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Panasonic KX-TC1881B Service Manual

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ORDER NO. KM40103769C1
F11
Telephone Equipment
KX-TC1881B
900MHz Cordless Phone
Black Version
(for U.S.A.)
SPECIFICATIONS
1

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Summary of Contents for Panasonic KX-TC1881B

  • Page 1 ORDER NO. KM40103769C1 Telephone Equipment KX-TC1881B 900MHz Cordless Phone Black Version (for U.S.A.) SPECIFICATIONS...

  • Page 2: Standard Battery Life

    2001 Kyushu Matsushita Electric Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1. STANDARD BATTERY LIFE After your Panasonic battery is fully charged; While in use near the base unit* Up to about 6 hours...

  • Page 3: Location Of Controls

    2. LOCATION OF CONTROLS (Base unit)
  • Page 4 (Handset)
  • Page 5 3. DISPLAY The handset shows you instructions and information on the display. This display prompts are shown below.
  • Page 8 4. CONNECTIONS...
  • Page 9 Note: - USE ONLY WITH Panasonic AC ADAPTOR PQLV1Z. - The AC adaptor must remain connected at all times. (It is normal for the adaptor to feel warm during use.) - If your unit is connected to a PBX which does not support Caller ID...

  • Page 10: Adding Another Phone

    4.1. Adding Another Phone This unit will not function during a power failure. To connect a standard telephone on the same line, use the Panasonic T-adaptor KX-J66.
  • Page 11 5. OPERATIONS 5.1. Making Calls 5.1.1. With the Handset...
  • Page 14 5.1.2. With the Base Unit (DIgital Duplex Speakerphone)

  • Page 16: Answering Calls

    5.2. Answering Calls...
  • Page 17 5.2.1. With the Handset 5.2.2. With the Base Unit...
  • Page 18 6. DISASSEMBLY INSTRUCTIONS...
  • Page 19 Shown in Fig.- To Remove Remove Lower Cabinet Screws (2.6 X 12)..(A) X 5 Main P.C. Board Remove the P.C. Board Antenna Screw (3 X 12)..(B) X 1 Speaker Screws (3 X 8)..(C) X 3 Battery Cover Remove the Battery Cover Rear Cabinet Screws (2.6 X 12)..(D) X 2 Main P.C.
  • Page 20 7. ASSEMBLY INSTRUCTIONS 7.1. Assembly the LCD to P.C. Board (Handset) 7.2. Replace the RF unit...
  • Page 21 For HS Follow this procedure below when replacing HS RF unit. 1. Remove speaker cables of LCD unit on HS main board. And remove LCD unit. 2. Remove solder on six legs of RF unit. 3. Remove solder on all pads of RF unit. 4.

  • Page 22: Troubleshooting Guide

    8. TROUBLESHOOTING GUIDE Below main flow chart shows the basic check procedure, right side each item (8.1. ~ 8.9.) is corresponded to detailed each item from next page.
  • Page 23 8.1. Check Power 8.2. Check Sp-phone Voice Transmission 8.3. Check Sp-phone Voice Reception...

  • Page 24: Check Battery Charge

    8.4. Check Battery Charge...
  • Page 25 Note - CP+/CM-: Refer to Base Unit Reference Drawing. - TP-VBAT: Refer to Handset Reference Drawing. 8.5. Check Link (*1) Refer to "Finding out the Defective Unit”. 8.6. Check the RF Unit 8.6.1. Finding out the Defective Unit Prepare HS JIG (Handset-jig) and BS JIG (Base Unit-jig). Place the HS JIG on the cradle of the base unit for checking, then confirm that they are linked.
  • Page 26 8.6.2.1. Handset-jig (HS JIG) for Base Unit The handset unit jig also uses two modes: TEST SUPER LOW mode and NORMAL POWER mode. These modes alternate when the handset CLEAR button is pressed: (1) NORMAL POWER mode (Stand-By). In this mode the LCD will remain blank. (2) TEST SUPER LOW mode.
  • Page 27 modes alternate when the base unit LOCATOR button is pressed: (1) NORMAL POWER mode, TEST SUPER LOW (red) is OFF. This test simulates the handset is at normal/close distance. The base unit is in NORMAL POWER mode right after the AC adapter has been inserted.
  • Page 28 8.6.3. RF Check Flowchart Each item (1a ~ 5) of RF check Flowchart is corresponded to Check Table for RF Block. Please refer each item one by one.
  • Page 29 (*) Details of confirmation items are following in “Check Table for RF Block”. 8.6.4. Check Table for RF Block Item BS (Base unit) (*1) HS (Handset) (*1) 1. Put “HS JIG” on BS. 1. Put HS on “BS JIG”. 1a. Link Procedure 2.
  • Page 30 Item BS (Base unit) (*1) HS (Handset) (*1) 1. Put RF wire to ANT and ANT_GND (See Base Unit 1. Put RF wire to ANT and ANT_GND (See TX Power Procedure Reference Drawing). Reference Drawing confirmation Connect this wire Marconi or Spectrum Analyzer. 2.
  • Page 31 8.7. Check Handset Voice Transmission...
  • Page 32 NOTE: If you change MIC. Put some bond or hot melt at hole of MIC behind after changing MIC. 8.8. Check Handset Voice Reception...

