MHz Vf...

Page 27: ...2 20 ALC ALC REF POWER DATA EXC OUT Q26 25 ALC Circuit U6 ALC U7 8 TX RX Board Figure 2 13 ALC Signal...

Page 28: ...to NB J3E The receiving signal F 1 5 kHz from PA FIL board is passed through a 30 MHz L P F and amplified G G grounding amplification by Q1 2 The gain is about 10 dB This signal is passed through 30 M...

Page 29: ...curs Changing the value of a resistor R35 can adjust the noise detection level of the NB In receiving TLX the NB is not operated because it cuts top portions of the signal pulses Note The transmitting...

Page 30: ...ed by CR18 and CR19 C77 R60 and R62 determine the AGC time constant C77 and R60 determines the AGC attack time to be about 10 msec R61 and R62 deter mines AGC decay time in AGC FAST to be about 100 ms...

Page 31: ...ses the signal for an adequate curve to control the AGC circuit RF gain can be changed by MIF command RF xx output from an external unit Rotating RF GAIN volume cancels the MIF command TX RX Section A...

Page 32: ...INE OUT 1 2 13 U19 C140 INTERCOM C141 U13 2 2 8 9 6 U21 SP OFF PHONE SP EXT SP AF VR TONE TX TONE TX AF LINE LINE IN U20 11 10 12 U19 11 10 12 LINE ON C142 Q32 U19 9 6 8 MIC TONE LINE IN U19 5 MIC ON...

Page 33: ...TX RX PCB SW REG OPTION J1 J3 J4 J2 12 V J7 12 V J1 POWER ON 13 6 V R12 C9 Figure 2 20 Power Supply Circuit The allowable input voltage of power supply is from about 8 V to 17 V Rating volt age 13 6...

Page 34: ...2 V 3 0 V GND 4 0 V GND J1 1 12 V 2 12V 3 0 V GND 4 0 V GND J7 1 12 V 2 12 V 3 0 V GND 4 0 V GND 5 0 V GND PA FIL Board SW REG Board J2 J3 J1 J2 Figure 2 21 Connection of SW REG Board The block diagra...

Page 35: ...turns ON relays K3 to K12 that bypass the matching coils thus prevent ing the coils to be burnt out An optional dummy antenna 10 250 pF 100 W can be built in for the purpose of maintenance work AT 15...

Page 36: ...rcuit and changes the constants of L C in L type matching circuit 5 If SWR is less than 1 5 the matching data is stored in the internal RAM of U8 If SWR is more than 2 0 or it takes longer than 15 sec...

Page 37: ...is about 80 pF in 1 6 MHz In this case LI is 120 H that is too high Adding Cs 50 pF increases the equivalent value of Ca to about 130 pF and leads to the necessary value of LI 75 H that is within a m...

Page 38: ...eping relays off Outputting TUNE END Bypass Keeping relays on Outputting TUNE END and TUNE ERROR Vf Data obtained SWR 1 5 SWR 1 5 DATA Retrieve RAM DATA in us YES YES YES NO NO NO K1 K2 Freq VSWR Phas...

Page 39: ...OFF See note 1 See note 2 Changing L for minimum Vr Changing C for minimum Vr NO NO YES DATA Memory Note 1 Inductive tuning At first a dip point of the reflection voltage Vr is sought by varying the...

Page 40: ...eceiving in scanning and sweeping modes 4 Receiving frequency is less than 1605 kHz 1 always sets to through THRU always Table 2 7 Through Operation System Setting 9921 Condition THROU Signal Remarks...

Page 41: ...0 is applicable to both types with modifications in the REMOTE boards Level Converter IC U4 MC145406AP LINE IN LINE OUT RX MUTE TX KEY TXD RXD U5 PC357NT U5 PC357NT TX RX AF Circuit CPU Board REMOTE A...

Page 42: ...x Rx 4 Remote B DSC 5 Distress Frequency Tabile 3 Enter a command and a parameter For example type FT1234560 and press Enter to set TX freq to 12345 60 KHz 4 If the entered command is executed appears...

Page 43: ...setting FF RF GAIN MAX to 00 RF GAIN MIN SQS Squelch on setting SQR Squelch off setting SCS start scanning SCR stop scanning PO TX power setting 0 1 2 LOW 3 HIGH TU TUNE OK TUNE ERROR Tuning IC S Inte...

