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FM TRANSCEIVER
UBZ-LJ8
SERVICE MANUAL
Antenna
(T90-1016-05)
Front glass
(B10-2742-03) : B
(B10-2748-03) : SL,Y
Button knob (PTT)
(K29-9257-03)
Key top (4 keys)
(K29-9256-02)
Cabinet assy (Front)
(A02-3794-03) : B
(A02-3795-03) : Y
(A02-3796-03) : SL
B : Black
Y : Yellow
SL : Silver
Cap (SP/MIC)
(B09-0673-03)
Knob (VOL)
(K29-9258-03)
CIRCUIT DESCRIPTION ............................ 2
COMPONENTS DESCRIPTION ................ 7
TERMINAL FUNCTION ............................. 7
SEMICONDUCTOR DATA ........................ 8
PARTS LIST ............................................... 9
EXPLODED VIEW .................................... 13
PACKING ................................................. 14
ADJUSTMENT ........................................ 15
SCHEMATIC DIAGRAM .......................... 26
BLOCK DIAGRAM ................................... 30
LEVEL DIAGRAM .................................... 32
UBC-4 (BATTERY CHARGER) ................ 33
UPB-1 (BATTERY PACK) ........................ 33
SPECIFICATIONS ................. BACK COVER
© 2002-12 PRINTED IN JAPAN
B51-8644-00 ( N ) 506
CONTENTS
TX-RX UNIT (X57-6672-70) (A/2) ....... 20
TX-RX UNIT (X57-6672-70) (B/2) ....... 24
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Summary of Contents for Kenwood UBZ-LJ8
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Page 1: Table Of Contents
FM TRANSCEIVER UBZ-LJ8 SERVICE MANUAL © 2002-12 PRINTED IN JAPAN B51-8644-00 ( N ) 506 Cap (SP/MIC) (B09-0673-03) CONTENTS Knob (VOL) (K29-9258-03) CIRCUIT DESCRIPTION ......2 Antenna (T90-1016-05) COMPONENTS DESCRIPTION ....7 TERMINAL FUNCTION ......7 Front glass SEMICONDUCTOR DATA ......8... -
Page 2: Circuit Description
UBZ-LJ8 CIRCUIT DESCRIPTION Frequency Configuration Simplex 446.00625~446.09375MHz 21.7MHz 446MHz 1st MIX MIX, IF 1st local Simplex FM IC 21.25MHz 424.30625~ 424.39375MHz Simplex 446.00625~ Fig. 3 Receiver front end and Mixer circuit 446.09375MHz 21.25MHz TCXO Fig. 1 Frequency configuration Item Rating... - Page 3 UBZ-LJ8 CIRCUIT DESCRIPTION ■ IF Amplifier ■ Squelch Circuit The IF circuit consists of FM IC (IC2). This IC contains A squelch circuit is provided to prevent interference from local line input buffer, Mixer, FM DET and audio frequency noise or weak signal being output to the speaker during non- amplifier.
- Page 4 UBZ-LJ8 CIRCUIT DESCRIPTION Q201 Transmitter System D203 VOX AMP ■ Microphone Amplifier Circuit The audio signal acquired from the microphone (MIC200) IC208 passes through the MIC amplifier (IC204) to perform signal IC204 amplification. An AGC (Automatic gain control) circuit is in- MIC AMP cluded to maintain output audio signal level.
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Page 5: Circuit Description
UBZ-LJ8 CIRCUIT DESCRIPTION output TX/RX Fig. 10 VCO circuit ■ PLL Circuit Control System Frequency data is sent to the PLL IC (IC1) from MPU ■ Reset Circuit (IC208) through common data line either when the set is When a battery is inserted, the MPU power supply pro- powered on, or when channel is changed, or when transmit vides the operating voltage after about 0.5sec. - Page 6 UBZ-LJ8 CIRCUIT DESCRIPTION ■ Power Supply Circuit If there is no incoming signal or key press after 5 second, unit will enter its power save mode. In power save mode, 3C The battery voltage directly supplies RF final amplifier (Q8) and 3R will be turned on and off respectively for power sav- and AF amplifier (IC203) through AVR (Q216).
