Icom RD-200, FP-561 Service Manual

SERVICE MANUAL
MARINE PLOTTER/SOUNDER
DGPS BEACON RECEIVER
6-9-16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan Phone : 06 6793 5302 Fax : 06 6793 0013
Communication Equipment Himmelgeister Str. 100, D-40225 Düsseldorf, Germany Phone: 0211 346047 Fax : 0211 333639 URL : http://www.icomeurope.com
Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone: 01227 741741 Fax : 01227 741742 URL : http://www.icomuk.co.uk
Zac de la Plaine, Rue Brindejonc des Moulinais BP 5804, 31505 Toulouse Cedex, France Phone: 561 36 03 03 Fax : 561 36 03 00 URL : http://www.icom-france.com
Crta. de Gracia a Manresa Km. 14,750 08190 Sant Cugat del Valles Barcelona, SPAIN Phone: (93) 590 26 70 Fax : (93) 589 04 46 URL : http://www.icomspain.com
<
Corporate Headquarters
>
2380 116th Avenue N.E., Bellevue, WA 98004, U.S.A. Phone: (425) 454-8155 Fax : (425) 454-1509 URL : http://www.icomamerica.com
<
Customer Service
>
Phone: (425) 454-7619
A.C.N. 006 092 575 290-294 Albert Street, Brunswick, Victoria, 3056, Australia Phone: 03 9387 0666 Fax : 03 9387 0022 URL : http://www.icom.net.au
6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C. Phone: (02) 2559 1899 Fax : (02) 2559 1874
3071 #5 Road, Unit 9, Richmond, B.C., V6X 2T4, Canada Phone: (604) 273-7400 Fax : (604) 273-1900 URL : http://www.icomcanada.com

INTRODUCTION

DANGER
ORDERING PARTS
REPAIR NOTES
This service manual describes the latest service information for the
FP-561 MARINE PLOTTER/SOUNDER and RD-200
DGPS BEACON RECEIVER
MODEL
FP-561
VERSION
General
Europe
at the time of publication.
SYMBOL
GEN
EUR
To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation.
NEVER connect the unit to an AC outlet or to a DC power supply that uses more than 33 V (FP-561) or 16 V (RD-200). Such a connection could cause a fire hazard and/or electric.
DO NOT expose the unit to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when
connecting the unit. DO NOT apply an RF signal of more than 20 dBm (100mW)
to the antenna connector. This could damage the unit’s front end.
FP-561
Be sure to include the following four points when ordering replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required <SAMPLE ORDER>
0910051392 PCB B-5305 FP-561 MAIN UNIT 1 pieces 8810004540 Screw BiH 3x8 SUS FP-561 Chassis 10 pieces
Addresses are provided on the inside back cover for your convenience.
RD-200
1. Make sure a problem is internal before disassembling the unit.
2. DO NOT open the unit until the unit is disconnected from its power source.
3. DO NOT force any of the variable components. Turn them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An insulat- ed turning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the unit is defective.
