Samyung STR-6000A User manual

SERVICE MANUAL
SERVICE MANUALSERVICE MANUAL
SERVICE MANUAL
MODEL
MODELMODEL
MODEL STR
STRSTR
STR-
--
-6000A
6000A6000A
6000A

1. INITIAL SETTING
1. INITIAL SETTING1. INITIAL SETTING
1. INITIAL SETTING
1
11
1-
--
-1
1 1
1 POWER
POWER POWER
POWER PART
PART PART
PART TYPES
TYPES TYPES
TYPES
OUTPUT VOLTAGE IS 13.6V. CURRENT SHOULD BE OVER 7A.
POWER
TYPES INPUT POWER OUTPUT POWER
SP-580AD
SP-6000AD
AC 110V / 220V
DC 13.6V 7A
DC 24V
SP-670DC DC 24V DC 1.6V 7A
POWER CABLE
1. WHTIE ( + ) DC 13.6V 4. NC (BK)
2. BLACK ( - ) 3. NC (BK)

1
11
1-
--
-2. GPS DATA
2. GPS DATA 2. GPS DATA
2. GPS DATA INPUT
INPUTINPUT
INPUT
NMEA0183 TRANSMITTING SPEED IS 4800BPS. LATITUDE, LONGITUDE, TIME ARE USED.
ALRAMS ARE CREATED, WHEN POSITION DATA ARE NOT RECEIVED, OR POSITION
INFORMATION PASS OVER 4 HOURS IN CASE OF MANUAL INPUT. POSITION
INFORMATION, WHICH HAVE NOT BEEN RENEWED OVER 23 HOURS, ARE DELETED. IF
GPS DATA ARE NOT INPUT FOR MORE THAN I MINUTE, ALARMS ARE CREATED. IF GPS
DATA ARE INPUT AGAIN, ALRARMS ARE STOPPED.
(NMEA0183 INPUT FORMAT & TYPES)
$GPGGA,065501,3506.3023,N,12905.6429,E,1,07,001.3,00005,M,0000,M,,*41
$GPGGA,032007,3505.10,N,12902.47,E,1,00,1,0,M,,M,,
$GPGGA,044610.00,3505.2139,N,12904.2867,E,1,06,05.4,,M,,M,,*63
$GPRMC,123456,A,3505.00,N,12902.00,E,1.0,0.0,221199,0.0,E*00
$GPRMC,123456,A,3505.0000,N,12902.0000,E,1.0,0.0,221199,0.0,E*00
$GPRMC,044610.00,A,3505.2139,N,12904.2867,E,00.2,229.1,180702,,*0D

$GPGLL,3504.2892,N,12900.2503,E,024950.00,V*14
$GPGLL,3505.09,N,12902.45,E*PCL
$GPZDA,025220.00,17,04,1999,00,00*6B
$GPZDA,050048,13,09,1998,+00
GPS DATA CABLE (RCA)
CENTER -> NMEA ( + ) OUTER -> NMEA ( - )
1-3. SPEAKER
SPEAKER MODEL SS-6000 8Ω7W IS USED.
SPEAKER JACK(3.5mm)
( + ) ( - )

BODY SPEAKER OUTPUT CONNECTOR
1
11
1-
--
-4.
4. 4.
4. MIKE
MIKEMIKE
MIKE

CONDENSOR MARK WAS USED.
IF CABLES OF MIKE HANGERS ARE LINKED TO THE BODY GND TERMINAL, THIS IS
AUTOMATICALLY RETURNED TO 16 CHANNELS.
MIC CABLE FUNCTION
CN3
1 MIC ( + )
2 MIC ( - )
CN6
1 KEYM
2 MPTT
3 GND
4 GND
5 N/C+

CN6 PTT CN3 MIC
1
11
1-
--
-5.
5. 5.
5. PRINTER
PRINTERPRINTER
PRINTER
4800BPS ARE USED SERIALLY. PRINTER POWER IS SUPPLIED SEPARATELY.
PRINTER CABLE
STR-6000 15P PRINTER 9P
2. E-RXD DATA RX 2. DATA TX
3. E-TXD DATA TX 3. DATA RX
5. GND GND 5. GND
1
11
1-
--
-6.
6. 6.
6. ANTENNA
ANTENNAANTENNA
ANTENNA
50Ω SHOT TYPE 3dB ANTENNA (156.025MHz ~ 157.425MHz) IS USED. CONNECTOR
PL259 IS USED.
1
11
1-
--
-7.
7. 7.
7. LINKING CONNECTOR NAME
LINKING CONNECTOR NAME LINKING CONNECTOR NAME
LINKING CONNECTOR NAME

