Panasonic KX-TG8421FXB Service Manual

Contents

53KX-TG8421FXB/KX-TG8421FXN/KX-TGA840FXB/KX-TGA840FXN(F)* Battery Monitor Check - 1. Apply 2.25 V between BATT+ and BATT-.2. Execute the commandsendchar PADsendchar LED 0sendchar CRX 0 1sendchar AD1It assumes that the return value is XX.a) 6c XX 71: No need to adjustb) XX: 6A ~ 6B: Need to adjustXX: 72 ~ 74: Need to adjustWrite AD value of 2.25 V to EEPROM.ex) read data: XX = 6A, write data: YY = 6Aread data: XX = 73, write data: YY = 73EEPROM = 0004(Low Voltage) write “YY”Execute the command “wreeprom 00 04 01 YY”.EEPROM = 0005(No Voltage) write ‘’YY - 1D’’Execute the command “×wreeprom 00 05 01 ZZ”.EEPROM = 000A(Low Voltage BL) write “YY - 16”Execute the command “wreeprom 00 0A 01 WW”.Note:ZZ = YY - CNo Voltage writing data limit is ‘00’.c) XX: 00 ~ 69: RejectXX: 75 ~ FF: RejectIC1, F1, C1,R12, R45(G) Battery Low Confirma-tion- 1. Apply 2.40 V between BATT+ and BATT-.2. Confirm that there is no flashing of Battery Icon.3. Apply 2.25 V ± 0.08 V between BATT+ and BATT-.4. Confirm that there is flashing of Battery Icon.IC1, F1, C1,R12, R45(H)* BBIC Clock Adjustment CLK 1. Apply 2.6 V between BATT+ and BATT- with DC power.2. Input Command “sendchar sfr”, then you can confirm the current value.3. Check X’tal Frequency. (10.368 MHz ± 100 Hz).4. If the frequency is not 10.368 MHz ± 100 Hz, adjust the frequency of CLK exe-cuting the command “sendchar sfr xx xx (where xx is the value)” so that thereading of the frequency counter is 10.368000 MHz ± 5 Hz.Note:Clear the registered information for Base Unit before measurement, because theFrequency will not possibly get stable due to the registered information.Pressing the button of “3” “7” “9” “#” clears the registration.Register to it on Base Unit after measurement.IC1, X1, C47(I)* Transmitted Power Con-firmation- Remove the Antenna before starting step from 1 to 4.1. Configure the DECT tester (CMD60) as follows;• Test mode: PP• RFPI: 0102030405• Traffic Carrier: 5• Traffic Slot: 4• Mode: Loopback• RF LEVEL = -70 dBm• PACKET: PP32Z2. Execute the command “sendchar TST 01 02 03 04 05".3. Initiate connection from DECT tester.4. Confirm that the NTP value at ANT is 19 dBm ~ 25 dBm.IC1,C802~C806,C808~C814,C819~C820,C822,C825~C827,C834,C859~C864,L801~L804,DA801,R801~R808(J)* Modulation Check andAdjustment- Follow steps 1 to 3 of (K).4.Confirm that the B-Field Modulation is -370±30/ +370±30 kHz/div & Modulatedwidth 690 kHz using data type Fig 31.IC1,C802~C806,C808~C814,C819~C820,C822,C825~C827,C834,C859~C864,L801~L804,DA801,R801~R808Items CheckPointProcedure Check orReplace Parts