6. READ the instructions of test equipment thoroughly before connecting equipment to the unit.

TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS
1-1 FP-561 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1-2 RD-200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
SECTION 2 INSIDE VIEWS
2-1 FP-561 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-2 RD-200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
SECTION 3 CIRCUIT DESCRIPTION
3-1 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3-2 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3-3 REGULATOR CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3-4 INTERFACE CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3-5 LOGIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3-6 DGPS RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3-7 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
SECTION 4 ADJUSTMENT PROCEDURES
4-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4-2 FP-561 TRANSMITTER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4-3 FP-561 RECEIVER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4-4 FP-561 WATER TEMPERTUREM ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4-5 RD-200 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISASSEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8-1 FP-561
8-1-1 SW UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
8-1-2 LOGIC UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
8-1-3 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5
8-2 RD-200
8-2-1 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-7
8-2-2 ANT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9
SECTION 9 BLOCK DIAGRAM
9-1 FP-561 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1
9-2 RD-200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2
SECTION 10 VOLTAGE DIAGRAM
10-1 FP-561 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1
10-2 RD-200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3
1-1 FP-561
GENERAL
• Display : 5.6 inch TFT color LCD (320×234 pixels)
Power supply requirement : 11–30 V DC
LCD brightness : 16 levels
Power consumption : Less than 22 W (Less than 1.8 Aat 12 V DC)
Dimensions (projections not included) : 186(W)×203(H)×102(D) mm; 7
5
16(W)×8(H)×4(D) in
Weight (approx.) : 2.2 kg; 4 lb 14 oz
Usable temperature range : 0˚C to +50˚C; +32˚F to +122˚F
Unit of water depth : m (meter), FT (feet), FM (fathom)
Unit of water temperature : ˚C, ˚F
Unit of speed : KT (knots), km/h, MI/h (miles/h)
Unit of distance : NM (nautical miles), km, MI (miles)
Input data format : NMEA0183, Water temp./speed, DGPS
Output data format : NMEA0183 (GGA, GLL, XTE, AAM, VTG, BOD, WPL, BWC),
Start-stop serial forward; 4800 bps
GPS
Receive system : 12 parallel-channel, all-in-one view
Receive frequency : 1575.42 MHz (±1 MHz)
Measuring accuracy (2DRMS) : Position 100 m, 95% of the time, PDOP3 (Less than 100 m, S/A OFF)
Speed Less than 1 m/sec. (PDOP
3, S/A ON)
NOTE: All GPS receivers are subject to degradation of position and velocity accuracy under the U.S. Department of
Defence.
Data renewed interval : 1 sec.
PLOTTER
Scale setting : 16 steps
Plotting interval : 5 sec. to 60 min., 0.019.99 NM*
No. of track memories : 5000 (selectable from 7 colors)
No. of route memories : 20 (50 points/route)
No. of event markers : 500
Navigation computer : Vessel position (longitude/latitude), cursor position, distance, elapsed time,
course-out distance, direction, distance, time
Data indication : Coastline, place name, contour line, route, lighthouse, longitude/latitude line
Alarm : Area and Arrival alarms
1 - 1

SECTION 1 SPECIFICATIONS

1 - 2
All stated specifications are subject to change without notice or obligation.
VIDEO SOUNDER
Transmission freq. : 50 kHz, 200 kHz
Output power : 500 W RMS
Water depth range : 5640 m* in 8-color indication
Water temp. range : 0˚C to +40˚C; +32˚F to +104˚F
Speed range : 0.099.9 KT*
Bottom lock expansion range : 5 m*, 10 m*, 20 m*, 40 m*
Phase shift variable range : 1640 m*
Type of display screen : Standard, A-scope, dual frequencies, bottom and marker zoom
Picture sweep speed : 6 levels including pause
Alarm : Shallow, depth and fish school