POWER GPS IN SPEAKER TX / RX ANT DSC ANT
2.
2. 2.
2. MMSI
MMSI MMSI
MMSI INPUT PROCESS
INPUT PROCESSINPUT PROCESS
INPUT PROCESS
IF YOU PRESS KEY LONG, MENU ITEM SELECT
MENU ITEM SELECTMENU ITEM SELECT
MENU ITEM SELECT SCREEN COMES OUT.
2
22
2-
--
-1.
1. 1.
1. ON MENU ITEM SELECT
MENU ITEM SELECTMENU ITEM SELECT
MENU ITEM SELECT, USING KEY,
H/L
ENT
8.DSC SET
8.DSC SET8.DSC SET
8.DSC SET .
2
22
2-
--
-2.
2. 2.
2. ON DSC SETUP
DSC SETUPDSC SETUP
DSC SETUP,
, ,
,
H/L
ENT
USER MMSI
USER MMSIUSER MMSI
USER MMSI .
2
22
2-
--
-3.
3.3.
3. ON INPUT USER MMSI
INPUT USER MMSIINPUT USER MMSI
INPUT USER MMSI, SELECT USING
0 TEST
* - /
~
9 CAN
WXY
KEYS.
2
22
2-
--
-4.
4.4.
4. ON REPEAT USER MMSI
REPEAT USER MMSIREPEAT USER MMSI
REPEAT USER MMSI,
, ,
, INPUT SAME ID
IDID
ID ONCE AGAIN, BY THE SAME PROCESS
AS 1-3.

2
22
2-
--
-5.
5.5.
5. ON RECEIVED USER MMSI
RECEIVED USER MMSIRECEIVED USER MMSI
RECEIVED USER MMSI , IF YOU
H/L
ENT
STROE?,
STROE?, STROE?,
STROE?, MMSI ID
MMSI IDMMSI ID
MMSI ID IS INPUT.
3.
3. 3.
3. MMSI
MMSI MMSI
MMSI REVISING INPUT PROCESS
REVISING INPUT PROCESSREVISING INPUT PROCESS
REVISING INPUT PROCESS
PRESS KEY LONG, THEN MENU ITEM SELECT
MENU ITEM SELECTMENU ITEM SELECT
MENU ITEM SELECT COMES OUT.
3
33
3-
--
-1.
1. 1.
1. ON MENU ITEM SELECT
MENU ITEM SELECTMENU ITEM SELECT
MENU ITEM SELECT,
, ,
, USING KEY,
H/L
ENT
8.DSC SET
8.DSC SET8.DSC SET
8.DSC SET .
3
33
3-
--
-2.
2. 2.
2. ON DSC SETUP
DSC SETUPDSC SETUP
DSC SETUP,
, ,
,
H/L
ENT
8.USER MMSI
8.USER MMSI8.USER MMSI
8.USER MMSI.
3
33
3-
--
-3.
3. 3.
3. ON USER MMSI
USER MMSIUSER MMSI
USER MMSI,
, ,
, PRESS .
3
33
3-
--
-4.
4. 4.
4. ON INPUT USER MMSI
INPUT USER MMSI INPUT USER MMSI
INPUT USER MMSI ,
, ,
, SELECT, USING
0 TEST
* - /
~
9 CAN
WXY
KEYS.
3
33
3-
--
-5.
5. 5.
5. ON REPEAT USER MMSI
REPEAT USER MMSIREPEAT USER MMSI
REPEAT USER MMSI,
, ,
, INPUT SAME ID
IDID
ID ONCE AGAIN, BY THE SAME PROCESS
AS 3-4.
3
33
3-
--
-6.
6. 6.
6. ON RECEIVED USER MMSI
RECEIVED USER MMSIRECEIVED USER MMSI
RECEIVED USER MMSI,
, ,
, IF YOU
H/L
ENT
STROE?
STROE?STROE?
STROE?,
,,
, MMSI ID
MMSI IDMMSI ID
MMSI ID IS INPUT.
4. GPS AL
4. GPS AL4. GPS AL
4. GPS ALERT
ERTERT
ERT ON/OFF
ON/OFF ON/OFF
ON/OFF
PRESS KEY LONG. THEN MENU ITEM SELECT
MENU ITEM SELECTMENU ITEM SELECT
MENU ITEM SELECT SCREEN COMES OUT.
4
44
4-
--
-1.
1. 1.
1. ON MENU ITEM SELECT
MENU ITEM SELECTMENU ITEM SELECT
MENU ITEM SELECT,
,,
, USING KEY,
H/L
ENT
8.GPS FUNCTION SET
8.GPS FUNCTION SET8.GPS FUNCTION SET
8.GPS FUNCTION SET.
4
44
4-
--
-2.
2. 2.
2. ON GPS FUNCTION SET
GPS FUNCTION SETGPS FUNCTION SET
GPS FUNCTION SET , USING KEY,
H/L
ENT
GPS ALERT ON/OFF
GPS ALERT ON/OFFGPS ALERT ON/OFF
GPS ALERT ON/OFF.
..
.

