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PT4208 Service Manual

E. The FM processing chip IC5 is broken. Please

change it.

5 The

transmitting red
light is on, but
no voice is
heard by the
recipient.

A. Power module Q11 is broken, so there is no power

output, please change the module.

B. The microphone is broken, please change it.

6 The

receiving

green light is
on, but no voice
is heard.

A. The speaker is broken. Please change it.
B. The audio power amplifier IC8 is broken. Please

change it.

Chapter 9 KBC-70C Charger

9.1 General

Function: Intelligent rapid charging

Applicable battery: KB-70B (1700mAH, 7.4V Li-ion battery)

/ KB-70A (1350mAH, 7.2V Ni-MH Battery)

Identification for battery type: External

Input power: DC12V, 500mA, ripple < 500mV

9.2 Operating Environment

Temperature: -5

℃

± 2

℃

~ +55

℃

± 2

℃

Humidity: 95%@40

℃

9.3 Safety Requirement

Comply with CCC, CE, UL and other safety

requirements.

9.4 Specifications

* Idling input current:

≤

15mA

* Charging terminal maximum idling voltage: 96% ~ 97% of

the input voltage

* Rapid charging current: 410 ± 25mA

* Max. charging time of Ni-MH battery: 285 minutes ± 15

minutes

* Max. charging time of Li-ion battery: 510 minutes ± 30

minutes

* Max. charging voltage: 9.6V ± 0.2V

* Highest battery temperature: +50

℃

± 2

℃

* Specified voltage for charged battery:

Ni-MH battery: Pre-charge when the voltage is lower than

5.5 ± 0.1V. When the battery voltage reaches 6.5 ± 0.1V, the

charging turns to rapid charging. Or pre-charge when the

voltage is lower than 8.3V ± 0.1V. When the battery voltage

reaches 9.6V ± 0.2V, the battery will be deemed as full and

the charging will stop.

Li-ion battery: Pre-charge when the voltage is lower than

6.5 ± 0.1V. When the voltage reaches 6.5 ± 0.1V, the

charging turns to rapid charging.

* During the charging process, battery voltage, battery

temperature rise, - V

△

, charging time, max. battery

temperature will be checked.

* Min. battery voltage:

Ni-MH battery: 5.5V ± 0.1V

Li-ion battery: 6.5V ± 0.1V

* Pre-charge current for battery:

Ni-MH battery: 180mA ± 10mA

Li-ion battery: 90mA ± 10mA

* Pre-charge time: 15 ~ 20 minutes

* Check the battery voltage during the pre-charging process,

when the voltage reaches the threshold of the battery, the

charging will turn to rapid charging.

* Conditions for stopping charging:

Normal conditions: The battery is fully charged. Ni-MH

battery: - V

△

= 30mV ~ 60mV

Abnormal conditions:

(1) The battery temperature is higher than the limit.

(2) The battery voltage is higher than the limit.

(3) The charging time exceeds the limit.

(4) In the pre-charging process, the battery voltage fails to

reach the min. voltage allowed for normal battery.

* Status of the charger after the charging is finished: Ni-MH

battery enters trickle charging status (current: 30mA ±

10mA).

* Charging efficiency:

After being charged under normal temperature, the

battery capacity should not be lower than 90% of its actual

capacity.

After being charged under high temperature, the battery

capacity should not be lower than 70% of its actual capacity.

After being charged under low temperature, the battery

capacity should not be lower than 80% of its actual capacity.

* Other functions:

1. Charging indication

2. Abnormal charging indication

3. Pre-charging function for over-discharged battery

4. Trickle charging function for Ni-MH battery

Содержание PT4208

Страница 1: ......

Страница 2: ...embly for Maintenance 11 Chapter 6 Adjustment 12 Chapter 7 Specifications 16 Chapter 8 Troubleshooting 16 Chapter 9 KBC 70C Charger 17 Appendix 1 Abbreviations 18 Appendix 2 Electronic Parts List 18 Appendix 3 Structural Parts List 29 Appendix 4 Accessories 31 Figure 1 PT4208 Block Diagram 32 Figure 2 PT4208 Schematic Circuit Diagram 420 470MHz 33 Figure 3 PT4208 Main Board Top Layer Position Mark...