*selectable in each unit
1-2 RD-200
GENERAL
Frequency coverage : 283.5 kHz to 325.0 kHz
Type of emmision : 1K0F2B
Antenna impedance : 50 nominal
Intermediate frequency : 455 kHz
Usable temperature range : 20˚C to +70˚C; 4˚F to +158˚F
Power supply requirement : 12 V DC nominal negative ground
Current drain (at 12 V DC) : Less than 0.2 A
Dimensions (projections not included) : 140(d)×157.2(H) mm; 5
1
2(d)×63⁄16(H) in
Weight : 1.0 kg; 2 lb 3 oz
RECEIVER
Intermediate frequency : 455 kHz
Sensitivity : 0.2 µV at 12 dB SINAD
Sprious response : 60 dB
Intermodulation : 50 dB
2 - 1

SECTION 2 INSIDE VIEWS

2-1 FP-561
• MAIN UNIT
• LOGIC UNIT
+5V regulator (IC13: PQ05RF21)
GPS receiver
Switching control (IC9: UPC494GS)
12V rectifier (D13: SB30-09J)
8V rectifier (D22: SB30-09J)
+6V regulator Q27: 2SD1664 Q D37: RD7.5M B1
40V rectifier (D12: RG-2A)
Power amplifier Q6, Q7: FS30KMJ-3 Q23, Q24: 2SC3326-B
Driver IC2: TC4093BF Q2, Q3: 2SC2712-GR Q4, Q5: 2SA1162-GR
STC circuit Q1: 2SC3326-B Q26: 2SC2712-GR
200 kHz local oscillator circuit IC3: TC3W03FU X1: CR-497 (5.24MHz)
50 kHz local oscillator circuit IC4: TC3W03FU X2: CR-496 (4.04MHz)
Crystal oscillator (X1: DSO-49SJ)
Main CPU (IC1: CL-PS7500FE)
FIFO RAM (IC20: CY7C433-40JC)
DRAM (IC34, IC35: M5M44260CJ)
SRAM (IC30, IC31: M5M51008BVP-70LL)
Flash ROM (IC32, IC33: MBM29F800BA-90PFTN)
Sub CPU (IC22: TMP90PM36F)
Mail box RAM (IC21: M66220FP)
DC-DC converter Q4: 2SB120IS Q5: XP6501AB
2 - 2
2-2 RD-200
• MAIN UNIT
• ANT UNIT
DDS (IC6: SC-1287)
1st mixer (IC2: ND487C1 3R)
CPU (IC12: HD64F3644H)
EEPROM* (IC13: X25320SI-2.7)
D/A converter (IC19: TA75S01F)
Reference oscillator (X1: DSX751S 14.5984MHz)
+5V regulator (IC9: TA7805F)
IF filter (FI1: CFJ455K8)
IF amplifier* (Q1: 3SK131 K)
RF amplifier* (IC1: µPC1676G)
* : Located under side of these point
+8V regulator (IC8: TA7808F)
FM IF IC* (IC3: TA31136FN (D))
+6.5V regulator* Q3: 2SD1664 Q D2: MA8075 L
RF amplifier (Q1– Q8: 2SK209 GR)
3 - 1

SECTION 3 CIRCUIT DESCRIPTION

3-1 TRANSMITTER CIRCUITS
3-1-1 TRANSMIT OUTPUT PULSE CONTROL
CIRCUIT
The 200 kHz/50 kHz pulse signals from the LOGIC unit via J1 (pin 3) are passed through the buffer amplifier circuit (IC1, pin 1 and pin 3), and are inverted and output from IC1 (pin 2 and pin 5) as 180˚ phase difference pulse signals.
The signals from the buffer amplifier are passed through the integrate circuits (D1, R2, C3 and D2, R3, C4) which adjust switching time for tuning ON Q6, Q7 separately to prevent overlap of output pulses (200 kHz and 50 kHz). The integrate circuits change the pulse signals which characteristics of 50 % duty-cycle to slow switching time for leading and leave quick switching time for trailing.
The pulse signals are applied to the Schmitt NAND gates (IC2, pins 1 and 5). Also trasmit triger signal from the LOGIC unit is applied to IC2 (pins 2 and 6) via C86. Only when both signals are input, IC2 outputs transmit signals from pin 11 or pin 10.
3-1-2 TRANSMITTER OUTPUT CIRCUIT
The transmitter output circuit consists of the driver and out­put circuits.
The driver circuit consists of Q2–Q5. The Darlington connec­tion, used for switching circuits, consists of a pair of transis­tors for Q2 and Q4, and for Q3 and Q5. This is because the next circuit which consists of FETs requires quick switching time for leading and trailing characteristics.
The output circuit consists of Q6, Q7 and T1. When no trans­mission is occurring, transmit power is charged into C28 and energy outputs at the next moment by turning ON Q6 or Q7.
3-1-3 OUTPUT POWER CIRCUIT
This circuit consists of IC10, Q11, Q12 and Q13. A signal from the LOGIC unit controls voltage to be applied to the pri­mary winding of T1 through these components.
3-1-4 DIODE ISOLATION CIRCUIT
D3, D30, D4, D31, D9, D32, D35, D36 are symmetry-type sil­licon-varister diodes. Interior connection is simulated as shown in the diagram (Fig.1).
Fig.2 shows the diodes electronic characteristics. When the voltage is +Vd or less, internal resistance is infinitie. This condition is the same as when a diode is OFF. when the volt­age exceeds +Vd, internal resistance for each diode is at its minimum level. This condition is the same as when a diode is turned ON.
