tti Tech PMR-446 Service Manual Download Page 1 | Manualshive

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tti Tech PMR-446 Service Manual Download Page 1

service

manual

PMR-446 Radio

TX-

446

TTI Tech

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Summary of Contents for PMR-446

Page 1: ...service manual PMR 446 Radio TX 446 TTI Tech...

Page 2: ...SECTION 4 1 GENERAL 4 2 SYNTHESIZER TRANSMITTER 4 3 TRANSMITTER ALIGNMENT 4 4 RECEIVER ALIGNMENT SECTION 5 1 ELECTRICAL PART LIST 5 2 MECHANICAL PART LIST 7 3 BATTERY PCB 4 ADJUSTMENT PROCEDURES SECTI...

Page 3: ...ulation FM Hum and Noise 36 dB Typical Audio distortion 5 Max Sensitivity 12dB SINAD 0 35 Max Squelch sensitivity 10 dB SINAD Typical 60 dB Min 70 dB Min Intermodulation ETS 65 dB Min 40 dB Typical Hu...

Page 4: ...RV503 CTCSS DCS Blance ADJ RV501 MOD ADJ RV101 CTCSS DCS Devation ADJ TP1 VCO Lock Voltage Detect CV301 Frequency ADJ TP3 TX 446 ADJUSTMENT POINT SECTION 2 INSIDE VIEWS 3...

Page 5: ...g the transmission reception conversion That is since the VCO should oscillate relatively low frequency during reception compared to transmission the Q307 is biased by the Q309 Therefore as a result t...

Page 6: ...ansmitter mode this voltage is compared to the one set by the 500mW The power output is then reduced or increased by varying the applied to the power amplifier Q407 Transmitter Audio Circuits The tran...

Page 7: ...ctor output feeds the audio high pass filter Q504A Q504B and Q504C The output of the audio high pass filter feeds the Volume Control SW201B VOL From the wiper arm on the Volume Control the audio is ro...

Page 8: ...ust CV301 for a Frequency Counter reading within 100Hz of the programmed transmits frequency 4 2 3 Modulation Adjustment 1 Connect the Radio in accordance with Figure 1 2 Place the Radio on channel 4...

Page 9: ...ct the Radio to the power supply with a cable that is rated to withstand a current of 2 amperes or greater 4 3 1 POWER Adjustment 1 Connect the Radio in accordance with Figure 2 2 Adjust by hardware p...

Page 10: ...en Please adjust Carrier Level of SG to become 10dB SINAD 4 Click Auto Tune button in a frame of Squelch Sensitivity Normal of a screen 5 Adjust Squelch Sensitivity Tight next 4db please up than 10dB...

Page 11: ...r Supply 7 5V DC Power Supply Figure 3 RF SG Transceiver Program Jig RMS Voltmeter DC Ammnter DC Power Supply 7 5V Figure 1 DVM DC TP1 TP3 Audio SG PC CPS Program Jig Transceiver Dummy Load Spectrum A...

Page 12: ...Elec Capasitor 47u 6V 5x5 C204 Chip Capasitor 100p C205 Chip Capasitor 0 001 C206 Chip Capasitor 0 001 C207 Chip Capasitor 0 1 C208 Chip Capasitor 0 001 C209 Chip Capasitor 1u C210 Chip Capasitor 0 01...

Page 13: ...44 Chip Capasitor 470p C401 Chip Capasitor 220p C402 Chip Capasitor 47p C403 Chip Capasitor 47p C404 Chip Capasitor 100p C405 Chip Capasitor 0 001 C406 Chip Capasitor 6p C407 Chip Capasitor 2p C408 Ch...

Page 14: ...01 C502 Chip Capasitor 0 1 C503 Chip Capasitor 0 1 C504 Alumi Elec Capasitor 47u 6V 5x5 C505 Chip Capasitor 0 1 C506 Chip Capasitor 0 1 C507 Chip Capasitor 0 1 C508 Chip Capasitor 0 1 C509 Chip Capasi...

Page 15: ...0210 CN202 Conector with Wire WC 013 CV301 Chip Trimmer Capasitor 20p T CV302 Chip Trimmer Capasitor 10p T E201 Capacitor microphone CMP 4542 E202 Speaker NR04503N 01 F501 Ceramic filter LTM450HTU J2...

Page 16: ...gital Transistor KRC404 Q310 Var Cap Diode 1SV217 Q311 Transistor KTC4075Y Q312 Zener diode HZK2ALL Q313 Digital Transistor KRC404 Q314 Digital Transistor KRA305 Q315 Var Cap Diode 1SV270 Q316 IC BU4S...

