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TC-320 Service Manual 00 (RoHS)

1. V_BAT C603 C602 4 7410 0 1u G601 r 1000 R314 C301 0 0 33u M V BAT MC34673 L C311 1 8 1 C606 C651 BAT 4 7 10 1000p R315 R302 1053 C640 NC 1000 L 0608 2026 88 4 4890 205 0201 603 SP 2 NC fs 604 1 R605 R625 vot 2 UP c REEN 202
2. VR 5 ANN x 23 507 R526 180P 82 is L505 100nH L516 C523 39nH 100 SAWF503 1 C530 C525 C524 L510 HDF460A L514 C545 R528 15p NC 4TOp 0 12nH 1 12k R525 1 4 C517 ST To R516 22P 10 m 1 527 1507 RF IN 9503 1 L512 NC 41511 NC 1503 33n R529 T 1 6 8k R527 C535 C539 0 1509 C538 C540 1000P 5 R517 2 2uH 22p 0 01u TX OUT 8 R210 Im 0505 d 10k C534 L511 C544 25 4226 C546 0 3p 15nH 4 7 C541 MIC we 1000p 1000p C213 R211 C212 C211 428212 0 22u 5 6k 0 022u 10p 470k ond R220 4 7u 10V C542 R518 1 2k C210 R530 10 4 V_SAVE EE R507 C520 R505 2 2k R120 L C122 C547 330 oriu 10k 100 85 au 526 gt 0 33p 858 88888 8 25555595520 XF501 R506 57 21 7MHz 330 R501 Q504 1 ANA 680k 4 25 5108 VCO IN RF OUT 2 VDET 0501 RSSI REF wees gt 1k PLL GND RX LO NC NC cp JTB32303 AS SEI STB 1 8 CLK 2nd MIX OUT 24 24 2 STB VCC1 D506_EDZ6 8B 31 5 DATA 2nd MIX IN LD PLL VCC IF DEC SIG OUT IF IN LEYM450F 6 0K R121 XB NC m 6 0K V SAVE 0124 52125 121 5
3. 404 1405 1408 416 R414 425 0401 C427 C431 C433 W401 47p 4 7nH 4 7nH 1000 185356 1000 1 5 2 Op ANTENNA sj MN 4I 0402 4 0415 0403 4 0418 C421 C423 R404 C409 25 3078 RQA0002DNS 56p 4p 18 2 ra 330 L401 1409 1411 505 0401 i 4 1 dr 5T 0 56 T 28 4226 2enH H raul ANTG 1415 Rato 4 8415 J C428 C430 C432 C434 E R412 7 els VT R418 2p 47 3 6p 5p 22k 100 Sen 4 AA n C436 C437 C440 E ie EM 412 1000 R416 Lato 278 00141 479 R403 R411 EM 22k 1 600sq 470p 3T 4 7 1000 22k d 0424 077 ae a 1417 2215 i z 6015 1 bom 0601 L402 b T9 1 R425 T R421 C441 C442 R423 150 196 C446 C422 C439 F W 4TU10V AM 470p V_SAVE D104 0101 L106 6 0 39S 0 39 d 28111 2SC5343E 6015 R424 4103 1401 R428 0404 E D402 124 2 4 450k 1 6 1 NJM2904 10k 0 550 26 88 C138 6139 R112 5 ia P 8 gr 3 AAA 2 4 ane ae yji 5 1416 R422 470p lt gt R405 hooop T 150 22nH 150k 1 C444 1M 100p Arop 51 2 7 EOM t di R426 R427 116445 R408 R409 C140 10
4. ECO EC2 CH SW 1 R_LED D601 2 PTT ON OF T LED D602 KEY SW E gt jp 2 B30 MON UP DOW a 1 Speaker AMP 2 OUTP T_OUT L N C U601 U301 EXT PTT LD Q201 gt lt K EXT MIC 0202 RXD EMOD ur 2202 PA EN e IC IN TXD OD OUT 8303 R T H 5 BUSY SQL a 2 9 9201 2 Mic B 9 V BAT 0603 R602 0604 R603 sw VT 0605 PM RESET V VCC 4 0602 T gt N 2601 VR BATTERY V_SAVE E I 21 n 1 2 2 1 MCU Control Circuit MCU control circuit is composed of MCU EEPROM LCD exclusive for TC 320 keys etc This section has the following functions to initialize data of the radio and save data to EEPROM to drive LCD to display some user set information and status to detect battery voltage and signals from external keys LD and VOX DET and to make response to transmit required data to PLL based on the channel encoding status to switch and control Rx Tx based on the input PTT signal to switch the squelch circuit on off based on the input signaling decode signal and squelch level signal to control circuits of high low power switch audio power amplifier VCO power supply Rx power supply and Tx power supply for programming to communicate with PC via RXD TXD based on the RS232 protocol and transmit r
5. VR L505 100nH 100P SAWF503 T C530 C524 L510 HDF460A L514 C545 15p 470p 0 10nH 3p 1 4 C517 T R516 27 10 1507 RF IN Q503 1512 NC AT 41511 NC 1503 33n T 1 R527 C539 0 L509 C538 C540 1000 4 1 R517 2244 22p e TX OUT 0518 0 1 0508 C534 L511 2504226 546 0 3p 15nH C541 213 R211 212 1000p 2 0 22u 5 6k 0 022u R519 1508 NC amp ow 4 C542 R548 R530 10 V_SAVE T R507 C520 R505 gt 2 2k mi MET 547 330 40k 100 44533 du AN C526 33p 21 52022 31 5 gt 9 9 90 gt 8501 9504 4 680 1 28 5108 dh b C531 U501 1k SI JTB32303 AS 2 1 sre ae x dd 5 0506 2688 19 lt lt ss AL CF501 EET LFYM450F 6 0K V_SAVE 124 5 100p 100p 5 OZ 4 4 pd EFE REIS PET i 543 601s 025002 E JTBM450C24 1303 4 T cpso1 4 R101 L107 L110 102 10 1uH 1000p R304 8 XT101 1 C103 C104 ie C519 8 11 VW NAVA 0 22u C120 12 4 10 ge IU s 21 25MHz 0 22 33p 1 C307 3 3k 8 R306 470p 27k
6. 125 VR101 68k 4 684 2 R307 3 3k 132 R103 1 4 7110 47k QT_OUT gt gt VW 1 6310 4700P TC 320U 2 VF Schematic Diagram PLL vs VR C517 1000p R526 220 C507 C525 R516 15p 470p 10 i RF IN 2 SAWF503 1 L510 HDF460A 1514 0545 m 0 15nH 1p 1 4 m C539 1509 C538 0540 1000 L512 L507 R517 22uH 22 0010 NC NC 5 C524 470p zal R210 9505 10k C534 L511 C544 25 4226 gt 0 3p 15nH 213 211 212 I C211 428212 1 1 TP502 0 22u 5 6k 0 022u 10p 470 3 R519 MIX L508 N T AM 1 4 1508 d R220 C210 C542 R518 12k 4 7u 10V 216 V_SAVE 1 R507 C520 R505 gt 2 2k im C518 270 C526 25252080850578 33 48 3885 588588 638792 c XF501 R506 WA 11 21 7MHz 270 R501 Q504 SPL OUT RF VCC 25 5108 21 SW RF OUT 1 T 1 3 VCO IN 40 c532 RN101 4 RSSI REF
7. 60 PACKING 62 320 VF PCB View Layer uuu rz na arua u 63 TC 320 VF PCB View Bottom Lage riii cor rro e eO Ra a Ee 64 TC 320 VG PCB View Top 22 2 Cori agas iia ER DU PR KR RR RR 65 320 VG PCB View Bottom 66 16 320 Level Diagrami 67 320 Block 4 rana sun da iugo 68 TC 320 Schematic Diagram RP oriri tr uu J 69 TC 320 Schematic Diagram CPU 70 TC 320 U1 VF Schematic Diagram PLL J J 71 HVT TC 320 Service Manual 320 U1 VG Schematic Diagram PLL 72 320 U2 VF Schematic Diagram PLL J J 73 TC 320 02 VG Schematic Diagram PLL 74 jen t 75 HVT TC 320
8. 210305390000 Multilayer chip inductor S9nH 4 LQG15HS39NJ02 RoHS Chip capacitor 0402 470PF K 13 3101054710010 C525 T2H 1 None None C525 T2H 0 50V RoHS Chip capacitor 0402 1PF B 14 None None C527 T2H 3101050100030 527 T2H 1 50 Chip capacitor 0402 0 1UF 15 None C536 B2G 0 3101051040060 C536 B2G 1 16W RoHS Chip resister 0402 2200 J Chip resister 0402 820 F 16 3001052210000 R526 B3G 1 3001058200000 R526 B3G 1 1 16W RoHS 1 16W RoHS 17 None None R530 B2G O 3001051000020 Chip resister 0402 100 F 1 16W R530 B2G 1 18 None None R634 BBA o 3001064710000 resister 0603 4700 J R634 BSA 1 1 10W RoHS 19 N N R609 B5A 0 3001064710000 R609 B5A 1 oe 4 40W RoHS 20 N C651 T4D 0 3101051020010 C651 T4D 1 one ne 5 50V RoHS Chip capacitor 0402 0 1UF K 21 None 220 T3D 0 3101051040060 C220 T3D 1 16W RoHS Chip ferrite bead 0805 22 None None L607 0 3221507600000 1607 TAB 1 600 25 100MHz RoHS Chip resister 0402 8 2 J 23 R606 T4C 0 3001058220000 R606 T4C 1 1 16W RoHS Chip capacitor 0402 470PF K Chip capacitor 0402 100PF J 24 3101054710010 C512 B1E 1 3101051010030 C512 B2B 1 50V RoHS 50V RoHS Switching diode HVC131TRF E Switching diode HVC131TRF E 25 3303060300010 D504 B2H 1 3303060300010 D504 B1H 1 RoHS RoHS Chip ferrite bead 0805 Chip ferrite bead 0805 26 3221507600000 L601 T3B 1 3221507600000 1601
9. P46 SEG30 PLL ENABLE Vssd Ground power supply for digital circuit SW PO Rx Tx control H Rx L Tx switch to VCO 92 SW P1 TX CTRL O Control power supply for Tx transmit at high level 93 RESET RESET Reset input 94 Vssa GND 5 Ground power supply for analog circuit 95 Vdda VCC 3 0V 5 Power supply for analog circuit 96 BG REF O To output reference voltage MIC_IN MIC_IN Microphone input 9 DEMODE DEMODE To input baseband signal audio and CTCSS CDCSS MODOUT MODOUT To output baseband signal audio and CTCSS CDCSS 100 None 16 HVT TC 320 Service Manual C 320 Parts List 1 PartNo Qy Ref No Print No Chip resistor 0402 02 J 1 16W RoHS 6 3001050000000 Chip resistor 0402 00 J1 16W RoHS 1 R527 B2H 8 3001051000020 Chip resistor 0402 100 1 16W RoHS 1 R119 913001051000020 Chip resistor 0402 100 1 16 RoHS 1 2311 Chip resistor 0402 1000 F 1 16W RoHS Chip resistor 0402 10K J 1 16W RoHS HVT TC 320 Service Manual 60 3001052730010 Chip resistor 0402 27 F 1 16W RoHS 1 R408 66 3001053320000 Chip resistor 0402 3 3KO J 1 16W RoHS 1 2307 68 3001053320000 Chip resistor 0402 3 3KO J 1 16W RoHS 1 R402 B2E 6913001053330000 Chip resistor 0402 F 1 16W RoHS 1 R125 80 3001054710000 Chip resist
10. is the registered trademark of Shenzhen HYT Science amp Technology Co Ltd 2009 HYT Co Ltd All Rights Reserved Free hotline 400 830 7020 www hyt com cn T04574 03207 8130032000000 2009 4 3 SERVICE MANUAL TWO WAY RADIO TC 320 HVT TC 320 Service Manual Contents Introduction ee ee 3 Safety INfOFMANOM 3 tou A 4 Software Specifications 6 Circuit 9 m 13 16 320 Parts List uuu uuu uuu Eo eR o ERE EFC CURE ECCE 17 320 400 420MHZ Parts Change Recorird 26 TC 320 450 470MHZ Parts Change Record 39 Adjustment Description U U u U 43 Troubleshooting Flow Chart U J J 52 Disassembly and Assembly for Repair U J 55 Exploded 59 6 320 Parte 2 uuu uuu