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Page 7: Components Description
UBZ-LJ8 COMPONENTS DESCRIPTION / TERMINAL FUNCTION TX-RX Unit (X57-6672-70) (A/2) : Control Ref. No. Use/Function Operation/Condition/Compatibility Ref. No. Use/Function Operation/Condition/Compatibility 1st Mixer RX Frequency – Q200 MIC Mute Switch On when microphone mute 1st local oscillation frequency Q201 VOX Amplifier IF Amplifier 1st IF 21.7MHz... -
Page 8: Semiconductor Data
UBZ-LJ8 SEMICONDUCTOR DATA MPU : M38C24M6502HP (IC208) Pin No. Pin Name I/O Function ■ Pin Function DOWN [Down] key input Pin No. Pin Name I/O Function QTOUT CTCSS output BUSY Busy input BEEP Beep output RSSI RSSI input MICM MIC mute... -
Page 9: Parts List
Les articles non mentionnes dans le Parts No. ne sont pas fournis. Y : AAFES (Europe) X : Australia M : Other Areas Teile ohne Parts No. werden nicht geliefert. UBZ-LJ8 (Y50-5762-XX) TX-RX UNIT (X57-6672-70) Desti- Desti- Ref. No. Address Parts No. - Page 10 UBZ-LJ8 PARTS LIST TX-RX UNIT (X57-6672-70) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C98,99 CK73GB1H471K CHIP C 470PF C251 CK73GB1C104K CHIP C 0.10UF C101 CC73GCH1H030B CHIP C 3.0PF C252...
- Page 11 UBZ-LJ8 PARTS LIST TX-RX UNIT (X57-6672-70) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation ✽ L79-1825-05 FILTER (447MHZ) RK73GB1J104J CHIP R 100K 1/16W L34-4572-05 AIR-CORE COIL R64,65 RK73GB1J105J CHIP R 1.0M...
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Page 12: Parts List
UBZ-LJ8 PARTS LIST TX-RX UNIT (X57-6672-70) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R270 R92-1252-05 CHIP R 0 OHM J 1/16W IC204 TC75S51F MOS IC ✽ R271 RK73GB1J223J CHIP R... -
Page 13: Exploded View
UBZ-LJ8 EXPLODED VIEW MIC200 VR201 TX-RX unit (A/2) Insulating sheet TX-RX unit (B/2) Frame VR201 assy Model name plate Standard label A M2 x 4.5 : N09-2291-05 M2 x 14 : N80-2014-45 : N14-0801-05 D ø4 (TW) : N17-1040-46 M2 x 5 : N67-2005-46 S/No. -
Page 14: Packing
UBZ-LJ8 PACKING UBZ-LJ8 20 Belf hook (J29-0700-03) 705 Packing fixture 7 Instruction manual (B62-1669-10) 706 Warranty card 707 Item carton case Parts with the exploded numbers larger than 700 are not supplied. -
Page 15: Adjustment
UBZ-LJ8 ADJUSTMENT Required Test Equipment Setting 1. DC V.M and Tester (DVM) 1. Power voltage : DC 4.5V Current protection : Approx. 300mA 1) High input impedance 2. Frequency 2. RF VTVM (RF V.M) 1) Input impedance : 1MΩ min., 2pF max. - Page 16 UBZ-LJ8 ADJUSTMENT ■ Connection Jigs Jigs Connect the extension cable as shown in the illustration Use jigs for repair or adjustment. below. ■ Extension Cable (E30-3480-08) CN200 Extension cable TX-RX unit (E30-3480-08) (B/2) TX-RX unit (A/2) ■ ANT Cable (E30-3418-05) Solder the ANT cable to the ANT terminal and GND on the Modify the cable as shown below.
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Page 17: Adjustment Mode
UBZ-LJ8 ADJUSTMENT 6. Adjust the value according to the instructions on each Adjustment Mode item (Refer to “Adjustment instructions”). ■ Storing the Adjustment Value for the CTCSS 7. After adjusting the data value, press the [PTT] key to store Deviation, Battery Voltage Detection, Busy the new data to the EEPROM (IC210). - Page 18 UBZ-LJ8 ADJUSTMENT ■ Adjustment Mode Flow Chart CTCSS [MODE] for CTCSS deviation Press [UP]/[DOWN] keys to adjust the CTCSS deviation output deviation adjustment value. Press [PTT] to Press [MODE] key to cancel writing the value [DOWN] write in new value to the EEPROM (IC210).