4
44
4-
--
-2.
2. 2.
2. ON GPS ALERT ON/OFF
GPS ALERT ON/OFFGPS ALERT ON/OFF
GPS ALERT ON/OFF,
,,
, USING KEY,
H/L
ENT
ON
ONON
ON.
..
.
5. ALL CLEAR METHOD
5. ALL CLEAR METHOD5. ALL CLEAR METHOD
5. ALL CLEAR METHOD
5
55
5-
--
-1
11
1. IN POWER ON
ONON
ON,
, ,
, PRESS + KEYS AT THE SAME TIME.
5
55
5-
--
-2
22
2. ON HIDDEN MENU SELECT
HIDDEN MENU SELECTHIDDEN MENU SELECT
HIDDEN MENU SELECT,
, ,
,
H/L
ENT
CLEAR ALL
CLEAR ALLCLEAR ALL
CLEAR ALL.
5
55
5-
--
-3.
3.3.
3. ON CLEAR ALL
CLEAR ALLCLEAR ALL
CLEAR ALL,
,,
,
H/L
ENT
YES?
YES?YES?
YES?.
6.
6. 6.
6. ANTENNA SWR CHECK OFF METHOD
ANTENNA SWR CHECK OFF METHODANTENNA SWR CHECK OFF METHOD
ANTENNA SWR CHECK OFF METHOD
6
66
6-
--
-1
11
1. PRESS KEY LONG. THEN MENU ITEM SELECT
MENU ITEM SELECT MENU ITEM SELECT
MENU ITEM SELECT SCREEN COMES OUT.
6
66
6-
--
-2.
2. 2.
2. ON 9.RADIO SE
9.RADIO SE9.RADIO SE
9.RADIO SET
TT
T,
, ,
, USING
H/L
ENT
KEYS,
H/L
ENT
ANTENNA CHECK
ANTENNA CHECKANTENNA CHECK
ANTENNA CHECK.
..
.
-- ANTENNA CHECK –
USE ANTENNA WARNING?
YES
YESYES
YES
> NO
> NO > NO
> NO (NO ANTENNA CHECK)
7. VDR
7. VDR 7. VDR
7. VDR SETTING
SETTINGSETTING
SETTING
7
77
7-
--
-1.
1. 1.
1. IN POWER ON
ONON
ON,
, ,
, PRESS + KEYS AT THE SAME TIME.
7
77
7-
--
-2
22
2. ON HIDDEN MENU SELECT
HIDDEN MENU SELECTHIDDEN MENU SELECT
HIDDEN MENU SELECT,
, ,
, USING KEY,
H/L
ENT
MODE CHANGE
MODE CHANGEMODE CHANGE
MODE CHANGE.

7
77
7-
--
-3.
3. 3.
3. IF UNUSE REMOTE
UNUSE REMOTEUNUSE REMOTE
UNUSE REMOTE IS IN MENU, VDR SETTING IS DONE.
FINISH BY . (SET UP FROM 7-5.)
7
77
7-
--
-4.
4. 4.
4. CHANGE USE REMOTE
USE REMOTE USE REMOTE
USE REMOTE IN MENU TO UNUSE REMOTE
UNUSE REMOTEUNUSE REMOTE
UNUSE REMOTE.
AFTER CHECKING USE REMOTE 4800/2400BPS
USE REMOTE 4800/2400BPSUSE REMOTE 4800/2400BPS
USE REMOTE 4800/2400BPS
H/L
ENT
H/L
ENT
-> UNUSE
UNUSE UNUSE
UNUSE
REMOTE
REMOTEREMOTE
REMOTE,
, ,
, PRESS
H/L
ENT
7
77
7-
--
-5.
5. 5.
5. PRESS KEY LONG. USING KEY,
H/L
ENT
9.RADIO SET
9.RADIO SET9.RADIO SET
9.RADIO SET .
7
77
7-
--
-6.
6. 6.
6. VDR ON/OFF
VDR ON/OFF VDR ON/OFF
VDR ON/OFF -
--
->
> >
>
H/L
ENT
.
SET VDR MODE?
> VDR MODE ON
> VDR MODE ON> VDR MODE ON
> VDR MODE ON SETTING
H/L
ENT
ESCAPE BY .
VDR MODE OFF
VDR CABLE 15P
14. VDR ( + ) VDR ( + )
15. VDR ( - ) VDR ( - )

