Radar 1622 Service Manual

MARINE RADAR MODEL

MODEL 1622

C

Yo u r L o c a l A g e n t / D e a l e r 9-52, Ashihara-cho, Nishinomi ya, Japan Te l e p h o n e : Te l e f a x :

0 7 9 8 - 6 5- 2 111 0798- 65- 4200

A l l r i g h t s r es e r ve d .

Printed in Japan

PUB. No. SME-34520-B (KAOK)

MO D EL 1622

FIRST

ED ITIO N: FEB. 20 00 B: S E P. 1 2 , 2 0 0 0

CONTENTS Chapter 1. General 1.1 Display Unit .................................................................. 1 1.2 Scanner Unit.................................................................. 2

Chapter 2.

Block Description

2.1 General .......................................................................... 3 2.2 Display Unit .................................................................. 4 2.3 Scanner Unit.................................................................. 5 2.4 Functions of Each Circuit board ................................... 6

Chapter 3.

Adjustment

3.1 Display Unit .................................................................. 13 3.2 Scanner Unit.................................................................. 14

Chapter 4.

Maintenance

4.1 Maintenance Parts ......................................................... 15 4.2 Replacement of Major Parts.......................................... 16 4.3 How to change system program.................................... 21

Chapter 5.

Troubleshooting

5.1 Maintenance Menu........................................................ 22 5.2 Error Messages.............................................................. 23 5.3 Troubleshooting Matrix table........................................ 23 5.4 Test points on Each Board ............................................ 25

Exploded View ................................................................. D-1 Schematic Diagram....................................................... S-1 Electrical Parts List....................................................... E-1

Chapter 1. 1.1

General

Display Unit

All parts are sandwiched together and fastened by four screws and three connector fixing nuts from the rear side.

Resin cover Shield cover DU Board LCD Display PNL pcb Panel cover

Figure 1-1.

Construction of Display Unit

Protection against EMI Many radars use conductive paint inside their covers to protect against EMI (Electro Magnetic Interference). This model, however, is not painted, but has a shield cover over the DU board for protection against EMI.

Waterproofs The display unit conforms to the IEC standard IPX5; namely, waterproof against water jets. Even the small hole to the right of the arrow keys, which is where the aural alarm is released, is waterproof. A “breathing sheet” between the panel cover and the buzzer allows air to pass and prevents water from being drawn into the enclosure during atmospheric pressure changes.

1

1.2 Scanner Unit

1.2

Scanner Unit

The scanner unit mainly consists of INT Board (03P9271), IF AMP Board (03P9269), MIC (RU9458), radiator, antenna motor, reed switch which generates HD signal, magnetron, and MD Board (03P9270). Power to Scanner Unit The ship’s mains is directly supplied to the scanner unit, where various voltages are made. Therefore, if the antenna cable length of 12VDC set is 20m or more, scanner rotation may be abnormal due to voltage drop. If the antenna cable is more than 20m, modify the unit to 24VDC set.

Antenna Cable Both the scanner unit and the display unit have a CPU. They communicate with each other on two lines, “COM (HOT)” and “COM (COLD)”. The result: the number of lines in the cable was reduced.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

GAIN STC TUNE TUN.IND MOTOR(+) MOTOR(-) BP HD P/L-A P/L-B TRIGGER VIDEO GND +12V -12V GND SHIELD

Conventional radars

Figure 1-2

COM (HOT) COM (COLD)

1 2

BP/HD

3

TRIGGER VIDEO GND S.M. (HOT) S.M. (COLD) GND SHIELD

4 5 6 7 8 9 10

MODEL 1622

Antenna Cable

2

Chapter 2. 2.1

Block Description

General

The CPU on the DU board of the display unit communicates with the CPU on the SD board of the scanner unit in RS-422 format.

Radiator Ship’s mains

Transceiver MD Board

Display Unit DU Board

Video signal BP/HD

INT Board

IF Board

Communication (H.C)

Trigger

Signal processor & power supply

LCD

Ship’s mains (H.C)

PNL Board

Scanner Unit

Figure 2-1.