Страница 3: ...e near blasting sites or area with electrical blasting cap Replacement Parts All components used for repair should be supplied by Kirisun Components of the same type available on the market are not surely able to be used in this product and we do not guarantee the quality of the product using such components If you want to apply for any component from Kirisun please fill in an application form as ...

Страница 4: ...L10 C229 C127 and D24 to remove unwanted out of band signal and is routed to the low noise amplifier LNA consists of Q20 and its peripheral components where it is amplified Output signal from the LNA passes through a BPF L7 C228 C47 D23 C219 L6 C182 C124 D22 C216 L5 C132 C32 and D21 and goes to the first mixer Q19 PWM wave is output from pin 12 of the MCU The wave is filtered and rectified into ad...

Страница 5: ... has no volume limitation When AFCO is in high level Q35 turns on IC8 starts to operate and the speaker sounds Speaker impedance 16Ω Q38 RX audio signal switch Q51 Warning tone switch Q25 Alert tone switch CTCSS signal filtering Demodulated audio signal from IC5 may contain CTCSS Continuous Tone Control Squelch System or DCS Digital Code Squelch signal The spectrum components of CTCSS DCS are with...

Страница 6: ...re Controlled Crystal Oscillator is divided by the programmable reference divider in IC1 to produce reference frequency of 5kHz or 6 25kHz determined by the preset channel frequency and is controlled by MCU The oscillation frequency from VCO goes to IC1 where it is divided by the programmable swallowing divider and is then compared with the reference frequency to obtain the error signal The signal...

Страница 7: ...CS signal output from pin 12 generated by MCU is filtered by R155 R156 C242 and C243 Then the resulting signal is divided into two parts and sent to VCO and TCXO respectively for modulation The CTCSS DCS signal from the receiver is decoded by MCU pin 49 MCU checks if the CTCSS DCS signal in the receiving signal matches the preset value of the radio and determines whether to open the speaker or not...

Страница 8: ...tch 1 of VHF 16 NC Connect the pull down resistor with VSS 17 PABC P26 O Final power supply H On 18 OSCSI P25 I VCO crystal select and connect the pull down resistor with VSS H 13 L 16 8 19 WNTC P24 O Wideband Narrowband control H Wideband L Narrowband 20 ENC0 P23 I Encoder input 21 ENC2 P22 I Encoder input 22 ENC3 P21 I Encoder input 23 ENC1 P20 I Encoder input 24 PS P17 O PLL power saving contro...

Страница 9: ...MIC amplification unit Q35 2SK1824 Receiver audio output switch Disconnect on Emergency Q36 2SK1824 Receiver audio output switch Table 3 5 Function Description of Diodes Position Mark Model Function Description D1 MA77 Transmitter antenna switch diode D2 MA77 Transmitter antenna switch diode D3 HSC277 VCO output switch D4 HSC277 Antenna toggle switch D5 HSC277 Antenna toggle switch D6 HSC277 VCO o...

Страница 10: ...onnect the radio to the serial port of the PC with the special programming cable Refer to the figure below Figure 4 1 C Turn the computer power ON D Turn the radio power ON E Run the KSP4208 programming software by double clicking on its executive program F Click Program in the main menu of KSP4208 and click Read from radio in the pull down menu to read parameters of the radio to the computer clic...

Страница 11: ...cy point for QT 254 1Hz Deviation Narrowband 18 Five frequency points for DQT Deviation Wideband 19 Center frequency point for DQT Deviation Narrowband 20 Five frequency points for Rx Sensitivity 21 Center frequency of DTMF Deviation Wideband and Narrowband 22 Tx Low Voltage 23 Rx Low Voltage Firmware Programming Mode The radio is in possession with an internal Flash ROM which can be upgraded when...

Страница 12: ...t the terminals of the battery Do not throw the battery into fire Do not remove the housing of the battery by yourself 5 2 Install Remove the belt clip Slide the guide rails on the belt clip along the guide slots on the rear of the battery with proper strength until the belt clip is hooked When removing the belt clip lift the sheet metal on the top of the belt clip with your finger nail or a tool ...