8.
8. 8.
8. REMOTE SETTING
REMOTE SETTINGREMOTE SETTING
REMOTE SETTING
8
88
8-
--
-1.
1. 1.
1. IN POWER ON
ONON
ON,
, ,
, PRESS + KEYS AT THE SAME TIME.
8-2. ON 'HIDDEN MENU SELECT' SCREEN, DO 'MODE CHANGE'.
8-3. WHEN SET UP USE REMOTE (4800BPS) IN MENU, ESCAPE.
8-4. IF 'UNUSE REMOTE' IS IN MENU, VDR SETTING IS DONE. CHANGE SETTING TO
'USE REMOTE (4800BPS)'.
CHECK UNUSE REMOTE USE REMOTE 4800BPS SETTING.
AFTER LOCATING CURSOR AT NORAMAL MODE, ESCAPE.
8
88
8-
--
-2
22
2.ON HIDDEN MENU SELECT
HIDDEN MENU SELECTHIDDEN MENU SELECT
HIDDEN MENU SELECT,
, ,
, USING ,
H/L
ENT
MODE CHANGE
MODE CHANGEMODE CHANGE
MODE CHANGE.
8
88
8-
--
-3.
3. 3.
3. IF USE REMOTE (4800BPS)
USE REMOTE (4800BPS)USE REMOTE (4800BPS)
USE REMOTE (4800BPS) IS SET IN MENU, ESCAPE BY .
8
88
8-
--
-4.
4.4.
4.IF UNUSE REMOTE
UNUSE REMOTEUNUSE REMOTE
UNUSE REMOTE IS IN MENU, VDR SETTING IS DONE. CHANGE SETTING TO USE
USE USE
USE
REMOTE (4800BPS)
REMOTE (4800BPS)REMOTE (4800BPS)
REMOTE (4800BPS).
CHECK UNUSE REMOTE
UNUSE REMOTEUNUSE REMOTE
UNUSE REMOTE
H/L
ENT
H/L
ENT
USE REMOTE 4800BPS
USE REMOTE 4800BPS USE REMOTE 4800BPS
USE REMOTE 4800BPS SETTING.
AFTER LOCATING CUSSOR AT NORAMAL MODE
NORAMAL MODENORAMAL MODE
NORAMAL MODE,
, ,
, ESCAPE BY
.
9. P
9. P9. P
9. PRIVATE CHANNEL SETTING
RIVATE CHANNEL SETTINGRIVATE CHANNEL SETTING
RIVATE CHANNEL SETTING

9
99
9-
--
-1.
1. 1.
1. IN POWER ON
ONON
ON,
,,
, PRESS +
H/L
ENT
KEYS AT THE SAME TIME.
NUMBER OF DIGITS ON LCD SCREEN IS CHANGED TO 3, FROM CHANNEL 16 -> 016.
9
99
9-
--
-2.
2. 2.
2. CANCELLATION.
CANCELLATION.CANCELLATION.
CANCELLATION. PRESS +
H/L
ENT
KEYS AT THE SAME TIME.
10.
10. 10.
10. INTERIOR PHOTOS
INTERIOR PHOTOSINTERIOR PHOTOS
INTERIOR PHOTOS
10
1010
10-
--
-1. V
1. V1. V
1. V-
--
-894 WATCH KEEPER RECEIVER
894 WATCH KEEPER RECEIVER 894 WATCH KEEPER RECEIVER
894 WATCH KEEPER RECEIVER

