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HYT POWER446, Service Manual

The HYT POWER446 is a reliable two-way radio designed to deliver exceptional performance in various industries. For thorough understanding and convenient operation, we provide a comprehensive Service Manual. You can easily download the manual for free from our website, manualshive.com, to unlock the full potential of your device.

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POWER446 Service Manual

 

 

23

No.

Part No.

Description

Qty. Ref No. Print No.

175 3001054740000 Chip resistor 470K

Ω

 J 1/16W (RoHS)

1

R642

B2I

176 3001054740000 Chip resistor 470K

Ω

 J 1/16W (RoHS)

1

R648

B3I

177 3001054790000 Chip resistor 4.7

Ω

 J 1/16W (RoHS)

1

R249

B1E

178 3001054790000 Chip resistor 4.7

Ω

 J 1/16W (RoHS)

1

R255

B2E

179 3001055610000 Chip resistor 560

Ω

 J 1/16W (RoHS)

1

R100

T4I

180 3001055630000 Chip resistor 56K

Ω

 J 1/16W (RoHS)

1

R207

B1F

181 3001055630000 Chip resistor 56K

Ω

 J 1/16W (RoHS)

1

R219

T2K

182 3001055630000 Chip resistor 56K

Ω

 J 1/16W (RoHS)

1

R254

B2K

183 3001055630000 Chip resistor 56K

Ω

 J 1/16W (RoHS)

1

R411

T5F

184 3001055640000 Chip resistor 560K

Ω

 J 1/16W (RoHS)

1

R519

T2I

185 3001056810000 Chip resistor 680

Ω

 J 1/16W (RoHS)

1

R405

T5F

186 3001056810000 Chip resistor 680

Ω

 J 1/16W (RoHS)

1

R515

T2G

187 3001058210000 Chip resistor 820

Ω

 J 1/16W (RoHS)

1

R661

T2D

188 3001058220010 Chip resistor 8.2K

Ω

 F 1/16W (RoHS)

1

R234

T4K

189 3001058230000 Chip resistor 82K

Ω

 J 1/16W (RoHS)

1

R253

B3K

190 3001058230000 Chip resistor 82K

Ω

 J 1/16W (RoHS)

1

R264

B4H

191 3001058230000 Chip resistor 82K

Ω

 J 1/16W (RoHS)

1

R307

T5J

192 3001058240000 Chip resistor 820K

Ω

 F 1/16W (RoHS)

1

R232

T3K

193 3001058240000 Chip resistor 820K

Ω

 F 1/16W (RoHS)

1

R240

T4K

194 3001058240000 Chip resistor 820K

Ω

 F 1/16W (RoHS)

1

R440

B4D

195 3001058240000 Chip resistor 820K

Ω

 F 1/16W (RoHS)

1

R705

T3K

196 3001058240000 Chip resistor 820K

Ω

 F 1/16W (RoHS)

1

R706

T3K

197 3001061510000 Chip resistor 150

Ω

 J 1/10W (RoHS)

1

R419

B5C

198 3001070000000 Chip resistor 0

Ω

 J 1/8W (RoHS)

1

L202

B2D

199 3001070000000 Chip resistor 0

Ω

 J 1/8W (RoHS)

1

R413

T5E

200 3005051020010 Integrated resistor 1K J 1/16W (RoHS)

1

RN1

T4J

201 3099080398000 Chip resistor 0.39

Ω

 J 1/4W (RoHS)

1

R420

B4C

202 3099080398000 Chip resistor 0.39

Ω

 J 1/4W (RoHS)

1

R421

B4C

203 3099080398000 Chip resistor 0.39

Ω

 J 1/4W (RoHS)

1

R422

B4C

204 3101050200010 Chip capacitor 2PF B 50V (RoHS)

1

C133

T3G

205 3101050200010 Chip capacitor 2PF B 50V (RoHS)

1

C501

T3D

206 3101050200010 Chip capacitor 2PF B 50V (RoHS)

1

C535

T2F

207 3101050200010 Chip capacitor 2PF B 50V (RoHS)

1

C561

T2H

208 3101050300000 Chip capacitor 3PF B 50V(RoHS)