- Page 19 UBZ-LJ8 ADJUSTMENT PLL Section Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 1. VCO lock voltage 1) 4CH : 446.04375MHz TX-RX LV Check 0.7~2.7V (B/2) 2) 4CH : 446.04375MHz PTT : ON ± 100Hz 2. Reference 1) 4CH : 446.04375MHz...
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Page 20: Pc Board
UBZ-LJ8 PC BOARD TX-RX UNIT (X57-6672-70) (A/2) Component side view (J72-0869-09 A/2) R299 C303 C201 C292 C206 R316 Q219 Q220 SP– C208 Q216 C211 (–) DOWN C209 MIC200 – Q211 MODE C234 C237 J72-0869-09 A/2 Q212 C240 R240 R235 D200... -
Page 21: Tx-Rx Unit (X57-6672-70) (B/2)
UBZ-LJ8 PC BOARD TX-RX UNIT (X57-6672-70) (A/2) Component side view (J72-0869-09 A/2) R319 Q213 R298 C303 D205 R238 Q219 C253 COM2 R261 COM1 COM0 R264 R263 C251 C247 C229 D203 WRITE Q201 C259 MIC200 C258 C295 C227 R230 R266 C226... - Page 22 UBZ-LJ8 PC BOARD TX-RX UNIT (X57-6672-70) (A/2) Foil side view (J72-0869-09 A/2) S200 PTT R288 C275 R287 C276 C277 R286 R285 X201 C273 C243 R284 R310 R302 R307 R311 C272 IC210 R251 R278 R279 C245 C246 R247 R308 R290 C225...
- Page 23 UBZ-LJ8 PC BOARD TX-RX UNIT (X57-6672-70) (A/2) Foil side view (J72-0869-09 A/2) – J72-0869-09 A/2 Component side Layer 1 Layer 2 Layer 3 Layer 4 CAT24WC01JI18 TA31136FN TK71530ASCL 2SK3656 Foil side...
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Page 24: Pc Board Tx-Rx Unit (X57-6672-70) (A/2)
UBZ-LJ8 UBZ-LJ8 PC BOARD PC BOARD TX-RX UNIT (X57-6672-70) (A/2) Component side view (J72-0869-09 A/2) TX-RX UNIT (X57-6672-70) (A/2) Component side view (J72-0869-09 A/2) R319 Q213 R299 C303 R298 C201 C292 C206 D205 R316 R238 Q219 Q220 C253 SP– C208... - Page 25 UBZ-LJ8 UBZ-LJ8 PC BOARD PC BOARD TX-RX UNIT (X57-6672-70) (A/2) Foil side view (J72-0869-09 A/2) TX-RX UNIT (X57-6672-70) (A/2) Foil side view (J72-0869-09 A/2) S200 PTT R288 C275 R287 C276 C277 R286 R285 X201 C273 C243 R284 R310 R302 R307...
- Page 26 UBZ-LJ8 PC BOARD TX-RX UNIT (X57-6672-70) (B/2) Component side view (J72-0869-09 B/2) Ref. No. Address C124 C134 C129 C128 C140 C153 J72-0869-09 B/2 Component side Layer 1 Layer 2 Layer 3 Layer 4 Foil side...
- Page 27 UBZ-LJ8 PC BOARD TX-RX UNIT (X57-6672-70) (B/2) Foil side view (J72-0869-09 B/2) Ref. No. Address C143 C122 C106 C138 C142 C135 C115 C117 C114 C144 C101 J72-0869-09 B/2 Component side Layer 1 Layer 2 Layer 3 Layer 4 Foil side...
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Page 28: Schematic Diagram
UBZ-LJ8 SCHEMATIC DIAGRAM TX-RX UNIT :CONTROL SECTION (X57-6672-70) (A/2) RX:0V RX:0V TX:2.468V TX:2.468V 3T SWITCH LAMP ON:4.49V LAMP ON:4.49V LAMP OFF:4.5V LAMP OFF:4.5V IC207 RX:2.944V RX:2.944V RX:2.83V RX:2.83V TK71530ASCL TX:0.082V TX:0.082V 2.95V 2.95V TX:2.83V TX:2.83V LAMP LAMP ON:2.229V ON:2.229V R238 LAMP OFF:4.5V... - Page 29 UBZ-LJ8 SCHEMATIC DIAGRAM TX-RX UNIT : CONTROL SECTION (X57-6672-70) (A/2) NOTES: NORMAL BTL_OUT SP_MUT SP.ON :4.5V SP.ON :3.647V SP.OFF :4.5V (WHEN BTL_IN =LOW, SWITCH TO EXT MODE) SP.OFF :0.014V INT.ON :4.5V INT.ON :3.647V INT.OFF:4.5V AMPLIFIER R298 INT.OFF:3.647V EXT. :4.49V AF AMPLIFIER EXT.
