Furuno FS-1503 Service Manual
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Furuno FS-1503 Service Manual

Ssb radiotelephone
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See also: Operator's Manual , Installation Manual
SSB RADIOTELEPHONE
FS-1503
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Summary of Contents for Furuno FS-1503

  • Page 1 SSB RADIOTELEPHONE FS-1503 MODEL...
  • Page 2 FURUNO E L E C T R I C C O., LT D. Yo u r L o c a l A g e n t / D e a l e r 9 - 5 2 , A s h i h a r a - c h o ,...

  • Page 3: Table Of Contents

    Table of Contents Chapter 1 Configuration 1.1 configuration ............1-1 Chapter 2 Circuit Description 2.1 General..............2-1 2.2 CPU................ 2-6 2.3 Oscillator..............2-13 2.4 TX/RX circuit............2-17 2.5 Receiver Circuit............2-21 2.6 Power Supply SW Circuit........2-26 2.7 SW REG Board (option)......... 2-27 2.8 ANT COUP (Antenna Coupler)......

  • Page 4: Configuration

    Chapter 1 Configuration 1.1 Configuration The basic FS-1503 consists of a transceiver unit (main unit) and antenna coupler (AT- 1503), and covers the frequency range 1.6 to 27.5 MHz. AT-1503 (Antenna coupler) COUPLER 100/110 13.6 VDC 200/220 VAC PR-270 (AC Rec.)
  • Page 5 1. FS-1503 Standard Supply There are four models depending on the selection of an antenna coupler and a handset. Specification Code No. Model Antenna Coupler Handset 000050900 FS-1503-01 000050901 FS-1503-02 000050902 FS-1503-03 000050903 FS-1503-04 The table below lists the complete set.
  • Page 6 2. FS-1503 Optional Supply Optional Supply Name Type Q'Ty Code No. Remarks AC Power Supply PR-270 000113349 DC Power Supply PC-220 000113350 Loudspeaker MX910-X01 000138001 REMOTE A Kit 0P05-82 005939810 05P0457 (RS-232C) REMOTE B Kit 0P05-83 005939820 05P0458 (Current Loop)
  • Page 7 Optional Supply Name Type Q'ty Code No. Remarks E-22 000050632 Doublet Antenna Kit E-24 000050634 Single Wire Antenna Kit E-25 000050635 Doublet-span Antenna Kit Antenna materials E-26 000050636 Whip Antenna Lead-in Kit E-27 000050637 Whip Antenna Feeder Kit...

