ISSUE 11 Oct, Hytera Customer Service Express

Transcription

1 ISSUE 11 Oct, Hytera Customer Service Express

2 CONTENTS 02 Welcome to become a Hytera authorized Overseas Repairing Technician 03 A Typical Case of TM-610 Repair (Replace CPU) 05 Troubleshooting of PD78X Power on Without Alert Tone and No Voice Output 07 A Typical Repair Case of PD78X No Voice 09 A Typical Repair Case of RD98X cannot Read/Write Data 12 RD98X Can't Realize IP Multi-Site Connection Repair Case 15 TM800 No Voice Output Detection 18 TC610 RX No Voice Output Detection 20 TM610 Cannot Power On Repair Case 1

3 News and Events Welcome to become a Hytera Authorized Repairing Technician The new policy of How to distribute the Hytera Authorized Repairing Technician Certificate is effective from 2012/10/08. The policy is applicable to all the distributors of Hytera. This policy is to standardize the distribution process of the Hytera Authorized Repairing Technician Certificate, specify the responsibilities of the Hytera repairing technician and provide them with professional guidelines. Of course, it tells you how toget and how to update the Hytera Authorized Repairing Technician Certificate. There are two workflows in the policy to show you the details. This policy has categorized the Hytera authorized repairing technician into three levels (junior, intermediate, senior) with different requirements for professionals which are based on relevant working experience, theory test score and practical repairing score. For instance, the certification criteria for an authorized intermediate repairing technician: minimum 3 yearsradiorepairing experience, theory test score over 80 points (total 100 points), practical repairing score over 80 points (total 100 points). Kindly reminder to who is likely to become a Hytera authorized repairing technician, the technician qualification requirements: the applicants must serve the aftersales service station in full time. the applicants must pass the test for the Hytera authorized Overseas Repairing Technician Why become a Hytera Authorized Repairing Technician? Here are the answers: Only the Hytera authorized repairing technician is recognized as a professional for repairing Hytera products. Only the Hytera authorized repairing technician is qualified for serving Hytera after sales service station in full time. The Hytera authorized repairing technician will be offered with profounder technical support and targeted training from Hytera than the unauthorized technician. Here is asneak preview of the workflow of how to get the Hytera Authorized Repairing Technician Certificate. Please be noted that the application shall be started with handing in an application form by applicants. You may send requests to overseas.service@hytera.com to get application forms. The workflow of how to get the Hytera Authorized Repairing Technician Certificate V Overseas customers Start 010 Hand in application 040 Take training and test 070 Accept certificate End 002 Overseas Service Manager 020 Application verification N End Y 030 Arrange training,test N 050 Evaluation Y 060 Award certificate For more details about the new policy, please don t hesitate to make a call to or send s to overseas.service@hytera.com. 2

4 A Typical Case of TM-610 Repair (Replace CPU) 1. The description of faulty phenomenon The radio cannot be powered on. When connect to the power supply, the screen is turn on orange, but not character is displayed, push the buttons the radio doesn t have any reaction. And we can t power off this radio through buttons. 2. Faulty reason This problem might be caused by the power-supply circuit and the control circuit. We need to check the power-supply circuit first. 3. Typical Case Model Frequency Band Firmware Version TM MHz/ MHz V Repair Steps 1) Open the radio, found some components are burned. Replace the broken burned components L506/L534. Please pay attention the copper foil, if it is burned, you might need to reconnect it. 2) Check the power-supply circuit, if the power-supply circuit is OK, the normal voltage of different parts as below: 3

5 3) If the power-supply circuit is OK, we need to check the control circuit. The control circuit includes CPU(IC520), Crystal (X501),Storage IC(IC501), and the watch dog circuit. First check the Crystal (X501) to see if there is a 0.2V voltage difference between the Crystal (X501) input and output. If yes, the CPU might be damaged. Replace the CPU to see if we can fix this problem or not. (The CPU is provided by Hytera Global Customer Service Center, the correct software of CPU is already burned by Hytera.) 4) According to our repairing experience, the storage IC(IC501) and the watch dog circuit is not easy to be damaged. 5. Summary Normally this kind of problem is because the CPU is burned. Please be very careful when you replace the CPU, make sure there is no faulty soldered joints. 4

6 Troubleshooting of PD78X Power on Without Alert Tone and No Voice Output 1. Fault Description PD78X radio power on without alert tone and no voice output 2. Analysis 1) From the fault phenomenon, we can see this is a radio audio failure. 2) The main reason to cause this audio failure is audio circuit problem or speaker problem. 3. Typical Maintenance Case Radio Type Frequency Range Firmware Version PD MHz V Case No.1: Fault Phenomenon This PD780 could power on normally, but without alert tone, and no voice output when it is receiving signal. Fault Analysis The audio failure is mainly caused by the audio circuit problem or speaker, FFC problem. Detecting Steps (Refer the figure 1, figure 2) 1) Disassemble and remove the front case, use Digital Multimeter to test the speaker. The speaker is OK after testing. Remove the rubber and use Digital Multimeter to test speaker. 2) Check the audio amplifier IC, test if there is audio signal input and send to speaker. 5