10
1010
10-
--
-2
22
2. V
VV
V-
--
-896 TRANSCEIVER
896 TRANSCEIVER896 TRANSCEIVER
896 TRANSCEIVER

10
1010
10-
--
-2
22
2. V
VV
V-
--
-895 CUP
895 CUP895 CUP
895 CUP

11.
11. 11.
11. CIRCUIT EXPLANATION
CIRCUIT EXPLANATIONCIRCUIT EXPLANATION
CIRCUIT EXPLANATION
RX
RXRX
RX
ANTENNA CHANGEOVER CIRCUIT
ANTENNA CHANGEOVER CIRCUIT ANTENNA CHANGEOVER CIRCUIT
ANTENNA CHANGEOVER CIRCUIT
ANTENNA CHANGEOVER CIRCUIT'S FUNCTION IS A LOW-PASS FILTER IN RECEIVING,
TUNING CIRCUIT IN TRANSMITTING. CIRCUIT PROTECTS TRANSMITTING SIGNALS
FROM BEING INPUT TO RECEIVING CIRCUIT. RECEIVING SIGNAL IS INPUT TO MAIN
UNIT THROUGH ANTENNA CONNECTOR & LOW-PASS FILTER (L12, L13, C102-C104,
C97). INPUT SIGNAL IS APPLIED TO RF CIRCUIT VIA THE NEXT ANTENNA
CHANGEOVER CIRCUIT. (D7, L9, C72. C105)
RF
RF RF
RF CIRCUIT
CIRCUITCIRCUIT
CIRCUIT
RF CIRCUIT AMPLIFIES SIGNALS WITHIN DESIRED FREQUENCY RANGE, REMOVE
SIGNALS OUF OF BAND. RECEIVING SIGNAL VIA ANTENNA CHANGEOVER CIRCUIT IS
APPLIED TO RF AMPLIFIED CIRCUIT (Q4) THROUGH 2 STEP COMMUTATOR TYPE BAND
PASS FILTER (D2-D3-L3-L4-C40-C42-C41-C44). THE SIGNAL, AMPLIFIED BY Q4, IS
APPLIED TO 2 STEP COMMUTATOR TYPE BAND PASS FILTER (D4-D5-L5-L6-C45-C47-
C46-C52) IN ORDER TO REMOVE UNNECESSARY SIGNAL & IMPROVE THE SELECTION.
THEN, THE SIGNAL IS APPLIED TO THE 1ST MIXER CIRCUIT. D2-D5 ARE CONTROLLED
BY TRANSISTOR, ACCORDING TO THE CALCULATION FROM CPU, IN ORDER TO
ORGANIZE THE ROUTE OF BAND PASS FILTER.
THE 1ST MIXER CIRCUIT & THE 1ST MIDDLE FREQUENCY CIRCUIT
THE 1ST MIXER CIRCUIT & THE 1ST MIDDLE FREQUENCY CIRCUITTHE 1ST MIXER CIRCUIT & THE 1ST MIDDLE FREQUENCY CIRCUIT
THE 1ST MIXER CIRCUIT & THE 1ST MIDDLE FREQUENCY CIRCUIT
THE 1ST MIXER CIRCUIT CHANGES RECEIVED SIGNAL TO THE FIXED FREQUENCY OF
THE 1-1F SIGNAL, TOGETHER WITH THE 1ST LO (VCO OUTPUT) FREQUENCY. DESIRED
FREQUENCY, DERIVED FROM CHANGING THE 1ST LO FREQUENCY, WILL BE
DELIVERED TO THE CRYSTAL FILTER, ORGANIZED AS A PAIR AT THE NEXT STEP OF
THE MIXER.
SIGNAL, DELIVERED FROM RF CIRCUIT, IS MIXED WITH VOC SIGNAL AT THE 1ST
MIXED CIRCUIT(Q5) IN ORDER TO CREATE THE 1-1F SIGNAL OF 21.7MHz.1-IF SIGNAL IS
APPLIED TO THE CRYSTAL FILTER(FL1, FL 2), ORGANIZED AS A PAIR, WHICH REMOVE
SIGNALS OUT OF BAND. THEN, IT IS AMPLIFIED AT IF AMP (Q6). AMPLIFIED SIGNAL IS
APPLIED TO THE 2ND MIXED CIRCUIT (U2).