  • Page 8: Chapter 2 Circuit Description 2.1 General

    Chapter 2 Circuit Description 2.1 General The SSB transmitter/receiver (FS-1503) has been developed as an upgraded successor model of FS-1550 and FS-1502, which is used for pleasure boats and fishing boats. The specifications conform to the FCC regulations and the inspection standards of such countries as New Zealand, Australia, Russia, China, and southeastern Asian countries.
  • Page 9 · DUMMY CONT (05P0670) Ω · DUMMY (10 + 250 pF) CONT AT-1503 FS-1503 TUNE, BUSY, THROU DUMMY, 12 V CPU (05P0665) FREQ/CH (CPU/LCD/KEY) CHK EXC, DDS DATA/CLK, RX, MUTE, TX KEY, TXD, RXD, TX KEYED PTT, T/R, MUTE, SQ SIG, S, TONE, EXC ON,...
  • Page 10 2. Function of PCB Table 2-1 Function of PCB Board Name Type Description Remarks FS-1503 Scans the key switches, outputs signals 05P0665 to the LCD-panel display, and controls each circuit block (input/output control). Comprises a modulator for microphone and LINE input signals, a transmitting...
  • Page 11 3. Spectrum...
  • Page 13 2.2 CPU 1. General CR1: Blinking LCD PANEL CPU: U6 U1: 05S0805 HD6475328F10 (H8/532one-time) Input/output control signal LCD DRIV Serial data HD6435328F DATA, CLK, ST, ENB U2: HD61602 (H8/532maskROM) (converted to parallel data on each PCB.) S, IA, RF, TEMP, CHK EXC KEY PAD Analog signal Detected...
  • Page 14 2. CPU Input/output Control Signals Table 2-2 CPU Function List U6: I/O Port IN/OUT Function (Signal name) Description TX/RX selection, TX: H MUTE MUTE ON: H EXC ON TX/RX Exciter ON/OFF, TX:H PA ON PA selection, TX: H TX KEYED BK output, TX: H BK ON ANT BK signal, TX: H...
  • Page 15 U6: I/O Port IN/OUT Function (Signal name) Description TX KEY Remote terminal TX signal, TX: L BUSY (TUNE OK) Busy signal from ant. coupler PTT signal, ON: L RX MUTE MUTE signal from CONTROL terminal UNLOCK PLL unlock, unlock: L SQ SIG Squelch ON/OFF signal DDS DATA...
  • Page 16 3. Control Signals There are two ways for the CPU to control the transmitting/receiving circuits. One is, the CPU directly sends signals to them, and the other is, the CPU sends serial data to each circuit board and there the data are converted to parallel data that controls each circuit. The CPU controls TX/RX board and PA/FIL board by sending serial-data from P40: DATA, and DDS circuit in TX/RX from P90: DDS DATA.
  • Page 17 Serial-data LATCH (ST) While data and clock are sent from CPU, changed data is taken in by LATCH signal. Figure 2-4 Transmission Timing M54972P (8BIT SERIAL INPUT LATCHED DRIVER) power P-GND Driver GND Enable input LATCH Latch input S out serial output Serial data input clock...
  • Page 18 Table 2-3 TX/RX Serial Data List 2-11...
  • Page 19 Table 2-4 PA/FIL Serial Data List Status Functions LPF1 0.1 to 2.4 MHz: "L" LPF2 2.4 to 3.6 MHz: "L" LPF3 3.6 to 6.0 MHz: "L" LPF4 6.0 to 10.0 MHz: "L" LPF5 10.0 to 18.0 MHz: "L" LPF6 18.0 to 30.0 MHz: "L" NOT USED NOT USED 2-12...

  • Page 20: Oscillator

    2.3 Oscillator Taking J3E as an example, the outline of the frequency conversion is shown in Figure 2-6 and the relation between the transmitting and receiving frequencies and local frequencies is shown in Table 2-6. The frequency conversion circuit and the local oscillator circuit are included in TX/RX board.
  • Page 21 Figure 2-7 Block Diagram of Synthesizer Circuit 2-14...
  • Page 22 3rd Local Frequency (3Lo) 3Lo is generated by PLL3 (U504). The oscillating frequency varies in accordance with the class of emission. For example, 456.5 kHz is for J3E (USB) and 456.7 kHz for J2B (TLX). 2nd Local Frequency (2Lo) 2Lo, 54 MHz, is generated by mixing the output of a reference oscillator (Y501), 36 MHz, with one half of the frequency, 18 MHz.
  • Page 23 VCO CONT · C = 1000 pF · CR506 to 508 = 1SV232 (Variable capacity diode) Q503 T501 - 504 12 V (C1 + C2) × (C3 + C4) 2 π L × BAND Select (C1) (C2) (C1 + C2) + (C3 + C4) T501 - 504 R522 VCO OUT...

  • Page 24: Tx/Rx Circuit

    2.4 TX/RX circuit TX/RX section (J3E) The AF input signal from a dynamic microphone (600 Ω, rated input -46 dBm) is ampli- fied by a compressor amplifier U14 (M51304L) to increase the average transmitting power and to suppress an over-input as well. At the next stage U5 2/2, the AF signal gain is adjusted in accordance with the radio wave format J3E and H3E.
  • Page 25 60M H.P.F CR10 30M L.P.F 455 kHz F + 1.5 kHz CR11 (To PA/FIL PCB) 54.455 MHz (MC1350D) CR24 (RF DET) 2Lo (54 MHz) 1Lo (F + 54.455 MHz + offset:1.5 kHz) (Power CONT) ALC (From PA/FIL PCB) U7/8 ALC REF (From CPU: Power data) CHK EXC Figure 2-10 455 kHz Circuit thru Exciter The power of this transmitting signal is adjusted in a gain-control IF amplifier U6...
  • Page 26 Note) PA amplifier is high-frequency-grounded to -13.6 V line through capacitors C49 to C52. RX IN 2SC3133 2SC3240 TX/RX K3 (BK) EXC OUT -1.5 dB R14-16 PA OUT PA IN Q8/U2 PA ON DRIV BIAS PA BIAS Q1, 2, 3, 11, K1 PA ON PA BIAS 13.6 V +...
  • Page 27 Q26, 25 EXC OUT U7, 8 TX/RX Board ALC Circuit ALC REF: POWER DATA Figure 2-13 ALC Signal 2-20...