Страница 13: ...7200 R07 Rubber Plug 2 15 203 000558 R05 Spring for Battery Latch 1 16 201 004208 R03 Battery Latch 1 17 204 003208 R02 Dust proof Net for Speaker 1 18 202 004208 R02 Rubber PTT Key 1 19 201 004208 R04 PTT Key 1 20 121 100000 R20 Speaker 1 21 301 20040G R01 Screw M2 0 4 0 12 22 602 04208X HXX Main Board 1 23 201 004208 R05 POGO Pin Socket 1 24 203 004208 R02 Earphone Plate 1 25 203 000558 R07 Ante...

Страница 14: ...0W 12 Standard signal generator Frequency range 10MHz 1000MHz Output level 0 1uV 32mV 127dBm 17dBm 13 Oscilloscope Frequency range DC 20MHz Test range 10mV 20V 14 Audio frequency voltmeter Test range 10mV 10V Recommendation Item 6 7 8 10 11 and 12 listed in the table can be replaced by HP8920 general test set Figure 6 1 External Speaker MIC Plug 6 2 Adjustment Items After changing components durin...

Страница 15: ...oints of Lowest Low Mid High and Highest to make the deviation be 0 8kHz Then click narrowband and adjust the five frequency points to make the deviation be 0 4kHz 6 3 7 CTCSS deviation In the Tuning Mode double click the QT 67 0 DEV item to enter Click wideband and adjust the five frequency points of Lowest Low Mid High and Highest to make the deviation be 0 75kHz Then click narrowband and adjust...

Страница 16: ... Table 6 3 6 4 and 6 5 Table 6 3 VCO Item Test Condition Test Equipment Measurement Terminal Adjustment Parts Requirement Remark Setting BATT terminal voltage 7 5V DMM PD CH Rx low freq point C180 0 7V 0 3V Adjustment VCO lock voltage CH Tx high freq point Lower than 4 5V Observation Table 6 4 Receiver Section Item Test Condition Test Equipment Measure ment Terminal Adjustment Parts Requirement Re...

Страница 17: ...ower 1W 16Ω Audio Distortion 5 7 3 Transmitter Transmitting Power 4W UHF 5W VHF Modulation Mode W 16KφF3E N 11KφF3E Clutter and Harmonic 36 dBm Residual FM 300 3000Hz W 45 dB N 40dB Audio Distortion 300 3000Hz 5 Adjacent Channel Power W 70dB N 60dB Max Deviation W 5kHz N 2 5kHz Chapter 8 Troubleshooting No Problem Causes and Solutions 1 Power on Failure A Unreliable connection between the battery ...

Страница 18: ...as full and the charging will stop Li ion battery Pre charge when the voltage is lower than 6 5 0 1V When the voltage reaches 6 5 0 1V the charging turns to rapid charging During the charging process battery voltage battery temperature rise V charging time max battery temperature will be checked Min battery voltage Ni MH battery 5 5V 0 1V Li ion battery 6 5V 0 1V Pre charge current for battery Ni ...

Страница 19: ...ontrol Squelch System DCS Digital Code Squelch DEMOD Demodulation E2 PROM Electrical Erasable Programmable Read Only Memory HPF High Pass Filter IDC Instantaneous Deviation Control IF Intermediate Frequency LED Light Emitting Diode LNA Low Noise Amplifier LPF Low Pass Filter MCU Micro Control Unit MIC Microphone MOD Modulation MONI Monitor PLL Phase Lock Loop PTT Push to talk RX Receiver SPK Speak...

Страница 20: ...2 Q4 Q5 36 104 TA1298 R01 Chip triode KTA1298 Y ROHS pcs 3 Q29 Q31 Q32 37 104 TC4082 R01 Chip triode KTC4082 KEC ROHS pcs 2 Q1 Q21 38 105 2SJ243 R01 Chip FET field effect transistor 2SJ243 ROHS pcs 1 Q16 39 105 2SK508 R01 Chip FET field effect transistor 2SK508NV K52 ROHS pcs 2 Q14 Q15 40 105 3SK318 R01 Chip FET field effect transistor 3SK318 ROHS pcs 2 Q19 Q20 41 105 RD01MU R01 Chip FET field eff...