  • Page 33: Check Call Id

    NOTE: When checking the RF UNIT, Refet to Check the RF Unit. 8.9. Check Call ID...
  • Page 34 9. TEST MODE AND ADJUSTMENT 9.1. Test mode flow chart for Base Unit...

  • Page 35: Test Mode Flow Chart For Handset

    (*1) See Base Unit Reference Drawing. (*2) Special check method for Base Unit individually. 9.2. Test mode flow chart for Handset...

  • Page 36: Base Unit Reference Drawing

    (*1) See Handset Reference Drawing. (*2) Special check method for Handset individually. 9.3. Adjustment X101 IN case of SS system, Carrier signal frequency directly can not be measured by Frequency counter, because sending signal is spread by PN code. So, the confirmation and adjustment is made under the Continuous Send mode of TEST MODE. Adjust the TX carrier (CW) frequency on the RF unit.

  • Page 37: Handset Reference Drawing

    9.5. Handset Reference Drawing 9.6. FREQUENCY TABLE 10. DESCRIPTION 10.1. Frequency The frequency range of 906.00 MHz ~ 923.25 MHz is used. Transmitting and receiving channel between base unit and handset is same frequency. Refer to the Frequency Table. 10.2. Time Division Duplex (TDD) operation Transmission/reception between the base unit and handset is performed by time-sharing as shown in Fig.

  • Page 38: Spread Spectrum

    10.2.1. TDD Frame Format The TDD frame is 2mS in length, and is composed of two symmetrical 960 S TX and RX subframes. Each subframe contains 96 bits of 10 S duration, with 40 S guard times between both TX and RX subframes. Each subframe consists of the following four fields: - A 16-bit Preamble field - An 8-bit Data Channel field...

  • Page 39: Signal Flowchart In The Whole System

    10.4. Signal Flowchart in the Whole System Reception CN101 (LINE 1/2) or CN201 (LINE 2) of the base unit is connected to the TEL line, and the signal is input through the bridge diode D101 (LINE 1), D201 (LINE 2). While talking the relay (Q101 for LINE 1, Q201 for LINE 2) is turned ON and amplified at the amplifiers Q162 and Q164 (LINE 1), IC250, IC251, Q264 (LINE 2), then led to DSP (IC501).
  • Page 40 10.5. EXPLANATION OF BBIC DATA COMMUNICATION 10.5.1. Calling...
  • Page 41 10.5.2. To Terminate Communication 10.5.3. Ringing 10.5.4. ID Change...

  • Page 42: Terminal Guide Of Ic's, Transistors And Diodes

    11. TERMINAL GUIDE OF IC'S, TRANSISTORS AND DIODES 11.1. Base Unit 11.2. Handset...

  • Page 43: Block Diagram (Base Unit)

    12. BLOCK DIAGRAM (Base Unit) 12.1. Power Supply 12.2. DSP Control...

  • Page 44: Circuit Operation (Base Unit)

    13. CIRCUIT OPERATION (Base Unit) 13.1. SP-PHONE RX Circuit 13.1.1. LINE 1 Circuit Operation: Telephone Line Interface Q161 C168 R167 Q162 C171 R171 C173 Q164 R192 C183 pin 51 of IC501 pins 35 and 37 of IC501 Speaker...
  • Page 45 13.1.2. LINE 2 Circuit Operation: Telephone Line Interface Q261 R263 C265 R267 IC250-2 Q262 PC210 C271 IC251-2 C273 R282 C298 Q264 C276 pin 44 of IC501 pins 35 and 37 of IC501 Speaker 13.2. SP-PHONE TX Circuit 13.2.1. LINE 1 Circuit Operation: C425, C426 C418, C419...
  • Page 46 13.2.2. LINE 2 Circuit Operation: C425, C426 C418, C419 pins 60 and 61 of IC501 pin 39 of IC501 R295 C279 R286 R287 R299 IC251-1 Q263 PC210 C270 IC250-1 C268 R268 Q261 Telephone Line...