11. 1 Wide Narrow Bandwidth Switch and Frequency Switch in an Adjustment ltem In an adjustment item short press SK to switch between wide and narrow bandwidth The default adjustment point is the 1st frequency low frequency of current bandwidth After selecting a bandwidth short press no longer than 1s PTT to switch among different frequencies 2 Adjustment Items Include Tx Items Tx Frequency Tolerance and VCO Lock Voltage Note These items are adjusted outside the adjustment mode via hardware Tx Low Power Tx High Power CDCSS Wave CDCSS Deviation CTCSS Deviation low CTCSS Deviation medium CTCSS Deviation high Tx Low Voltage Threshold and Max Deviation Note These items are adjusted inside the adjustment mode via software Rx Items VCO Lock Voltage outside the mode Squelch and Rx Low Voltage Threshold 3 Specific Operations and Requirements 1 Conventional Adjustment Items outside the adjustment mode Tx Frequency Tolerance VCO Lock Voltage Note The configuration file has preset CH1 CH2 and CH3 as wide bandwidth with low medium and high frequency respectively and CH4 CH5 and CH6 as narrow bandwidth with low medium and high frequency respectively Make sure the antenna or load is connected before adjustment 45 TC 320 Service Manual UE Rotate the Channel Selector Adjust VR101 with ceramic tuning tool to x Frequenc Tol 4 Knob to and press to
12. 4 0286 2141 21 22 T 43 9 TC 320 VG PCB View Bottom Layer 5 gt Goong m i L is yen forse eo pros eer 5 o BNE Ji n 66 13mVrms 300mVrms 66mvrms 3dBm 7dBm 17dBm 26dBm 34dBm 12038 124 iBm 1i2dBm 41151Bm 1i0iBm 119dBm 1101Bm 74dBm TldBm 340mVrms 186mVrms 1 8Vrms 67 ES TC 320 Block Diagram 68 2 0603 0604 CHARG B302 J202 CHARG D601 R LED p 0604 Speaker J 0301 ECO 0602 894606 LED 2 PRE AMP RF AMP RF AMP LPF W402 EC2 ANTENNA EC3 SW601 CLD_OUTP gt 2 ON OFF 1 1 PTT 3 2201 R419 j
13. AN 100p 100p 100p 100p 82 L108 926902 4 lt i R502 C543 601s 22002 E 45 24 6529 1303 i T i Bip al e 4 WON o3 8 1 R101 L107 L110 10 pos iun gt gt BUSY AAA C308 R304 1 8 XT101 1 C103 C104 2 Cong R508 ELS 1 0 22u C120 123 TL 2125MHz 10p 40p E 1 NC 1000p 0 1u R303 C309 F 1 C307 3 3k 8 270k 220p 27 470p 14 R125 VR101 68k 4 2 R307 R102 C126 R312 C315 3 3k 47k 1000 22k 0 1u cum R103 41107 47k A QT_OUT gt gt VW 1 R313 C310 4700P 47k 74 TC 320 Service Manual Specifications General Specifications Frequency Range 400 420MHz 450 470MHz Channel Capacity 16 Channel Spacing 25 KHz 12 5KHz Operating Voltage 3 8V DC Battery 1100mAh Li lon battery Battery Life 5 5 90 duty cycle About 8 hours Operating Temperature 20 C 55 Dimensions HxWxD with battery without antenna en Weight with antenna amp battery 135g Frequency Stability 2 5ppm Receiver Sensitivity lt 0 25 0 281 Selectivity 60 554 Intermodulation 55dB Spurious Response Rejection 60dB Rated Audio Powe
14. HVT TC 320 Service Manual Chip capacitor 0402 1000PF K 50V RoHS 34 HVT TC 320 Service Manual Chip capacitor 0402 0 1UF K 16V RoHS 35 HVT TC 320 Service Manual 336 3102992000040 Adjustable capacitor 3 2 2 5 1 25mm RoHS Chip ferrite bead 0603 6000 25 ROHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0805 600 25 RoHS Chip ferrite bead 0805 600 25 ROHS 36 HVT TC 320 Service Manual 377 3231301250000 inductor E2 0 30 1 2 5TL RoHS 380 3231351630000 Air core inductor E2 0 35 1 6 3TR RoHS 381 3231351640000 Air core inductor E2 0 35 1 6 4TL RoHS 382 3231351640000 Air core inductor E2 0 35 1 6 4TL ROHS 383 3231351640000 Air core inductor E2 0 35 1 6 4TL RoHS 384 3231351650000 Air core inductor E2 0 35 1 6 5TL RoHS Transistor DTC114EE TL RoHS Transistor 289C5108 Y TE85L RoHS Transistor 28C5108 Y TE85L RoHS 37 HVT TC 320 Service Manual RF PCB RoHS RoHS 442 6201648000000 shielding mask 0 30 RoHS tT 443 6201651000000 Filter shielding mask 0 20 00 RoHS 11 J 444 7000183000000 Heat sinking device 5 00 RoHS 1 24 38 HYT C 320 450 470MHZ Parts Change Record TC 320 Service Manual TC 320 450 470MHz Parts Change Record B
15. 3001050000000 Chip resistor 0402 00 J 1 16 RoHS 1 2223 136 6 3001050000000 Chip resistor 040202 J 1 16 RoHS 1 R527 B2H 8 3001051000020 Chip resistor 0402 102 1 16 RoHS 1 R119 2 3001051000020 Chip resistor 0402 100 1 16 RoHS 1 R311 30 HVT TC 320 Service Manual 60 3001052720010 Chip resistor 0402 2 7 1 16W RoHS 1 R502 66 3001053320000 Chip resistor 0402 3 3KO J 1 16W RoHS 1 R305 68 3001053320000 Chip resistor 0402 3 3KO J 1 46W RoHS 1 R401 B2F 69 3001053320000 Chip resistor 0402 3 3KO J 1 16 5 1 R402 Chip resistor 0402 470 J 1 16W RoHS 80 3001054700000 Chip resistor 0402 470 J 1 16W RoHS R619 T3G 86 3001054720000 Chip resistor 0402 4 7 J 1 16W RoHS 1 R608 89 3001054730000 Chip resistor 0402 47KQ J 1 16W RoHS 1 R103 840 90 3001054730000 Chip resistor 0402 47 J 1 16W RoHS R607 T3G 96 3001054730000 Chip resistor 0402 47KO J 1 46W RoHS 1 R610 98 3001054730000 Chip resistor 0402 47KO J 1 46W RoHS 1 R612 99 3001054730000 Chip resistor 0402 47 J 1 46W RoHS 1 R616 T4G 31 HVT TC 320 Service Manual 136 3002991030150 Adjustable resistor 2 7 2 0 0 9 10 30 RoHS 32 HVT TC 320 Service Manual Chip capacitor 0402 39PF J 50V RoHS Chip capacitor 0402 100PF J 50V RoHS 33
16. A TOT pre alert tone sounds before TOT timer expires Receiving LED glows green when carrier is present Green LED flashes once every 1 second while scanning is in process Scan Scan Start Alert programmable by the dealer a beep is heard Scan End Alert programmable by the dealer a beep is heard Writing Reading Data Red LED glows when reading data HVT TC 320 Service Manual Green LED glows when writing data A low pitched tone is heard when the radio is switched to low power Adjust Power Level A high pitched tone is heard when the radio is switched to high power vox One beep is heard when the VOX feature is activated Two beeps are heard when the VOX feature is disabled Channel Selector Knob Rotate the knob to select your desired channel Power On Off Key Long press the Power On Off Key until an alert tone is heard to turn the radio on off Volume Control Keys Battery Latch Used to secure or remove the battery Audio Accessory Jack Used to connect audio accessories such as earpiece and microphone Mini USB Jack To connect accessories such as programming cable cloning cable and switching power Software Specifications Description of Features Channel Capacity 16 Channel Spacing 25KHz 12 5KHz Channel Scan Rx Tx status indication red green LED CTCSS CDCSS Encode amp Decode 38 groups of CTCSS 83 groups of CDCSS and
17. Communication Test Set Antenna VR101 control the center frequency within the lt 150Hz olerance transmit error range Rotate the Channel Selector Adjust TC101 with ceramic tuning tool Knob to CH3 and press PTT to until the lock voltage meets the 1 9V 2 3V VCO Tx transmit requirements TC101 Lock Voltage Rotate the Channel Selector Knob to and press PTT to Check 20 5V Digital Voltmeter CV transmit Rotate the Channel Selector 9V 2 VCO Rx Knob to CH3 TC101 Lock Voltage Rotate the Channel Selector Check 20 5V Knob to CH1 46 TC 320 Service Manual 2 Adjustment in the Adjustment Mode Note Make sure the antenna or load is connected before adjustment rotate the Channel Selector knob to save the adjusted values automatically Rotate the Channel Selector Knob to Press or key to CH2 and select low frequency adjust the output 1 8 2 2W High Power Short press PTT key to switch power and rotate the Dacia between different frequencies low Channel medium and high Communication Test Set Antenna Selector Knob to save it x Power Rotate the Channel Selector Knob to Ammeter Connector Press or key to CH1 and select low frequency adjust the output 0 5W 0 2W Low Power Short press PTT key to switch power and rotate the between different frequencies low Channel Selector medium and high Knob to