THE 2ND MIDDLE FREQUENCY & DEMODULATOR CIRCUIT
THE 2ND MIDDLE FREQUENCY & DEMODULATOR CIRCUITTHE 2ND MIDDLE FREQUENCY & DEMODULATOR CIRCUIT
THE 2ND MIDDLE FREQUENCY & DEMODULATOR CIRCUIT
THE 2ND MIXED CIRCUIT TRANSLATES THE 1-IF SIGNAL TO THE 2-IF SIGNAL. DOUBLE
SUPER HETERODYNE METHOD (TRANSLATE RECEIVING SIGNAL TWICE) IMPROVES
IMAGE REJECTION RATIO & GAINS STABLE RECEIVING PROFITS.
FM IF IC (U2) INCLUDES THE 2ND PART OSCILLATOR, THE 2ND MIXER, LIMITER
AMPLIFIER, QUADRATURE DEMODULATOR AND NOISE DETECTOR CIRCUIT, ETC.
THE 1-1F SIGNAL FROM Q6 IS APPLIED TO THE 2ND MIXER OF U2 (PIN 16). AND THE
2ND LO SIGNAL OF 21.25MHz (FOR CREATING THE 2ND IF SIGNAL OF 450 KHz IS
CREATED AND MIXED FROM STANDARD OSCILLATOR
(X2, Q25). THE 2-1F SIGNAL FROM U2 (PIN 3) IS DELIVERED BY CERAMIC FILTER (FL3),
WHICH REMOVES UNNECESSARY SIGNALS. THEN, IT IS APPLIED TO THE 2-1F
(LIMITER) AMPLIFIER AT U2 (PIN 5). THIS SIGNAL IS APPLIED TO FM DEMODULATOR OF
US IN ORDER TO DEMODULATE TO AF SIGNAL. FM DEMODULATOR CIRCUIT USES
QUADRATURE DEMODULATION METHOD (BEELINE PHASE DETECT). IT USES CERAMIC
DISCRIMINATOR(X1) NONE ADJUSTING CIRCUIT IN ORDER TO GAIN PHASE DELAY.
THE SIGNAL, DEMODULATED FROM U2 (PIN 9) IS APPLIED TO AF CIRCUIT.
AF
AF AF
AF AMPLIFYING CIRCUIT
AMPLIFYING CIRCUITAMPLIFYING CIRCUIT
AMPLIFYING CIRCUIT
AF AMPLIFYING CIRCUIT AMPLIFIES DEMODULATED SIGNAL TO OPERATE SPEAKER.
AF CIRCUIT INCLUDES AF MUTE CIRCUIT FOR SQUELCH. AF SIGNAL FROM U2 (PIN 9)
IS APPLIED TO DE-AMPHASIS CIRCUIT (R20, C50).
DE-AMPHASIS CIRCUIT IS A UNITED CIRCUIT, OF WHICH FREQUENCY IS 6dB/OCTAVE.
UNITED SIGNAL IS APPLIED TO ACTIVE FILTER (Q7, Q10). IT REMOVES UNNECESSARY
LOW BAND NOISE SIGNAL BY HIGH PASS
FILTER Q7 FUNCTION, REMOVES HIGH BAND NOISE SIGNAL BY LOW PASS FILTER Q10
FUNCTION. FILTERED SIGNAL IS APPLIED TO THE AF POWER AMPLIFIER (U6, PIN 1) OF
THE NEXT STEP VIA [VOLUME]. SIGNAL, OUTPUT FROM U6(PIN 4) OPERATES
INNER(OUTER) SPEAKER.
SQUELCH CIRCUIT
SQUELCH CIRCUITSQUELCH CIRCUIT
SQUELCH CIRCUIT
SQUELCH CIRCUIT CUTS AF SIGNAL, WHEN NO RF SIGNAL IS RECEIVED. SQUELCH
CIRCUIT CHANGES AF MUTE SWITCH, BY DETECTING NOISE COMPONENT FROM AF
SIGNAL. A PART OF AF SIGNAL FROM FM IF IC (U2, PIN 9) IS APPLIED TO ACTIVE
FILTER (U2, PIN 8), AFTER PASSING SQUELCH ADJUSTER (VR1). ACTIVE FILTER