  • Page 28: Receiver Circuit

    2.5 Receiver Circuit PA/FIL section The RF signal received by the antenna inputs to PA/FIL board, passes through the com- mon L.P.F.'s for transmitting/receiving and BC-band-rejection filter, and outputs to TX/RX board. The BC-band-rejection filter is a 1.6 MHz H.P.F and switched ON/OFF with the jumper wire connections at J8 and J9.
  • Page 29 60 M H.P.F Q1,/2 455 kHz CR10 F + 1.5 kHz 30M L.P.F 30 M L.P.F CR11 2.4 k 54.455 MHz •i 2SK937•j (MC1350D) (MC1350D) 0.4 k 1Lo (F + 54.455 MHz + offset: 1.5 kHz) 2Lo (54 MHz) 6.0 k 455 kHz Figure 2-15 Receiver RF Circuit Reference) Noise blanker (NB)
  • Page 30 R210 connected to Q39 (RX GAIN) adjusts the receiving gain according to AGC level. In J3E (4 MHz), the R210 is adjusted so that the S-meter starts to deflect when the gain volume is at maximum and an antenna input (SSG level) is +10 dBµV. A thermister RT4 compensates the temperature characteristic of the overall receiving gain.
  • Page 31 RF GAIN VR U3 1/2 U3 2/2 U1, 2 U4 1/2 U4 2/2 CR18, 19 (MC1350D) 455 kHz R210 AGC OFF AGC FAST CR20, 21, U5 H3E DET AM AF CR22 J3E AF 3Lo (J3E: 456.5 KHz) Figure 2-18 AGC and Demodulator Circuits In the AM demodulating circuit, the receiving signal (455 kHz) is amplified by Q19, de- tected by CR21/22, and derives audio signal.
  • Page 32 RX H3E DATA SP OFF MIC & TONE MIC ON U11, 12 RX AF OFF ST TX/RX MIC&TONE MIC ON TX AF LINE LINE ON LINE IN TX TONE LINE ON MUTE MUTE LINE IN AF VR RX H3E RX AF OFF C142 U13 2/2 C141...

  • Page 33: Power Supply Sw Circuit

    2.6 Power Supply SW Circuit Power supply SW circuit is included in PA/FIL board. When the power switch is turned on, a relay K1 is made ON by Q1 and power is supplied to circuits. To protect the contact of K1 against the rush current at power on, a delay cir- cuit is provided.

  • Page 34: Sw Reg Board (Option)

    2.7 SW REG Board (option) The negative line of the power supply and the negative ground of the circuit boards (chassis) shares a common earth. When a floating ground that separates the negative line and the negative ground is needed, SW REG board is to be added. PA/FIL board and SW REG board are connected by connectors as follows.

  • Page 35: Ant Coup (Antenna Coupler)