1

C137

T3H

209 3101050300000 Chip capacitor 3PF B 50V(RoHS)

1

C500

T4D

210 3101050300000 Chip capacitor 3PF B 50V(RoHS)

1

C505

T3D

211 3101050300000 Chip capacitor 3PF B 50V(RoHS)

1

C560

T2H

212 3101050400010 Chip capacitor 4PF B 50V(RoHS)

1

C516

T3E

213 3101050400010 Chip capacitor 4PF B 50V(RoHS)

1

C532

T3F

214 3101050500010 Chip capacitor 5PF B 50V(RoHS)

1

C136

T3H

215 3101050500010 Chip capacitor 5PF B 50V(RoHS)

1

C138

T3H

216 3101050500010 Chip capacitor 5PF B 50V(RoHS)

1

C518

T2F

217 3101050590020 Chip capacitor 0.5PF B 50V(RoHS)

1

C400

T3F

218 3101050600010 Chip capacitor 6PF B 50V(RoHS)

1

C111

T5H

 

Summary of Contents for POWER446

Page 1: ...POWER446 ...

Page 2: ...rols 3 Software Specifications 4 Circuit Description 7 CPU Pins 15 Parts List 1 19 Tuning Description 34 Troubleshooting Flow Chart 42 Disassembly and Assembly 45 Exploded View 47 Parts List 2 48 Packing Guide 50 PCB View 51 Level Diagram 53 Block Diagram 54 Schematic Diagram 55 Specifications 58 ...

Page 3: ...to its computer programs The purchase of this product shall not be deemed to grant either directly or by implication any rights to the purchaser regarding the Company s computer programs Any of the Company s computer programs may not be copied modified distributed decompiled or reverse engineered in any manner without the prior written consent of the Company Disclaimer The Company endeavors to ach...

Page 4: ...POWER446 Service Manual 2 Product Overview Intended User This manual is intended for use by qualified technicians only ...

Page 5: ... Part Name No Part Name 1 PTT Key 2 SK1 programmable 3 SK2 programmable 4 Speaker 5 Microphone 6 Antenna 7 LED Indicator 8 Channel Selector Knob 9 Radio On Off Volume Control Knob 10 Battery Latch 11 Accessory Jack 12 Accessory Jack Cover 13 Belt Clip 14 Battery 15 Screw Belt Clip 16 Charging Piece ...

Page 6: ...ta version and serial No and etc 2 Factory Clone Mode Firstly make sure that the SELF pin of MCU on the source radio is grounded correctly and then connect two radios using a clone cable Power on the source radio while holding down SK2 and it will enter Factory Clone Mode after 2 seconds The target radio can be directly turned on to enter the User Mode The data transferred involves all data in EEP...

Page 7: ...between TX tuning items and RX tuning items Rotate the Channel Selector knob to CH16 and long press PTT key to switch between TX group and RX group The LED glows red in TX group The LED glows green in RX group 3 To switch between tuning items within TX group RX group This operation is done through the Channel Selector knob TX group CH1 to CH14 respectively represent TX Preset Power TX Low Power TX...

Page 8: ...several special items TX group CH9 to CH14 stand for VOX Level 1 VOX Level 2 VOX Level 3 VOX Level 4 VOX Level 5 and TX Low Voltage Threshold respectively These tuning items are related to AD sampling Press SK1 or SK2 after entering the above items to activate AD sampling including calculation once Rotate the Channel Selector knob to save the current AD sampling value RX group CH1 to CH7 stand for...

Page 9: ... 0 KHz or 12 5 KHz reference frequencies via a fixed counter The signal from the VCO enters U202 after processed by the buffer Q102 and amplifier Q103 and then it is applied to the variable frequency divider in PLL for division After division the signal is compared with the reference frequency at a phase detector PD in PLL The signal from the PD passes through a low pass filter and then is applied...

Page 10: ...iers Q400 and Q401 in sequence Then the amplified RF signal goes to Q402 which pre amplifies power of the input signal to drive the final stage power amplifier Q403 The input RF signal is then further amplified by Q403 and goes to the LC low pass filter LPF through the TX RX switching diode D401 Finally it is transmitted from the antenna after high order harmonics are removed by LPF 3 RX Amplifier...