18. Manual ircuit Description 1 General Diagram Tx Section Audio signal from MIC is sent to the RF chip U501 directly In U501 the signal is amplitude limited and amplified and then sent to the MCU chip U601 The baseband signal processing circuit in U601 will convert the amplified audio signal to digital signal via A D conversion and then convert the digital signal to modulation signal via D A conversion after processing such as filtering signal compression encryption pre emphasis Tx gain control and amplitude limiting are completed The modulation signal from MCU will pass through the low pass filter circuit and then will go to VCO for direct frequency modulation The modulated carrier signal is converted to RF signal by the buffer amplifier U501 and then enters front stage power amplifier Q401 for amplification The amplified RF signal will be further amplified by the pre driver Q402 and final stage power amplifier Q403 and then will enter low pass filter circuit through the switching diode D401 and will be finally transmitted via antenna after ultroharmonics are removed D402 and D501 compose the Rx Tx switch circuit Rx section Desired and undesired RF signals received via the antenna are fed to the bandpass filter composed of SAWF501 SAWF502 to filter out undesired out of band interference signal and then amplified by the RF amplifier 0506 The amplified signal is then fed to the bandpass fil
19. Rotate the Channel Selector Knob to CH10 and SQL level 5 ON is set Press or key to sample current value At this time wide bandwidth and low frequency are selected Short press PTT key to switch the frequency Short press SK to enter narrow band Press key to adjust squelch level Short press PTT key to switch the frequency Rotate the Channel Selector knob to CH11 and SQL level 5 OFF is set Press or key to sample current value At this time wide bandwidth and low frequency are selected Short press PTT to switch the frequency Communication Test Set SSG 119dBm MOD 1KHz DEV 3KHz Filter 0 3 3KHz Communication Test Set SSG 118dBm MOD 1KHz DEV 1 5KHz Filter 0 3 3KHz Communication Test Set SSG 121dBm MOD 1KHz DEV 3KHz Filter 0 3 3KHz Antenna Earpiece Socket Antenna Earpiece Socket TC 320 Service Manual Adjust the output signals of SSG to the squelch level Rotate the Channel Selector Knob to save the value after three point adjustment Same as above Adjust the output signals of SSG to the squelch level Rotate the Channel Selector Knob to save the value after three point adjustment Squelch level Level 5 121dB Squelch level Level 5 120dB Squelch level Level 5 122dB 50 HYT TC 320 Service Manual RX Low Voltage Threshold Sensitivity Short press SK to enter narrow band press or Narrow key to s
20. Screw M2 0 6 0mm 1 3 6000718100000 Encoder knob RoHS 1 4 7206007400000 Fixing nut of Encoder switch ROHS 1 5 6100335000000 O RING for antenna RoHS 1 6 6000737000010 Light guide charge LED RoHS 1 7 6000736000000 Light guide signal indicator ROHS 1 8 6100363000000 POWER key RoHS 1 9 6201644000000 Felt speaker steel ROHS 1 10 7400229000000 Felt speaker cloth RoHS 1 11 7500250000000 Speaker washer RoHS 1 12 4210038000000 Cable RoHS 2 13 6000739000000 Accessory Jack Cover RoHS 1 14 6201643000000 Battery discharging piece RoHS 2 15 6000734000010 Radio Chassis RoHS 1 16 Li ion battery pack RoHS 1 17 7500249000000 Sponge pad for rear cover RoHS 2 18 6201796000000 Belt clip dome RoHS 1 19 7000205000000 Spring of Belt clip ROHS 1 20 7000206000000 Bolt of belt clip RoHS 1 21 7000181000000 Fender washer RoHS 1 22 6000836000010 Belt clip ROHS 1 23 7102505000200 Machine screw M2 5 4 80mm RoHS 2 24 6000733000000 Rear cover RoHS 1 25 7000179000000 Spring of battery latch RoHS 1 26 6000738000000 Battery Latch RoHS 1 27 7102008020100 Self tapping screw PT2 0 8 0mm RoHS 4 28 7600036000000 Shield of main unit RoHS 1 29 7400233000000 PCB shield RoHS 1 30 7400034000000 Speaker insulation pad RoHS 1 31 5001000000090 Speaker RoHS 1 32 7101904020200 Self tapping screw Version 2 0 ST1 9 4 0mm RoHS 1 33 6201671000000 Charging piece RoHS 2 34 7209802800000 Supporting ring of encoder switch RoHS 1 3
21. cloning begins frequency band and Model ID will be checked LED glows orange for 2 seconds and then goes out to indicate a failed check If the check is successfully carried out but error occurs Status of the source radio After during cloning LED will keep flashing orange until you target radio is turned on and Wired Clone press any key other than the Power On Off Key to cloning cable is connected press cancel it PTT of source radio to begin Factory Clone If error occurs during cloning LED will keep flashing orange until you press any key other than the Power On Off Key to cancel it Once cloning is completed green LED solidly glows Red LED will flash if battery runs low when the radio is in Clone Mode while the radio will make no response if battery runs low during cloning process LED solidly glows green when cloning is in progress Status of the target radio Green LED goes out when cloning is completed When the radio is turned on an alert tone sounds and orange 1 oun TNR ud LED flashes once ower On to enter User Mode When the radio is currently on a blank channel it sounds beep tone continuously Power Off When the radio is turned off the power off alert tone is heard LED flashes red and a low pitched tone sounds at intervals of Low Battery Alert 10 seconds Red LED solidly glows When TOT timer expires the radio sounds beep tone Transmitting continuously
22. frequency band high level high frequency band low level low frequency band P75 VREF VCC 3 0V Input of reference voltage of ADC and DAC i P74 DACO QT_OUT BENE E CTCSS CDCSS output P73 AD3 Reserve Reserved Vssa Ground power supply for analog circuit EN VCC 3 0V Ground power supply for analog circuit P71 AD1 Detect noise a pres XTALO OSCO For 32 678KHz main crystal oscillator XTAL1 OSC1 m PLL CAP PLL CAP For PLL external capacitor 10nF 14 HVT TC 320 Service Manual None Reserve Reserved P01 COM1 Reserve Reserved P00 COMO Reserve Reserved Pues 9 mm P14 SEG4 Reserved Ca ress rene eres P17 SEG7 Reserve Reserved P20 SEG8 To detect input from encoder switch P23 SEG11 P25SEG13 Reserve Reserved P26 SEG14 Reserve Reserved P31 SEG17 Reserve Reserved None None None P32 SEG18 Reserve Reserved P35 SEG21 Reserve Reserved 15 HVT TC 320 Service Manual P37 SEG23 Reserve Reserved P40 SEG24 Reserve Reserved P42 SEG26 EEPROM DATA external pull up resistor connected 85 P43 SEG27 LD To detect PLL circuit unlock lock L unlock external pull up resistor connected P44 SEG28 DATA PLL DATA r s
23. low level Rx VCO is valid In case LD of 0501 is at low level unlock status is valid When this status is detected by the microprocessor transmit receive operations are prohibited 2 1 2 Block Diagram of RF Power Amplifier 10 HVT TC 320 Service Manual PRE AMP AMP RF AMP LPF W402 ANTENNA TX OUT R419 420 VT IR421 V_BAT Sw Sw APC 0401 0404 The modulated carrier signal output from VCO is pre amplified by 0501 and then goes to the front stage amplifier Q401 driver stage amplifier Q402 and final stage amplifier Q403 respectively Afterwards the amplified RF signal enters the low pass filter LPF circuit through diode D401 and then is transmitted via the antenna after ultroharmonics are removed D402 and D501 compose the Rx Tx switch circuit APC circuit is composed of Q404 Q405 and U401 U401 controls the bias voltage at the gates of Q402 and Q403 to control Tx current and to further regulate power 2 1 3 Block Diagram of Rx Circuit LPF wi402 _ ANTENNA MIX SWAFS RX LO 1 505 xF504 SWAF N D502 1501 5 D503 CF501 SWAF SW E E n H Ea il VR R305 4 gt c306 0501 Vv AF BUSY Desired and undesired RF signals received via the ante
24. 01 52 Receive Circuit No signal received The Rx circuit is normally supplied Yes Check the Rx power supply circuit The Rx frequency is LED works normally Yes he Rx signaling is 56 correctly Yes The speaker works normally Yes he audio amplifier works normally Yes he Volume Control knob works normally Yes P98 and P27 of MCU U60 normally outputs signals Yes he modulation parts work normally Yes circuit work normally Yes RF mixer circuit work normally Yes Check U501 its circuit and Q506 Change the Rx signaling Replace the speaker Check circuit of the audio amplifier Replace the Volume Control knob Check and replace MCU Check and replace CD501 and CF501 Check U501 Q504 and Q505 Check the output status of the local oscillator VCO Q505 U501P38 input output Check the antenna set correctly he Rx SQL level is set correctly Replace the Rx LED D601 competed TC 320 Service Manual Change the Rx frequency Change the Rx SQL level HYT MCU Yes X601 of MCU works Other pins contro Start Normal