Simplified Block Diagram

The trigger pulse from the DU board is modulated at the MD board to oscillate the magnetron. The echo received by the antenna is amplified by the IF amplifier and is fed to the DU board as a video signal. The DU board converts the analog signal to digital signal and processes to display it on the LCD. Bearing pulse (BP) and heading signal (HD) are generated in the scanner unit and received by the DU Board in the display unit.

3

2.2!Display Unit

2.2

Display Unit

The display unit features that; 1) DU Board produces LCD back-light voltage of 210VAC. 2) An artificial echo signal (instead of the video signal) can be selected. 3) The interface communicates with the scanner unit in RS-422 format. The TX trigger is made at the gate array (!) and is fed to the scanner unit. The received video signal is A/D converted and is sampled at the gate array (!). The echo on each sweep is stored on the V-RAM via the gate array ("). Upon receiving the heading pulse, the stored data are output to the LCD in four shades of gray, according to echo strength.

From Scanner To Scanner

FTC

VIDEO

A/D CONV.

U107,C104 R112

U101

TRIGGER

GATE ARRAY ( ) U111

EEPROM U105

CPU U108 From NAV AID To Scanner From Scanner To Scanner

NMEA RS-422

I/F I/F

U114 U126

GATE ARRAY ( )

ROM U115

U108

RAM U109

U119

BP-HD

GDC U112 ADJ Ship’s Mains

DC-DC CONV.

12V 6V

U6,Q6,T1

22V

DU Board 03P9268

Figure 2-2.

U113 U116

5V

FILTER L1,L2

V-RAM

PANEL Board PNL9194

Back-Light volt. AC210V

R-C CONV. Q52,Q53,T2

Block Diagram of Display Unit

4

LCD 03S9461

2.3!Scanner Unit

2.3

Scanner Unit

The scanner unit features that; 1) The powers supply circuit for the scanner unit is provided on the SD board. 2) The SD board in the scanner unit communicates with the display unit. 3) Auto-gain and auto-STC circuits make operation easy. The TX trigger from the display unit is modulated and oscillates the magnetron. The received echo is fed to the MIC and is amplified at the IF amp. The output is divided two lines: one is led to the display unit and the other is applied to the interface for auto-gain and auto-STC functions.

IF Board 03P9269

INT Board 03P9271 VIDEO

IF

MIC TUNE

INTERFACE

COM Display Unit

GAIN

IF AMP

A/C SEA

Auto Gain Auto STC Auto Tune Communication Motor Drive

RU-9458 (U801)

TUNE

Circulator

ANT. 03P9267

BP/MD

M

TRIGGER

RM-9455 (B801) SHIP’S MAINS

MODULATOR

12V 5V

POWER SUPPLY

Magnetron E3588 (V801)

8V TX-HV

MD Board 03P9270

Figure 2-3.

Block Diagram of Scanner Unit

5

2.4!Functions of Each Circuit board

2.4

Functions of Each Circuit board

2.4.1 Display Unit The display unit consists of DU board (03P9268), PANEL board (PNL9194), and LCD indicator (03S9461). PANEL Board Mounted on this board are the operating keys, panel-illuminating LEDs, and electrical buzzer, constituting the man-machine interface. DU Board (03P9268) The reference oscillator U125 is a quartz oscillator which generates an accurate and stable reference frequency signal. This reference frequency signal is the source of the transmission trigger, the clock for video signal processing in the display unit, the time-base signal, the reference clock for LCD display, the reference clock for CPU, and so on. According to the distance range selected in the panel operation, CPU computes the ratio of dividing the reference frequency and sends the data to the gate array U111 (radar signal processing circuit). Based on the data, U111 creates the transmission trigger from the reference frequency signal. This radar intentionally varies the pulse repetition frequency of the transmission trigger to prevent the interference signals from other radars. The IF video signal from scanner unit inputs to the video circuit on the DU board. The video circuit includes FTC circuit that rejects the reflecting signals from the rain and snow. CPU switches on or off the FTC function according to the panel operation. The IF video signal is converted by a A/D converter to the three-level digital signal, which inputs to the gate array U111 (radar signal processing circuit). In U111, the input digital IF video signal is sampled with the sampling clock corresponding to the range setting. Further in U111, when the interference rejector is turned on in the menu, each receiving video signal is correlated with the corresponding transmission to reject the interference signals from other radars. The video signal output from U111 is written in the VRAM U116 for the display. The antenna bearing signal and heading signal are input to CPU from scanner unit. The heading correction data, obtained at heading alignment (instllation menu) is stored in EEPROM U105, and CPU computes the correct direction of the antenna, using the correction data. The data to correct the difference between the transmitting and receiving timing is obtained at TX time delay adjustment (installation menu) and is also stored in EEPROM U105. The correction is carried out in U118.