    2.8 ANT COUP (Antenna Coupler) 1. General AT-1503 is tunable to an antenna length from 6 m to 15 m in a frequency range of 1.6 MHz to 27.5 MHz. U8 (MPU) starts the automatic tuning (matching) with "TUNE" sig- nal from the main unit and the result of the matching is sent to the CPU in the main unit by H and L levels of BUSY signal.
  • Page 36 2. Matching Process (TUNE/BUSY Signals) 1. When PTT switch is depressed or TX KEY is turned ON by an external device after the frequency change, or when TUNE switch is depressed, "TUNE" is displayed on the main unit and "TUNE" signal inputs to the antenna coupler. 2.
  • Page 37 3. Matching Circuit AT-1503 uses two L-type matching circuits with a nominal input impedance Z of 50 Ω as shown below. Refer to Figure 2-25 for the variation of the input impedance with fre- quency. The matching circuit in the MF band is shown below, where the antenna length is less than one quarter of the wavelength.
  • Page 38 Matching Flow Chart Start K1, K2 Detector ON (Freq./VSWR/Phase detection) Vf Read Checking RF Input Vf > Data obtained SWR Calculation Bypass SWR < 1.5 K3 to K12 ON Keeping relays on Freq. Read Checking RF Input Frequency Outputting TUNE END and TUNE ERROR RAM DATA in DATA...
  • Page 39 Matching Operation Start SWR Calculation SWR < 2.0 Matching CKT bypassed Changing L for L UP/DOWN minimum Vr Phase measurement Changing C for C UP/DOWN minimum Vr Capacitive Inductive Phase ? SWR Calculation Capacitive Tuning Inductive Tuning DATA SWR < 1.3 See note 2.
  • Page 40 4. THROUGH Signal The antenna coupler control depends on the system setting 9921 ("through"-signal of an- tenna coupler). The through-signal brings the characteristics of the matching circuit to a through condition, and is not a static H or L signal but pulse signal. The through-signal turns OFF the relay for controlling the coils K3, K7, and K10, turns ON the relay for other coils, turns OFF the relays K13 to K22 for controlling the capaci- tors, and makes the frequency characteristics of the antenna coupler flat by adding L1, L5,...

  • Page 41: Interface

    2.9 Interface 1. REMOTE (A), (B) An optional REMOTE board is needed to connect DSC, NBDP terminal, remote station (RB-500), and distributor (DB-500, DB-120). One of two types of REMOTE boards is selected according to the connecting device, (A): 05P0457 for RS-232C and (B): 05P0458 for current loop. ⋅...
  • Page 42 Operation with MIF Command The FS-1503 can be controlled by MIF commands from Furuno's NBDP, DSC and re- mote station. The following explains how MIF command from the DP-6 controls the FS-1503. Operation on DP-6 1. Press [F4] (window). 2. Select "3: Remote A (TX/RX).
  • Page 43 MIF Command List Command Description Keylock setting, getting highest priority. (DISTRESS) Releasing keylock, (DISTRESS) Keylock setting, Highest priority to 2182 KHz from main unit (FREEZE) Releasing keylock, (FREEZE) [*; 0: LSB, 1: J3E, 2: H3E, 5: TLX, 6: FAX] FT******* TX freq.
  • Page 44 2. CONTROL Providing a BK line requires an optional CONTROL board. Current capacity of CR1,Vobc) in the BK line is 1A. CONTROL (05P0459) CONTROL BK +12 V/24 V Receiver U3 (PC357NT) TX KEYED BK + TX KEYED BK RL (V06C) TX KEYED/ (2SD799) RX MUTE...
  • Page 45 Chapter 3 Location of Parts 3.1 Main Unit 1. FS-1503 Front Panel Internal Speaker FREQ/CH MIC/HANDSET Power SW & AF GAIN RF GAIN 2. FS-1503 Rear Panel SPKR REMOTE 13.6 VDC CONTROL (OPTION) (OPTION) COUPLER...
  • Page 46 3. TX/RX Board FL-3: 0.4 kHz R210 (RX GAIN) Q25: 2SC3133 [Option] 13.6 V R101 (H3E CARR) R156 30 A × 2 (TX GAIN) CONTROL 05P0459 C554 (OPTION) (Freq. ADJ) Y501 REF X’ tal: 36 MHz REMOTE (OPTION) A: 05P0457 (RS-232C) B: 05P0458 (Current Loop)
  • Page 47 4. PA/FIL Board (05P0667)/SW REG Board (05P0668) Note 1) TX FIL ranges • B1: 0.1 to 2.4 • B2: 2.4 to 3.6 • B3: 3.6 to 6.0 SW REG • B4: 6.0 to 10.0 05P0668 (OPTION) • B5: 10.0 to 18.0 •...
  • Page 48 5. CPU Board (05P0665) U2: HD61602 U5: X24C16S (LCD Bril. Adj.) (EEROM) (LCD CONT) U6: HD6475328 (CPU) SP: 8 Ω/0.3 W (CPU RUN)