Page 11: ...al to provide the first IF signal for frequency discrimination by the demodulator chip The mixer Q501 employs a dual gate MOSFET 3SK318 for better noise control and square law performance as well as high isolation degree between the local oscillator signal and the RX signal In addition the mixer has a certain gain adjustable via offset so as to assure sufficient sensitivity After residual spurious...

Page 12: ...k control power is generated when the TX current changes 5 Audio and Signaling Processing Circuit The baseband processor AN29160 is highly integrated and has multiple functions such as VOX Level Detect Output SQ Level Detect Output RX TX Audio Process Convert Audio Amplify etc In addition it can be used for both transmission and reception 1 TX Audio Signaling Process D104 Q100 2SK508NV TX VCO cpu ...

Page 13: ...naling and voice components Therefore audio is processed as follows a RX audio processing One flow of audio signal from U200 goes back to U200 after passing through the RC low pass filter and de emphasis circuit This flow of audio signal is amplified at U200 and restored after frequencies below 300Hz are removed The restored audio signal is adjusted by the potentiometer and then applied to the aud...

Page 14: ...omposed of MCU EEPROM reset IC keys and knobs etc This section has the following functions 1 Signal Control To control Battery Save Mode To control narrow band To control TX RX switch To control APC TUNE output voltage To control power supply of transmitter and audio amplifier To control SQL Off detection 2 Signal Detect To detect startup of external PTT MONI and VOX To detect PLL Unlock To detect...

Page 15: ... be controlled alternately In addition to meet requirements of battery save mode MCU needs to output a pulse signal SAVE control signal with fixed duty ratio If the SAVE control signal is at high level Q610 is turned on and provides the 5V voltage V_SAVE for the operating circuit PLL and RX circuit If the SAVE control signal is a pulse signal the radio will enter Battery Save Mode During transmiss...

Page 16: ...d into the accessory jack Q201 is cut off and MIC_EN switches from low level to high level Meantime Q202 and R204 form a loop circuit with the external earpiece Q202 is conductive and EXT PTT switches from low level to high level In this case the VOX earpiece is determined by MCU and the VOX function is enabled When the VOX level 5 selectable levels gets to the preset value transmission is initiat...

Page 17: ...n resistor valid at high level 6 PE0 INT10 B_KEY I SK2 input pin connected with external pull up resistor valid at low level 7 P83 ENC3 I 8 P82 ENC2 I 9 P81 ENC1 I 10 P80 ENC0 I Channel Selector knob input pin connected with external pull up resistor 11 P71 TI0 T R O For TX RX switch control High RX Low TX 12 P70 TO0 Reserve O Reserved 13 MOD Programming I During programming this pin is used to co...

Page 18: ... O 24 P02 INT02 Reserve O 25 P03 INT03 Reserve O Reserved 26 P04 INT04 PLLEN2 O PLL enable pin 27 P05 INT05 PLLDATA2 O PLL data pin 28 P06 INT06 PLLCLK2 O PLL clock pin 29 P07 INT07 UL2 I For detection of PLL circuit TB31202 H locked L unlocked connected with external pull up resistor 30 P10 UI0 RXD I UART RX pin During programming this pin is connected to UI 31 P11 UO0 TXD O UART TX pin During pr...

Page 19: ...G11 PLLDATA O PLL data pin 46 P62 TO10 PLLEN O PLL enable pin 47 P63 TO11 Reserve O Reserved 48 P64 EC1 Reserve O Reserved 49 P65 SCK Reserve O Reserved 50 P66 SOT Reserve O Reserved 51 P67 SIN Self I Test pin used for Factory Clone Mode connected with pull up resistor 52 P43 AN11 SPCNT O Power control pin for main audio valid at high level 53 P42 AN10 PCONT O Power control pin for AN29160AA 54 P4...

Page 20: ...POWER446 Service Manual 18 61 P32 AN02 Reserve O Reserved 62 P31 AN01 Reserve I AD VOX detection input pin 63 P30 AN00 Reserve Reserved 64 AVss GND For grounding ...

