HYT TC-268 Service Manual
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HYT TC-268 Service Manual

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Summary of Contents for HYT TC-268

  • Page 1 cn...

  • Page 2: Table Of Contents

    TC-268 Schematic Diagram． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ． ．...

  • Page 4: General

    If you wear a portable radio on your body, be sure to keep the antenna at least 2.5 centimeters away from your head or body when transmitting. This equipment should be serviced by a qualified technician only. Shenzhen HYT Science and Technology Co., Ltd. reserves the right to change the data contained in this manual without prior notice.

  • Page 5: Brief Introduction

    TC-268/368 Service Manual Brief Introduction 1. Mode User mode: Turn on the power to enter. PC mode：Configure and adjust the radio data via PC software or programmer. 2. Parts description: (1) Antenna (2) Channel (frequency) selector knob Turn the knob to select channel from 1~16(channel 16 may be programmed by your dealer as scan channel).

  • Page 6: Software Description

    TC-268/368 Service Manual Software Description I．Specifications: 1. Use mechanical knob to choose from 16 channels. Frequency: VHF: 136~150MHz VHF: 150~174MHz UHF: 400~420MHz UHF: 450~470MHz 2. Monitor 3. Battery save 4. Audio alarm 5. Auto squelch control (0~9 level) 6. Time-out Timer (TOT) 7.
  • Page 7 (4) Turn off the radio, disconnect the two SELF points on PCB to end mode settings. Take TC-268(2) for example, its number is 2, to initialize its model and channel data: Short circuit the two SELF points on PCB , and turn on the radio, set the channel selector knob at CH2, and then press PTT while holding down MONI, channel data of CH1,CH2,CH3 and CH4 is initialized as the corresponding data of No.2.
  • Page 8 TC-268/368 Service Manual (6) TC-268/368 channel frequency table (after setting): 2CH(Medium) 3CH(Low) 4CH(High) Initial Model Frequency(MHz) IF(MHz) (MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) TC-268(1) 136.000~149.995 140.000 +38.85 143.100 143.100 143.000 143.100 136.000 136.100 149.975 149.900 TC-268(2) 150.000~173.995 150.000...
  • Page 9 TC-268/368 Service Manual 6. Manual Adjusting Mode: Press PTT and MONI simultaneously to turn on the radio，enter manual Adjusting mode 3 seconds later. Choose the settings by turning the channel selector knob CH1-12, use PTT (upward) or MONI (downward) to adjust (Notice: MIC jack shouldn’t be connected with external...
  • Page 10 TC-268/368 Service Manual ENC0 encode Input ENC1 encode Input ENC2 encode Input ENC3 encode Input [PTT] input ,connect RXD RS-232C output RS-232C input MONI [MONI] input SELF Program L: mode setting CNVSS Connect VSS Reset input INT0 Power detection Oscillator(7.3728MHz)

  • Page 11: Circuit Description

    The receiver utilizes double conversion superheterodyne. The first IF is 38.85MHz and the second IF is 450kHZ. The first local oscillator signal is supplied from the PLL circuit. The PLL circuit in the transmitter generates the necessary frequencies. Fig.1 shows the frequencies. TC-268 frequency range: TC-268(1): 136MHz～150MHz TC-268(2): 150MHz～174MHz TC-368 frequency range: TC-368(1): 400MHz～420MHz TC-368(2): 450MHz～470MHz...
  • Page 12 TC-268/368 Service Manual 1-b) Front-end RF amplifier (TC-368) An input signal from the antenna is applied to a RF amplifier (Q203) after passing through a transmit/receive switch circuit (K102 and D103 are off) and a 3-pole LC filter. After the signal is amplified (Q203), the signal is filtered by a band pass filter (a 3-pole LC filter) to eliminate unwanted signals before it is passed to the first mixer.
  • Page 13 TC-268/368 Service Manual FM IF IC200 IC 300 Q302 IC302 Q307 IF AMP AF AMP AF/PF AMP Q304.Q305.Q306 IC301 Q303 W/N SW IC403 Fig. 3. AF Amplifier and squelch 6) Receiving signaling CTCSS/CDCSS 300 Hz and higher audio frequencies of the output signal from IF IC are cut by a low-pass filter (IC301).
  • Page 14 TC-268/368 Service Manual 2) VCO The operating frequency is generated by Q4 in transmit mode and Q3 in receive mode. The oscillator frequency is controlled by applying the VCO control voltage, obtained from the phase comparator, to the varactor diodes (D2 and D4 in transmit mode and D1 and D3 in receive mode). The T/R pin is set high in receive mode causing Q5 and Q7 to turn Q4 off, and turn Q3 on.
  • Page 15 TC-268/368 Service Manual 3-a) RF amplifier (TC-268) The transmit signal obtained from the VCO buffer amplifier Q100, is amplified by Q101. This amplified signal is passed to the power amplifier, Q102 and Q105, which consists of a 2-stage FET amplifier and is capable of producing up to 5W of RF power (See Fig.
  • Page 16 TC-268/368 Service Manual 4) ANT switch and LPF The RF amplifier output signal is passed through a low-pass filter network and a transmit/receive switching circuit before it is passed to the antenna terminal. The transmit/receive switching circuit is comprised of D101, D102 and D103. D102 and D103 turned on (conductive) in transmit mode and off (isolated) in receive mode.