Page 44: ...e is 1A U3 PC357NT RX MUTE CONTROL 05P0459 CPU Board Receiver CONTROL 1 GND 2 NC 3 TX KEYED 4 RX MUTE 5 BK 12V 6 BK 12V 7 NC BK 12 V 24 V CR1 Q3 2SD799 V06C TX KEYED 5 V U5 PC357NT RX MUTE TX KEYED L1...

Page 45: ...Main Unit 1 FS 1503 Front Panel Internal Speaker MIC HANDSET FREQ CH RF GAIN Power SW AF GAIN LCD 2 FS 1503 Rear Panel 13 6 VDC SPKR REMOTE OPTION CONTROL OPTION COUPLER ANT GND Chapter 3 Location of...

Page 46: ...rd Q25 2SC3133 FL 3 0 4 kHz Option C554 Freq ADJ 30 A 2 13 6 V VCO DDS FAN Y501 REF X tal 36 MHz R101 H3E CARR R156 TX GAIN CONTROL 05P0459 OPTION A 05P0457 RS 232C B 05P0458 Current Loop REMOTE OPTIO...

Page 47: ...9 PA BIAS DRIVE 2SC3133 PA 2SC3240 R15 13 V ADJ J9 BC BAND FIL Note 2 J8 SW REG 05P0668 OPTION Note 2 BC BAND FIL Setting J9 8 1 6 to 30 0 MHz J8 9 0 1 to 30 0 MHz Default Note 1 TX FIL ranges B1 0 1...

Page 48: ...3 4 5 CPU Board 05P0665 SP 8 0 3 W U5 X24C16S EEROM CR1 CPU RUN U2 HD61602 LCD CONT U6 HD6475328 CPU R1 LCD Bril Adj...

Page 49: ...3 2 AT 1503 1 AT 1503 05P0669 Standard type S1 TUNE TB 2 GND F1 1 35 A Switch TX IN RX OUT ANT R2 BAL ADJ or ADJ U8 HD63B01Y0E76P CPU J1 SELF TEST TUNE Built in dummy type optional DUMMY 05P0670 OPTI...

Page 50: ...3 6 3 3 Power Supply Unit 1 PR 200 635S1002 Front Right hand Side View FAN Front Top View 635S1001 Front R6 13 6 V AVR ADJ R24 32 V Short circuit Left hand Side View...

Page 51: ...3 7 2 PR 270 Front Right hand Side View Front Change tap connection according to ship s mains 0 110 120 V R5 13 6 V AVR ADJ 635S1001 635S1002 Top View Front Left hand Side View...

Page 52: ...ing up procedure of the FS 1503 System Channel 9998 Setting Select 0 or 1 Changing System Settings Power ON Registering User Channel 0 01 to 99channel 1 00 to 99channel TX RX Frequencies Adjusting TX...

Page 53: ...Preset value 2 Select the system channel 9999 by rotating the FREQ CH knob 3 Enter a password Press CH type password and then press ENT 4 Select a channel to be changed its setting by rotating the FRE...

Page 54: ...AX Weather Facsimile Usage TX RX RX Disable 1 1 2 9917 2 tone TX Test TX 2 tone Enable Test Disable Both Enable Both Disable 0 0 0 9918 Test Alarm TX Frequency 1605 00 to 29999 9 kHz 2191 kHz 9919 Squ...

Page 55: ...ROM User channel only 3 Marine Free Frequencies can be selected in the following range ITU and User channels are also available 1606 5 4438 6200 6525 8100 8815 12230 13200 16360 17410 18780 19800 2200...

Page 56: ...y momentarily 7 9909 TLX RX Bandwidth 1 Narrow 0 4 kHz requires an optional filter SF0L04 8 9910 TLX System Delay Set to 10 msec normally 9 9912 2182 kHz Class of Emission Selects class of emission fo...

Page 57: ...ed when Furuno DSC or NBDP terminal is connected 1 TBUS For equipment made by Thrane Thrane A S of Denmark 16 9951 Scan Stop Signal Level 0 SQ Level Scan stops when the squelch opens 1 to 9 Scan stops...

Page 58: ...RX Enabling to write TX and RX frequencies on user channels 2 RX Enabling to write RX frequencies on user channel 3 Disable Disabling to write frequencies and adjust TX power on user channel 20 9999 P...