When transmitting, high voltage is applied to the circuit and when receiving, no voltage is applied. Therefore, the receiv­er circuit is protected from high power transmit signals when transmitting, and the receiver circuit is isolated from the transmitter circuit when receiving.
3-2 RECEIVER CIRCUITS
3-2-1 RECEIVER MATCHING CIRCUIT
The matching circuits for the 200 kHz signal and for the 50 kHz signal consist of L1, C93 and L6, C96 respectively. The tuned signals at each matching circuit are applied to the ana­log switch (IC16).
The analog switch (IC6) switches received signals by the Rx frequency control signal (LOCONT) from LOGIC unit via J5 (pin 5), and then outputs to the next stage which is the mixer circuit.
When transmit/receive 200 kHz signal, LOCONT is low level and pin 7 (IC16) is ON. Therefore, IC16 (pin 1) outputs tuned 200 kHz signal.
When transmit/receive 50 kHz signal, LOCONT is high level and pin 6 (IC16) is ON. Therefore, IC16 (pin 1) outputs tuned 50 kHz signal.
I
I
V
V
+Vd
–Vd
Fig.1 Fig.2
• DIODE ISOLATION CIRCUIT
3 - 2
3-2-2 STC CIRCUIT
The STC circuit (Q1, R115, Q26, R116, C102) reduces the sensitivity near-by the dispach line to set the immunity to air bubbles in the sea surfaces so as to improve the image leg­ibility.
When transmitting, the Tx trigger signal (TXTRG) from LOGIC unit via J5 (pin 4) is high level, at this time Q26 is ON and then Q1 turns ON. When switching TX to RX, the Tx trig­ger signal (TXTRG) becomes low level and Q26 is OFF, and then Q1 turns to OFF slowly by connecting time constant (R116, C102).
Thus the STC function activates.
3-2-3 MIXER AND DETECTOR CIRCUITS
The mixer circuit converts the received signals into the 455 kHz IF signal.
The FM IF IC (IC5) contains the mixer, 455 kHz IF amplifier and RSSI circuits.
The 200 kHz/50 kHz signals from the STC circuit (Q1) are applied to the mixer section of IC5 (pin 16), and are mixed with the 655 kHz/505 kHz LO signals generated at the 200 kHz/50 kHz local oscillator circuits to produce a 455 kHz IF signal.
The 455 kHz IF signal from IC5 (pin 3) passes through the ceramic filter (FI1), where unwanted signals are suppressed, and is then applied to the IF amplifier section in IC5 (pin 5). IC5 (pin 12) outputs RSSI voltage accoding to the input level of IF amplifier section. The RSSI voltage is amplified at the DC amplifier (IC6) to obtain necessary level, and is then applied to the LOGIC unit.
The RSSI control signal from the LOGIC unit via J1 (pin 13) becomes high level when the received signal is deeper than 80 m. Then the signal reduces noise by turning ON Q25 to connect the by-pass capacitor (C90).
3-2-5 LOCAL OSCILLATOR CIRCUITS
200 kHz/50 kHz local oscillator circuits consist of IC3, X1 and IC4, X2 respectively. IC3 or IC4 includes a frequency divider. When high level signal is applied to pin 1, IC3 or IC4 oscil­lates and divides frequency, when low level signal is applied to pin 1, these IC stop the oscillation.
The local oscillator circuit oscillates a local frequency accord­ing to the receive frequency. The oscillator frequency is 655 kHz when the receive frequency is 200 kHz since the equip­ment IF frequency is 455 kHz. In the same way, when the receive frequency is 50 kHz, the oscillator frequency is 505 kHz.
When Rx frequency switching signal (LOCONT) is low level, IC3 (pin 5) outputs 655 kHz signal. When the line is high level, IC4 (pin 5) outputs 505 kHz signal.
3-3 REGULATOR CIRCUITS
3-3-1 INPUT CIRCUIT
11–30 V DC power is applied to the MAIN unit via the PWR connector (J3) and is then passed through the line filter (L2, C44–C47) to SW unit (via the LOGIC unit). The line filter fil­ters RF signals to prevent their application to the swiching circuit.