  • Page 47: Power Supply Circuit

    13.3. Power Supply Circuit Function: Power from the AC adaptor passes through a regulating block consisting of IC301. Circuit Operation: IC301 is a regulated power supply. The voltage at point A is regulated to 4.0V by IC301. The voltage at point B is dropped by D306 and D310 to 3.3V. The voltage at point C is regulated to 5.5V by IC341.
  • Page 48 13.4. DTMF Signal When the DTMF data from the Handset is received, the DTMF signal is output from pin 41 (LINE 1), pin 39 (LINE 2) of IC501 and sent to the line through Q161 (LINE 1), Q261 (LINE 2). 13.5.
  • Page 49 13.5.2. LINE 2 The modulation signal input from the RF unit is demodulated by IC501. The audio signal output from pin 39 of IC501 and is input to telephone Line. Circuit Operation: pin 39 of IC501 R295 C279 R286 R287 pin 7 of IC251 Q263 pin 12 of PC210...

  • Page 50: Calling Line Identification Circuit (Caller Id)

    Circuit Operation: Telephone Line (T/R) Q161 C168 R167 Q162 C171 R171 C173 Q164 R192 C183 pin 51 of IC501 RF UNIT 13.6.2. LINE 2 The audio signal from line passes through IC250, Q262, PC210, IC251 and Q264, and the signal is input to pin 44 of IC501.
  • Page 51 The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone company to utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has been entered for the circuit being used.
  • Page 52 Call Waiting Calling Identity Delivery on Call Waiting (CIDCW) is a CLASS service that allows a customer, while off-hook on an existing call, to receive information about a calling party on a waited call. The transmission of the calling information takes place almost immediately after the customer is alerted to the new call so he/she can use this information to decide whether to take the new call.
  • Page 53 13.8. Parallel Connection Detection Circuit Function: In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone connected in parallel is on hook or off hook by detecting changes in the T/R voltage.
  • Page 54 When off hook Q141, Q142 (LINE 1), Q241, Q242 (LINE 2) is OFF, the voltage is monitored pin 50 (LINE 1) and 43 (LINE 2) of IC501; the presence/absence of a parallel connection is determined when the voltage changes by 0.2 V or more. 13.8.1.

  • Page 55: Telephone Line Interface

    the functions of speech compression. The DSP system is fully controlled by a host processor IC501. The host processor provides activation and control of all that functions, such as Tone detecting and Line monitoring. The DSP system comprises of following. —...
  • Page 56 13.10.2. LINE 2 Circuit Operation: ON HOOK Q201 is open, Q201 is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-hook condition. SPECIFICATIONS In the on-hook state (idle), the current flows between the telephone line and the unit is as follows PO201 L201 C203...
  • Page 57 13.11. Intercom Mode 1. When the base unit LOCATOR/INTERCOM button is pressed, a call monitor signal (intercom sound) is output from pins 35 and 37 of IC501. Thus a monitor tone is heard from the speaker. 2. At the same time, flashing of the IN USE/CHARGE (LED501) is obtained from pin 101 of IC501.

  • Page 58: Block Diagram (Handset)

    14. BLOCK DIAGRAM (Handset) 15. CIRCUIT OPERATION (Handset)

  • Page 59: Charge Circuit

    15.1. Power Supply Circuit Voltage is supplied separately to each block. 15.2. Charge Circuit Ni-Cd battery is connected to CN202. When the handset is put on the cradle of the base unit, the power is supplied from CHARGE1 and CHARGE2 terminals to charge the battery. Q207 detects the voltage of CHARGE1 and CHARGE2 terminals, then the handset makes ID code setting with the base unit.

  • Page 60: Sending Signal

    15.4. Sending Signal The voice signal from the microphone input to pin 42 (CIDIP) and pin 41(CIDIN) of IC201 (DSP). CN203 is the headphone jack. When the headphone is connected, the Q206 detect it. The input from the microphone of the handset (CIDIN, CIDIP) is cut and the microphone signal from the headphone is input to pin 47 of IC201 (HMIN).

  • Page 61: Cpu Data (Base Unit)

    15.5. Reception Signal Circuit The received signal from the base unit is output from pins 33 (SPN) and 32 (SPP) of IC201 (DSP) as the voice signal. SPN is the inverse output of SPP, and the speaker is driven by SPN and SPP.