Page 59: ...1 While pressing and holding down CH turn the power on 2 Select system channel 9999 by rotating the FREQ CH knob 3 Enter a password Press CH type password and then press ENT 4 Select channel 9998 by r...

Page 60: ...play will appear 0 01 MEMO Channel Number Channel Name 12 Press CH and select a desired number or alphabet by rotating the FREQ CH knob And then press ENT 13 Rotate the FREQ CH knob to select a desire...

Page 61: ...time On system channel 9901 press CH 1 and ENT in this order How to erase channel name 1 Select a channel name to be erased Carry out steps 1 to 5 on page 4 8 and select the channel name by rotating...

Page 62: ...symbols and their corresponding letter are shown below A B C D E F G H I J K L M N O P Q R S T U V X Y Z 0 1 2 3 4 5 6 7 8 9 W Note To indicate the channel name system channel 9906 must be set to 0 C...

Page 63: ...for each user channel and 2182 kHz is set individually Where manually entered frequency or ITU channel is permitted the data is set on each band and each class of emission J3E power data is also used...

Page 64: ...0 3 4999 3 5 3 9999 4 0 5 9999 6 0 7 9999 8 0 11 9999 12 0 15 9999 16 0 17 9999 18 0 21 9999 22 0 24 9999 25 0 29 9999 ITU Channel Using above data for each frequency range and in each emission modes...

Page 65: ...T appears during TX 0 2 4 6 8 10 During TX RF output level can be read NB TR 4 Set power data by rotating the FREQ CH knob The data can be set to from low power data plus 1 to 255 Read the power meter...

Page 66: ...ss 9 and LOW power data appears 4001 140 J3E ITU Channel Number LOW Power Data ITU R AGC DUP T appears during TX 0 2 4 6 8 10 During TX RF output level can be read LOW 4 Set power data by rotating the...

Page 67: ...ess TUNE 7 TUNE appears on the display and the coupler starts tuning When the tuning is completed successfully TUNE OK appears 3 While pressing and holding down ENT press TUNE 7 and TUNE power data ap...

Page 68: ...to 1 Position 1 Receiving frequency range from 1 6 MHz to 30 MHz Position 2 Receiving frequency range from 0 1 MHz to 30 MHz PA FIL Board J8 J9 0 1 to 30 MHz 1 6 to 30 MHz SW REG Board OPTION 2 1 2 1...

Page 69: ...30 10 dBm MIF Tune OFF ON Freeze OFF ON AGC OFF ON Emission OFF ON TX RX MSG Save OFF ON Edit Before Sending OFF ON Timer System OFF UTC STM JST Time Date Display Mode Normal Reverse Self Test Slave D...

Page 70: ...ent DANGER 5 1 Periodical Checks Regular maintenance is important for good performance Before performing any mainte nance turn off the power 1 Cleaning of the display Use a soft cloth with a slight am...

Page 71: ...e the hand from TX when all indications appear on the screen The test com mences and the display changes as follows R Good T Good E T Good P T Good P Note If an error is detected no Good appears Recei...

Page 72: ...holding down TX 13 5 MHz produced from 2LO is input to antenna Mode TLX AGC ON RF GAIN automatically set to Max U22 ON TX RX PCB ON J6 6 on TX RX PCB YES NO NO YES 0 8 V RF OUT 20W 2 4 V 140W 3 MHz T...

Page 73: ...Self Test completed NO YES SET j TLX Tone F 1700Hz Freq 3MHz Dummy ON Tune power data F 35 TLX Tone 1700 Hz Freq 3 MHz Dummy ON Tune power data 35 Reset to 3 MHz TLX POWER DATA 35 RF 5 RF OUT of 30 W...

Page 74: ...3 2 SCAN 6 6 A ALM E TX 3 RX 7 CH b ENT F 4 9 4 Turn off the power after the test Antenna Coupler Check 1 Remove the antenna coupler cover and shield cover inside 2 Change the jumper J1 to SELF TEST...

Page 75: ...mal 1 Loose connection on PCB Defective flat cable on CPU board Check connections Replace CPU board 1 Specific key does not work Carry out self test 6 No key response 2 All keys do not work CR1 on CPU...