3-3-2 SWITCH CIRCUIT
SW1 and SW2 from MAIN unit are connected to the power switch (S1) on the SW unit passing through the LOGIC unit. When power switch (S1) is turned ON, power voltage is applied to the regulator circuit (MAIN unit; Q12, Q13, D18) and the circuit activates power control circuit (IC9).
3-3-3 SWITCHING CONTROL CIRCUIT
IC9 includes an oscillator circuit and a switching control. The oscillation frequency is 138 kHz and oscillates sawtooth waves. The time constant circuit (R75 and C77) adjusts the oscillation frequency.
MIXER AND DETECTOR CIRCUITS
Mixer
16
Limiter amp.
IF filter 455 kHz
LO signal (655 kHz or 505 kHz)
RSSI
IC5 TA31136F
12 13 14 15
IF signal from Q1
"RSSI" signal to the CPU
11109
86532147
FI1
FM
detector
3 - 3
3-3-4 SWITCHING CIRCUIT
IC9 (pins 9 and 10) controls the switch circuit (Q14, Q16), and the primary winding of transformer (T2) is alternately connected to and disconnected from the DC power.
3-3-5 RECTIFIER CIRCUIT
The secondary winding of T2 ( pin 6, pin 10 and pin 9) output 40 V , 12 V and 8 V (6 V) respectively. 40 V is rectified by D12, C52 and is applied to the transmitter circuits. 12 V is rectified by D13, C53 and is passed through the line filter (L5, C54), and then applied to DISP unit and etc. 8 V is rectified by D22, C69 and is applied to the 3-termianal 5 V regulator (IC13) and 6 V regulator (Q27, D37).
3-3-6 OUTPUT VOLTAGE CONTROL CIRCUIT
8 V output is divided by R64, R65 and is applied to the com­parator (IC11, pin 3). The applied voltage is compared with other input (IC11, pin 2). When output voltage of IC11 increases due to increase of the 8 V, a base-current of the photo-coupler (IC10) increases and a corrector–emitter’s voltage decreases. At this time, IC9 (pin 2) reduces output voltage and the width of output pulses from pin 9 and pin 10 becomes narrow. And also the interval which Q14 is ON, will be short. Thus the working time of primary winding of trans­former (T2) is short, and the outputs of secondary winding of T2 decrease. This feedback circuit controls the constant out­put voltages even if resistance or input voltage is changed.
3-3-7 LOW VOLTAGE PROTECTION CIRCUIT
Input voltage is divided between R67, R68. The divided volt­age is applied to IC9 (pin 15). When the voltage is lower than 9 V, IC9 is turned OFF.
3-4 INTERFACE CIRCUITS
3-4-1 SHIP SPEED INTERFACE CIRCUIT
Ship speed interface circuit consists of IC7, D27. Ship speed sensor generates palse signals according to the rotation of mill wheel in the water. The pulse signals from the ship speed sensor via the J2 (pin 1) are shaped wave form at the Schmitt circuit (IC7a) and applied to the LOGIC unit via J1 (pin 7).
3-4-2
WATER TEMPERATURE INTERFACE CIRCUIT
The resistance from the external thermistor accoding to the water tempereture is input to MAIN unit via J2 (pin 7), and is then applied to the LOGIC unit via J1 (pin 8).
3-4-3 NMEA INTERFACE CIRCUIT
• NMEA INPUT CIRCUIT
NMEA input circuit consists of IC7, IC8. The NMEA signals from external connector (J4, pins 1, 2) are shaped wave form at the Schmitt circuit (IC7b) via the photo-coupler (IC8), and are then applied to the LOGIC unit via J1 (pin 9).
NMEA OUTPUT CIRCUIT
NMEA output circuit consists of IC17, Q28–Q31. The NMEA signals from the LOGIC unit are input to the MAIN unit via J1 (pin 10). The signals are buffer-amplified and level-shifted at NMEA output circuit, and are then applied to the external connector (J4, pins 3, 4).
3-4-3 DGPS INTERFACE CIRCUIT
DGPS INPUT CIRCUIT
DGPS input circuit consists of IC7, IC15. The DGPS signals from external connector (J5, pins 4, 5) are passed through the photo-coupler (IC15) and shaped wave form at the Schmitt circuit (IC7c), and are then applied to the LOGIC unit via J1 (pin 11).