Page 21: ...1 R202 B1D 20 3001051010040 Chip resistor 100Ω F 1 16W RoHS 1 R540 T2G 21 3001051010040 Chip resistor 100Ω F 1 16W RoHS 1 R653 T4G 22 3001051010040 Chip resistor 100Ω F 1 16W RoHS 1 R654 T4G 23 3001051010040 Chip resistor 100Ω F 1 16W RoHS 1 R660 B5J 24 3001051010040 Chip resistor 100Ω F 1 16W RoHS 1 R697 B4J 25 3001051010040 Chip resistor 100Ω F 1 16W RoHS 1 R698 B4J 26 3001051020000 Chip resisto...

Page 22: ...696 B3J 63 3001051040000 Chip resistor 100KΩ F 1 16W RoHS 1 R208 B1F 64 3001051040000 Chip resistor 100KΩ F 1 16W RoHS 1 R260 B4I 65 3001051040000 Chip resistor 100KΩ F 1 16W RoHS 1 R262 B4H 66 3001051040000 Chip resistor 100KΩ F 1 16W RoHS 1 R266 T4H 67 3001051040000 Chip resistor 100KΩ F 1 16W RoHS 1 R311 T2I 68 3001051040000 Chip resistor 100KΩ F 1 16W RoHS 1 R501 T3D 69 3001051040000 Chip resi...

Page 23: ...R224 T2K 107 3001051830000 Chip resistor 18KΩ J 1 16W RoHS 1 R233 T4K 108 3001051830000 Chip resistor 18KΩ J 1 16W RoHS 1 R239 T4K 109 3001051840000 Chip resistor 180KΩ J 1 16W RoHS 1 R107 T4G 110 3001051840000 Chip resistor 180KΩ J 1 16W RoHS 1 R238 T4K 111 3001051840000 Chip resistor 180KΩ J 1 16W RoHS 1 R316 T3I 112 3001051850000 Chip resistor 1 8MΩ J 1 16W RoHS 1 R228 T3K 113 3001052200010 Chi...

Page 24: ...oHS 1 R203 B1F 151 3001054720000 Chip resistor 4 7KΩ J 1 16W RoHS 1 R231 T3K 152 3001054720000 Chip resistor 4 7KΩ J 1 16W RoHS 1 R412 T5F 153 3001054720000 Chip resistor 4 7KΩ J 1 16W RoHS 1 R441 B4J 154 3001054720000 Chip resistor 4 7KΩ J 1 16W RoHS 1 R442 B4J 155 3001054720000 Chip resistor 4 7KΩ J 1 16W RoHS 1 R651 T5G 156 3001054720000 Chip resistor 4 7KΩ J 1 16W RoHS 1 R699 B4J 157 300105472...

Page 25: ...r 820KΩ F 1 16W RoHS 1 R440 B4D 195 3001058240000 Chip resistor 820KΩ F 1 16W RoHS 1 R705 T3K 196 3001058240000 Chip resistor 820KΩ F 1 16W RoHS 1 R706 T3K 197 3001061510000 Chip resistor 150Ω J 1 10W RoHS 1 R419 B5C 198 3001070000000 Chip resistor 0Ω J 1 8W RoHS 1 L202 B2D 199 3001070000000 Chip resistor 0Ω J 1 8W RoHS 1 R413 T5E 200 3005051020010 Integrated resistor 1K J 1 16W RoHS 1 RN1 T4J 201...

Page 26: ...1051000020 Chip capacitor 10PF J 50V RoHS 1 C541 T2G 240 3101051000020 Chip capacitor 10PF J 50V RoHS 1 C543 CT2F 241 3101051010030 Chip capacitor 100PF J 50V RoHS 1 C107 T5I 242 3101051010030 Chip capacitor 100PF J 50V RoHS 1 C201 T1F 243 3101051010030 Chip capacitor 100PF J 50V RoHS 1 C206 T3K 244 3101051010030 Chip capacitor 100PF J 50V RoHS 1 C266 B4H 245 3101051010030 Chip capacitor 100PF J 5...

