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RM8125

SERVICE MANUAL

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Summary of Contents for RM8125 Series

Page 1: ...RM8125 SERVICE MANUAL ...

Page 2: ...RM8125 Block Diagram 23 Figure 2 RM8125 Main Board Schematic Circuit Diagram 24 Figure 3 RM8125 Main Board Top Layer Position Mark Diagram 25 Figure 4 RM8125 Main Board Top Layer Position Value Diagram 26 Figure 5 RM8125 Main Board Bottom Layer Position Mark Diagram 27 Figure 6 RM8125 Main Board Bottom Layer Position Value Diagram 28 Figure 7 RM8125 Key Board Schematic Circuit Diagram 29 Figure 8 ...

Page 3: ...product using such components If you want to apply for any component from Kirisun please fill in an application form as below e g Component Application Form Radio Model Component Position Mark Model Specifications Part No Qty RM8125 01 FET Q18 3SK 105 3SK318 R01 1 RM8125 01 Triode Q5 2SC3357 104 SC3357 R01 1 1 3 Service All the Kirisun products are subject to the service warranty After sales servi...

Page 4: ...ator and the black conductor to the negative terminal At last ring the remained conductor and fix it Note Please guarantee sufficient relaxation of the power cable in the car so that the radio can be conveniently disassembled assembled and repaired in the state of power connection 4 Installation Warning For passenger safety please install the radio securely using the supplied mounting bracket so t...

Page 5: ... change the QT DQT setting of current channel by pre programmed OST list 9 Power Level This allows the radio user to adjust the transmit power setting to High Mid or Low Meanwhile the LCD will display H M L respectively 10 Squelch Level Press the button to enter Squelch Level Adjustment Mode then the user can adjust the squelch level by pressing Press P3 button to save the selected squelch level a...

Page 6: ...s generated by frequency tripler X1 The transmitter signal is produced by the frequency synthesizer The reference frequency of the frequency synthesizer is provided by TCXO 4 2 Principle of Receiver RX MCF 49 95MHz IF SYSTEM CF1 450KHz H CF2 450KHz F X3 multiply AF AMP TCXO 16 8MHz NJM2902 BPF RF AMP BPF ANT SW ANT IC11 MCU 1st Local OSC D3 D11 Q18 Q19 IC4 IC9 IC9 TDA1519C Figure 4 2 Principle of ...

Page 7: ...Q11 3 2ND LOCAL AMP Q7 BUFF 5V Figure 4 4 Frequency Synthesizer RM8125 adopts PLL type frequency synthesizer The frequency synthesizer consists of reference oscillator voltage control oscillator VCO programmable divider phase comparator and low pass filter LPF Tx VCO unit consists of Q6 D1 D4 D5 and D6 D8 is the modulation circuit of Tx VCO Rx VCO unit consists of Q12 D14 D16 D17 and D18 IC3 MB15E...

Page 8: ... receiver 4 7 MCU Unit MCU unit controls the operation of each unit of the radio so that all functions can be realized Communicate with external PC Access the status data of the radio Control the PLL to generate Rx and Tx local oscillator frequencies Obtain status parameters of the working channel Control status of LED indicator Control power supply for each unit Check the actions of each function...

Page 9: ...rt Description of MCU MB90F882 No Port name Pin Name I O Function 1 GLED P40 O Rx Green Indicator H on 2 NC 3 NC 4 NC 5 P5 P32 I P5 Button Input 6 P1 P33 I P1 Button Input 7 P2 P34 I P2 Button Input 8 P3 P35 I P3 Button Input 9 P4 P36 I P4 Button Input 10 POWER P37 I Power Button Input 11 NC 12 NC 11 NC 12 NC 13 VCC VCC CPU Power Input 14 VSS VSS GND 15 C C 16 LCD RST P42 O LCD Reset Control 17 LC...

Page 10: ...ng status parameters IC7 TDA7297D Rx AF power amplification IC1 RA30H1317M Tx final power amplification IC17 TA78033AF 3V voltage regulation output IC16 L7808CV 8V voltage regulation output IC18 NJM78L05UA 5V voltage regulation output IC19 UPB1509GV Frequency divider Q9 DTC144EE APC control switch Q12 2SK508NV Rx VCO oscillation circuit Q14 2SC4617 VCO power filter Q11 2SC5108 Rx 2nd local oscilla...

Page 11: ...rameters should be reprogrammed Therefore Kirisun has specially designed a set of Chinese English programming software KSP8100 with friendly interface convenient operation and visualized display for setting functional parameters of the radio Steps for setting the functional parameters of the radio by PC are as follows A Install KSP8100 on the PC B Connect the mobile radio to the serial port of the...

Page 12: ...cessfully click on OK to exit 6 If you want to continue programming other radios repeat steps 1 to 5 Chapter 6 Disassembly and Assembly for Maintenance The radio is a kind of sophisticated communication equipment with precise structure and small size You should assemble and disassemble it carefully during the maintenance The instructions for the assembly and disassembly are as follows 6 1 Exploded...

Page 13: ... on the baffle plate and then remove the metal baffle plate the power cable fastener and the rubber plug for external speaker jack See figure below Remove the flat cable and the speaker wire and then remove the solder between the antenna connector and the RF PCB with a soldering iron Screw off the screws and take the RF PCB out of the top Al case carefully See figure below 6 2 2 Key PCB disassembl...