DGPS OUTPUT CIRCUIT
DGPS output circuit consists of IC17, Q32–Q35. The DGPS signals from the LOGIC unit are input to MAIN unit via J1 (pin
12). The signals are buffer-amplified and level-shifted at DGPS output circuit, and are then applied to the external connector (J5, pins 2, 3).
3-5 LOGIC CIRCUITS
3-5-1 CPU AND THE PERIPHERAL CIRCUITS
(LOGIC UNIT)
The LOGIC unit consists of ROM, RAM and 2 kind of CPU which are 32 bit ARM RISC micro-controller and 8 bit micro­controller. CPUs and a control circuit control all functions. The interrupt signal functions in the following way:
MAIN CPU (IC1)
The main CPU (IC1) is a 32 bit RISC CPU and acts as a computer circuit to control all functions and to respond to all kind of interruptions. The main CPU uses a 32 MHz clock sig­nal from X1.
The main CPU (IC1) generates an address signal and an RGB signal corresponding to display coordinates and the address of DRAM. This IC chip also generates vertical sig­nals and synchronicity signals for the LCD
SUB CPU (IC22)
The sub CPU controls the LCD brightness, ship speed, key­board, sounder and serial communication from the GPS, DGPS, NMEA. The sub CPU uses a RESET signal and 16 MHz clock signal from main CPU (IC1).
RAM (IC20, IC21)
IC20 is a 4k×9 bit FIFO RAM which buffer strage for sending received sounder signal from the sub CPU (IC22) to main CPU (IC1).
IC21 is a 256×8 bit mail-box RAM which communicates GPS data or keyboard data between the main CPU (IC1) and sub CPU (IC22).
ROM (IC32, IC33)
IC32 and IC33 are 8 Mbit flash ROMs. ROM contains a sys­tem operating program and data of world map.
ADDRESS DECODER (IC28)
IC28 is a PLD (programmable logic device) which is address decoder and controller of the card-data reader, and outputs chip select signal to IC1 and I/O peripheral signals.
SRAM (IC30, IC31)
IC30 and IC31 are 1 Mbit SRAMs which backuped by the memory battery (BT1).
DRAM (IC34, IC35)
IC34, IC35 are DRAMs and are used for video RAMs. Each chip has a capacity of 4 Mbits.
3 - 4
3-6 DGPS RECEIVER (RD-200)
3-6-1 ANTENNA CIRCUIT (ANT UNIT)
EP3 and EP4 consist of 2 series of antennas respectively (total 4 series).
The received signal from the antenna (EP3) is tuned at C3, and is amplified at the RF amplifier circuits (Q1, Q2, Q5, Q6).
On the other hand, the received signal from another antenna (EP4) which falls at right angle with EP3, is tuned at C4. The tuned signal is amplified at the RF amplifier circuits (Q3, Q4, Q7, Q8).
The both amplified signals are piled up and are impedance­matched to 50 at L1, and are then applied to the MAIN unit via J1.
3-6-2 RF AMPLIFIER CIRCUIT (MAIN UNIT)
The RF circuit amplifies signals within the range of frequen­cy coverage and filters out-of-band signals.
The signals from the ANTunit via J1 (pin 2) pass through the low-pass filter (L2, L3, C3–C7) and high-pass filter (L4, C8–C10). The filtered signals are amplified at the RF ampli­fier (IC1) and are then enter another low-pass filter (L6, L7, C15–C19) and notch filter (L24, L25, C111, C112) to sup­press unwanted signals. The filtered signals are applied to the mixer circuit.
3-6-3 MIXER CIRCUIT (MAIN UNIT)
The mixer circuit (IC2, L8, L9) is a double-balanced mixer which converts the received signal to a fixed frequency of the IF signal with an LO frequency.
The signals from the RF circuit are mixed with the LO signal at the mixer circuit (IC2, L8, L9) to produce a 455 kHz IF sig­nal.
3-6-4 IF CIRCUIT (MAIN UNIT)
By changing the LO frequency, only the desired frequency will pass through the IF filter at the next stage of the mixer.