  • Page 49: At-1503

    3.2 AT-1503 1. AT-1503 (05P0669) (Standard type) (SELF TEST/TUNE) F1: 1.35 A U8: HD63B01Y0E76P (Switch) (CPU) S1 (TUNE) TB 2 R2 (BAL ADJ or ADJ) TX IN/RX OUT (Built-in dummy type: optional) DUMMY: 05P0670 (OPTION)

  • Page 50: Power Supply Unit

    3.3 Power Supply Unit 1. PR-200 635S1002 Front Right-hand Side View Front Top View R6 (13.6 V AVR ADJ) 635S1001 (32 V: Short-circuit) Front Left-hand Side View...
  • Page 51 2. PR-270 Front Right-hand Side View 635S1002 Change tap connection (13.6 V AVR ADJ) according to ship’s mains. (0, 110, 120 V) 635S1001 Front Top View Front Left-hand Side View...

  • Page 52: System Channels List

    The system channels list is shown on the next page. The system channels marked * can only be set by a Furuno service agent or dealer. These channels can be recalled by enter- ing the password. The procedure for changing user settable system settings appears in the Operator's Manual.
  • Page 53 4.1 Changing System Settings 1. While pressing and holding down [CH], turn the power on. System channel 9942, setting number 1, and MEMO appear on the screen. System channel 9 9 4 2 Preset value MEMO 2. Select the system channel 9999 by rotating the FREQ/CH knob. 3.
  • Page 54 4.2 System Channels List Note that channels marked by * can be recalled by entering the password on system channel 9999. Setting Default Function Thai. 9900 * Country Standard Thai. 9901 * User Channel Clear [CH] [1] [ENT] 9902 [CH] [1] [ENT] 150 W 150 W 100 W...
  • Page 55 Description of System Channel 1. 9900 (Country) System settings 9903 and above are preset to default values depending on local rules and regulations. 2. 9902 (TX power data clear) Power data is changed to default settings as below. ⋅ Standard, USA HIGH: 220 (150 W) LOW: 140 TUNE: 40 ⋅...
  • Page 56 6. 9906 (Channel/Frequency Indication) ⋅ 0: CH/Freq: The selected RX channel and frequency are displayed on the up- per and lower rows respectively. The selected TX channel and frequency are indicated when the PTT switch is depressed. Both TX and RX frequency can be momentarily displayed on the upper and lower rows respectively by pressing [ENT].
  • Page 57 ⋅ 1: RF: The meter indicates RF output level. 15. 9924 (Remote Signal Format) ⋅ 0: MIF: Furuno radio interface. Selected when Furuno DSC or NBDP terminal is connected. ⋅ 1: TBUS: For equipment made by "Thrane & Thrane A/S" of Denmark.
  • Page 58 19. 9998 (User Channel Memory/Power Adjustment) ⋅ 0: Enable: Enabling to write TX and RX frequencies and adjust TX power on user channels. ⋅ 1: TX/RX: Enabling to write TX and RX frequencies on user channels. ⋅ 2: RX: Enabling to write RX frequencies on user channel. ⋅...

  • Page 59: Channel Programming

    4.3 Channel Programming 199 user channels are divided into two bands; 0 and 1. Further channels are divided into ten scan groups which are able to be scanned as a group. TX and RX frequencies and class of emission can be preset on each user channel. In addition, a user channel name can be entered on 65 channels, 0-01 to 0-065.
  • Page 60 8. Enter a receiving frequency(R): Press [CH], enter a frequency with numeric keys, and then press [ENT]. Reenter a frequency after pressing [CH] if necessary. 9. Rotate the FREQ/CH knob cw by one click to select the TX frequency(T) on the same channel.
  • Page 61 How to erase programmed frequency 1. Follow steps 1 to 5 described in “How to program user channel” on page 4-8. 2. Select an RX channel to be erased by rotating the FREQ/CH knob. (For example, 0-010R) 3. Press [CH], [0], and [ENT] in this order. 4.
  • Page 62 Symbols for Channel Name The radiotelephone employs symbols to indicate channel names. The symbols and their corresponding letter are shown below. A B C D E F G H I K L M N O P Q R S T U V X Y Z 1 2 3 4 5 6 7 8...