25. 0501 RX LO NC NC GND1 STB LAA CLK 2nd MIX OUT 36 ds 21 JTB32304 AS VOCI as 3 DATA 2nd MIX IN LD PLL VCC IF DEC CF501 Win BAT ALM N 31 C528 LFYM450F 6 0K V_SAVE 47k 612450425 S Cit 30 250 ee 100 XB QUAD 100p 100p Bs HH R502 ES C529 2 2 601s 92201245 25 2 gt 27k T 82 E 550559990000 T cpsot mQxxxaaoonmraeamc zz OG ddNdddiddddd C308 R101 L107 cios 1110 TS HTSESRSSSNS 470p ak C306 R305 10 6015 1uH V SAVE L109 1000p 6015 519 21 1 Lo R303 C309 mo 03807 0 22u 8 E 101 C103 C104 270k 470p 470p NC C120 C123 21 25 2 10 10 C118 1000 0 1 ae L dl e R125 VR101 33k 10 lt 2 R307 R312 C315 3 3k R102 C126 22k 1u 68k 1000 0132 R103 1u 6 3V 47k R313 4700F QT_OUT VW 47k 71 TC 320U 1 VG Schematic Diagram PLL
26. 0k 470p ANA AA 4 10k 105 TD R124 150 198 150 1 N A 142 100 gt 68k R406 C438 470p 15k gt 0405 C106 L104 R117 104 114 Q502 15 27nH 4 7k 5 51 VR DTA114YE IVY 4 Q102 4 PRF957 3 HVC350B C148 1102 7 23508 wy cio 109 R106 c Sp c144 508 3 3uH 10 0 5 2501 i taos P C130 Tid oor 470P 114 8513 C105 T 1 T 288 C149 T 100nH 100nH 0102 X 2R R115 T qu C510 1000 101 D103 HVC350B E 179 270 NU SAWFSO1 0 01u 0504 HDF428A 0502 Em 4 4 A HVC131 HVC131 300 2 4 WV 4 4 C504 L504 Bia C512 R114 C134 470p 15nH 4 7nH 470p D105 1 R116 11101 PA 6015 HVC131 D505 7 SAWF502 D503 1 HVC131 HDF439A HVC131 ng D508 Q103 TP100 T 114 C511 bi 2 R511 C135 2133 tu 510 509 k 1000p 100 100nH Y M 1 107 10k R111 R109 nrc 47 4k C514 S AAR S AAA R110 2 2k 116 C114 0 056u 0 056u C115 1 16 gt gt RF IN lt TX OUT gt lt lt 69 TC 320 Schematic Diagram CPU
27. 1 600 25 100MHz ROHS 600 25 100MHz RoHS 40 HYT TC 320 Service Manual 27 4100320300060 220 main PCB 1100320300060 PCB board 320 4L 1 2T 4L 4P RoHS RoHS 28 41003001001A0 TC 310 320 PCB RoHS 1 100320100180 320 RF PCB RoHS U501 T2B 1 29 3101054710010 CMP capacitor 0402 470PFK 1 None None C543 0 50 5 8401002000790 ansistor 0506 B2G 1 None None 0506 B2G 2SC5065 O TE85L F RoHS 31 3210305180000 Multilayer chip inductor 0402 4 None L506 B2H 0 18nH LQG15HS18NJ02 RoHS 32 3001051020000 resister 0402 1 F R504 B2H 1 None None R504 B2H 0 1 16W RoHS Chip capacitor 33 8101051040060 GRM155R71C104KA88D C518 B2H 1 None None C518 B2H O 0 1UF K 16V RoHS Chip resister 0402 5600 J 34 3001055610000 503 128 1 None None R503 T2G 0 1 46W RoHS Chip capacitor 35 8101051020010 GRM36X7R102K50PT 1000 C521 T2G 1 None None C524 0 K 50V RoHS Chip resister 1206 00 J 36 3001080000000 C314 1 None None C314 0 1 4W RoHS Charging IC CN3062 SOP8 Charge management IC 37 3615999000000 U604 1 3615042000010 U604 1 Li ion RoHS MC34673AEP RoHS Multi layer chip inductor 4 7nH Multi layer chip inductor 15nH 38 3210305479000 L504 B2H 1
28. 1 8101051020010 Chip capacitor 0402 1000PF K C517 1 3101052700000 Chip capacitor GRM1555C1H270J C517 1 50V RoHS 27 J 50V RoHS 2 None None 1503 B2H 13210305330000 layer chip inductor 33nH 1503 B2H 1 LQG15HS33NJ02 RoHS N N R528 B2G 3001051230000 reSister 0402 12 J R528 B2G 1 QU 4 46W RoHS 4 N N 8529 B2G 3001056820000 resister 0402 6 8 J R529 1 Aes 1 16W RoHS 5 N N c523 3101051010030 CMP resister 0402 100PF J C523 B2H 1 50V RoHS 1 1 Chip resister 0402 4 7 J 6 3001051000020 Chip resister 0402 100 1 16W RoHS R525 B2G 1 3001054720000 R525 B2G 1 4 46W RoHS Chip capacitor 0402 180PF J 7 8101051500020 Chip capacitor 0402 15 J SOV ROHS C507 B3G 1 3101051810000 C507 B3G 1 Multi layer chip inductor 15nH Multi layer chip inductor 100nH 8 3210305150010 1505 B3H 1 3210305101000 L505 B3H 1 LQG15HS15NJO2 RoHS LQG15HSR10J02 RoHS 9 None None 0503 B2H 3418001000010 Transistor AT 41511 TR1G RoHS 0503 B2H 1 10 3001053330000 resister 0402 33 F R527 B2H 1 3001050000000 resister 0402 00 J 1 16W R527 B2H 1 4 16W RoHS RoHS 11 None None C530 3101051000020 Chip capacitor 0402 10PF J C530 T2H 1 50V RoHS 12 None None L516 3210305220000 Multiayer chip inductor 22nH L516 T2H 1 L
29. 2 AT24C16 9602 R635 TWO V SAVE 25 1745 VR t 3 4 1607 R631 601s 618 C617 Pp 4Tk C621 C620 22u 1000p 1000p C619 TC 320U 1 VF Schematic Diagram PLL VR 517 1000p R526 220 C507 C525 R516 15p 470p 10 3505065 RF IN 2 SAWF503 1 L510 HDF460A 1514 545 0 0 FRU M icd 1 4 m C539 1509 C538 0540 1000 L512 L507 R517 2 2uH 22p 0 01u NC NC 5 C547 C524 1u 470p 2 3 R210 0505 10k 3 C534 L511 C544 25 4226 C546 15nH 15 Pe id 1 1000p rd 4 2 213 211 212 C211 428212 502 0 22u 5 6k 0 022u 10p 470k R519 MIX R503 MIC IN lt lt 4 1 27022521 nH z cm R220 C210 C542 R518 12k 4 7410 2 1 R507 C520 R 22k EE Ler 205 C526 25252080850578 3p 59299882808657 92985 jFEEXL E XF501 R506 9 1 11 21 7MHz 270 R501 Q504 SPL OUT RF VCC 680k 2565108 21 SW RF OUT 1 T 1 3 VCO IN 40 4 C531 532 RN101 5 VDET RSSI REF dk PLL GND
30. 3210305150010 L504 B2H 1 LQG15HS4N7S02 RoHS LQG15HS15NJO2 RoHS Chip capacitor 0402 3 6PF B Chip capacitor 0402 4 B 39 3101053690000 C421 B3B 1 3101050400010 C421 BB 1 50V RoHS 50V RoHS Chip capacitor 0603 16PF J Chip capacitor 0603 13PF J 40 3101061600000 419 B2B 1 3101061300000 419 B2B 1 50 RoHS 50 5 41 TC 320 Service Manual 41 3001051000020 resister 0402 100 F R526 B3G 1 8001058200000 resister 0402 820 F R526 B3G 1 1 16W RoHS 1 16W RoHS Tantalum capacitor 0805 1UF M Tantalum capacitor 4 7UF M 42 3104071050070 C132 B4G 1 3104074750070 C132 B4G 1 16V RoHS 10V P RoHS Multi layer chip inductor 0402 Multi layer chip inductor 0402 43 3210305150010 L508 B3H 1 3210305120000 L508 B3H 15nH LQG15 RoHS 12nH LQG15HS RoHS 42 TC 320 Service Manual Adjustment Description Parts Overview pue E 795 e s I 0 gt ta 5 Microphone 13 Accessory Jack Cover HVT TC 320 Service Manu
31. 416531 dk 5 PLL GND 9501 RX LO NC NC GND1 STB 1 4 CLK JTB32304 AS 2nd MIX OUT 36 2 1 1 a TTE 257 0506 026 88 re 31 Ls DATA 2nd MIXIN 33 LD PLL VCC IF DEC PENES CF501 bd BAT ALM N 31 528 LF YM450F 6 0K V_SAVE 47k 612450425 S Cit 30 UR ibid 100p 100p 100p QUAD 120 1 i Wy Q 5 5 5 5 i e520 2525 L 601s lt 907 8 i 5 450 24 gt 27k 82 T 501 lt 2 OG ddNdddiddddd C308 R101 L107 L110 SOCSSRSRSAQE 470 304 C308 Busy C102 10 6015 1000 V_SAVE 1108 C519 5 21 1 L 4 R303 C309 P C307 0 22 R508 8 E 101 C103 C104 270k 470p 470p NC C120 C123 21 25MHz 10p 10 C118 1000p 0 1u zi d Es z R125 VR101 33k 10k lt 4 2 R307 R312 C315 3 3k R102 C126 22k du 68k 1000 cum R103 1u 6 3V 47k R313 4700F QT_OUT VW 47k 73 TC 320U 2 VG Schematic Diagram PLL
32. 5 4304030000030 Gray code band switch RoHS 1 36 6201653000020 Antenna bracket RoHS 1 37 7101704020100 Self tapping screw ST1 7 4 0mm RoHS 2 38 4301040000060 PTT switch RoHS 2 39 7600037000000 Conductive sponge RoHS 1 40 7600020000000 3M Embossed copper foil ROHS 1 41 Main PCB RoHS 1 60 HVT TC 320 Service Manual 42 5002230000010 MIC RoHS 1 43 6100111000010 Silica rubber mic bushing RoHS 1 44 7400077000000 Mic net RoHS 1 45 6000732001000 Front case RoHS 1 46 6300062001010 Decorative sheet zink alloy ROHS 1 47 6100365000000 PTT key silica rubber ROHS 1 48 6000735000010 PPT key RoHS 1 49 Antenna RoHS 1 Note Parts that are not marked with material number may vary with radio frequency band 61 HVT TC 320 Service Manual Packing Diagram Clip Main Unit Gift Box 62 TC 320 VF PCB View Top Layer 63 v9 v 8 9 3 3 3 Hh 9 oooos OOOO TN EE RE E Kam E E t EJ OE HES y a 4 1 gt EXE DT woyog MITA Od HA 0 lt 21 x JE 23 i55 L T 257 da s Cad E TEE z 1 072 lt 59 N LT MITA
33. 507600000 L601 T3B 3221507600000 601 600 25 100MHz RoHS 600 25 100MHz RoHS 27 HYT TC 320 Service Manual TC 320 main PCB FRA 1 2T 4L 4P F 27 41003203000F0 RoHS 4100320300060 board FR4 4L 4P RoHS 28 41003001001 0 310 320 RF PCB RoHS 41003201001 0 320 RF PCB RoHS 29 9301054710040 C543 C543 50V ROHS 30 3401002000790 Transistor 2SC5065 O TE85L F RoHS Q506 B2G None None Q506 B2G Multi layer chip inductor 18nH 31 3210305180000 L506 B2H None None L506 B2H LQG15HS18NJ02 RoHS 32 3001051020000 Chip resister 0402 1 1 16W RoHS R504 B2H None None R504 B2H Chip capacitor 33 3101051040060 GRM155R71C104KA88D 0 1UF C518 B2H None None C518 B2H 16V RoHS 34 3001055610000 Chip resister 0402 5600 J 1 16W RoHS R503 T2G None None R503 T2G 35 3101051020010 capacitor GRMSEX7RIOZKSOPT None None C521 T2G 1000PF K 50V RoHS 36 3001080000000 Chip resister 1206 00 J 1 4W RoHS C314 T4A None None C314 T4A Charging IC CN3062 SOP8 Li ion Charge management IC 37 3615999000000 U604 T4D 3615042000010 U604 T4D RoHS MC34673AEP R2 8 UDFN RoHS Chip capacitor 0603 0 027UF K Chip capacitor 0603 0 056uF K 38 3101062730000 C114 B4F 3101065630000 C114 4 25V RoHS 50V RoHS Chip capacitor 0603 0 018UF K Chip