6

2.4!Functions of Each Circuit board

While the target scanning system of the radar uses the method of R#$ coordinates, LCD display of this radar employs the method of X-Y coordinates, which is similar to so called TVsweep method. The sweep time of the LCD display is independent of that of the radar scanning system, so VRAM U116 is provided as the interface between them. In order to write the radar echo signal received after every transmission trigger on VRAM U116, CPU converts the antenna bearing signal $ into the values of SIN$ and COS$ and send them to U118. U118 further converts them to X-Y coordinates of RSIN$ and RCOS$. These values are used as the address to write the radar video signal on VRAM U116. VRAM U116 also holds the past video signal for display for a trail time specified by the panel operation. According to the settings of the operating panel, CPU writes on VRAM U113 the display data such as the fixed range rings, EBL, VRM, cursor, guard alarm range, and scale of azimuth angle. Further, CPU also writes on VRAM U113 the character and numbers to be displayed on the screen. For writing these data, GDC U112 is used. The data writing/reading onto/from the VRAM is carried out by U118 in time-sharing method. The display data are read out from VRAM and sent to LCD display using GDC U112. The signals for controlling scanner unit (including the transceiver) are converted to RS-422 serial signals in U119 and sent through a balanced RS-422 cable so that the signals may not be affected by external noise. The control signals include those for switching the transmission on/off, adjusting the transmitting pulse width and IF amplifier gain, and adjusting STC. The information from the navigational aid is received through U114 and U126 to be displayed on the radar screen. The unit requires power supply source ranging 10.2 to 31.2 V DC. This voltage meets the voltage requirement for ships: 10% lower and 30% higher than 12V/24V ship’s mains. This DC power is supplied through noise filters, L1, and L2, to the pulse-width-controlled DC-DC converter mainly consisting of U6, Q6, and T1, which generates the stable voltages of +5 V, +12 V, -6V, and -22 V that are needed in display unit. The voltage +5 V is mainly used for the digital circuits, +12 V and -6 V are used for the video and other analog circuits, and –22 V is for the LCD display. The DC-AC inverter consisting of Q52, Q53, and T2 generates AC 210 V which is used for the backlighting of the LCD display. If the power supply is reverse-connected to the radar, the reverse-polarity protector activates so that the circuit breaker is tripped or fuse is blown off to prevent the damage to the unit. The power supply circuit contains low- and high-input voltage protectors.

7

2.4!Functions of Each Circuit board

2.4.2 Scanner Unit INT Board (03P9271) INT board contains: one-chip CPU U3, that includes the RAM, ROM, and analog ports; U5 including I/O ports the stepping motor drive circuits; and U7 including the A/D converter which outputs tuning, gain, and STC control signals. The output from U7 is used to control the STC and gain of the IF amplifier and the frequency of microwave local oscillator for MIC. The operating conditions of the radar that have been set on the operating panel of the display unit are sent to the CPU U3 on the INT board through the RS422 communication line. The CPU U3 controls the stepping motor drive circuit U5 which drives the stepping motor to rotate the antenna. The antenna azimuth signal is created in the stepping motor drive circuit and mixed with the heading signal (S801), and sent to the display unit. In order to change the transmitting radar pulse length according to the selected range, the pulse width information is sent from the INT board to the modulation circuit on the MD board. There are the automatic mode and manual mode to adjust the gain of the IF amplifier. In the automatic mode, CPU U3 monitors the video signal from the IF amplifier, and the monitored signal inputs to the A/D converter U7 through the I/O port U5, and the A/D converter output controls the IF amplifier gain. In the manual mode, the signal set by manual setting inputs to the A/D converter, and the A/D converter output controls the gain of the IF amplifier. This radar employs an automatic tuning system in which the main bang signal from the IF amplifier is amplified and inputs to CPU U3 as the signal indicating the tuning level. The CPU U3 controls the output of the A/D converter U7 so that the tuning indication level may become maximum. The adjustment of STC is also carried out in the same way as the gain adjustment.