  • Page 17: Tc-268 Parts List 1

    TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 Material No. Material Name Ref No. Print No. 3001060000000 Chip resistor 0603 0Ω J 1/10W R118 3001060000000 Chip resistor 0603 0Ω J 1/10W R123 3001060000000 Chip resistor 0603 0Ω J 1/10W...
  • Page 18 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3001061020010 Chip resistor 0603 1KΩ J 1/10 R508 3001061020010 Chip resistor 0603 1KΩ J 1/10 R536 3001061020010 Chip resistor 0603 1KΩ J 1/10 3001061020010 Chip resistor 0603 1KΩ J 1/10...
  • Page 19 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3001061520000 Chip resistor 0603 1.5KΩ J 1/ R108 3001061520000 Chip resistor 0603 1.5KΩ J 1/ R525 3001061530000 Chip resistor 0603 15KΩ D 1/1 R433 3001061530000 Chip resistor 0603 15KΩ D 1/1...
  • Page 20 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3001062740000 Chip resistor 0603 270KΩ D 1/ R317 3001063300000 Chip resistor 0603 33Ω J 1/10 R212 3001063310010 Chip resistor 0603 330Ω J 1/1 R110 3001063310010 Chip resistor 0603 330Ω J 1/1...
  • Page 21 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3001064730000 Chip resistor 0603 47KΩ J 1/1 R121 3001064730000 Chip resistor 0603 47KΩ J 1/1 R141 3001064730000 Chip resistor 0603 47KΩ J 1/1 3001064730000 Chip resistor 0603 47KΩ J 1/1...
  • Page 22 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3001069130000 Chip resistor 0603 91KΩ D 1/1 R300 3001070000000 Chip resistor 0805 0Ω J 1/8W R310 3001070000000 Chip resistor 0805 0Ω J 1/8W R311 3001070000000 Chip resistor 0805 0Ω J 1/8W...
  • Page 23 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3101061020000 Chip capacitor 0603 1000PF K 5 C102 3101061020000 Chip capacitor 0603 1000PF K 5 C104 3101061020000 Chip capacitor 0603 1000PF K 5 C105 3101061020000 Chip capacitor 0603 1000PF K 5...
  • Page 24 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3101061020000 Chip capacitor 0603 1000PF K 5 C414 3101061020000 Chip capacitor 0603 1000PF K 5 C416 3101061020000 Chip capacitor 0603 1000PF K 5 C427 3101061020000 Chip capacitor 0603 1000PF K 5...
  • Page 25 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3101061040010 Chip capacitor 0603 0.1UF K 16 C327 3101061040010 Chip capacitor 0603 0.1UF K 16 C398 3101061040010 Chip capacitor 0603 0.1UF K 16 3101061040010 Chip capacitor 0603 0.1UF K 16...
  • Page 26 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3101063320000 Chip capacitor 0603 3300PF K 5 C512 3101063330030 Chip capacitor 0603 0.033UF K C318 3101063330030 Chip capacitor 0603 0.033UF K C320 3101063330030 Chip capacitor 0603 0.033UF K C321 3101063330030 Chip capacitor 0603 0.033UF K...
  • Page 27 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3101072240000 Chip capacitor 0805 0.22UF K 2 3101081050010 Chip capacitor 1206 1UF Z 25V C121 3101081050010 Chip capacitor 1206 1UF Z 25V C417 3102992000009 Trimmer capacitor 3.2*2.3* 1.45 6...
  • Page 28 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3213306682009 Multi-layers chip inductor 0603 6.8uH MLF1 3213306682009 Multi-layers chip inductor 0603 6.8uH MLF1 3214412751009 Inductor 1008 0.75uH C2520 L204 3215106560009 Bobbin inductor 0603 56nH LLQ16 L209 3215106560009 Bobbin inductor 0603 56nH LLQ16...
  • Page 29 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3401002000099 Transistor 2SC5108-Y(TE85L) Q100 3401002000099 Transistor 2SC5108-Y(TE85L) 3401002000099 Transistor 2SC5108-Y(TE85L) 3403007000009 Transistor DTA114EE(TL) PNP Q200 3403007000029 Transistor DTA114YE(TL) PNP Q402 3403007000049 Transistor DTA123JE PNP Roh Q408 3403007000069 Transistor DTA143ZE PNP Roh...
  • Page 30 TC-268/368 Service Manual Parts List 1 TC-268 (1) Parts List 1 3605008005079 Operational amplifier NJM2904V dual IC100 3605008005079 Operational amplifier NJM2904V dual IC301 3608015000000 Power management IC (regulator) XC6201P IC404 3609004005179 Reset IC PST9140NR MITSU IC400 3610004002979 Single chip microcomputer M38034M4-416FP#U...