The IF signal from the mixer circuit is amplified at the IF amplifier (Q1) and is applied to a ceramic filter (FI1) to sup­press out-of-band signals. The filtered signal is applied to the FM IF IC circuit (IC3).
3-6-5 DEMODULATOR CIRCUIT (MAIN UNIT)
The FM IF IC (IC3) contains the limiter amplifier, detector cir­cuits, etc.
The IF signal from the IF filter is applied to the limitter ampli­fier section of IC3 (pin 5). The amplified signal is mixed with a 456.2 kHz signal from CPU IC (IC12) to produce a 1.2 kHz detector signal for demodulation the IF signal into AF signals.
AF signal from FM IF IC (IC3, pin 9) passes through the low­pass filter (IC4a, IC4b). The filtered signal is amplified at the AF amplifier (Q4) and is applied to the CPU (IC12).
3-6-6 REFERENCE OSCILLATOR CIRCUIT
(MAIN UNIT)
The reference oscillator circuit generates the reference fre­quency, and the signals are applied to the DDS IC and CPU.
The generated reference signal from the reference oscillator (X1: 14.5984 MHz) is amplified and divided at the buffer amplifier (IC7). The divided signal (7.2992 MHz) is applied to the DDS IC (IC6) and CPU (IC12) via the amplifiers IC5, IC10 respectively.
3-6-7 LO CIRCUIT (MAIN UNIT)
The LO circuit generates the LO frequency, and the signals are applied to the mixer circuit.
The generated LO signal is output from IC6 and passed through the D/A converter (R26–R45), low-pass filter (L15, L16, C55–C59) and high-pass filter (L17, C60–C62). The fil­tered signal is amplified at the buffer amplifier (Q2) and then is passed through the low-pass filter (L18, L19, C65–C69). The filtered signal is applied to the mixer circuit.
3-7 PORT ALLOCATIONS
3-7-1 FP-561
SUB CPU (LOGIC UNIT; IC22)
Outputs Tx (50 kHz/200 kHz) pulse sig­nals to IC1 (pins 1, 3).
Outputs control signal for LCD back­light.
Outputs control signal for the LCD con­trast
A/D input port for the received signal strength indicator voltage.
Input port for serial signal from the GPS unit via the buffer amplifier (IC23, pin 12).
Outputs serial signal to the buffer amplifier (IC23, pin 3) for the GPS unit.
Input port for serial signal from the NMEA/DGPS units via the analog switch (IC41, pin 14).
Outputs serial signal to the analog switch (IC41, pin 2) for the NMEA/DGPS units.
Ship speed input port from the photo coupler (IC7, pin 7) on the MAIN unit.
Outputs beep audio to the buzzer cir­cuit (Q4, SP1) on the SW unit.
Outputs receive frequency switching signal for the analog switch (IC16).
Outputs trasmit triger signal for the dri­ver circuit (IC2, pins 2, 6) on the MAIN unit.
1
3
4
7
16
17
18
20
72
74
77
80
TXSIG
INV
CONT
RSSI
GPSI
GPSO
NMEAI
NMO
SPD
BEEP
LOC
TXTRG
Pin Port
Description
number name
FP-561
MAIN CPU (LOGIC UNIT; IC1)
3-7-2 RD-200
CPU (MAIN unit; IC12)
3 - 5
Outputs serial clock signal for the LCD. Outputs vertical synchronizing signal
for LCD. Outputs horizintal synchronizing signal
for LCD. Outputs red color signal for LCD. Outputs blue color signal for LCD. Outputs green color signal for LCD. Outputs RX pass-bandwidth control
signal for the RSSI controller (Q25).
High : While narrow
73 86
88 92
93 94
172
DTCK
VSYNC
HSYNC
RED
BLUE
GREEN
DEPCONT
Pin Port
Description
number name
Input port for the reset signal from the reset circuit (IC11, Q5).
8 bit D/Aoutput ports for the bar anten­nas control signals.
Outputs reset signal for the DDS IC (IC6).
Outputs serial clock signal for the DDS IC (IC6).
Outputs serial data signals for the DDS IC (IC6).