Page 14: ...MHz 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 7 1 External Microphone Interface Definition 7 2 Adjustment After changing components during the maintenance it is necessary to test the rad...

Page 15: ... be 20Hz 300Hz a In the Tuning Mode double click QT 67 Deviation and select Wideband Adjust the five frequency points of Lowest Low Mid High and Highest respectively within the range of 0 255 to make the deviation be 0 75kHz b In the Tuning Mode double click QT 67 Deviation and select Narrowband Adjust the value within the range of 0 255 to make the deviation be 0 35kHz 7 2 8 QT 151 Deviation set ...

Page 16: ...n and select Wideband Choose a frequency point and click Begin the programming software will adjust the value automatically When the value keeps stable click OK the adjustment of that frequency point is completed Use the method to adjust the five frequency points of Lowest Low Mid High and Highest respectively f In the Tuning Mode input RF signal with the same frequency as the adjusted frequency p...

Page 17: ...d Choose a frequency point and click Begin the programming software will adjust the value automatically When the value keeps stable click OK the adjustment is completed 7 3 Adjustment Description Refer to Table 7 3 7 4 and 7 5 for the above mentioned adjustment Table 7 3 VCO Item Test Condition Test Equipment Measurement Terminal Adjustment Parts Requirement Remark Setting BATT terminal voltage 13...

Page 18: ...elch Open Sensitivity 121dBm SQL1 Rx Residual Output W 45dB N 40dB Modulation Rx Bandwidth W 7kHz N 3 5kHz Adjacent Channel Selectivity W 70dB N 60dB Intermodulation Rejection 65dB Spurious Response Rejection 70dB Audio Output Power 4W balanced distortion 5 8 Rx Current Consumption 1A Standby Current 100mA 8 3 TX Part Tx Power 20W 5W 13 8V DC Frequency Stability 2 5ppm Max Modulation Deviation 5kH...

Page 19: ...fier IC7 is broken Please change a new IC C The switching tube Q33 is broken please change a new one D The operational amplifier IC9 is broken please change a new IC 7 Abnormal programmin g A The programming cable connection is abnormal check the cable connection B The RS 232 serial port output of the computer is abnormal please check the computer C The radio s socket for programming cable is in p...

Page 20: ...ble capacitor diode ROHS Chip Voltage regulator diode ROHS Chip switch diode ROHS diode ROHS Chip transistor ROHS Chip transistor ROHS Chip transistor ROHS Chip transistor Chip transistor Chip transistor Chip transistor Chip transistor Chip transistor Chip transistor Chip FET field effect transistor Chip FET field effect transistor Chip FET field effect transistor Chip phase frequency detector Chi...

Page 21: ...RM8125 Service Manual 19 Chip trimming resistor ...

Page 22: ...RM8125 Service Manual 20 Model Model Model Model Model Model Model Model ...

Page 23: ...RM8125 Service Manual 21 Chip trimming capacitor ...

Page 24: ...RM8125 Service Manual 22 Appendix 3 Structural Parts List ...

Page 25: ...RM8125 Service Manual 23 Figure 1 RM8125 Block Diagram 3 5V ...

Page 26: ... R195 4 7K TO1 R298 10K A0 1 A1 2 A2 3 GND 4 SDA 5 SCL 6 TEST 7 VCC 8 R230 100K R219 1K SDA SC L TXD DEV1 S DA S CL TXL HOOK MD SB C 8RC 8TC TGSW PA VCCN DEV2 A MU RESET INT RXD 2TOUT SCL 53 SDA 54 POWER 5 P1 6 P2 7 P3 8 P4 9 P5 10 GLED 11 RLED 12 VCC 13 VSS 14 C 15 LCD RST 16 LCD BLC 17 LCD DAT 18 LCD WR 19 LCD RD 20 LCD CS 21 MICDAT 22 HOOK 23 DEV2 24 DEV1 25 MD0 51 RESET 52 NC 3 NC 4 TEST 55 NC...

Page 27: ...RM8125 Service Manual 25 Figure 3 RM8125 Main Board Top Layer Position Mark Diagram ...

Page 28: ...RM8125 Service Manual 26 Figure 4 RM8125 Main Board Top Layer Position Value Diagram ...

Page 29: ...RM8125 Service Manual 27 Figure 5 RM8125 Main Board Bottom Layer Position Mark Diagram ...

Page 30: ...RM8125 Service Manual 28 Figure 6 RM8125 Main Board Bottom Layer Position Value Diagram ...

Page 31: ...9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 GND MD HOOK ME MIC ME PTT NC SB NC GND GND GND 3M RXL P1 POWER P5 P4 L_RST P3 TXL AFIN AFOUT MD2 MD0 P2 L_BLC L_DA L_WR L_RD L_CS 5C 5C CS 1 RD 2 WR 3 DA 4 VSS 5 VDD 6 LED 7 RST 8 NC 9 NC 10 R3 0R R18 0R F1 1812L110PR ...

Page 32: ...RM8125 Service Manual 30 Figure 8 RM8125 Key Board Top Layer Position Mark Diagram ...

Page 33: ...RM8125 Service Manual 31 Figure 9 RM8125 Key Board Top Layer Position Value Diagram ...

Page 34: ...RM8125 Service Manual 32 Figure 10 RM8125 Key Board Bottom Layer Position Mark Diagram ...

Page 35: ...RM8125 Service Manual 33 Figure 11 RM8125 Key Board Bottom Layer Position Value Diagram ...

Page 36: ... ...

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