34. CTCSS Tail Revert of 180 degrees oO ff ON Low Battery Alert Battery Save Unlock Detection and Emergency Alarm 9 Two Selectable Squelch Levels 10 Monitor 11 Time out Timer 12 Squelch Tail Elimination 13 PC Programming manual automatic adjustment 14 High Low Power Switch 2 0 0 5W 15 Wide amp Narrow Bandwidth Compatible 16 Busy Channel Lockout transmission prohibited in busy status 17 Wired Clone 18 Battery Strength Indicator 19 Manual Adjustment 20 VOX and Three Selectable Sensitivity Levels HVT TC 320 Service Manual Description of Modes User Mode It is a conventional communication mode After the radio is turned on it enters the User Mode PC Programming Mode The radio will enter PC Programming Mode through communication with PC programming software In this mode radio functions and adjustment parameters can be set through programming software including User Version and Factory Version The operation procedures are as follows 1 Install PC programming software and its driver dedicated for TC 320 before your initial use 2 Connect the USB port of PC with the Mini USB jack of the radio using a programming cable 3 on the radio 4 Launch the programming software to perform reading or writing operation Note 1 When reading writing data is in progress red green LED glows when reading writing data is completed LED goes out 2 During the operation if
35. Keep antenna at least 2 5 centimeters one inch away from your body when transmitting If you wear a portable radio on your body ensure that the antenna is at least 2 5 centimeters one inch away from your body when transmitting TC 320 Service Manual re j 4 187 Ju ee 5 Microphone 6 Nameplate 7 Charging Terminal 8 Antenna 13 Accessory Jack Cover 14 Audio Accessory Jack 15 Mini USB Jack 16 Strap Hole PTT Push to Talk Key Press and hold down the PTT key to transmit and release it to receive SK Side Key Side Key can be programmed with long short press functions by your dealer 4 HVT TC 320 Service Manual Note Short Press means key press no longer than 1 second and Long Press means key press longer than 1 second Channel Status Indicator Status indications and alert tones are shown in the table below Operations Functions LED Indications and Alert Tones Hold down both SK and Power On Off Key and then the To enter Wired Clone mode source radio is turned on with red LED flashing once Turn on the target radio directly Red LED glows during cloning process Error occurs during cloning a User Clone Once
36. QG15HS22NJ02 RoHS 26 HYT TC 320 Service Manual Chip capacitor 0402 470PF K 13 3101054710010 C525 T2H None None C525 T2H 50V RoHS Chip capacitor 0402 1PF B 50V 14 None None C527 T2H 3101050100010 C527 T2H Hi Q RoHS Chip capacitor 0402 0 1UF K 15 None None C536 B2G 3101051040060 C536 B2G 16 RoHS Chip resister 0402 820 F 16 3001052210000 Chip resister 0402 2200 J 1 16W RoHS R526 3001058200000 R526 B3G 4 16W RoHS Chip resister 0402 100 F 1 16W 17 R530 B2G 3001051000020 R530 B2G RoHS Chip resister 0603 4700 J 18 None R634 BSA 3001064710000 R634 1 0W RoHS Chip resister 0603 4700 J 19 None None R609 B5A 3001064710000 R609 B5A 1 0W RoHS Chip capacitor 0402 1000PF K 20 None None C651 T4D 3101051020010 C651 T4D 50V RoHS Chip capacitor 0402 0 1UF K 21 None None C220 3101051040060 C220 T3D 16W RoHS 22 None None L607 T4B 3221507600000 ChIP ferrite bead 0805 1607 600 25 100MHz RoHS 23 None None 606 3001058220000 resister 0402 8 260 J R606 T4C 4 16W RoHS 24 3101052000020 Chip capacitor 0402 20PF J 50V RoHS C512 BIE 3101051010030 ee C512 B2B 50V RoHS 25 3303060300010 Switching diode HVC131TRF E 5 0504 3303060300010 2 MIRRE 0504 B1H Chip ferrite bead 0805 Chip ferrite bead 0805 26 3221
37. Service Manual Introduction Manual Scope This manual is intended for use by experienced technicians familiar with similar types of communication equipment It contains all service information required for the equipment and is current as of the publication date Safety Information O O O This radio shall be serviced by qualified technicians only Only use HYT supplied or approved batteries and chargers To avoid electromagnetic interference and or compatibility conflicts turn off your radio in any area where posted notices instruct you to do so Turn off your radio before boarding an aircraft Any use of the radio must be in accordance with airline regulations or crew instructions For vehicles with an air bag do not place a radio in the area over an air bag or in the air bag deployment area Turn off your radio prior to entering any area with explosive and flammable materials Do not charge or replace your battery in a location with explosive and flammable materials Turn off your radio before entering a blasting area Do not use any portable radio that has a damaged antenna If a damaged antenna comes into contact with your skin a minor burn may result Do not expose the radio to direct sunlight for a long time nor place it close to a heating source When transmitting with a portable radio hold the radio in a vertical position with the microphone 2 5 to 5 0 centimeters one to two inches away from your lips
38. al Required Test Instruments Radio communication test set 1 set 10V 3A regulated DC power supply 1 set Digital voltmeter 1 set Ammeter 1 set Preparations Place the board to be tested on the test fixture please ensure good connection between each test point and the fixture and connect the board to a power supply with DC voltage of 3 8V Wired Clone 1 Instructions 1 Connect two radios with a cloning cable and power on the source radio while holding down SK on it The radio will enter Wired Clone mode in 2 seconds Then power on the target radio to enter normal mode 2 In Wired Clone mode press SK on the source radio to switch between User Clone mode and Factory Clone mode check Factory Clone mode when programming or you will fail to switch 3 Press PTT key to clone data to the target radio You can clone the data to multiple target radios in the same way 2 LED Indications 1 During the cloning process LED solidly glows red once it finishes LED will solidly glow green 2 Clone errors a User clone Once clone begins frequency band and Model ID will be checked LED glows orange for 2 seconds then goes out to indicate a failed check If the check is successfully carried out but error data clone occurs LED will flash orange In this situation press any key other than the Power On Off Key to turn it off b Factory clone If error data clone occurs LED will flash orange In this situation press an
39. alue will increase in steps of 1 hold down and the adjustment value will keep increasing in steps of 1 The adjustment value will remain unchanged once it reaches the allowed maximum value Short press under certain bandwidth and certain tuning item and the adjustment value will decrease in steps of 1 hold down and the adjustment value will keep decreasing in steps of 1 The adjustment value will remain unchanged once it reaches the allowed minimum value 7 Measures on special items Tx group CH8 is the Tx Low Voltage Threshold This adjustment item is related to AD sampling Press or after entering the above item to activate AD sampling including calculation once Rotate the Channel Selector Knob to save the current AD sampling value If and are not pressed neither the adjustment value will be updated nor will AD sampling be activated Rx group CH10 to CH12 stand for SQL On 5 SQL Off 5 and Rx Low Voltage Threshold respectively These adjustment items are related to AD sampling Press or after entering the above items to activate AD sampling including calculation once Rotate the Channel Selector Knob to save the current AD sampling value If and are not pressed neither the adjustment value will be updated nor will AD sampling be activated 8 Description of key press Short press key press no longer than 1 second Long press key press time longer than 1 second 8 HVT TC 320 Service