  • Page 31 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 Material No. Material Name Ref No. Print No. 3001060000000 Chip resistor 0603 0 Ω J 1/10W R118 3001060000000 Chip resistor 0603 0 Ω J 1/10W R123 3001060000000 Chip resistor 0603 0 Ω J 1/10W...
  • Page 32 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3001061020010 Chip resistor 0603 1K Ω J 1/10 R536 3001061020010 Chip resistor 0603 1K Ω J 1/10 3001061020010 Chip resistor 0603 1K Ω J 1/10 R608 3001061020010 Chip resistor 0603 1K Ω J 1/10...
  • Page 33 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3001061520000 Chip resistor 0603 1.5K Ω J 1/ R525 3001061530000 Chip resistor 0603 15K Ω D 1/1 R433 3001061530000 Chip resistor 0603 15K Ω D 1/1 R434 3001061530000 Chip resistor 0603 15K Ω D 1/1...
  • Page 34 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3001063300000 Chip resistor 0603 33 Ω J 1/10 R212 3001063310010 Chip resistor 0603 330 Ω J 1/1 R110 3001063310010 Chip resistor 0603 330 Ω J 1/1 R144 3001063310010 Chip resistor 0603 330 Ω J 1/1...
  • Page 35 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3001064730000 Chip resistor 0603 47K Ω J 1/1 R141 3001064730000 Chip resistor 0603 47K Ω J 1/1 3001064730000 Chip resistor 0603 47K Ω J 1/1 R307 3001064730000 Chip resistor 0603 47K Ω J 1/1...
  • Page 36 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3001070000000 Chip resistor 0805 0 Ω J 1/8W R310 3001070000000 Chip resistor 0805 0 Ω J 1/8W R311 3001070000000 Chip resistor 0805 0 Ω J 1/8W R540 3001080590000 Chip resistor 1206 0.5 Ω J 1/4...
  • Page 37 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3101061020000 Chip capacitor 0603 1000PF K 5 C106 3101061020000 Chip capacitor 0603 1000PF K 5 C107 3101061020000 Chip capacitor 0603 1000PF K 5 C109 3101061020000 Chip capacitor 0603 1000PF K 5...
  • Page 38 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3101061020000 Chip capacitor 0603 1000PF K 5 C427 3101061020000 Chip capacitor 0603 1000PF K 5 3101061020000 Chip capacitor 0603 1000PF K 5 3101061020000 Chip capacitor 0603 1000PF K 5...
  • Page 39 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3101061040010 Chip capacitor 0603 0.1UF K 16 3101061040010 Chip capacitor 0603 0.1UF K 16 C400 3101061040010 Chip capacitor 0603 0.1UF K 16 C525 3101061040010 Chip capacitor 0603 0.1UF K 16 3101061040010 Chip capacitor 0603 0.1UF K 16...
  • Page 40 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3101063330030 Chip capacitor 0603 0.033UF K C321 3101063330030 Chip capacitor 0603 0.033UF K C503 3101063330030 Chip capacitor 0603 0.033UF K C702 3101063900000 Chip capacitor 0603 39PF J 50V 3101063920000...
  • Page 41 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3102992000009 Trimmer capacitor 3.2*2.3* 1.45 6 TC201 3102992000049 Trimmer capacitor 3.2*2.5*1.25mm 3102992000049 Trimmer capacitor 3.2*2.5*1.25mm 3104071560020 Tantalum capacitor 0805 15UF M 6.3V C331 3104071560020 Tantalum capacitor 0805 15UF M 6.3V...
  • Page 42 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3215106560009 Bobbin inductor 0603 56nH LLQ16 L209 3215106560009 Bobbin inductor 0603 56nH LLQ16 L214 3216006561009 Inductor 0603 560nH SGMI16 3221506601009 Chip ferrite bead 0603 600 Ω ± 3221506601009 Chip ferrite bead 0603 600 Ω ±...
  • Page 43 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3403007000009 Transistor DTA114EE(TL) PNP Q200 3403007000029 Transistor DTA114YE(TL) PNP Q402 3403007000049 Transistor DTA123JE PNP Roh Q408 3403007000069 Transistor DTA143ZE PNP Roh Q504 3403007000079 Transistor DTA144EE PNP Roh Q109 3403007000079...
  • Page 44 TC-268/368 Service Manual Parts List 1 TC-268 (2) Parts List 1 3609004005179 Reset IC PST9140NR MITSU IC400 3610004002979 Single chip microcomputer M38034M4-416FP#U 1 IC403 3612031004409 Memory AT24C08AN-10SI-2 IC401 3619006005210 Low voltage detector IC R3111N451C 0. IC402 3701012850019 TCXO 12.8MHz NSA0 3701737230009 Crystal 7.3728MHz...