7 The audio amplifier IC is U801, the above picture is the PCB board, the corresponding circuit refer the below picture. The signal input end of audio amplifier Description: Use RF Test equipment to detect there have signal output from audio amplifier IC and audio processing IC, TP1, TP2 have signal output, it means the speaker is OK. The test point of audioamplifier output to speaker 3) As the speaker is OK, the FFC is suspected to damage, the problem is solved after replacing the front case. Summary The kind of audio problem is mainly caused by FFC of speaker, the audio processing IC is hard to damage as it has high level of integration. 6

8 A Typical Repair Case of PD78X No Voice 1. The description of this problem Connect battery of PD78X and turn on the radio, when press PTT the red indicator on, the other radios in the same group s indication is green, but cannot hear any voice. 2. The analysis 1) This problem may be caused by CTCSS/CDSS, signaling or squelch level, we don t consider these software settings here. 2) If this problem is caused by the hardware, we need to check MIC/ EMI filter/voltage bias circuit/the bus and connect circuit/audio codec circuit and the CPU. 3. A Typical Case Model Frequency Firmware Version PD MHz V ) Fault Phenomenon Connect battery of PD78X and turn on the radio, when press PTT the red indicator on, the other radios in the same group s indicator is green, but cannot hear any voice. 2) The Repairing process(with HP 8921A analyzer) a) Connect the PD780 to analyzer with the RF cable and audio cable(analyzer Audio Input port), switch to Tx Test mode on HP8921A, set AFGen1 1KHz, AF GEN1 Lvl 50mV. Connect battery and turn on PD780, press PTT. We found the Tx frequency and Power on the analyzer is normal, but the FM deviation and AF Freq is not OK. (Normally, FM deviation is around 4.5KHz, AF Freq is 1KHz). b) Use probe to connect Audio Input port of HP8921A, and put probe on C1012, now the FM Deviation and AF Frequency specifications become normal. c) Press PTT to transmit, and put probe on C1003, we found FM Deviation and AF Frequency specifications is faulty again. d) Press PTT to transmit, use multimeter to test the MIC pin 1& pin 2 s voltage, it is 0.2 and 0.5V. The voltage difference is =1.5V, we think maybe U1001 is broken. e) Replace U1001, repeater step c) now FM Deviation and AF Frequency specifications are OK, problem solved. 3) Summary This problem is caused by EMI Filter U

9 2 M 0 EMI 8

10 A Typical Repair Case of RD98X cannot Read/Write Data 1. The description of this problem 1) When connect RD98X with power and programing cable, read the repeater, the CPS can show the correct USB port number, but cannot read/write data, mentioned wrong connection or wrong model. 2) When connect RD98X with power and programing cable, read the repeater, the CPS cannot show the correct USB port number. 2. The analysis 1) If the CPS can show the USB port correctly, it is may be caused by the mismatch between the CPS and your radio. a) This problem may be caused by incorrect CPS version. The CPS have one to one relationship with your radio. VX.XX.XX.XXX EM5- For PD785(G)/PD705(G)/MD785/RD985 VX.XX.XX.XXX AS8- For PD788(G)/PD708(G)/MD788/RD988 VX.XX.XX.XXX NA2- For PD782(G)/PD702(G)/MD782/RD982 VX.XX.XX.XXX SA6- For PD786(G)/PD706(G)/MD786/RD986 b) Low version of CPS cannot read/write high version RD98X. 2) If the CPS cannot show the USB port, it may because a) The USB driver is not installed correctly or have problems. Please reinstall the USB driver. b) Hardware problem: OMAP/Display board ESD protection diode, baseband board ESD protection diode/ Serial to parallel transfer IC. 3. Typical Case Model Frequency Firmware Version RD MHz R ) Fault Phenomenon When connect RD98X with power and programing cable, read the repeater, the CPS cannot show the correct USB port number. 2) Analysis Check software problem first, then hardware problem. 9

11 3) The Repairing process a) Exclude software first. b) Test TP106&TP107 s resistance(refer following photo),between K, means OMAP works normally. c) Use multimeter to test the ESD protection diode of front panel accessory jack, and the ESD protection diode D708. We found U8 is shortened. d) Replace the U8 diode, problem is solved. 10

12 4)Summary The problem is caused by ESD protection diode; it is shortened so we cannot read/write data. This protection diode s function is to protect OMAP circuit from strong signal s interference. 11