  • Page 63: Power Data Setting

    4.4 Power Data Setting The output power can be set by changing power data through the keyboard. Adjustment of any potentiometers inside the unit is not necessary. Frequency ranges in which power data is effective are tabled on the next page. System channel 9998 must be set to “0”...
  • Page 64 Frequency Ranges for Power Adjustment Power data can be set on following frequency ranges and classes of emission, (Marked by “•”). Power data for user channel is entered for all classes of emission. HI Power LOW Power BAND • • •...
  • Page 65 How to adjust HI power 1. Select a TX channel. For example, select the ITU channel 401. 2. Press [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 [8], and HI power data appears. T appears during TX.
  • Page 66 How to adjust LOW power 1. Select a TX channel. For example, select the ITU channel 401. 2. Press [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 [9], and LOW power data appears. T appears during TX.
  • Page 67 How to adjust TUNE power Tune power data is factory-adjusted to 40. Do not change this setting unless Furuno asks you to change this setting. Too high setting may cause the antenna coupler to burn out. 1. Select a TX channel. For example, select the ITU channel 401.

  • Page 68: Bc Band Filter Setting

    4.5 BC Band Filter Setting If MF/HF band is interfered with broadcast(BC) band, change jumper settings J8 and J9 from "2" 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 BC BAND FIL Factory-Setting 0.1 to 30 MHz...

  • Page 69: Setting For Nbdp (Dp-6)

    Normal Reverse Self Test 2. Press [F5] and enter the answerback code and the ID. Setting on FS-1503 ⋅ 9908 (TLX usage): 0 (TX/RX) ⋅ 9909 (TLX RX bandwidth): 1 (Narrow) -------- Optional 0.4 kHz filter required ⋅ 9910 (System delay): 10 msec ⋅...
  • Page 70 Chapter 5 Maintenance DANGER Electrical Shock Hazard: This equipment contains high voltages which can cause death at several internal circuits. Any internal adjustment, servicing and repair shall only be perfomed by qualified service personnel totally familiar with electrical circuits and servicing of the equipment. A residual charge remains in capacitors and other devices several minutes after turning off the power.

  • Page 71: Self-Test

    5.2 Self-test Both the main unit and the antenna coupler contain a self-test facility which can check them for proper operation. The test checks transceiver circuit, LCD, keyboard, and an- tenna coupler. Note) If the dummy board is not fitted, the test is carried out only for TX/RX board. Transceiver Check 1.
  • Page 72 Self-test Algorithm (TX/RX Board) TX + POWER ON Power on while pressing and holding down [TX]. 13.5 MHz produced from 2LO is input to antenna. TLX/AGC: ON/RF gain: max. /Freq.:13.5 MHz Mode: TLX, AGC:ON, RF GAIN: automatically set to Max. Self check signal: ON U22 ON TX/RX PCB: ON S level reading...
  • Page 73 (PA and Antenna Coupler) From previous page TE disappeared Reset to 3 MHz, TLX, POWER DATA: 35 TLX/Tone : 1700 Hz/Freq.:3 MHz/Dummy: ON/Tune power data: 35 SET • j T LX/Tone • F 1 700Hz/Freq.3MHz/Dummy ON/Tune power data • F 3 5 Transmitter in main unit and coupler check (TUNE operation) Tuning operation...
  • Page 74 LCD/Keyboard Check 1. While pressing and holding down [ENT] key, turn on the power. 2. Release the hand from [ENT] when all indications appear on the screen. 3. Press each key so that the corresponding number appears on the screen. See table below.

  • Page 75: Troubleshooting

    5.3 Troubleshooting Table 5-1 Troubleshooting Guide List Symptom Possible Cause/Test Remedy Brown in-line fuse (30A). Replace fuse. Check power supply for Overvoltage protector (17 V) activated. 13.6 V ± 15 %. Defective power switch. Disconnect power power being connector, check between J1 #1 and #2 on Replace switch.
  • Page 76 Symptom Possible Remedy Carry out self-test. If TE is NG, TX signal Replace TX/RX board. is not output from TX/RX board. Carry out self-test. If TP is NG, TX signal Replace PA/FIL board. is not output from PA/FIL board. Abnormal Carry out self-test.