  • Page 45: Tc-368 Parts List 1

    TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 Material No. Material Name Ref No. Print No. 3001060000000 Chip resistor 0603 0 Ω J 1/10W R120 3001060000000 Chip resistor 0603 0 Ω J 1/10W 3001060000000 R147 Chip resistor 0603 0 Ω J 1/10W...
  • Page 46 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3001061020010 R427 Chip resistor 0603 1K Ω J 1/10 3001061020010 Chip resistor 0603 1K Ω J 1/10 R536 3001061020010 Chip resistor 0603 1K Ω J 1/10 R608 3001061020010 R703 Chip resistor 0603 1K Ω...
  • Page 47 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3001061520000 R525 Chip resistor 0603 1.5K Ω J 1/ 3001061530000 Chip resistor 0603 15K Ω D 1/1 R143 3001061530000 Chip resistor 0603 15K Ω D 1/1 R433 3001061530000 R434 Chip resistor 0603 15K Ω...
  • Page 48 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3001062740000 R316 Chip resistor 0603 270K Ω D 1/ 3001062740000 Chip resistor 0603 270K Ω D 1/ R317 3001063310010 Chip resistor 0603 330 Ω J 1/1 R108 3001063310010 R113 Chip resistor 0603 330 Ω...
  • Page 49 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3001064720000 R541 Chip resistor 0603 4.7K Ω J 1/ 3001064730000 Chip resistor 0603 47K Ω J 1/1 R107 3001064730000 Chip resistor 0603 47K Ω J 1/1 3001064730000 R118 Chip resistor 0603 47K Ω J 1/1...
  • Page 50 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3001068210010 R429 Chip resistor 0603 820 Ω J 1/1 3001068210010 Chip resistor 0603 820 Ω J 1/1 R532 3001068220000 Chip resistor 0603 8.2K Ω J 1/ 3001068220000 R339 Chip resistor 0603 8.2K Ω J 1/...
  • Page 51 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3101060400010 Chip capacitor 0603 4PF B 50V 3101060500010 Chip capacitor 0603 5PF B 50V C150 3101060500010 Chip capacitor 0603 5PF B 50V C222 3101060500010 Chip capacitor 0603 5PF B 50V...
  • Page 52 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3101061030010 Chip capacitor 0603 0.01UF K 2 C214 3101061030010 Chip capacitor 0603 0.01UF K 2 C217 3101061030010 Chip capacitor 0603 0.01UF K 2 C220 3101061030010 Chip capacitor 0603 0.01UF K 2...
  • Page 53 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3101061590010 Chip capacitor 0603 1.5PF B 50 C255 3101061800000 Chip capacitor 0603 18PF J 50V C105 3101061800000 Chip capacitor 0603 18PF J 50V C219 3101061800000 Chip capacitor 0603 18PF J 50V 3101061830000 Chip capacitor 0603 0.018UF K...
  • Page 54 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3101064710000 Chip capacitor 0603 470PF K 50 C139 3101064710000 Chip capacitor 0603 470PF K 50 C141 3101064710000 Chip capacitor 0603 470PF K 50 C143 3101064710000 Chip capacitor 0603 470PF K 50...
  • Page 55 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3101064740000 Chip capacitor C333 3101065600000 Chip capacitor 0603 56PF J 50V C338 3101065620010 Chip capacitor 0603 5600PF K 5 C308 3101066800000 Chip capacitor 0603 68PF J 50V 3101066800000 Chip capacitor 0603 68PF J 50V...
  • Page 56 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3210306150009 Multi-layers chip inductor 0603 15nH LQG18 L102 3210306180000 Multi-layers chip inductor 0603 18nH LQG18 L101 3210306180000 Multi-layers chip inductor 0603 18nH LQG18 3210306220009 Multi-layers chip inductor 0603 22nH LQG18...