Page 27: ...oHS 1 C685 B5J 283 3101051020010 Chip capacitor 1000PF K 50V RoHS 1 C686 B2I 284 3101051020010 Chip capacitor 1000PF K 50V RoHS 1 C689 B4I 285 3101051030020 Chip capacitor 0 01UF K 25V RoHS 1 C237 T3K 286 3101051030020 Chip capacitor 0 01UF K 25V RoHS 1 C259 B2E 287 3101051030020 Chip capacitor 0 01UF K 25V RoHS 1 C274 B1F 288 3101051030020 Chip capacitor 0 01UF K 25V RoHS 1 C277 B4K 289 310105103...

Page 28: ...16V RoHS 1 C333 B1I 327 3101051040060 Chip capacitor 0 1UF K 16V RoHS 1 C409 T4E 328 3101051040060 Chip capacitor 0 1UF K 16V RoHS 1 C415 T4D 329 3101051040060 Chip capacitor 0 1UF K 16V RoHS 1 C418 B4C 330 3101051040060 Chip capacitor 0 1UF K 16V RoHS 1 C433 B4D 331 3101051040060 Chip capacitor 0 1UF K 16V RoHS 1 C511 T3F 332 3101051040060 Chip capacitor 0 1UF K 16V RoHS 1 C515 T3F 333 3101051040...

Page 29: ...F 371 3101051820000 Chip capacitor 1800PF K 50V RoHS 1 C235 T3K 372 3101051830000 Chip capacitor 0 018UF K 16V RoHS 1 C207 T3K 373 3101052200010 Chip capacitor 22PF J 50V RoHS 1 C245 T4K 374 3101052210010 Chip capacitor 220PF K 50V RoHS 1 C260 B1D 375 3101052210010 Chip capacitor 220PF K 50V RoHS 1 C275 B1C 376 3101052220010 Chip capacitor 2200pF K 50V RoHS 1 C243 T4K 377 3101052220010 Chip capaci...

Page 30: ...1 C538 T2G 415 3101054710010 Chip capacitor 470PF K 50V RoHS 1 C539 T1G 416 3101054710010 Chip capacitor 470PF K 50V RoHS 1 C601 T2B 417 3101054710010 Chip capacitor 470PF K 50V RoHS 1 C602 T2B 418 3101054710010 Chip capacitor 470PF K 50V RoHS 1 C648 B3A 419 3101054710010 Chip capacitor 470PF K 50V RoHS 1 C649 B2A 420 3101054710010 Chip capacitor 470PF K 50V RoHS 1 C654 T5G 421 3101054710010 Chip ...

Page 31: ... 0 5PF B 50V RoHS 1 C426 T5C 461 3101061000000 Chip capacitor 10PF J 50V RoHS 1 C423 T4D 462 3101061010010 Chip capacitor 100PF J 50V RoHS 1 C450 T4C 463 3101061020000 Chip capacitor 1000PF K 50V RoHS 1 C458 T5C 464 3101061050020 Chip capacitor 1UF K 25V RoHS 1 C246 B3J 465 3101061050020 Chip capacitor 1UF K 25V RoHS 1 C247 B1E 466 3101061050020 Chip capacitor 1UF K 25V RoHS 1 C308 B3I 467 3101061...

Page 32: ...p inductor3 3uH K 15mA 1 55Ω RoHS 1 L108 T4G 502 3213306332000 Multi layer chip inductor3 3uH K 15mA 1 55Ω RoHS 1 L109 T4H 503 3213306332000 Multi layer chip inductor3 3uH K 15mA 1 55Ω RoHS 1 L305 T3I 504 3221506601000 Bead600Ω 100MHz 25 500mA RoHS 1 L100 T5I 505 3221506601000 Bead600Ω 100MHz 25 500mA RoHS 1 L402 T4F 506 3221506601000 Bead600Ω 100MHz 25 500mA RoHS 1 L650 T4G 507 3221507221000 Bead...

Page 33: ...2D 548 3499000000180 PNP transistor 12V 2 5A RoHS 1 Q610 T2E 549 3499000000180 PNP transistor 12V 2 5A RoHS 1 Q611 T2D 550 3501020000030 N MOSFET VDS 6V ID 20mA VGS th 0 7V RoHS 1 Q501 T2G 551 3503010000010 P MOSFET VDS 30V ID 100mA VGS th 1 9V RoHS 1 Q653 T4G 552 3503020000030 N MOSFET VDS 30V ID 100mA VGS th 3 0V RoHS 1 Q201 B1F 553 3503020000030 N MOSFET VDS 30V ID 100mA VGS th 3 0V RoHS 1 Q203...