AMPLIFIES & FILTERS NOISE COMPONENT. FILTERED SIGNAL IS APPLIED TO NOISE
DETECTER & "NREC" SIGNAL IS OUTPUT FROM PIN 14. "NREC" SIGNAL IS AMPLIFIED
BY DC AMPLIFIER (U10/B) OF CPU BOARD & APPLIED AS "SQL0" BY CPU (U8, PIN 80).
CPU ANALYZE NOISE STATUS AND OUTPUT "RMUTM", "RMUTS" SIGNALS TO CHANGE
AF MUTE SWITCH(U12/A, U12/B).
TRANSMITTER
TRANSMITTERTRANSMITTER
TRANSMITTER
MICROPHONE AMPLYFYING CIRCUIT
MICROPHONE AMPLYFYING CIRCUITMICROPHONE AMPLYFYING CIRCUIT
MICROPHONE AMPLYFYING CIRCUIT
MICROPHONE AMPLYFYING CIRCUIT AMPLIFIES VOICE SIGNAL TOGETHER WITH
+6dB/OCTAVE PRE-EMPHASIS FROM MICROPHONE TO THE LEVEL, MODULATING
CIRCUIT NEEDS.AF SIGNAL FROM MICROPHONE IS AMPLIFIED BY MICROPHONE
AMPLIFIER(U7/A) VIA ANALOGUE SWITCH(U10/B). CONDENSER (C162) & RESISTER
(R101) ARE LINKED TO GAIN PRE-EMPHASIS AGAINST AMPLIFIER. AMPLIFIED SIGNAL
PASSES BY IDC AMPLIFIER (U15/A) & ANALOGUE SWITCH (U9/B). AND IT IS DELIVERED
THROUGH CROSSTALK FILTER (U15/B) TO REMOVE UNNECESSARY SIGNALS OVER 3
kHz. THEN, FILTERED SIGNAL IS APPLIED TO MODULATING CIRCUIT.
MODULATING CIRCUIT
MODULATING CIRCUITMODULATING CIRCUIT
MODULATING CIRCUIT
MODULATING CIRCUIT MODULATES VCO OSCILLATING SIGNAL (RF SIGNAL), USING
MICROPHONE VOICE SIGNAL. VOICE SIGNAL FROM CROSSTALK FILTER (IC13b) IS
APPLIED TO MODULATE SIGNAL, OSCILLATED AT TXVCO (Q7), AFTER
PASSING FREQUENCY ADJUSTING PORT (R172) & CHANGING REACTANCE OF D8 AT
MODULATING CIRCUIT (D8).
DRIVE AMPLIFYING CIRCUIT
DRIVE AMPLIFYING CIRCUITDRIVE AMPLIFYING CIRCUIT
DRIVE AMPLIFYING CIRCUIT
DRIVE AMPLIFYING CIRCUIT AMPLIFIES VCO OSCILLATING SIGNAL TO THE LEVEL,
POWER AMPLIFIER NEEDS. VCO OUTPUT IS APPLIED TO Tx/Rx SWITCH (D8). Tx SIGNAL
FROM Tx/Rx SWITCH AMPLIFIES PRE-DRIVE (Q19) & DRIVE (Q18) AMPLIFIER, IN ORDER
TO GAIN SIGNAL LEVEL ABOUT 200mW. THEN AMPLIFIED SIGNAL IS APPLIED TO RF
POWER AMPLIFIER (U8).
POWER AMPLIFIER CIRCUIT
POWER AMPLIFIER CIRCUITPOWER AMPLIFIER CIRCUIT
POWER AMPLIFIER CIRCUIT
POWER AMPLIFIER CIRCUIT AMPLIFIES DRIVER SIGNAL TO THE OUTPUT POWER
LEVEL. U8 IS POWER MODULE, WHICH HAS ABOUT 35W AMPLIFYING OUTPUT
FUNCTION AGAINST 300mW INPUT. OUTPUT FROM U8 (PIN 4) IS DELIVERED BY
ANTENNA CHANGING CIRCUIT (D9). THEN, IT IS APPLIED TO ANTENNA CONNECTOR
VIA LOW PASS FILTER.

APC
APCAPC
APC (AUTOMATIC POWER CONTROL) CIRCUIT
(AUTOMATIC POWER CONTROL) CIRCUIT(AUTOMATIC POWER CONTROL) CIRCUIT
(AUTOMATIC POWER CONTROL) CIRCUIT
APC CIRCUIT STABILIZES Tx OUTPUT POWER. RF OUTPUT SIGNAL FROM POWER
AMPLIFIER (U8) IS DETECTED TO OUTPUT DETECTING CIRCUIT (D13, D14). THEN, IT IS
APPLIED TO ONE OF DIFFEENTIAL MOTION AMPLIFIER (Q22) INPUTS VIA High/Low
CONTROL CIRCUIT (VR2, Q23). APPLIED POWER CONTROLS DIFFEENTIAL MOTION
AMPLIFIER (Q22) OUTPUT & BIAS VOLTAGE CONTROL (Q17). LIKE THIS, APC CIRCUITS
KEEPS CERTAIN OUTPUT POWER.
PLL
PLLPLL
PLL (PHASE LOCKED LOOP) CIRCUIT
(PHASE LOCKED LOOP) CIRCUIT(PHASE LOCKED LOOP) CIRCUIT
(PHASE LOCKED LOOP) CIRCUIT
OUTLINE
OUTLINEOUTLINE
OUTLINE
PLL CIRCUIT PROVIDES STABLE OSCILLATING OF Tx FREQUENCY & Rx THE 1-LO
FREQUENCY. PLL CIRCUIT COMPARES PHASES OF VCO FREQUENCIES, DIVIDED TO
STANDARD FREQUENCIES. PLL OUTPUT FREQUENCIES ARE CONTROLLED BY
DIVIDING RATE OF MODIFYING OSCILLATOR & PROGRAM POSSIBLE DIVIDER. U5 IS
PLL IC, WHICH INCLUDES VCO CIRCUIT CONTROL & FREE SCALER FOR Tx, Rx,
PROGRAM POSSIBLE COUNTER, PROGRAM POSSIBLE DIVIDER, PHASE DETECTER,
CHARGE PUMP, ETC. PLL CIRCUIT DIRECTLY CREATES TX FREQUENCIES & Rx 1-1F
FREQUENCIES ON ONE CHIP PLL IC (U5) TOGETHER WITH VCO. IT SETS DIVIDING
RATE, ACCORDING TO SERIES DATA FROM PLL CPU, AND COMPARES PHASES OF
VCO SIGNALS, TOGETHER WITH STANDARD OSCILLATING FREQUENCIES. RESULTS,
PHANSE DETECTED FROM PLL IC, ARE SUPPLIED FROM PIN2 AGAINST EACH Tx & Rx.
STANDARD FREQUENCY (21.25 MHz) IS OSCILLATED AT X2.
PLL
PLL PLL
PLL LOOP
LOOPLOOP
LOOP
SIGNALS, CREATED FROM VCO (Q15, D11, D17) ARE INPUT TO PLL IC (U5, PIN 6). THEN,
IT IS APPLIED TO PHASE DETECTER, AFTER BEING DIVIDED FROM PROGRAM
POSSIBLE DIVIDER. PHASE DETECTER COMPARES INPUT SIGNALS WITH STANDARD
FREQUENCY, THEN, IT OUTPUTS SIGNALS (PULSE-FORM-SIGNAL) OF PHANSE
DISCREPANCIES AT PIN 2. SIGNAL OF PULSE-FORM IS CHANGED TO DIRECT VOLTAGE
(LOCK VOLTAGE) AT LOOP FILTER (C132, C143, C140, R73, R72). THEN IT IS APPLIED IN
ORDER TO STABILIZE OSCILLATING FREQUENCIES OF VARACTOR DIODES (D11, D17)
OF VCO.