  • Page 57 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3303020100029 Switching diode MA2S11100L SS- 3303020100029 Switching diode MA2S11100L SS- 3303020100089 Switching diode MA2S07700L D100 3303020100089 Switching diode MA2S07700L D102 3303020100089 Switching diode MA2S07700L D103 3303020100089 Switching diode MA2S07700L...
  • Page 58 TC-268/368 Service Manual Parts List 1 TC-368 (2) Parts List 1 3499000000119 Transistor 2SC4619TLP SOD-3 Q201 3503020000109 FET 2SK508NV(K52) S 3499000000159 Transistor UMC4N(TR) 3499000000179 Transistor UFMMT591 PNP SOT Q406A 3499000000179 Transistor UFMMT591 PNP SOT Q406B 3499000000189 Transistor UFMMT717 Q104 3501020000019...
  • Page 59 TC-268/368 Service Manual Adjust Description Program TC-268/TC-368 via programmer or PC programming software, or manual adjustment. Adjust TC-268/TC-368 in manual adjust mode as follows (refer to “software descriptions ” for the manual adjusting and model setting). Ⅰ . Instrument: 1. Communication analyzer 1 set 2.
  • Page 60 TC-268/368 Service Manual Adjust the receiver section: (enter manual mode) Measurement Adjustment Specific Item Condition ations/R Termina Test equip parts Method emarks TC201 Adjust the undee to the top, the 1:CH:RX center TC202 bandwidth is about 10MHz, the turn to channel 4...
  • Page 61 TC-268/368 Service Manual Adjust the transmitter section: Measurement Adjustment Specificatio Item Condition ns/Remarks Test equip Terminal Parts Method CH: TX center 8.Transmit Synthetical PTT(up)M Turn to channel 1 in Adjust it to center frequency Error<150Hz frequency test ONI(down) manual mode Adjust it to: 4.0<Po<4.8 W...
  • Page 62 TC-268/368 Service Manual 1.CH: TX center, Adjust it to:0.75kHz±50Hz Wide turn to channel 11 in manual mode 14.CDCSS 2.CH:TX center, turn to channel 12 Adjust it to:0.35kHz±50Hz Narrow in manual mode Turn to channel 3 in PTT（up） 15.Low manual mode,...

  • Page 63: Disassembly

    TC-268/368 Service Manual Disassembly Separating the case assembly from the chassis 1. Remove the two knobs and three ring nuts ① ② 2. Remove the two screws ③ Expand the right and left sides of the bottom of the case assembly，lift the chassis, and remove it from the front cover.

  • Page 64: Exploded View

    TC-268/368 Service Manual Exploded View...

  • Page 65: Parts List 2

    TC-268/368 Service Manual Parts List 2 TC-268 Parts List 2 Material No. Material Name Remarks 6000146000050 Front cover 6000159101000 PTT key cover 6100091000000 PTT key 7209002200000 Nut(antenna pedestal) Antenna TC-268(1) 6000161100000 Channel selector knob 6000162101000 Volume control knob 6201006000000 Inner liner knob...
  • Page 66 TC-268/368 Service Manual Parts List 2 TC-368 Parts List 2 Material No. Material Name Remarks 6000146000050 Front cover 6000159101000 PTT key cover 6100091000000 PTT key 7209002200000 Nut(antenna pedestal) Antenna TC-368(1) 6000161100000 Channel selector knob 6000162101000 Volume control knob 6201006000000 Inner liner knob...