IF Amplifier Board (03P9269) The IF amplifier, the intermediate frequency of 60 MHz and band width of 7 MHz, consists of Q1, U1, U2, and a buffer Q4. This board includes the gain and STC control circuits consisting of Q2 and Q3. Another circuit, consisting of Q5 to Q10, detects the main bangs to indicate the tuning level.

8

2.4!Functions of Each Circuit board

RU-9458 Module This module includes the circulator and MIC circuit that converts the microwave frequency to the intermediate frequency. The circulator switches between the transmitting and receiving microwave circuits so that the transmitting radio energy may be efficiently transmitted to the antenna without leaking to the receiver side and the receiving radar signal from the antenna may be sent with efficiency to the receiver without leaking to the transmitter side. The receiver side is provided with the waveguide to coaxial converter, diode limiter, and balanced mixer. The diode limiter, set after the converter, protects the balanced mixer from the excessive input power, and the mixer converts the input microwave signal to the 60-MHz IF signal. A voltage-controlled FET oscillator outputs the signal to the mixer.

MD Board (03P9270) The power supply circuit and modulation circuit of the scanner unit (transceiver) are mounted on the MD board. There are provided two DC-DC converter power supply circuits: one supplies –6 V, +5 V, and +12 V to the circuits except the magnetron and the other supplies power to the magnetron heater and TXHV. The two DC-DC converters generate stable voltage outputs with Q803 and Q832 driven by the pulsewidth controllers U801 and U805. The magnetron current, -6 V, +5 V, +12 V, +8 V (magnetron heater voltage), and TX HV can be checked at the check points TP804 on the board. In the magnetron modulation circuit, the transmitting pulse waveform is determined by the oneshot multivibrator U851 which is triggered by the transmitting trigger pulse. The pulsewidth of the multivibrator is set by the time constant which is determined by the pulsewidth control signal from INT board. The output of the multivibrator inputs to the FET switching transistor Q857 through transistor buffer Q853 and variable resistor VR851. The VR851 presets the voltage for driving Q857 to determine the magnetron output power.

9

2.4!Functions of Each Circuit board

VIDEO

TRIG

U4 Amplifier

Q1 Buffer

Antenna motor drive signal

Q3 Q6 Buffer RS422 U1 U5 I/O PORT

BP

Q11 Q12 Q13 Mixer

BP/HD

HD Marker

U3 CPU

Buffer

U7 D/A

Q14

GAIN Control

Q15

STC Control

Q16

Tune Control

PL B PL A TUNE IND

Figure 2-4.

Block Diagram of INT Board (03P9271)

10

Figure 2-5.

11

Block Diagram of MD Board (03P9270)

TRIG

PL-B

PL-A

Ship’s mains

U851 Pulse width controller

Pulse width decoder

Q851,Q852

Q801 Q802 Q805 CR804 Error detector

Q801 Pulse width controller

Q803

6V

Q801

12V MAG.CUR.

Buffer

Q853

5V

TP804

VR801

CR832

CR831

VR851 Q855 Q856 Buffer

8V HV.CHECK

Q857

T851 Medulation transformer

U805 Inverter driver

Q832

T802

U804 Regulator

6V

5V

CR855

L851

CR836

CR837 CR838

12V

MAG.CUR.

TUNE GATE

TX HV

2.4!Functions of Each Circuit board

8V

2.4!Functions of Each Circuit board

STC Control

Q2 Q3 GAIN STC Controllers

GAIN Control Trigger

VIDEO Output

Q4 Buffer

U2 3rd IF AMP Video detector

60MHz IF LC filter

U1 2nd IF AMP

60MHz IF LC filter

Q5 to Q10 Tune level detector

TUNE GATE input TUNE IND output

Figure 2-6.

Block Diagram of IF AMP Board (03P9269)

12

Q1 1st IF AMP

60MHz IF-IN

Chapter 3.