VCO
VCOVCO
VCO (VOLTAGE CONTROL OSCILLATER)
(VOLTAGE CONTROL OSCILLATER)(VOLTAGE CONTROL OSCILLATER)
(VOLTAGE CONTROL OSCILLATER) CIRCUIT
CIRCUITCIRCUIT
CIRCUIT
OUTPUT FROM VCO (Q16) IS AMPLIFIED AT BUFFER AMPLIFIER (Q15). THEN IT IS SENT
TO Tx/Rx SWITCHED (D8, D6). Rx LO SIGNAL IS APPLIED TO THE 1ST MIXER CIRCUIT
(Q5) THROUGH LOW PASS FILTER, AND Tx SIGNAL IS APPLIED TO PRE-DRIVE
AMPLIFIER (Q19). A PART OF VCO OUTPUT IS USED AGAIN AT PLL IC (U5, PIN 6) VIA
C146.
DSC
DSCDSC
DSC (DIGITAL SELECTIVE CALLING) MODULATING CIRCUIT
(DIGITAL SELECTIVE CALLING) MODULATING CIRCUIT(DIGITAL SELECTIVE CALLING) MODULATING CIRCUIT
(DIGITAL SELECTIVE CALLING) MODULATING CIRCUIT
MODULATING SIGNAL FROM CPU IS DELIVERED THROUGH LOW PASS FILTER (U14/B)
WITH + 6 dB/OCTAVE FEATURE. SIGNAL FROM LOW BAND FILTER (U14/B) IS
DELIVERED THROUGH CROSSTALK FILTER (U15/B), IN ORDER TO REMOVE
UNNECESSARY SIGNALS OVER 3 kHz. FILTERED DSC SIGNAL IS APPLIED TO TX
MODULATING CIRCUIT VIA MODULATION FACTOR ADJUSTER (VR3).
12.
12. 12.
12. TROUBLE SHOOTING METHOD
TROUBLE SHOOTING METHODTROUBLE SHOOTING METHOD
TROUBLE SHOOTING METHOD
WHEN POWER IS NOT TURNED ON
> FUSE IS BROKEN, OR VOLTAGE IS NOT SUPPLIED TO RADIO.
- CHECK BREAKING, CRUSH, SHORT CIRCUIT, POWER GROUNDING, ETC OF
POWER CABLE.
- AFTER CHECKING WIRE LOSS, CHANGE 10A FUSE (THERE ARE 2 SPARE
FUSES).
- CHECK BATTERY VOLTAGE. VOLTAGE SHOULD BE DC 13.6V (±10%).
> POWER IS NOT TURNED ON.
- CHANGE FCC DUE TO CONNECTING ERROE
WHEN FUSE IS CUT, WHEN SWITCH IS TURNED ON
> WIRE OF POWER MAY BE CONNECTED CONVERSELY.
- CHECK IF RED LINE IS CONNECTING BATTERY'S (+) TERMINAL, AND
BLACK LINE IS CONNECTING BATTERY'S (-) TERMINAL.
SOUND DEFECTS.
> WHEN NO SOUND IS HEARED FROM OUTER SPEAKER
- CHECK IF CABLES OF OUTER SPEAKER ARE CONNECTED CORRECTLY.