- Page 30 UBZ-LJ8 SCHEMATIC DIAGRAM TX-RX UNIT :RF SECTION (X57-6672-70) (B/2) SHIELD CASE(VCO) RX:1.798V RX:1.798V RX:1.889V RX:1.889V RX:0.835V RX:0.835V RX:1.794V RX:1.794V TX:1.815V TX:1.815V TX:1.889V TX:1.889V TX:0.861V TX:0.861V TX:1.798V TX:1.798V RX:0.774V RX:0.774V RX:0.765V RX:0.765V TX:0.787V TX:0.787V TX:0.765V TX:0.765V 3.5p (B) OSCILLATOR 2SC5108(Y) 2SC5066(O) 1SV270 RX:1.508V...
- Page 31 UBZ-LJ8 SCHEMATIC DIAGRAM • Note : The components marked with a dot ( ) are parts of layer 1. TX-RX UNIT : RF SECTION (X57-6672-70) (B/2) RX:0.145V RX:0.145V TX:4.47V TX:4.47V TX:1.636V TX:1.636V RF SWITCH TX:0.846V TX:0.846V TX:1.118V TX:1.118V TX:2.491V TX:2.491V...
- Page 32 TX-RX UNIT :CONTROL SECTION (X57-6672-70) (A/2) NOTES: NORMAL BTL_OUT SP_MUT SP.ON :4.5V .ON :4.5V SP.OFF :4.5V .OFF :4.5V SP.ON :3.647V .ON :3.647V (WHEN BTL_IN =LOW, SWITCH TO EXT MODE) SP.OFF :0.014V .OFF :0.014V INT.ON :4.5V .ON :4.5V INT.OFF:4.5V .OFF:4.5V AMPLIFIER INT.ON :3.647V .ON :3.647V R298...
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Page 33: Block Diagram
UBZ-LJ8 BLOCK DIAGRAM RF : X57-6672-70 (B/2) TX : 446.00625MHz~446.09375MHz RX : 424.30625MHz~424.39375MHz Shielding Case (VCO) SHIFT BUFF RF AMP RF AMP 5108 5066 5108 5108 F.CONT RX : 424.306 RIPPLE 4617 114EE FILTER AF AMP DET RB706 4738 BUSY... - Page 34 UBZ-LJ8 BLOCK DIAGRAM D8,D10 ANT SW RF AMP RF AMP TX/RX FREQUENCY 446.00625MHz~ HVC131 446.09375MHz 5092 3656 HSC277 P. CONT X : 424.30625MHz~424.39375MHz IF AMP RF AMP 446MHz 4082 21.7MHz MIXER IC209 BASEBAND IC AK2346 Q217,Q219 BTL SW CPH3413 IC203...
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Page 35: Level Diagram
UBZ-LJ8 LEVEL DIAGRAM Transmitter Section CONTROL J200 IC204 IC209 EXT. C265 MIC AMP & CTCSS INT. 5.17mV 167mV 167mV 87mV –8.0dBm –12.8dBm –1.8dBm –1.3dBm 11.8dBm 28.1dBm 28.3dBm 27.0dBm Microphone input : 1kHz, 5.0mVrms, 1.5kHz DEV AF : Measurements are taken by AF VTVM... -
Page 36: Ubc-4 (Battery Charger)
UBZ-LJ8 UBC-4 (BATTERY CHARGER) / UPB-1 (BATTERY PACK) UBC-4 External View UPB-1 External View UPB-1 Specifications UBC-4 Specifications Dimensions [W x H x D] mm (Projections included) ....44 (44) x 14.5 x 50.45 (51) Usable temperature range ........5°C~40°C Weight ................ -
Page 37: Specifications
Leuvensesteenweg 248 J, 1800 Vilvoorde, Belgium KENWOOD ELECTRONICS FRANCE S.A. 13, Boulevard Ney, 75018 Paris, France KENWOOD ELECTRONICS U.K. LIMITED KENWOOD House, Dwight Road, Watford, Herts., WD18 9EB United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands KENWOOD ELECTRONICS ITALIA S.p.A.