40. ample the Bandwidth current value press PTT to switch the frequency Rotate the Channel Selector knob to CH12 High medimum low Wide Bandwidth frequency out of the mode Narrow Bandwidth High medimum low frequency out of the mode Communication test set SSG 120dBm MOD 1KHz DEV 1 5KHz Filter 0 3 3KHz Digital Voltmeter Communication Test Set SSG 121dBm MOD 1KHz DEV 3KHz Filter 0 3 3KHz Antenna Earpiece Socket Communication Test Set SSG 120dBm MOD 1KHz DEV 1 5 Filter 0 3 3 2 Same as above Adjust output voltage o the power supply to 3 7V and press or key to sample the current value Squelch level Level 5 121dB Aler tone will be given with red LED flashing when TX voltage is lt 3 7 119dBm or above 118dBm or above 51 HYT TC 320 Service Manual roubleshooting Flow Chart Transmit Circuit Replace 0602 Check the Tx VCO Y Y Y Y Low Tx No LED fails to power No sound Transmission glow flash Normal Tx Check the Tx ower supply power supply Y Check the voice channel Output ports of MIC 0501 U601 MOD OUT Replace D602 Y Check the Tx channel Y Y Check the Check Q401 Check the antenna Q402 Q403 APC circuit and U5
41. any abnormal situation occurs or no reply is given within a period the reading writing operation will fail and an error message window will pop up Wired Clone Mode 1 Description Wired Clone Mode is an independent mode To access other modes you must restart the radio Wired Clone Mode covers User Clone mode and Factory Clone mode 1 User Clone Mode Connect two radios using a clone cable Hold down both SK and Power On Off Key of the source radio it will be turned on and will enter User Clone Mode after 2 seconds The target radio can be directly turned on to enter the mode In this mode parameter data stored in EEPROM of the source radio will be cloned to EEPROM of the target radio The data transferred only covers channel data and common parameters excluding adjustment data version and serial No of the model 2 Factory Clone Mode Connect two radios using a clone cable Hold down both SK and Power On Off Key of the source radio it will be turned on and will enter User Clone Mode by default after 2 seconds Press SK afterwards to switch to Factory Clone Mode The target radio can be directly turned on to enter the mode The data transferred covers all data in EEPROM other than serial No with flag of manual adjustment switch included 2 Process Process of Wired Clone 1 Red LED flashes once after the source radio enters Wired Clone Mode Press PTT to clone data to the target radio 2 During communication the source radio glows re
42. capacitor 0603 0 056uF K 39 3101061830000 116 5 3101065630000 116 5 25V RoHS 50V RoHS Chip capacitor 0603 12PF J 40 3101061300000 Chip capacitor 0603 13PF J 50V RoHS C419 B2B 3101061200000 C419 B2B 50V RoHS Chip capacitor 41 3101051500020 Chip capacitor 0402 15PF J 50V RoHS C423 B3B 3101051800010 GRM1555C1H180JZ01J 18PF J C423 B3B 50V RoHS 42 3101050600010 Chip capacitor 0402 6 50V RoHS C515 BiE None None C515 28 HYT TC 320 Service Manual Multi layer chip inductor 0402 10nH 43 3001050000000 Chip resister 0402 00 J 1 16W RoHS L514 B3H 3210305100010 L514 B3H LQG15 RoHS Chip capacitor 0402 3PF B 44 3101050600010 Chip capacitor 0402 6PF B 50V RoHS C545 B3H 3101050300000 C545 B3H 50V RoHS 46 3101050590010 capacitor 0402 0 5PF 50V C534 B3H 3101050390000 capacitor 0402 0 50V C534 Hi Q RoHS Hi Q RoHS Tantal itor 1UE M 16V Tantalum capacitor 48 3104071050070 capacitor C132 B4G 3104074750070 TEESVP1A475M8R 4 7UF M 10V C132 B4G TEESVP1C105M8R RoHS ROHS Multi layer chip inductor 4 7nH Multi layer chip inductor 0402 15nH 49 3210305479000 L504 B2H 3210305150010 L504 B2H LQG15HS4N7S02 RoHS LQG15HS15NJ02 RoHS 29 HVT TC 320 Service Manual 1 3001050000000 Chip resistor 040200 J 1716W RoHS R222 136 2
43. d LED and the target radio glows green LED When communication ends the source radio glows green LED and LED of the target radio goes out which indicates both radios are ready for another cloning 3 If any abnormal situation occurs during communication the source radio will flash orange LED and will stop communication for another cloning 4 When the communication ends the source radio goes back to standby status Press PTT again to begin another cloning Manual Adjust Mode Hold down PTT SK and Power On Off Key to turn the radio on and to enter Manual Adjust Mode Note This operation is subject to the option Panel Test Mode in the programming software When this option is unchecked the radio will be unable to enter the adjustment mode It helps avoid change of parameters and degradation of radio performance caused 7 HVT TC 320 Service Manual by user s misoperations Keep this option unchecked after values are well adjusted from factory to avoid any unexpected change of values The adjustment values can be reset and changed in Factory Mode only Description of adjustment 1 To enter Manual Adjust Mode Hold down PTT SK and Power On Off Key until the radio is turned on and orange LED glows the radio will enter Adjust Mode When the keys are released the radio will enter item N of Tx group N depends on the position where the Channel Selector Knob locates Red LED glows for adjustment of Tx group items and green LED glows for a
44. djustment of Rx group items 2 switch between Tx group and Rx group This operation is done through the Channel Selector Knob Red LED solidly glows when adjusting items in Tx group Green LED solidly glows when adjusting items in Rx group 3 To switch between items of Tx group Rx group This operation is done through the Channel Selector Knob Tx group CH1 to CH9 stand for Tx Low Power Tx High Power CDCSS Balance CDCSS Deviation CTCSS Deviation low CTCSS Deviation medium CTCSS Deviation high Tx Low Voltage Threshold and Max Deviation of Tx Audio respectively Red LED solidly glows when adjusting items CH1 to 9 Rx group CH10 to CH12 stand for SQL On 5 SQL Off 5 and Rx Low Voltage Threshold respectively Green LED solidly glows when adjusting items CH10 to CH12 CH13 to CH16 are invalid and no adjustment item 4 switch between wide and narrow bandwidth When adjusting a certain item short press SK orange LED flashes indicating valid press to switch between wide narrow bandwidth After this operation the first frequency of current bandwidth is the frequency for adjustment by default 5 To switch frequency Short press no longer than 1 second PTT green LED flashes indicating valid press to switch frequency one by one under certain bandwidth and certain adjustment item 6 add subtract adjustment value Short press under certain bandwidth and certain tuning item and the adjustment v
45. eceive data to from PC 2 2 2 Signal Processing Section 2 2 2 1 Tx Baseband Processing The audio signal input from MIC enters U601 and is then converted into digital signal by analog to digital conversion Afterwards the signal is divided by the digital low pass filter into 2 flows One flow serves as the signal of VOX detection the other is processed AGC compandor high pass filter encryption and pre emphasis mixed with DTMF signal from MCU converted to baseband signal via digital to analog conversion to output Then the signal is processed by the active low pass filter and sent to the VCO for modulation 2 2 2 2 Rx Baseband Processing After entering U601 the DEMOD signal derived from IF demodulation is converted to digital signal via analog to digital conversion ADC and then is sent to the digital low pass filter The signal is divided into 2 flows One flow is processed by CTCSS CDCSS decoder the other is processed by high pass filter and then is subject to de emphasis decryption signal expansion and DTMF demodulation and etc and finally digital to analog conversion to output audio signal 12 HVT TC 320 Service Manual 2 2 3 Audio Power Amplifier The audio signal output from U601 is amplified by the audio power amplifier U301 to drive the speaker directly 2 3 Power Supply Processing Block diagram of power supply circuit is shown as below G601 Power Supply Section The 3 7V bat
46. efore Change TC 320 VF After Change TC 320 VG ica Print Print No Part No Description Ref No No Qty Part No Description Ref No No Qty 1 101051020010 capacitor 0402 1000 1 3101052200010 ChIP capacitor 0402 22PF J C517 1 50V RoHS 50V RoHS 2 None None 503 3210305330000 Mult layer chip inductor 503 4 LQG15HS33NJ02 RoHS 3 N N R528 B2G 0 3001051230000 Po esl TY R528 B2G 1 4 46W RoHS 4 N N R529 B2G 0 3001056820000 E R529 B2G 1 2 1 16 5 5 N C523 B2H 0 3101051010030 NAVE C523 B2H 1 ae 50V RoHS 6 3001051000020 R525 B2G 1 3001054720000 R525 B2G 1 1 16W RoHS 1 16W RoHS 7 8101051500020 507 B3G 1 3101051810000 C507 B3G 1 50V RoHS 50V RoHS Multi layer chip inductor 15nH Multi layer chip inductor 100nH 8 8210305150010 L505 B3H 1 3210305101000 L505 B3H 1 LQG15HS15NJ02 RoHS LQG15HSR10J02 RoHS Transistor AT 41511 TR1G 9 None None Q503 B2H 0 3418001000010 Q503 B2H 1 RoHS Chip resister 0402 68 J Chip resister 0402 00 J 1 16W 10 8001056830000 R527 B2H 1 3001050000000 R527 B2H 1 1 16W RoHS RoHS Chip capacitor 0402 15PF J 11 None None C530 T2H 0 3101051500020 C530 T2H 1 50V RoHS 39 HYT TC 320 Service Manual 12 None None 1516