  • Page 67: Packing

    TC-268/368 Service Manual Packing Owner’s Manual Strap...

  • Page 68: Tc-268 Pc Board View

    TC-268 PC Board View Top Layer Version 01 PDF created with pdfFactory trial version www.pdffactory.com...
  • Page 69 TC-268 PC Board View Bottom Layer Version 01...

  • Page 70: Tc-368 Pc Board View

    TC-368 PC Board View Top Layer Version 01 PDF created with pdfFactory trial version www.pdffactory.com...
  • Page 71 TC-368 PC Board View Bottom Layer Version 01...

  • Page 72: Tc-268 Level Diagram

    TC-268/368 Service Manual TC-268 Level Diagram -116.5dBm -113dBm -98dBm -103dBm -104dBm -106.5dBm -103dBm 1018mVrms 175mVrms 23.5mVrms 0.63Vrms L112 L208 IC200 IC302 R224 IC300 Q203 Q307 R211 XF200 Q202 C212 R217 Q201 C145 L203, L214 R210 1st Local 0.1Vrms RF center IF 38.85MHz...

  • Page 73: Tc-368 Level Diagram

    TC-268/368 Service Manual TC-368 Level Diagram Rx Section -116.5dBm -113dBm -98dBm -103dBm -104dBm -106.5dBm -103dBm 1018mVrms 175mVrms 23.5mVrms 0.63Vrms L112 L208 IC200 IC302 R224 IC300 Q203 Q307 R211 XF200 Q202 C212 R217 Q201 C145 L203, L214 R210 1st Local 0.1Vrms RF center IF 38.85MHz...

  • Page 74: Tc-268 Block Diagram

    TC-268 Block Diagram TC-268S Block Diagram 1SV214 TX VCO BUFF AMP LO SW DRIVE AMP FINAL AMP ANT SW D100 Q100 D101 Q101 Q102 Q105 D200 2SC5108 2SC4988 RD01MUS1 RD07MVS1 MA2Z077 2SK1875 2SC5108 MA2S077 LOOP FILTER F.CONT D2.D4 1SV283 2SC5108 RX VCO F.CONT...

  • Page 75: Tc-368 Block Diagram

    TC-368 Block Diagram TC368 Block Diagram MA360 TX VCO BUFF AMP LO SW DRIVE AMP FINAL AMP ANT SW D100 Q100 Q101 Q102 Q105 D101 D200 2SC4226 2SC5108 2SC5108 HSC277 2SC5108 HVU131 RD01 RD07 F.CONT LOOP FILTER D2.D4 MA2S376 2SC5108 RX VCO RIPPLE FILTER F.CONT...

  • Page 76: Tc-268 Schematic Diagram

    TC-268 Schematic Diagram C140 C144 C147 7.2V 2SC5108(Y) Q105 L111 C131 MA77 C137 L114 L115 L117 470p RD07 7.5V L110 Q102 L107 470p 1000p T:1V R118 C116 D101 RD01 100p 3.8V R:1.3V 4.9V 1000p 1000p C108 R112 C109 L103 33NH...

  • Page 77: Tc368 Schematic Diagram

    R506 C518 3.3K R525 0.033u 0.01u 1.5k 0.022u C506 Q500 C519 R530 AUDIO MUTE SW R532 2SK1824 Q503 C701 Q302 SHENZHEN HYT SCIENCE&TECHNOLOGY 470p 2SC4919 3900p 4.7u/6.3 2SK1824 CO.,LTD C704 1SS372 DAN222 File: 6800p D500 D501 Title: TC368S 原理图 18004700...

  • Page 78: Specifications

    TC-268/368 Service Manual Specifications General TC-268(1) TC-268(2) TC-368(1) TC-368(2) Frequency range 136MHz~150MHz 150MHz~174MHz 400 MHz ~420 MHz 450 MHz ~470 MHz Channel capacity Channel Spacing 25kHz / 12.5kHz Antenna impedance 50Ω MIC impedance 2KΩ Operating Voltage 7.2V DC Frequency stability ±2.5×10...

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Tc-368

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