Page 34: ...0 Tantalum capacitor4 7uF K 16V RoHS 1 C101 T4I 592 3104071560040 Tantalum capacitor15UF M 6 3V RoHS 1 C312 B2I 593 3001051250000 Chip resistor 1 2M J 1 16W RoHS 1 R217 T2J 594 3001052210000 Chip resistor 220Ω J 1 16W RoHS 1 R709 T3K 595 3001055600000 Chip resistor 56Ω J 1 16W RoHS 1 R105 T5G 596 3101060700020 Chip capacitor 7PF B 50V RoHS 1 C422 T4D 597 3101061200000 Chip capacitor 12PF J 50V RoH...

Page 35: ...Wire wound chip inductor 330nH J 400mA 0 6Ω RoHS 1 L509 T2G 636 3217105010000 Wire wound chip inductor 1nH J 1360mA 0 045Ω RoHS 1 R521 T3E 637 3217106829010 Wire wound chip inductor 8 2nH G 700mA RoHS 1 L505 T2F 638 3217112102020 Wire wound chip inductor 1uH J 370mA 1 75Ω RoHS 1 L510 T1G 639 3231351650000 Air core inductor E2 0 35 1 6 5TL RoHS 1 L501 T3D 640 3231351650000 Air core inductor E2 0 35...

Page 36: ...ftware or through wired clone If any adjustment is required connect the programming cable to the radio and enter the tuning mode for PC adjustment 2 Radio Tuning Rotate the Channel Selector knob to CH1 and hold down PTT and SK2 for 1 5 seconds while powering on the radio The LED will glow orange when the radio enters the Tuning Mode After the keys are released the radio will enter the default tuni...

Page 37: ...Y 6 SQL Off 9 Y Y Y Y Y 7 RX Low Voltage Threshold Y 8 Bandpass Filter Y Y Y Y Y Note Y indicates frequencies available for tuning and the rest are blank channels without tuning items 3 Specific Operations and Requirements 1 Tuning outside the mode conventional tuning items TX Frequency Tolerance VCO Lock Voltage Maximum Deviation and Modulation Sensitivity Note CH1 CH2 and CH3 have been preset as...

Page 38: ...tool until the lock voltage meets the requirements 1 1 1 3V RX VCO Lock Voltage Set to CH3 Digital Voltmeter CV TC101 Check 1V Maximum Frequency Deviation Narrow Band Set to CH1 CH2 and CH3 respectivel y and hold down PTT to transmit Communicat ion Test Set BFP 20Hz 15k Hz AF 1kHz 150mV VR200 Tune VR200 with ceramic tuning tool until the frequency deviation satisfies the requirements 1 8 2 1KHz Mo...

Page 39: ... frequencies refer to the table of Tuning Items Communicatio n Test Set Ammeter Antenna Connector SK1 SK2 Press SK1 or SK2 to tune the output power and rotate the Channel Selector knob to save it 0 5W 0 1W I 0 8A CDCSS Waveform Set to CH5 and hold down PTT to enable this function at low frequency Short press PTT to switch frequencies VR260 Tune VR260 with ceramic tuning tool and make the waveform ...

Page 40: ...s function Communicatio n Test Set BPF 20Hz 15kHz AF 1kHz 10mV Apply SK1 or SK2 to perform tuning and rotate the Channel Selector knob to save it after one point tuning Set to CH11 and VOX Level 2 Press SK1 or SK2 to enable this function Communicatio n Test Set BPF 20Hz 15kHz AF 1kHz 6mV Apply SK1 or SK2 to perform tuning and rotate the Channel Selector knob to save it after one point tuning VOX S...

Page 41: ...rt tone will sound to indicate transmission inhibition if PTT is held down Set to CH8 at low frequency RX Sensitivity Bandpass Short press PTT to switch frequencies Communicatio n Test Set SSG 119dBm MOD 1KHz DEV 3 0KHz Filter 0 3 3KHz Antenna Earpiece Socket SK1 SK2 Check the bandpass waveform Apply SK1 or SK2 to perform tuning and rotate the Channel Selector knob to save it after five point tuni...