Страница 21: ... ROHS pcs 2 R53 R68 86 109 040394 R01 Chip resistor 0402 390K 5 ROHS pcs 1 R165 87 109 040470 R01 Chip resistor 0402 47R 5 ROHS pcs 2 R31 R32 88 109 040471 R01 Chip resistor 0402 470R 5 ROHS pcs 2 R3 R81 89 109 040472 R01 Chip resistor 0402 4 7K 5 ROHS pcs 9 R52 R208 R118 R125 R151 R159 R204 R205 R282 90 109 040473 R01 Chip resistor 0402 47K 5 ROHS pcs 14 R10 R11 R13 R14 R19 R20 R21 R22 R25 R46 R7...

Страница 22: ...2P 0 25P 50V C0G ROHS pcs 3 C89 C110 C132 138 112 043330 R01 Chip capacitor 0402 33P 5 50V C0G ROHS pcs 3 C119 C171 C227 139 112 043333 R01 Chip capacitor 0402 0 033uF 10 16V X7R ROHS pcs 3 C213 C223 C283 140 112 043392 R01 Chip capacitor 0402 3900P 10 50V X7R ROHS pcs 3 C222 C238 C284 141 112 043393 R01 Chip capacitor 0402 0 039uF 10 50V X7R ROHS pcs 2 C252 C299 142 112 0433R0 R01 Chip capacitor ...

Страница 23: ... C273 C292 C298 C308 181 112 073105 R01 Chip capacitor 0805 1uF 80 20 16V Y5V ROHS pcs 1 C306 182 112 073225 R01 Chip capacitor 0805 2 2uF 80 20 10V Y5V ROHS pcs 1 C234 183 112 102106 R02 Chip Ta capacitor TS Model SIZE A 10uF 20 10V ROHS pcs 3 C197 C203 C210 184 112 102156 R01 Chip Ta capacitor TS Model SIZE A 15uF 20 6 3V ROHS pcs 1 C208 185 112 102475 R02 Chip Ta capacitor TS Model SIZE A 4 7uF...

Страница 24: ...it Qty Position Mark 1 101 04208V R02 PT4208PCB VHF FR 4 1 2mm PT4208V 090401 ROHS pcs 1 2 102 0R8C2A R01 MCU R8C 2A R5F212A8SNFP PLQP 64 ROHS pcs 1 IC10 3 102 9140NR R01 Reset IC PST9140NR ROHS pcs 1 IC11 4 102 A31136 R01 IF MF modulation IC TA31136FN SSOP ROHS pcs 1 IC5 5 102 AT2408 R02 Memory IC AT24C08BN SH ROHS pcs 1 IC9 6 102 B15E03 R01 PLL IC MB15E03SL PLL 16 PIN SSOP ROHS pcs 1 IC1 7 102 D...

Страница 25: ...106 LBE010 R01 Chip touch switch SKRTLBE010 ROHS pcs 1 K3 50 108 450C24 R02 Chip phase frequency detector JTBM450CX24 ROHS pcs 1 CD1 51 108 CF450G R02 Chip porcelain filter LTWC450G 450kHz 5kHz ROHS pcs 1 CF1 52 108 XF4995 R01 Chip IF filter 49 95MHz 7 5KHz U 5 2 ROHS pair 2 XF1 XF2 53 109 040000 R01 Chip resistor 0402 0R 5 ROHS pcs 16 C34 C67 C166 C250 R7 R24 R27 R30 R36 R43 R103 R202 R241 R260 R...

Страница 26: ... Chip resistor 0402 680R 5 ROHS pcs 1 R127 101 109 040682 R01 Chip resistor 0402 6 8K 5 ROHS pcs 1 R220 102 109 040683 R01 Chip resistor 0402 68K 5 ROHS pcs 3 R75 R190 R245 103 109 040684 R01 Chip resistor 0402 680K 5 ROHS pcs 1 R77 104 109 040750 R01 Chip resistor 0402 75R 5 ROHS pcs 1 R31 105 109 040753 R01 Chip resistor 0402 75K 5 ROHS pcs 1 R78 106 109 040754 R01 Chip resistor 0402 750K 5 ROHS...