13 RD98X Can't Realize IP Multi-Site Connection Repair Case 1. Fault phenomenon description RD98X IP multi-site connection can t realize communication, there isn t any response when we use RDAC software to test and it can t connect with each other. 2. Fault phenomenon reason analysis 1) We judge the radio has a fault of not realizing IP multi-site connection according to the fault phenomenon as above. 2) The main reasons for software fault are as followed: wrong Ethernet IP address and authentication code, IP internet UDP port, IP internet service,remote repeater diagnosis and control doesn t open. 3) The main circuit causing hardware fault is Ethernet chip circuit. 3. Specific maintenance case Case 1 Radio Type Frequency Band Firmware Version RD98X MHZ R Fault Phenomenon RD98X IP multi-site connection can t realize communication; there is no response when we use RDAC software to do the test. Fault Analysis It is belonged to the fault of not able to realize the IP-multi site connection according to fault description. Test Step 1) Firstly, we need to exclude the software fault, the CPS setting of RD98X is as figure 1; 2) Use RDAC software to do the diagnostic analysis. 3) It will appear figure 3 if the 2 point setting as above. If the CPS setting and RDAC software are normal, but it doesn t show the figure 3 which means radio is not normal, it may have fault. 4) We can exclude the software fault according to the fault description as above, then we focus our attention to check Ethernet chip circuit. 5) Use multimeter to check and test resistance value of TX and RX circuit as figure 4 shows, it is 0 ohm, then we need to replace Ethernet chip. It returns to normal condition after we use RDAC software to test, the fault is eliminated. 12

14 Figure 2 13

15 Summarization This fault is because that TX and RX circuit is short circuit and then burn the ethernet chip. 14

16 TM800 No Voice Output Detection 1. Fault phenomenon 1) Turn on the radio, no power on voice output, screen display normal, press PF1 monitor key, no voice output from speaker. 2) Turn on the radio, there is power on voice output, press monitor key, speaker makes out zhizhi sound, no voice output when talk. 3) Turn on the radio, no power on voice output, the voice output is normal when talk. 2. Cause Analyze 1)Cause 1: a. According to phenomenon 1, the cause is no output from audio amplifier. This could be caused by audio amplifier problem. b. In receiving status, audio amplifier has output with slight heat. It could be the malfunction of speaker. 2)Cause 2: According to phenomenon 2, we can judge that the audio amplifier and speaker are normal. The malfunction may happen in receiving IF and modulating. 4) Cause 3 According to phenomenon 3, the voice output is normal when talk, but no power on voice. Because the power on voice is sent out by CPU, and then pass to speaker by amplifier, the malfunction should happen in the circuit which is between CPU output and audio amplifier. 3. Typical Maintenance Case Case 1. Model Frequency Range Firmware Version TM-800U MHz z V Fault phenomenon Turn on the radio, no power on voice, screen display normal, press PF1 monitor key, no voice output from speaker. Cause analyze Pilot analyze by fault phenomenon, the reason of no voice output from audio amplifier could be the audio amplifier is malfunction. In receiving status, the audio amplifier has output but with slight heat means the audio amplifier works normally. The problem could be in the circuit which is between audio amplifier and speaker. Detection steps(fig 1., Fig 2.) 1) Step 1: Exclude the malfunction of speaker, at first, check whether the cable which connects host J504 to PCB J502 is normal or not; Second, check whether the current limit R518, R519 are normal; Continue to Step 2 if the mentioned parts are normal. 15

17 2) Step2: Check whether audio amplifier TDA1554/TDA8561 is in receiving status or not, maximize the volume, amplifier is working, if the amplifier is totally without heat, meaning the amplifier is not working. Check the amplifier power supply voltage is 13.8V. If the amplifier is with slight heat, the malfunction should be in the circuit between amplifier output and speaker. If the amplifier is with serious heat, it means short circuit happens in the circuit of amplifier output. Then we should only exclude short circuit problem. 3) Step 3: In receiving status, the amplifier front audio signal is about 80MV, output is normal, change audio amplifier IC. Fig 1 Fig 2 16

18 Conclusion According to above analysis, there are three causes that will cause radio power on without voice: Audio power amplifier TDA1554/TDA8561 malfunction, current limit resistor puncture, speaker malfunction. Case 2 Model Frequency Range Firmware Version TM M V Fault phenomenon Turn on the radio, there is power on voice output, press monitor key, speaker makes out zhizhi sound, no voice output when talk. Cause Analyze According to fault phenomenon, we can judge that the audio amplifier and speaker are normal. The malfunction may happen in receiving IF and modulating. Detection Steps (Fig. 3) 1) Step 1: check audio signal output of IFO test point, the output range is normal, between 50MV-70MV, we suspect it is IF TDA31136 broken. 2) Step 2: Adjust L135, the voice is merely changed, voice is small and can t be adjusted. Then change L135. 3) Step 3: Check filter L104, use tweezers to touch it, the voice is changed and the voice is seriously distorted. Also shasha sound comes out. We suspect the filter is broken. Then change the filter. 4) Step 4: Under the condition that all the above circuits are normal, but with small voice and no receiving sound, it should be electronic volume control problem. Check the pin of the audio signal of IC125 M62364, at the 4th pin, 300VM is normal; at the 14 th pin, 300VM is normal, if there is no output, then change IC125, the problem is solved. Conclusion The above fault is mainly cause by malfunction of ceramic filter L104. Receiving no voice output is mainly caused by malfunction of L