47. h channel lt 20Hz 300Hz On CH5 CH6 and 7 short press Use or key to make Narrow SK key to enter narrow bandwidth slight adjustments until the 300 500Hz Bandwidth and short press PTT key to switch CDCSS deviation meets the between different frequencies requirements Bandwidth ensure that the Communication Test Set specifications meet the Rotate the Channel Selector Knob to Antenna Max CH9 BPF lt 20Hz 15kHz requirements Rotate the arpiece deviation Short press SK key to switch to AF 1kHz Channel Selector Knob to Narrow 4 7 Socket narrow band 120mV save the value after 1 7 2 3KHz wide narrow bandwidth adjustment 48 HYT TC 320 Service Manual Wide inati Rotate the Channel Selector Knob Communication Test Set 3 0KHz Modulation Bandwidth BPF lt 20Hz 15kHz Sensitivity Narrow Short press SK key to switch to AF 1kHz 2 Bandwidth narrow band 343mV Adjust output voltage of the Aler tone will be TX Low Power Supply Power power supply to 3 5V and given with red LED Voltage Rotate the Channel Selector Knob to CH8 Digital Voltmeter Port Supply press or key to flashing when TX Threshold sample the current value voltage is 3 5V 49 HYT 3 Rx Circuit Adjustment Wide Bandwidth Squelch On Narrow Bandwidth Squelch Off Wide Bandwidth
48. in a Make sure that the speaker is well connected and the charging piece on the bottom is correctly installed b Install the supporting ring of the Channel Selector Knob c Attach the main PCB d Attach and secure two screws take care to control the torsion force within 0 8 1 2kgf Note don t damage the speaker cable during installation Charging piece 2 Assemble the chassis a Attach the chassis of radio b Attach and secure the four fixing screws take care to control torsion force within 1 2 1 5kgf Assemble the nuts and Channel Selector Knob on the top Attach and secure the nuts on the top of the radio with a waterproof ring Attach the Channel Selector Knob Attach and secure the fixing screws Attach and secure the Channel Selector Knob Cover 57 HVT TC 320 Service Manual 4 Assemble the antenna 5 Attach the battery a Insert the battery b Attach the rear cover 6 Attach the belt clip 58 TC 320 Service Manual 2 gt 2 x 59 HYT C 320 Parts List 2 TC 320 Service Manual No Part No Items Qty PCS 1 6201658001010 Encoder knob cover RoHS 1 2 7102006000000 Machine
49. ip ferrite bead 0805 600 25 RoHS 375 3231301250000 Air core inductor E2 0 30 1 2 5TL ROHS 23 HVT TC 320 Service Manual 378 3231351630000 Air core inductor E2 0 35 1 6 3TR RoHS 379 3231351640000 Air core inductor E2 0 35 1 6 4TL ROHS 380 3231351640000 Air core inductor E2 0 35 1 6 4TL ROHS 381 3231351640000 Air core inductor E2 0 35 1 6 4TL ROoHS 382 3231351650000 Air core inductor E2 0 35 1 6 5TL RoHS 403 3399990000080 Zener diode EDZTE616 8B SO RoHS 410 3403008000010 Transistor DTC114EE TL RoHS Transistor 28C5108 Y TE85L RoHS Transistor 28C5108 Y TE85L RoHS Transistor 28A1832 GR TE85L RoHS Momentary contact switch 2 55N RoHS Momentary contact switch 2 55N RoHS 24 HVT TC 320 Service Manual 439 410030030000 main 1 21 41 4 5 1 PCB 440 6201648000000 VCO shielding mask 0 30mm00 RoHS 1 441 6201651000000 Filter shielding mask 0 20 00 RoHS 1 Heat sinking module 3 5mm 00 RoHS 51531 REPRE 444 4100320300060 board 4L 5 _______ 1 25 HYT C 320 400 420MHZ Parts Change Record TC 320 Service Manual 320 400 420MHz Parts Change Record Before Change TC 320 VF After Change TC 320 VG N Part N Descripti Ref No a Part N Descripti escription efNo No y art No escription No 98
50. lator the other goes through QT MOD to modulate the VCO Battery Charge Section U604 supplies power to charge battery Charge indicator glows orange while battery is charging and glows green after battery is fully charged Charge indicator also glows green when there s no battery 2 Realization Methods of Basic Functional Modules 2 1 HF Section 2 1 1 Block Diagram of PLL Circuit VCO V_SAVE MOD RIPPLE FILTER SW LOOP FILTER R T PLL circuit generates RF carrier signal for Tx and the first local oscillator signal for Rx Step frequency of the PLL circuit is 6 25 KHz 10 0 KHz or 12 5 KHz In U501 the 21 25MHz reference oscillator signal is divided into 6 25 KHz 10 0 KHz or 12 5 KHz reference frequencies via a fixed counter in PLL The signal output from the VCO Tx RxVCO enters PLL and is processed by the buffer amplifier The amplified signal is further processed in PLL by the variable frequency divider Then the signal is compared with the reference frequency in the phase detector PD of PLL Signal generated from PD passes through a low pass filter and then is sent to the varactors D101 and D102 of VCO so as to control output frequency The signal buffer amplified by PLL also serves as the first local oscillator signal for both Tx and Rx The Q103 switch controls connection status of D105 so as to switch between Rx VCO and Tx VCO When is at high level Tx VCO is valid when R T is at
51. lo 100 680 214 SHUTDOWN a E BYPASS u id C202 GREEN RED Ro 1 7 100 2 8202 1k V_BAT 203 vec 203 0601 0602 T SP2 T 8 4 4 304 305 E Speaker R201 RESP 204 1201 C208 602 470 22 0 220 1 MON 4 AA 0607 C201 4 Ho ou 4 4 NIONS C207 i 5 100 TP610 CHARGE MICIN R621 BG REF 100 D610 VDDA1 1 x C628 026 8 VSSA1 w du 0201 R214 RESET 2SA1832 dk TX RIT 4 W VDDD1 R207 R213 C219 R217 VSSD1 1k FA R215 R216 1000PS 47k BUSY Z WV T 0202 R219 LD 2581824 10k D606 SDA vec RSAG 1EN R629 r l NC C217 4 R218 R203 R204 R205 1M 4 R623 3 3k 3 3k 47k me w R206 206 47k 239595229 R3112Q271A m 4 7 10 08 MOD aa 68k Hr 0 022u lt lt QT_MOD E AF TB K V_BAT R602 2 4 220K 1 0605 2 dum RSAG 1EN 9601 23 1745 220k 1 R223 1606 618 2 3 4 0 6015 0602 47 RT9011J6 vec C615 C616 tu 1000 5 6 gt gt aT_ouT R616 R617 VIN VOUT pet 1 1 C648 47k 47k vds 0604 So SW channel EN2 GND C612 DTC114EE R224 1u 0 01u E 5 i SS usos a 31 470p
52. nna are fed to the SAW filter to filter out undesired out of band interference signal Then the desired RF signal is amplified by Q506 and enters U501 where it is amplified by the high frequency low noise amplifier Afterwards the amplified signal goes through the bandpass filter again to filter out undesired out of band interference signal Desired RF signal is mixed with the first local oscillator signal output from VCO by Q505 to output the first IF signal 21 7MHz which is processed by the IF filter and IF amplifier Q504 Afterwards it is sent to the IF processing circuit of U501 In U501 this first IF signal is mixed with the second local oscillator signal to generate the second IF signal Then the 11 HVT TC 320 Service Manual second IF signal is demodulated by U501 to output audio signal which is sent to MCU for A D conversion and filtering Afterwards the audio signal is divided into two flows One flow is processed by CTCSS CDCSS decoder the other is restored to audio signal through filtering de emphasis decoding signal expansion and D A conversion Then the restored audio signal is amplified by the audio power amplifier IC 0301 to drive the speaker directly 2 2 MCU Control Signal Processing and Audio Power Amplification Circuit diagram of this section is shown as below
53. o 54603 VT 420 CHARG lt se R421 BAT m R203 T aD R204 lt MIX SWAF3 sw MOD_OUT RX LO r X 0401 lt APC D Q505 0404 1 lt AF DEMOD MIC IN XF501 lt DATA STB CK gt IF AMP SWAF 0503 OT OUT U601 D504 3 2502 LD SIG OUT 9501 D505 D503 501 lt X601 lt PLL_VCC E W gt SWAF XB sw sw S ajs BUSY SQL al gt H d d XT101 E V BAT H Ane sw 5 SAVE VR VR 9603 R305 2 ek 9501 EEPROM 1 L gt 0306 0501 0502 R602 R603 R103 C132 RFC U605 RESET V 9604 V V n QT_OUT AF BUSY 0602 lt gt pc bc sw vco VT SW 6601 BATTERY 1 0102 0104 D105 TX RX SW D101 D103 Q103 D102 RIPPLE FILTER SW VR U604 LOOP FILTER V_SAVE X TC 320 Schematic Diagram RF