Page 42: ...rt press PTT to switch the frequency Communicatio n Test Set SSG 115dBm MOD 1KHz DEV 1 5KHz Filter 0 3 3KHz Antenna Earpiece Socket SK1 SK2 Tune the SSG output signal to squelch level Rotate the Channel Selector knob to save the value after five point tuning Squelch level Level 9 SINAD 17 1dB RX Low Voltage Threshold Digital Voltmeter Power Supply Port Power supply Tune the output voltage and chec...

Page 43: ...1 125 128 131 135 69 72 72 75 77 CTCSS Deviation 151 8Hz 121 124 126 128 131 68 70 72 73 75 CTCSS Deviation 254 1Hz 133 135 137 140 143 75 77 78 78 81 VOX Level 1 55 VOX Level 2 45 VOX Level 3 25 VOX Level 4 19 VOX Level 5 15 TX Low Voltage Threshold 158 SQL On 1 27 25 27 25 24 18 18 17 17 20 SQL On 5 21 19 19 18 19 14 13 13 13 14 SQL On 9 9 9 9 9 9 7 7 7 7 7 SQL Off 1 39 30 31 32 32 27 26 24 25 2...

Page 44: ...pply LED of D602 glows red Check the TX power supply TX VCO locked Check the TX VCO Check the TX channel Replace D602 No sound LED fails to glow flash Check the antenna Check Q400 Q401 Q402 and Q403 Yes No Check the APC circuit Low TX power Check the voice channel MIC VR200 D104 Replace D602 Yes No No Yes ...

Page 45: ...rocessor U200 output signals normally The modulation parts work normally IF mixer circuit works normally RF mixer circuit works normally Change the RX frequency Change the RX SQL level Replace the RX LED D601 Change the RX signaling Replace the speaker Check the audio amplifier circuit Replace the Volume Control knob Check audio processing circuit Check and replace CD300 and CF300 Check Q105 U200 ...

Page 46: ...he speaker works normally Yes No Yes No Clock crystal X601 of MCU works normally Normal VCC operating voltage of MCU Yes No Check U606 Replace X601 No Yes Other pins control normally MCU works normally Yes No Check pin connection or reprogram Replace the speaker ...

Page 47: ...ctor knob Unscrew the nut for the volume control knob Unscrew the nut for the channel selector knob Unfasten the two screws at the bottom of the radio Figure 1 Lift the bottom of the aluminum chassis pull the aluminum chassis backwards and take it out Remove the rear cover Figure 2 The disassembled parts are shown as figure 3 5 5 4 3 2 1 7 6 ...

Page 48: ...POWER446 Service Manual 46 Figure 3 Assembling the Aluminum Chassis To assemble the aluminum chassis please perform the above steps in a reverse way ...

Page 49: ...POWER446 Service Manual 47 Exploded View 5 8 9 13 16 12 11 20 22 19 18 3 4 2 44 42 39 41 32 34 35 28 27 26 38 17 30 31 36 15 14 33 45 43 6 1 37 23 29 25 10 40 21 7 24 46 ...

Page 50: ...0032000000 Metal dome for PTT key 00 RoHS 1 18 5205000001000 Battery connector RoHS 1 19 6100314000000 Waterproof ring for battery connector 00 RoHS 1 20 7103006001000 Machine screw 00 RoHS 2 21 7500116000020 Heat sink pad 02 RoHS 1 22 7102005000000 Machine screw 00 RoHS 2 23 6000843100000 Rear cover 00 RoHS 1 24 7400218000000 Waterproof and dustproof breathable film 00 RoHS 1 25 7102508000010 Mac...

Page 51: ... 1 41 6000848000010 Earpiece jack cover 01 RoHS 1 42 6000847000000 Light guide 00 RoHS 1 43 6100334000000 O ring for encoder switch 00 RoHS 2 44 7207002200200 Nut 00 RoHS 2 45 6202157000000 Inner lining of volume control knob 00 RoHS 1 46 6000846100010 Volume control knob 01 RoHS 1 ...