Page 17: ...Resistor 120K R133 Chip Resistor 220 R134 No Mount R135 Chip Resistor 330K R136 Chip Resistor 100K R137 Chip Resistor 0 R138 No Mount R139 Chip Resistor 22K R201 Chip Resistor 4 7K R202 Chip Resistor...

Page 18: ...sistor 10K R404 Chip Resistor 1K R405 Chip Resistor 330 R406 Chip Resistor 1K R407 Chip Resistor 220 R408 Chip Resistor 1 5K R409 Chip Resistor 100 R410 Chip Resistor 220 R411 Chip Resistor 470 R412 C...

Page 19: ...esistor 7 32K R519 Chip Resistor 160K R520 Chip Resistor 100K R521 Chip Resistor 100K R522 Chip Resistor 4 7K R523 Chip Resistor 10K R524 Chip Resistor 100K R526 Chip Resistor 4 7K R527 Chip Resistor...

Page 20: ...meter 47K B RV501 Trimmer potentiometer 10K B RV503 Trimmer potentiometer 10K B S104 Tact switch SQKYAB S105 Tact switch SQKYAB S106 Tact switch SQKYAB S108 Rotaly Code Switch TP70QF4161 SAW401 Saw Fi...

Page 21: ...2 0 5 SCREW 22 SPT t0 2 PA SHIELD CASE 23 SPT t0 2 ANT SHIELD CASE 24 SILICONE BUSHING MIC 25 HSJ1468 01 030 MIC SPK JACK 26 TP76N17N 10KA POTENTIOMETERS 27 TP70QF4161 ROTALY CODE SWITCH 28 SPT t0 2...

Page 22: ...XF401 DRW CHK APR Parts Placement TX 446 Top side PC 4083 Drawing No E23 00390A Date MAR 26 2003 Up Date APR 11 2003 21 SECTION 7 BOARD LAYOUT 7 1 MAIN PCB Top side...

Page 23: ...AW401 J201 APR CHK DRW Parts Placement TX 446 Bottom side PC 4083 Drawing No E23 00391A Date MAR 26 2003 Up Date MAR 26 2003 L305 C318 L304 R340 C306 L302 R304 R307 R311 C313 C340 CN203 CN204 22 Botto...

Page 24: ...DRW CHK APR TX 446 Inner Layer 1 PC 4083 Up Date MAR 26 2003 Date MAR 26 2003 Drawing No E23 00392A 23 Inner Layer 1...

Page 25: ...APR CHK DRW TX 446 Inner Layer 2 PC 4083 Date MAR 26 2003 Up Date MAR 26 2003 Drawing No E23 00393A 24 Inner Layer 2...

Page 26: ...Parts Placement TX 446 SW PCB Top side Date MAR 26 2002 7 2 SWITCH PCB 25 Top side...

Page 27: ...Date MAR 26 2003 Parts Placement TX 446 SW PCB Bottom side 26 Bottom side...

Page 28: ...Parts Placement TX 446 BATT PCB A Top side Date MAR 26 2003 7 3 BATTERY PCB 27 A Top side...

Page 29: ...CB101 WB104 WB103 Parts Placement TX 446 BATT PCB A Bottom side Date MAR 26 2003 28 A Bottom side...

Page 30: ...Parts Placement TX 446 BATT PCB B Top side Date MAR 26 2003 29 B Top side...

Page 31: ...WB105 WB102 RB101 Parts Placement TX 446 BATT PCB B Bottom side Date MAR 26 2003 30 B Bottom side...

Page 32: ...O MASTER DEVIATION CONTROL INTERNAL OR EXTERNAL MICROPHONE LOW PASS FILTER 4 19MHz CLOCK OSCILLATOR EEPROM CHANNEL SELECTOR DCS CTCSS MODULATION AUDIO B SW ADJUST BEEP MUTE LED INDICATOR TX BAT LED RE...

Page 33: ...R202 0 C204 100p Q205 KRA404 Vin 5 GND 2 Vout 1 NC 3 ON OFF 4 Q208 S 814A50AUC BD0 C212 47u 6V 5x5 C213 22u 16V 5x5 C211 0 1 1 7 SW201A TP76N17N 10K A CN203 CONTACTER CN204 CONTACTER C215 0 001 Q210 1...

Page 34: ...ech Co Ltd 1 Title Size Number Date File Revision Sheet of Time A4 TX 446 Battery Drw Chk Apr MAY 7 2002 K Nakamura BB101 GP130AAM6SXZ CB101 0 01 RB101 10K TH T5 T6 T1 T2 T3 T4 QB101 1N4004 To Set To...

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