Страница 27: ... R01 Chip capacitor 0402 39P 5 50V C0G ROHS pcs 1 C119 148 112 043392 R01 Chip capacitor 0402 3900P 10 50V X7R ROHS pcs 3 C222 C238 C284 149 112 043393 R01 Chip capacitor 0402 0 039uF 10 10V X7R ROHS pcs 2 C252 C299 150 112 0433R0 R01 Chip capacitor 0402 3P 0 25P 50V C0G ROHS pcs 2 C90 C131 151 112 043470 R01 Chip capacitor 0402 47P 5 50V C0G ROHS pcs 4 C4 C118 C293 C904 152 112 043471 R01 Chip ca...

Страница 28: ...SIZE P 2 2uF 20 10V ROHS pcs 2 C140 C246 188 112 072475 R01 Chip Ta capacitor TP Model SIZE P 4 7uF 20 10V ROHS pcs 7 C201 C202 C207 C273 C292 C298 C308 189 112 073104 R01 Chip capacitor 0805 0 1uF 10 50V X7R ROHS pcs 2 C205 C204 190 112 073105 R01 Chip capacitor 0805 1uF 80 20 16V Y5V ROHS pcs 1 C306 191 112 073225 R01 Chip capacitor 0805 2 2uF 80 20 10V Y5V ROHS pcs 1 C234 192 112 073475 R01 Chi...

Страница 29: ...1 L4 219 115 1R53R0 R04 Chip air cored coil 0 4 1 5 3TL negative high pin ROHS pcs 2 L80 L83 220 115 1R55R0 R02 Chip air cored coil 0 3 1 5 5TR negative high pin ROHS pcs 2 L3 L81 221 115 1R56R0 R04 Chip air cored coil 0 3 1 5 6TR negative high pin ROHS pcs 2 L2 L14 222 115 1R58R0 R03 Chip air cored coil 0 4 1 5 8TR negative high pin ROHS pcs 1 L25 223 117 000000 R04 Chip bead EMI FILTER SMT BLM11...

Страница 30: ...ion PCS 1 203 004208 R01 Al Chassis 1 5 301 20040G R01 Screw M2 0 4 0 2 2 203 000558 007 Antenna Socket 1 6 202 003208 R07 Heat Exchange Silicone Rubber Washer 1 3 202 007200 R06 POGO Pin Waterproof 1 7 204 007200 R03 Sponge for POGO 1 4 202 004208 R01 Main Waterproof 1 Channel Selector Knob ASM No Part No Description PCS No Part No Description PCS 1 201 004208 R07 Channel Selector Knob 1 2 203 00...

Страница 31: ...02A RUBBER PTT KEY 1 14 202 004208 R03A MIC RUBBER WATERPROOF 1 15 202 007200 R06 POGO PIN WATERPROOF 1 16 203 000558 R02 NUT FOR KNOB 2 17 203 000558 R05B SPRING FOR BATTERY LATCH 1 18 203 000558 R07 ANTENNA SOCKET 1 19 203 003208 R09 CIRCLIP 2 20 203 004208 R01A AL CHASSIS 1 21 203 004208 R02A EARPHONE PLATE 1 22 203 007200 R07B NUT FOR ANTENNA SOCKET 1 23 204 003208 R02 DUST PROOF NET FOR SPEAK...

Страница 32: ...ries Name Model Specifications External View Battery KB 70B 7 4V 1700mAh Li Polymer Battery Hand strap KGS 03 Earphone KME 014 KME 015 Charger KBC 70Q Fast Charger DC OUT 12V 800mA Power adaptor KTC 50A1 50C1 50E1 50F1 Antenna KA stubby antenna ...