Page 76: ...heck antenna Replace COUP board 2 2 If sensitivity is low on all bands check main unit with antenna coupler discon nected If main unit is NG RX RF circuit is defective Replace TX RX board 2 3 If sensi...

Page 77: ...r for enough warm up time 1 Turn on the FS 1503 and leave it for more than 3 minutes 2 Connect a frequency counter to 2 nd Local oscillator output TP3 H and TP4 C on the TX RX board 3 The reading must...

Page 78: ...tput level so that the ratio between AF output and noise output is 20 dB The output should be less than 3 dB V With a 8 ohm speaker connected the S N is 20 dB when AF noise output is 200 mVrms and AF...

Page 79: ...a connection as below 50 Pwr meter 50 ANT 50 Coax FS 1503 AF OSC MIC H C 13 6 V AF OSC ATT 200 200 200 600 6 dBm 600 6 dBm 600 46 dBm 3 4 1 2 PTT SW GND PTT oscilloscope Figure 5 4 Measurement of TX o...

Page 80: ...onnector 2 Make a open circuit on FL3 and connect a DC current meter 3 While pressing the PTT switch down adjust R39 PA BIAS so that the meter reads 450 to 550 mA SW REG PA FIL Board 05P0667 Front Pan...

Page 81: ...it at least 3 minutes to allow residual charge to subside before acceessing the inside of the equipment DANGER 1 Adjustment Table 5 2 Adjustment 1 2 Board Item Setting Adjuster Check Point Level Remar...

Page 82: ...N 1 to 5 dB V SSG Level AF output of 1 W NB Function External pulse noise mixed CR11 12 A GND Negative pulse LINE OUT Level RX SIG 4 MHz TLX RF GAIN MAX AGC ON REMOTE Connector 10 H 11 C 3 to 9 dBm 60...

Page 83: ...side before acceessing the inside of the equipment DANGER 2 Measurement Setting Details A MIC IN 40 dBm 1500 Hz 600 4 MHz J3E Power Data 220 B PTT ON No AF signal C Receiving mode D SSG 100 dB V 50 4M...

Page 84: ...MIC Input OSC Circuit TP1 TP2 C 0 8 Vp p 1 Lo Fo 54 455 MHz TP3 TP4 C 1 1 Vp p 2 Lo 54 MHz TP7 TP6 C 1 0 Vp p 3 Lo 456 5 kHz RX Circuit Q1 2 D GND 1 2 Vp p RX RF FET 2SK937 S GND D 0 11 Vp p Q1 2 D G...

Page 85: ...5 16 5 7 Location of Parts 1 CPU Board 05P0665...

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Page 89: ...5 20 5 DUMMY CONT Board 05P0670 Optional 6 SW REG Board 05P068 Optional...

Page 90: ...AP1 1...

Page 91: ...AP1 2...

Page 92: ...AP1 3...

Page 93: ...AP2 1...

Page 94: ...AP2 2...

Page 95: ...AP2 3...

Page 96: ...AP2 4...

Page 97: ...AP2 5...

Page 98: ...AP2 6...

Page 99: ...AP2 7...

Page 100: ...AP2 8...

Page 101: ...AP2 9...

Page 102: ...AP2 10...

Page 103: ...AP2 11...

Page 104: ...AP2 12...

Page 105: ...AP2 13...

Page 106: ...AP2 14...

Page 107: ...AP2 15...

Page 108: ...AP2 16...

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Page 115: ...CPU 05P0665 C5614 K07 S 7 050666 1 2 C5614 K04 S 8 TX RX 05P0666 2 2 C5614 K05 S 9 NB DET 05P0466 C5548 K12 S 10 CONTROL 05P0459 C5548 K11 S 11 REMOTE A 05P0457 C5548 K08 S 12 REMOTE B 05P0458 C5548 K...

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Page 134: ...of T2 as shown in Figs 1 and 2 If C27 is already fitted change it to 330 pF The PA transistor 2SC2879A does not require an insulator Related Furuno Information FQ5 2004 036 Fig 1 C27 330 pF on 05P066...

Page 135: ...board 05P0667A Fig 6 CPU board 05P0665A and PANEL board 05P0664A Fig 5 TX RX board 05P0666B C PANEL board No shield cover CPU board New TX RX board has no shield cover for PLL circuit 3 3 PA Transist...

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