Adjustment

DANGER Both display and scanner units use high voltage electricity, which endanger human life. Precautions must always be exercised when reaching inside the unit. (1 kVAC for LCD backlighting and 300 VDC for TX)

3.1

Display Unit

Voltage check Remove the resin cover, and measure each voltage. It is not necessary to open the shield cover on the DU board. Table 3-1 Item

Setting

"5 V

TX #8NM$

"12 V

Test point

Ratings

%TP5#&$ TP4#"$

4.95'5.05 Vdc

ST-BY

%J1#5#&$ J1#7#"$

11.2'12.4 Vdc

&22 V

ST-BY

J1#10#"$%J1#5#&$

&22.9'&20.7 Vdc

&6 V

ST-BY

%J1#5#&$ J1#9#"$

&6.0'&5.0 Vdc

J1

TP4 ("5V)

VR2

Figure 3-1. Test points on DU Board

13

Adjuster VR2

3.2!Scanner Unit

3.2

Scanner Unit

Voltage check Open the radome, and measure each voltage with the modulator cover removed. Table 3-2 Item

Setting

Check point

Rating

"12 V

ST-BY

TP804#3#"$% TP804#4#&$

11.9'12.1 Vdc

"8 V heater volt.

ST-BY

TP804#6#"$% TP804#4#&$

7.8'8.2 Vdc

TX-HV (divided)

TX(Note) (3NM)

TP804#7#"$% TP804#4#&$

8.5'9.35 V

Magnetron current

TX(Note) (3NM)

TP804#5#"$% TP804#4#&$

2.8'3.6 V

Adjuster VR801

VR851

Note) To transmit with scanner rotation suspended, turn on the power while pressing and holding down the%&'key. After one minute, the radar is in transmission mode.

VR851

VR801

TP804

Figure 3-2. Test points on MD Board

14

Chapter 4.

Maintenance

This unit is designed for board level maintenance, not component replacement.

4.1

Maintenace Parts Table 4-1 Maintenance Parts Parts

Type

Code No.

DU Board PNL Board MD Board IF Board INT Board LCD Unit MIC Magnetron

03P9268 PNL9194 03P9270 03P9269 03P9271 DG52Y-5MC S-RX50/RU-9458 E3588

008-499-680 008-481-680 008-499-650 008-499-640 008-499-660 000-142-310 000-142-269 000-142-270

Antenna Motor Fuse

RM-9455 FGBO-A, 5A, 125 V

000-142-252 000-549-064

Program ROM Radome cover Radome packing

PROM0359158101 RSB-0060 03-118-3203

008-499-730 008-440-720 100-185-430

15

Remarks

U115, DU Board

4.2!Replacement of Major Parts

4.2

Replacement of Major Parts

Removing display unit cover and shield plate 1. 2. 3. 4. 5. 6.

Loosen and remove the nuts from three jacks at the display unit cover. Remove four screws fixing the display unit cover. Remove the display unit cover, the shield cover will be exposed. Of the two shield tapes attached to the shield cover, remove the shorter one. Remove four screws fixing the shield case. Lift up the shield case to expose the board.

Shield tape Figure 4-1.

Display Unit, rear view

Figure 4-2.

Display Unit, cover removed

Reassembling 7. Fix the shield case to the board with four screws. 8. Attach the shield tape (shorter one) supplied to the same position as before.

!" #$%&'()*+,&

Shield case Space P.C. Board

P.C. Board

Chassis

Chassis Figure 4-3.

How to run shield tape

9. If the longer shield tape came off during work, exchange it with new one. Parts Name Shield tape Shield tape

Type DK-102-35/L=45 DK-102-19/L=110

Code No.

10. Make sure that each of three jacks on the board is fitted with a gasket. 11. Put the display unit cover back in position. 12. Set and tighten three nuts and four screws to fix the jacks and the display unit cover.

16

4.2!Replacement of Major Parts

Cover LCD Assy. Round side Panel(E) 03-135-1021

O-ring (large) O-ring (small)

A View from A

LCD VH connector wires from LCD

Never run wires beyond this line.

Figure 4-4.

(P)DU 03P9268

LCD DG 052Y-5MC

J3

Shield plate 03-146-1002

J2 PCB fixing plate, 03-118-1001

P3, Flat cable P2, 4P VH connector

Figure 4-5.

17

4.2!Replacement of Major Parts

Panel packing 03-118-1006

(P)PNL PNL9194

Rubber key(E) 03-135-1022 PW sheet 86-009-1022

Figure 4-6.