Страница 33: ...R 5R 5R TI BATT RST BUSY AFCO RX G LED R LED SAVE MUTE 5RC 5TC TXD W588C CN1 AF OUT CD1 DET COLL KEY K1 PTT K2 MONI K3 ALARM K4 SW 7 5V UL RXD BUSY1 ALARM BELL SCLK SDATA CTC OUT BEEP AC CK DATA LE X2 7 3MHz SW1 POW VOL 5RC 5TC 5C Q26 SW Q32 SW Q31 SW Q29 SW Q27 SW Q30 FMMT591 5M MB15E03SL Q11 RF POWER APC APC 5T 450KHZ R59 C223 De emphasized LP IC6 D HP IC6 A HP IC6 B HP Q9 MUTE Q35 SW AC AFCO TD...

Страница 34: ... 4 7uF 16V C45 471 C48 471 K4 PFI R80 100K C49 471 D20 GREEN D19 1 2 3 4 5 6 SW2 ENCODER Q34 DTA144EE L19 BLM11A221S SW1 POW VOL C67 0R C76 C77 10P C78 12P C79 103 C80 474 C81 C152 471 T1 PD Q36 2SK1824 C276 6 8K R157 1K R247 100K C278 102 R158 100K R239 56K R243 100K C281 C31 471 R250 L44 BLM11A221S VC 1 GND 2 VCC 4 OUT 3 X4 16 8MHz R257 100K C289 152 R258 33K R260 0R R259 R256 1K C75 102 C125 47...

Страница 35: ......

Страница 36: ......

Страница 37: ...PT4208 Service Manual 36 Figure 5 PT4208 Main Board Top Layer Position Value Diagram 420 470MHz ...

Страница 38: ...PT4208 Service Manual 37 Figure 6 PT4208 Main Board Bottom Layer Position Value Diagram 420 470MHz ...

Страница 39: ...PT4208 Service Manual 38 Figure 7 PT4208 Main Board Top Layer Layout 420 470MHz ...

Страница 40: ...PT4208 Service Manual 39 Figure 8 PT4208 Main Board Bottom Layer Layout 420 470MHz ...

Страница 41: ...31 471 R250 L44 BLM11A221S VC 1 GND 2 VCC 4 OUT 3 X4 16 8MHz R257 100K C289 152 R258 33K R260 0R R259 R256 1K C75 102 C125 471 C288 10P L45 10uH C282 10P R261 0R C101 104 D13 1SS372 C140 2 2uF 10V R12 100R D308 DAN222 Q24 2SC4919 D24 HVC376B D23 HVC376B D30 1SV305 D21 HVC376B C32 30P C47 33P R84 100K R103 0R R107 100K R79 100K R43 0R C183 105 C186 102 R108 1M C263 102 OSCIN 1 OSCOUT 2 VP 3 VCC 4 D...

Страница 42: ...PT4208 Service Manual 41 Figure 10 PT4208 Main Board Top Layer Position Mark Diagram 136 174MHz ...

Страница 43: ...PT4208 Service Manual 42 Figure 11 PT4208 Main Board Bottom Layer Position Mark Diagram 136 174MHz ...

Страница 44: ...PT4208 Service Manual 43 Figure 12 PT4208 Main Board Top Layer Position Value Diagram 136 174MHz ...

Страница 45: ...PT4208 Service Manual 44 Figure 13 PT4208 Main Board Bottom Layer Position Value Diagram 136 174MHz ...

Страница 46: ...PT4208 Service Manual 45 Figure 14 PT4208 Main Board Top Layer Layout 136 174MHz ...

Страница 47: ...PT4208 Service Manual 46 Figure 15 PT4208 Main Board Bottom Layer Layout 136 174MHz ...

Страница 48: ...PT4208 Service Manual 47 Figure 16 KBC 70C Schematic Circuit Diagram ...

Страница 49: ...PT4208 Service Manual 48 Figure 17 KBC 70C Top Layer Position Value Diagram ...

Страница 50: ...PT4208 Service Manual 49 Figure 18 KBC 70C Top Layer Position Mark Diagram ...

Страница 51: ...PT4208 Service Manual 50 Figure 19 KBC 70C Bottom Layer Position Value Diagram ...

Страница 52: ...PT4208 Service Manual 51 Figure 20 KBC 70C Bottom Layer Position Mark Diagram ...

Страница 53: ...PT4208 Service Manual 52 Figure 21 KBC 70C Layout ...

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