Page 52: ...POWER446 Service Manual 50 Packing Guide ...

Page 53: ......

Page 54: ......

Page 55: ...5M Q500 AT41511 Q500 AT41511 Q401 2SK4988 Q401 2SK4988 1 2 3 Q501 3SK318 Q501 3SK318 3 2 4 1 IFAmp 1 AF HPF Volume MIX2 2ndIF BPF IFAmp 2 DET de emphasis 23 25 29 44 AF mute AN29160 IFAmp 1 AF HPF Volume MIX2 2ndIF BPF IFAmp 2 DET de emphasis 23 25 29 44 AF mute AN29160 52 21 Q400 2SC5108 Q400 2SC5108 1 2 3 C405 C405 BPF BPF C C C400 C400 SW SW MICROPHONE MICROPHONE C141 C141 RD01 Q402 RD01 Q402 2...

Page 56: ...REG mic mute RF PA TX Vcc VCC LIM TX Q610 TXC TX VCO AUDIO OUT From MCU SQ LPF D601 LIGHTING 1 2 32 33 17bitDIV 21bitDIV 1 2 OSC CP U202 Pre Emphasis RX PLLEN PLLDATA PLLCLK 3 TC 610 620 UHF BLOCK DIAGRAM AF AMP Q502 U430 7 3728M 7 3728M green green 7 5V 7 5V L101 L101 Q6 Q6 1 2 3 Q400 Q400 1 2 3 L102 L102 SW SW 1 2 3 C504 C504 16Ω IW 16Ω IW PTT PTT 2 1 3 Q101 Q101 Q104 Q104 1 2 3 38 85MHZ 38 85MH...

Page 57: ...02 10K R302 10K C316 470p C316 470p R318 0 R318 0 R236 3 3K R236 3 3K R210 NC R210 NC R219 56K R219 56K C226 1U C226 1U C337 470P C337 470P L303 330NH L303 330NH C341 1000 P C341 1000 P C217 0 1U C217 0 1U R247 10 R247 10 U201 TDA2822D U201 TDA2822D O1 1 VCC 2 O2 3 GND 4 2IN 5 2IN 6 IN 7 IN 8 D210 EDZ6 8B D210 EDZ6 8B J3 PJ D3027D J3 PJ D3027D 1 5 2 4 3 R229 120K R229 120K C255 0 1U C255 0 1U R237...

Page 58: ...00K R647 100K R701 330K R701 330K C685 1000P C685 1000P C662 0 01U C662 0 01U C642 0 1u C642 0 1u C681 0 01u C681 0 01u Q613 UMG3N Q613 UMG3N C689 1000P C689 1000P B B 2 1 C679 3900P C679 3900P C656 0 01U C656 0 01U C684 1000p C684 1000p R697 100 R697 100 C682 47u 16V C682 47u 16V C658 1000p C658 1000p C661 1000p C661 1000p R636 47K R636 47K R648 470K R648 470K R641 47K R641 47K U605 MB95F108AMWPF...

Page 59: ...SK1824 2 3 1 C445 470P C445 470P Q650 2SC5343 Q650 2SC5343 2 3 1 L510 1u L510 1u C100 0 22U C100 0 22U R509 100K R509 100K R416 15K R416 15K L501 5T L501 5T C522 10P C522 10P L650 601s L650 601s R405 680 R405 680 R408 10 R408 10 R652 100K R652 100K R513 47k R513 47k C116 0 3P C116 0 3P C123 6P C123 6P C461 3p C461 3p U430 NJM2904 U430 NJM2904 1 3 4 2 5 7 8 6 L401 22N L401 22N L103 3 3U L103 3 3U C...

Page 60: ... Stability 2 5ppm Receiver Sensitivity 0 282uV Adjacent Channel Selectivity 60dB Intermodulation 60dB Spurious Response Rejection 70dB Rated Audio Power Output 800mW Rated Audio Distortion 5 800mW Transmitter RF Power Output 0 5W Spurious and Harmonics 36dBm frequency 1GHz 30dBm frequency 1GHz Modulation Limiting 2 5KHz Modulation Distortion 5 Note All Specifications are tested according to TIA EI...

Page 61: ...8130044600200 http www hytera com ...

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