18

4.2!Replacement of Major Parts

STS Belt and Motor 1. Unscrew four M3(8 screws (() fixing the bearing retainer. 2. Remove the radiator assembly. 3. Replace the belt (or motor) with new one. No tension adjustment of the belt is necessary. 4. Assemble the unit by reversing above steps.

M3

6 SCM3

Radiator Assy. Driving Pulley 03-146-3304 M3

B801 Motor RM-9455

M3

8 2pcs.

8 4pcs.

Connector Driver Pulley

Fix at the same time.

Bearing Retainer STS Bert 40S2M266UG

two dowels

Use this hole to loosen the screw fixing the bearing retainer.

dowels B

View from B STS Belt

Driving pulley Driver pulley

Figure 4-7.

19

Driver pulley, top view

4.2!Replacement of Major Parts

Magnetron Handle the magnetron, taking the followings into account. 1. Use a non-magnetic screw driver to dismount and mount the magnetron. 2. Keep the magnetron 25mm away from the metals. 3. Never pull the magnetron lead wires.

MIC See figure below. M4

20

Remove shorting plug. Dowels

U801 S-RX50

Dowels

M4

IF 03P9269

V801 Magnetron E3588

J810

J808

Figure 4-8.

20

10 4pcs.

4.3!How to change system program

4.3

How to change system program

PROM, U115 on the DU Board stores system program. Change the ROM to update the program.

Raw ROM Type : Program No.:

M27C1001-10F1 035915800X

Replacing program ROM 1. 2. 3. 4.

See page 18 to gain access to the DU board. Remove the lock band of the program ROM (U115) Detach the program ROM from the socket by using a dedicated tool or a screwdriver. Insert the update ROM (0359158104) to the socket.

U115(PROM)

5. Secure the ROM by using the lock band previously removed.

Figure 4-9.

DU Board (03P9268)

How to read program number 1. 2. 3. 4.

Turn the radar on. Wait until the initial screen appears, then press and hold UP and DOWN keys together. In about 10 seconds, the maintenance menu as shown below will appear. Press MENU key to close the menu.

21

Chapter 5.

Troubleshooting

The unit does not provides self-test function. This chapter mainly describes how to check each block.

5.1

Maintenance Menu

To open the maintenance menu; 1. Turn the radar on. 2. Wait until the initial screen appears, then press and hold UP and DOWN keys together. 3. In about 10 seconds, the maintenance menu as shown below will appear. 4. Press MENU key to close the menu.

Figure 5-1. Maintenance Menu

1) Reading program Number: The program number appears at the upper left corner. 2) When connecting M1621MK2 scanner unit The scanner unit of M1621 and M1621MK2 can be connected to the display unit of M1622. For this combination, the MODEL in the maintenance menu must be set to “1621/M2” which provides magnetron warm-up time of 90 seconds. The use in wrong setting may shorten the life of the magnetron or damage the magnetron. The scanner unit of the M1622 is designed for the warm-up time of 60 seconds. 3) Selecting “Demo display” Select “Demo” to display the preprogrammed echo on the screen. 4) Receiving signal (Nav data) The sentence of nav data receiving from the navaid is shown by reversed video.

22

5.2!Error massages

5.2

Error Messages

The following messages appear to call the operator’s attention to missing heading or bearing pulses. Check the scanner cable for damage or disconnection when these messages appear. Table 5-1.

Error Messages

Message HD-SIG-MISS BP-SIG-MISS

5.3

Meaning Heading pulse is not applied to the CPU on the DU board. The heading mark disappears. Bearing pulse is not applied to the CPU on the DU board. Radar automatically changes from TX to ST-BY mode.

Troubleshooting Matrix table

The troubleshooting matrix table on the next page helps the service technician to quickly identify defective pcb or block. To use the table, locate the symptom in one of the three columns of the table. Possibly defective circuits and their likelihood of defectiveness, indicated by a circle, star or triangle, corresponding to 70 to 80%, approximately 20% and a few percent respectively, are listed in each column. Numeral inside circle shows degree of possibility; the smaller the number, the higher the possibility. Note) Before consulting the table, check the ship’s mains (input voltage at J1351#1(+) and #2(-) of the display unit: 10.2 to 31.2VDC) and the power fuse.