  • Page 77: Measurement

    1. Frequency Adjustment Note) Allow a frequency counter 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.
  • Page 78 Ω or 8 Figure 5-3 Measurement on RX Circuit 2. Set the FS-1503 as below. ⋅ RF GAIN: Maximum ⋅ RX Freq.: 4.0 MHz, MODE: J3E, AGC: on ⋅ AF GAIN: 50 % of rated noise output (100 mVrms for 4-ohm speaker, 200 mVrms for 8-ohm speaker) 3.
  • Page 79 4. J3E RX Total Gain 1. Make a connection as shown in figure 5-3. 2. Set the FS-1503 as below. ⋅ RF GAIN: Maximum ⋅ RX Freq.: 4.0 MHz, MODE: J3E, AGC: on ⋅ AF GAIN: Maximum 3. Applying 4.0 MHz + 1.0 kHz signal from the SSG, adjust the SSG output level so that the AF output level is 1W.

  • Page 80: How To Change Pa Transistor

    5.5 How to Change PA Transistor CAUTION: Apply a thin coating of silicone grease to transistor 2SC3240. The grease aids the transfer of heat from the transistor to the chassis. Before wiring, transistor must be fixed to the chassis securely. The PA bias must be checked after replacing the PA transistor.
  • Page 81 5.6 Measurements and Adjustment CAUTION: Do not turn any adjusters until you understand their functions. The measuring instruments must be calibrated before using. DANGER Electrical Shock Hazard: This equipment contains high voltages which can cause death at several internal circuits. Any internal adjustment, servicing and repair shall only be perfomed by qualified service personnel totally familiar with electrical circuits and servicing of the equipment.
  • Page 82 Table 5-2 Adjustment (2/2) Board Item Setting Adjuster Check Point Level Remarks OSC Circuit 54 MHz ± Ref. OSC, 30 minutes after TP3 (H) - 1 Hz 2Lo output C554 Frequency power-on TP4 (C) 1.1 Vp-p to (54 MHz) 1.5 Vp-p 3rd Local TP7 (H) - more than...
  • Page 83 DANGER Electrical Shock Hazard: This equipment contains high voltages which can cause death at several internal circuits. Any internal adjustment, servicing and repair shall only be perfomed by qualified service personnel totally familiar with electrical circuits and servicing of the equipment. A residual charge remains in capacitors and other devices several minutes after turning off the power.
  • Page 84 Table 5-3 Measurements (2/2) Board Name Check Points *Setting Reading Remarks TX Circuit EXC OUT 14 Vp-p PA connected CHK EXC 2.4 Vdc CR24-K Q25: B-GND 0.5 Vp-p C-GND 15 Vp-p 2SC3133 Q25: B-GND 0.65 Vdc C-GND 13 Vdc TP5 - TP6 0.65 Vp-p 1 MIX MOD AF Input TP8 - TP9...

  • Page 85: Location Of Parts

    5.7 Location of Parts 1. CPU Board (05P0665) 5-16...
  • Page 89 5. DUMMY CONT Board (05P0670): Optional 6. SW REG Board (05P068): Optional 5-20...
  • 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...
  • Page 115 Page Outline Drawing FS-1503 C5614-G01 Outline Drawing AT-1503 C5614-G02 Outline Drawing RP-270 C5485-031 Outline Drawing PC-220 C5485-029 Interconnection Diagram E5614-C01 FS-1503 General Ckt FS-1503 C5614-K01 05P0665 C5614-K07 050666 (1/2) C5614-K04 TX/RX 05P0666 (2/2) C5614-K05 NB DET 05P0466 C5548-K12 S-10 CONTROL...
  • Page 134 05P0667 board, add C27 (DM15C331J5, 000-154-416) across the primary winding 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) C27 added on 05P0667 Transistor...
  • Page 135 PA Transistors, 2SC2879A Fig.4 PA/FIL board, 05P0667A No shield cover New TX/RX board has no shield cover for PLL circuit. Fig.5 TX/RX board, 05P0666B/C CPU board Fig.6 CPU board, 05P0665A and PANEL board, 05P0664A PANEL board...

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