54. or 0402 4700 J 1 16W RoHS 1 2201 86 3001054720000 Chip resistor 0402 4 7 J 1 16W RoHS 1 8622 T3D 89 3001054730000 Chip resistor 0402 47 J 1 16W RoHS 1 R103 90 3001054730000 Chip resistor 0402 47KQ J 1 16W RoHS 1 R106 96 3001054730000 Chip resistor 0402 47 J 1 16W RoHS 1 98 3001054730000 Chip resistor 0402 47 J 1 16W RoHS 1 R616 T4G 99 3001054730000 Chip resistor 0402 47KQ J 1 16W RoHS 1 746 Chip resistor 0402 47KQ J 1 16W RoHS HVT TC 320 Service Manual 1137 3002991030150 Adjustable resistor 2 7 2 0 0 9 10 30 ROoHS HVT TC 320 Service Manual Chip capacitor 0402 100PF J 50V RoHS Chip capacitor 0402 470PF K 50V RoHS 20 HVT TC 320 Service Manual Chip capacitor 0402 470PF K 50V RoHS Chip capacitor 0402 1000PF K 50V RoHS Chip capacitor 0402 0 01UF K 25V RoHS 21 HVT TC 320 Service Manual Chip capacitor 0402 0 1UF 16V RoHS Chip capacitor 0402 0 1UF K 16V RoHS 22 HVT TC 320 Service Manual 335 3102992000040 Adjustable capacitor 3 2 2 5 1 25mm RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 600042596 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0603 6000 25 RoHS Chip ferrite bead 0805 600 25 ROHS Chip ferrite bead 0805 600 25 RoHS Ch
55. power on alert The speaker orks normally Clock crystal normally normally MCU works normally 54 TC 320 Service Manual Replace the speaker Check U602 Replace X601 Check battery detect pin 40 EEPROM detect pin 83 84 and the reset IC pin 93 HVT TC 320 Service Manual Disassembly and Assembl Disassembly 1 Power off the radio 2 Remove the belt clip Remove the battery Push the battery latch upwards Remove the rear cover Take out the batter by lifting its bottom side 4 Remove the antenna 55 HVT TC 320 Service Manual Remove the Channel Selector Knob nut and waterproof ring Deattach the Channel Selector Knob Cover Unfasten the screw Remove Channel Selector Knob Remove the nut and waterproof ring Disassemble chassis of the radio Unfasten the 4 screws on the chassis Lift the bottom of the chassis oO Pull the chassis out 7 Disassemble the main PCB a Remove the two fixing screws on the PCB b Remove the PCB and supporting ring of the Channel Selector Knob Note Take care of the speaker cable and the charging piece at the bottom Charging piece 56 HVT TC 320 Service Manual Assembly 1 Install the ma
56. r Output 0 4W Speaker impedance 8 ohm Rated Audio Distortion lt 5 0 4 Transmitter RF Power Output 2W 0 5W Spurious and Harmonics lt 27dBm Modulation Limiting 55 2 5 2 FM Noise 238 34dB Modulation Distortion lt 5 Note All Specifications are tested according to TIA EIA 603 and subject to change without notice due to continuous development 75 HYT endeavors to achieve the accuracy and completeness of this manual but no warranty of accuracy or reliability is given All the specifications and designs are subject to change without notice due to continuous technology development Changes which may occur after publication are highlighted by Revision History contained in Service Manual No part of this manual may be copied reproduced translated stored in a retrievable system distributed or transmitted in any form or by any means electronic or mechanical for any purpose without the express written permission of HYT
57. save it Rotate the Channel Selector Knob to CH3 and wide bandwidth and low frequency are selected Adjust the waveform to ee VR601 ke it similar t Waveform Short press PTT key to switch among A square waveform different frequencies circularly long press PTT key to switch between Communication Test Set Antenna wide narrow bandwidth BPF lt 20Hz 300Hz Rotate the Channel Selector Knob to Press or key to make and wide bandwidth and low adjustments CDCSS Wide frequency are selected until the CDCSS 500 900Hz Deviation Bandwidth Press PTT key to switch between deviation meets the different frequencies low medium requirements and high 47 TC 320 Service Manual Short press SK key to enter the Press or key to narrow bandwidth and select low make adjustments Narrow frequency until the CDCSS 300 500Hz Bandwidth Press PTT key to switch between deviation meets the different frequencies low medium requirements and high Rotate the Channel Selector Knob to CH5 CH6 and CH7 with CTCSS Use or key to make Wd respectively corresponding to slight ide low medium and high frequencies adjustments until the 500 900Hz Bandwidth 5241 Short press PTT key to switch CTCSS deviation CTCSS between different CTCSS frequencies Communication Test Set meets the requirements Antenna Deviation on eac
58. ter SAWF503 to filter out undesired out of band interference signal The desired RF signal is mixed with the first local oscillator signal output from VCO by Q505 The newly generated signal is processed by the crystal filter XF501 to get the first IF signal desired signal After being amplified by Q504 this IF signal enters the RF chip U501 and is mixed with the second local oscillator signal to generate the second IF signal The second IF signal is demodulated by U501 to output audio signal which is sent to MCU for A D conversion and filtering Afterwards the audio signal is divided into two flows One flow is processed by CTCSS CDCSS decoder the other is restored to audio signal through filtering de emphasis decoding signal expansion and D A conversion Then the restored audio signal is amplified by the audio power amplifier U301 to drive the speaker directly Power Supply Section The 3 7V battery voltage is converted to two flows of 3 0V DC voltage by the LDO module 0602 One flow supplies 3 0V VCC for the CPU the other outputs 3 0V V SAVE voltage which goes through Q604 and Q601 respectively to supply under the control TX CTRL 3 0V VT for Tx circuit The V SAVE voltage also goes through Q602 to supply 3 0V VR for Rx circuit HVT TC 320 Service Manual Signaling Encode Signaling encode signal output from the port MCU QT_OUT is divided into two flows One flow goes through RC network to modulate the PLL reference frequency oscil
59. tery voltage is converted to two flows of 3 0V DC voltage by 0602 One flow supplies 3 0V VCC for the CPU the other outputs 3 0V V SAVE which goes through Q601 Q602 and Q604 respectively to supply under the control TX CTRL VT for Tx circuit and VR for Rx circuit U602 also supplies the PLL circuit with voltage V SAVE UART TxD SAVE_CTL Control Power Save in non Power Save status it is at high level EXT MIC Check MIC connection valid for high level Red LED O Red LED 13 P65 Green LED Greed LED 14 P66 Reserve Reserved 15 P67 Reserve Reserved 16 Vssd GND 5 Ground power supply for digital circuit 13 HVT TC 320 Service Manual US Vddd VCC 3 0V Power supply for digital circuit P50 INTO VOL To increase the volume 19 P51 INT1 VOL To decrease the volume P520NT2 Reserve 00000 P53 INT3 POWER Radio On Off Cp P54 INT4 Programmable function key side key valid for low level external pull up resistor connected P55 INT5 PTT key valid for low level external pull up resistor connected 24 P56 INT6 Reserve Reserved 25 P57 INT7 Reserve Reserved 26 Vdd_CLD VCC 3 0V 5 Power supply for digital PA 27 CLD OUTP CLD_OUTP O LINEOUT output positive output of digital PA VSS_CLD Ground power supply for digital PA uno Vdd_CLD VCC 3 0V Power supply for digital PA 31 P77 RF_CTRL O Control Rx
60. y key other than the Power On Off Key to turn it off Repress PTT to initiate a new clone process 3 Target radio status LED solidly glows green during the cloning process and goes out once it finishes 3 Difference between Factory Clone Mode and User Clone Mode 1 User Clone Mode Only clone the data of user mode Test parameters like adjustment frequency adjustment items and base band parameter will not be cloned 2 Factory Clone Mode Clone all the data excluding serial No 4 Instructions 1 Error will occur when data is cloned without cable connection Please refer to 2 2 2 Error may occur during test data clone in Factory Clone mode if you wrongly press the side key and switch into User Clone mode LED flashes red once 3 If battery of the source radio runs low in clone mode red LED will flash and low battery alert will be given as well Adjustment 1 Description of Adjustment Procedures 1 Simultaneously hold down PTT SK and Power On Off Key for more than 4s to enter adjustment mode orange LED flashes After the keys are released the radio will enter the adjustment item in this mode the item entered depends on the position where the Channel Selector Knob locates And LED will flash red or green according to the Rx and Tx status of the adjustment item 2 Or connect the programming cable to the radio for real time adjustment in PC mode 44 HVT TC 320 Service Manual 2 Description of Adjustment Items

TC-320 Service Manual 00 (RoHS)

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