23

24

Fuse#5A$

Motor and belt

MIC

Magnetron

INT PCB 03P9271

MD PCB 03P9270

IF PCB 03P9269

LCD Display, DG52Y-5MC

PNL PCB 03P9194

DU PCB 03P9268

!!Check Point

!!!!!!!!Symptom

)

,

1

+

)

2

1) Power can not be supplied. 2) Power is supplied but nothing appears on LCD. 3) Scanner does not rotate.

*

)

,

3

)

4

,

)

*

5

)

*

+

6

4) Marks and legends do not appear. 5) Marks and legends appear, but no noise nor echo. 6) Marks, legends and noise appear but no echo.

)

7

,

)

+

*

+

8

*

)

9

7) Incorrect target bearing. 8) Poor sensitivity. 9) Keyboard is pressed but no response.

5.3! Troubleshooting matrix table

5.4!Test points on Each Board

5.4

Test points on Each Board

1) DU Board)03P9268* Test point

Check Item

Ratings

Remarks

TP1

DC&

TP2/TP1

"9V

8.7'9.9Vdc

U3-#5

TP3/TP1

Q6-D

21.7'29.4us

Switching Waveform (Primary)

TP4/TP1

"5V

4.8'5.2Vdc

Adjuster: VR2 Same reading at between J1#2(+) and J1-#5(-)

TP5 TP7/C55

GND INV

GND 11.2'14.5V-68'92kHz

TP11/TP5

XTAL

36.85'40.85kHz

TP12/TP5

BLCK

8.1725'10.7125kHz

TP13/TP5

TRIG

TP14/TP5

BP

TP15/TP5

HD

TP16/TP5

VIDE

V=9.0'12.0. T=6.0'10.0us V=4.0'5.2V T=5.5'6.5ms V=4.0'5.2V T=2.5'2.9S Same wave as TP602, IF Board (03P9269)

DC-AC Inverter, Primary BLCK, U118-#87 TX Trigger, U111-#60 Bearing, U118-#138 Heading, U118-#137 Video, DJ1-#6

2) MD Board)03P9270* Test point

Check Item

Ratings

Remarks

TP801/TP802

+9V

8.7'9.9Vdc

TP803/TP802

VD1

34'46kHz

TP804-1/ TP804-4

-6V

-6.9'-5.5Vdc

TP804-2/ TP804-4

+5V

4.75'5.25Vdc

TP804-3/ TP804-4

+12V

11.9'12.1Vdc

Adjuster: VR801

TP804-5/ TP804-4

Magnetron Current

2.8'3.6Vdc

Adjuster: VR851, TX, 3nm Range

TP804-6/ TP804-4

+8V

TP804-7/ TP804-4

ST-BY/TX

7.8'8.2Vdc 8.5'9.35Vdc (8.1'9.1Vdc)

ST-BY (TX-6nm)

TP805/TP806

+12V

11.9'12.1Vdc

TP807

GATE2

Waveform 2

TP808

VD2

Waveform 3

TP811

TRIG

Waveform 1

TP812

GND

TP813

TX. PW.

Waveform 4

Pulse transformer drive signal

TP814

GATE1

Waveform 5

Gate signal of switching FET

Save wave as VD2

Gate signal of switching FET

Not SHIP’S MAIN COLD

25

5.4!Test points on Each Board

3) IF Board)03P9269* Test Point TP601 TP602 TP603 TP604

Check Item IND ECHO AGC IF

Ratings 2.5Vdc Waveform 6

Remarks

Same as STC waveform Not measurable

4) STC Waveform Condition ; TX, STC voltage (J809 #9) adjusted to 3.4 to 3.6 V manually. Test Point ; Between R46 and R47. Ratings ; V1+3.1,3.5V, V2=0.8,1.0V, V3=0.2,0.4V, T1=40,50us

26

5.4!Test points on Each Board

-./001-23"45 678790:)6 .;9/4:-, .-!" #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-,

;+E&FBGH/

-./:I1"J-KC5 678790:)6 F9L/MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-,

;+E&FBGH0

-./:/16UC5 67879CV)6 F9L/MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& V4::)6D)0:4:-,

;+E&FBGH1

27

5.4!Test points on Each Board

-./0L1-