Outputs strobe signals for the DDS IC (IC6).
Outputs clock signal for the EEPROM IC (IC13).
Inputs/outputs serial signal for the EEPROM IC (IC13).
Outputs chip select signal for the EEP­ROM IC (IC13).
Input port for NMEA signal or clone signal from the NMEA connector (J3).
Outputs NMEA signal to the NMEA connector (J3).
10
25–32
39
40
41
42
43
44
45
48
49
RESET
TUNE0–
TUNE7
DRES
CLK
DATA
STRB
ESCK
ESIO
ECS
RXDO
TXDO
Pin Port
Description
number name
4 - 1

SECTION 4 ADJUSTMENT PROCEDURES

4-1 PREPARATION
REQUIRED TEST EQUIPMENT
CONNECTION
EQUIPMENT
DC power supply
Frequency counter
DC voltmeter
Spectrum analyzer
GRADE AND RANGE
Output voltage : 11–30 V DC Current capacity : 3 A or more
Frequency range : 0.1–10 MHz Frequency accuracy: ±1 ppm or better Sensitivity : 100 mV or better
Input impedance : 50 k/V DC or better Frequency range : At least 10 MHz
Spectrum bandwidth: ±100 kHz or more
EQUIPMENT
Oscilloscope
Tracking generator
Standard signal generator (SSG)
GRADE AND RANGE
Frequency range : DC–20 MHz Measuring range : 0.01–10 V
Frequency range : 100 kHz–100 MHz Output level : 1 mV to 71 mV
(–47 dBm to –10 dBm)
Frequency range : 10 kHz–100 MHz Output level : 0.1 µV–32 mV
(–127 to –17 dBm)
TRANSDUCER
FP-561 Marine Ploter/Sounder
EX-1622
Transom-
type
transducer
(Option)
Coupler
Standard signal
generator
EX-1010
Through-hull type
transducer
(Option)
Coupler
R
R
D
D
FP-561 SSG
D: 1N4002 R: 100 (3 W)
DGPS
RD-200 Differential GPS receiver
Standard signal
generator
Spectrum
analyzer
Tracking
generator
Frequency
counter
A coupler should be prepared by each user. The coupler will protect the signal generator from transmitter power.
RD-200 adjustment
Ground
Battery 11 to 30 VDC
Red: + Black: –
PWR
GND
4 - 2
4-2 FP-561 TRANSMITTER ADJUSTMENT
OUTPUT POWER
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
12• Connect a transducer to the
[TRANSDUCER] connector.
Mode : [SOUNDER]
Frequency : [H]
Depth range : 640 m
Frequency : [L]
MAIN Connect an oscillo-
scope between pin 3 and pin 5 of J2.
880–1320 Vp-p at maximum wave point
Verify
Verify
4-4 FP-561 WATER TEMPERTURE ADJUSTMENT
WATER TEMPERATURE
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1 Connect a 10 k resistor
between pin 6 and pin 7 of the [TRANSDUCER] connector J2.
Display 25.0 ˚C LOGIC R131
*This output level of the standard signal generator (SSG) is indicated as SSGs open circuit.
4-3 FP-561 RECEIVER ADJUSTMENT
RECEIVE SENSITIVITY
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
2
3
Mode : [SOUNDER]
Frequency : [H]
Depth range : 5 m
STC : [1]
Connect a standard signal gener-
ator to the [TRANSDUCER] con­nector J2 via the coupler and set as:
Fequency : 200 kHz Level :
1 mV (–47 dBm)
Frequency : [L]
Set an SSG as:
Frequency : 50 kHz Level :
1 mV (–47 dBm)
Set an SSG as: Frequency : 50 kHz Level :
100 mV (–7 dBm)
MAIN Connect a DC volt-
meter or oscillo­scope to the check point RSSI”.
Maximum DC voltage MAIN L1
L6
R99
4 - 3
RSSI
Pin 3 Pin 5
R99 L1 L6
Receive sensitivity check point
Receive sensitivity adjustment
Output power check point J2
Pin 6 Pin 7
Water temperature pre-setting J2
MAIN unit
R131
Water temperature adjustment
LOGIC unit
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