19 TC610 RX No Voice Output Detection 1. Fault phenomenon Power on the radio, there is power on voice, LED indicator turns green when receiving, no receiving voice. 2. Cause Analyze The radio has power on voice, means the audio amplifier circuit and speaker work normally; the indicator turns green when receiving means the radio can receive matched carrier, we can judge the fault is RX no voice output. Besides the fault of software configuration such as signal not matched, the problem should mainly be in the baseband processing circuit. The components are involved in: Modem 50C24, baseband processing IC AN Typical Maintenance Case Case 1. Model Frequency Range Firmware Version TC MHz V Fault phenomenon Turn on the radio, there is power on voice; the indicator turns green when receiving, but no receiving voice output. Cause analyze There is power on voice meaning the audio amplifier circuit and speaker is normal. At first we can check RX no voice whether is caused by software configuration fault. Then we can check IF receiving modulation circuit and audio processing circuit. Read the frequency for the radio, the current signal channel information is as follows: RX and TX frequency are both MHz; channel spacing is 25KHz, no CTCSS/CDCSS. Now we can exclude the cause as of soft configuration fault that conducts RX no voice. We need to dissemble the radio. Detection steps(fig 1., Fig 2.) 1) Dissemble the PCB from the radio, connect speaker to it. Use Comprehensive test instrument to output receiving signal, output frequency as of Mhz, -80dBm, audio modulating frequency 1KHz, frequency deviation 3KHz. Have the antenna port to receive the signal. Now we see the indicator turns green, but the speaker no receiving voice output. 2) Use a multimeter to test the voltage of modulator; it is 2.8V (Normally it is 2.8-3V). 3) Use a multimeter to test the baseband ICU200 Pin 1, voltage is 5V, normal. 4) Test baseband IC U200 Pin#29 no signal output, abnormal. Pin 29 is the audio frequency output of IF modulation IC U200. Normally there must be 250mv audio frequency signal output. We suspect U200 is bad. 5) Change the baseband ICU200 (AN29160), test baseband IC29160 Pin#29 has 250mv signal output. Maximize the volume, the speaker output normal receiving voice. Problem solved. 18

20 Conclusion The fault as of no receiving voice output is caused by damage of baseband IC U200 (AN29160). Fig 1 Fig 2 19

21 TM610 Cannot Power On Repair Case 1. Fault Phenomenon Symptom: After connecting the power supply, turn on the radio, no voice, no display. 2. Cause Analyze From the phenomenon, we could judge that the radio can t power on. There are two circuits will cause the power on failure: power supply circuit, OMAP circuit. The main components are power on key, 19.2Mhz crystal oscillation, reset IC, voltage regulation IC. 3. Typical Maintenance Case Model Frequency Host Version MD MHz R Fault Phenomenon After supply the radio with DC, no power on voice, no response when press PTT and no current. Fault Analysis From the fault phenomenon, there is no current indication after power on radio with DC, we can judge it is power supply circuit problem fail to power on radio. Detection procedure (Fig 1, Fig 2 1) Power on the radio after add power, test U902 output voltage is 5V, normal; 2) Test U900 3V3D voltage output, is 3.3V, normal; 3) Test U901 3V3DP voltage output, is 3.3V, normal; 4) Test U903 1V8D voltage output, is 1.8V, normal; 5) Test U919 1V6D voltage output, is 0V, abnormal; The output voltage should be 1.6v under normal circumstance. We suspect U919 is damaged. 6) Replace U919, 1V6D voltage output is 1.6V, normal, the radio can be powered on normally. Conclusion The failure of power on is due to OMAP power supply abnormal caused by U919(1V6D) damage. 201

22 Fig 1 Fig

23 Hytera Customer Service Express Issue11/Oct Address: Hytera Tower, Shenzhen Hi-Tech Industrial Part North, Beihuan RD., Nanshan District, Shezhen, P.R. C Service Hotline: overseas.service@hytera.com EDITORIAL Editors-in-Chief:Li Yong Executive Editor: Patrick Ren Editor: Angelia Yong Publication Hytera Communications Corporation Limited 3

24 Hytera Customer Service Express 4