  • Page 62: Cpu Data (Handset)

    17. CPU DATA (Handset) 17.1. IC201...

  • Page 63: Explanation Of Ic Terminals (Rf Unit)

    18. EXPLANATION OF IC TERMINALS (RF Unit) 18.1. IC101...

  • Page 65: How To Replace Flat Package Ic

    19. HOW TO REPLACE FLAT PACKAGE IC 19.1. Preparation - SOLDER Sparkle Solder 115A-1, 115B-1 or Almit Solder KR-19, KR-19RMA - Soldering iron Recommended power consumption will be between 30 W to 40 W. Temperature of Copper Rod 662 ± 50°F (350 ± 10°C) (An expert may handle between 60 W to 80 W iron, but beginner might damage foil by overheating.)
  • Page 66 - Flux HI115 Specific gravity 0.863 (Original flux will be replaced daily.) 19.2. Procedure 1. Temporary fix FLAT PACKAGE IC by soldering on two marked 2 pins. *Most important matter is accurate setting of IC to the corresponding soldering foil. 2.

  • Page 67: Cabinet And Electrical Parts (Base Unit)

    20. CABINET AND ELECTRICAL PARTS (Base Unit)

  • Page 68: Cabinet And Electrical Parts (Handset)

    21. CABINET AND ELECTRICAL PARTS (Handset)

  • Page 69: Accessories And Packing Materials

    22. ACCESSORIES AND PACKING MATERIALS...

  • Page 70: Replacement Parts List

    23. REPLACEMENT PARTS LIST This replacement parts list are U.S.A. version only. Note: 1. RTL (Retention Time Limited) The marking (RTL) indicates that the Retention Time is limited for this item. After the discontinuation of this assembly in production, the item will continue to be available for a specific period of time.
  • Page 71 *Type & Wattage of Resistor 23.1. Base Unit 23.1.1. CABINET AND ELECTRICAL PARTS Ref. No. Part No. Part Name & Description Remarks PQAS57P03Y SPEAKER PQGB7Y BADGE PQGT14074Z NAME PLATE PQHG10609Z RUBBER SHEET PQHR10753Y LED LENSE PQKM10439W1 UPPER CABINET PQQT22049Z CHARGE LABEL PQSA10095Z ANTENNA PQSX10136Z...
  • Page 72 Ref. No. Part No. Part Name & Description Remarks PCB1 PQWPTC1881BH MAIN P.C.BOARD ASS'Y (RTL) (ICS) IC121 PQVINJM2904V IC141 PQVINJM2904V IC221 PQVINJM2904V IC241 PQVINJM2904V IC250 PQVINJM2904V IC251 PQVINJM2904V IC301 PQVIXCF4002P IC331 PQVIPS3432UT IC332 C0EBD0000129 IC341 PQVIXCF5502P IC501 C2HBBG000017 IC521 PQWITC1881BH (TRANSISTORS) Q101 2SA1972...
  • Page 73 Ref. No. Part No. Part Name & Description Remarks D302 PQVDHRU0302A DIODE(SI) D303 MA8039 DIODE(SI) D306 MA111 DIODE(SI) D307 PQVDRLZ8R2 DIODE(SI) D309 MA111 DIODE(SI) D310 MA111 DIODE(SI) D312 MA111 DIODE(SI) D321 MA8047 DIODE(SI) D340 MA111 DIODE(SI) D360 MA8036H DIODE(SI) D371 MA111 DIODE(SI) D376...
  • Page 74 Ref. No. Part No. Part Name & Description Remarks (THERMISTORS) PO101 PQRPAR390N THERMISTOR PO201 PQRPAR390N THERMISTOR (OTHERS) PQJM147Y MICROPHONE PQMG10023Z CUSHION RUBBER, MIC G601 PQJT10152Z CHARGE TERMINAL G602 PQJT10152Z CHARGE TERMINAL G603 PQJT10152Z CHARGE TERMINAL G604 PQJT10152Z CHARGE TERMINAL G605 PQJT10152Z CHARGE TERMINAL G606...
  • Page 75 Ref. No. Part No. Part Name & Description Remarks R153 ERJ3GEYJ103 R154 ERJ3GEYJ472 4.7k R155 ERJ3GEYJ104 100k R157 ERJ3GEYJ103 R158 ERJ3GEYJ103 R160 ERJ3GEYJ101 R161 ERJ3GEYJ102 R162 ERJ3GEYJ153 R163 ERJ3GEYJ470 R164 ERDS1VJ270 R165 ERJ3GEYJ152 1.5k R166 ERJ3GEYJ122 1.2k R167 ERJ3GEYJ102 R168 ERJ3GEYJ394 390k R169...
  • Page 76 Ref. No. Part No. Part Name & Description Remarks R239 ERJ3GEYJ104 100k R240 ERJ3GEYJ103 R241 PQ4R10XJ825 8.2M R242 PQ4R10XJ825 8.2M R243 ERJ3GEYJ824 820k R244 ERJ3GEYJ824 820k R245 ERJ3GEYJ104 100k R246 ERJ3GEYJ563 R247 ERJ3GEYJ683 R248 ERJ3GEYJ102 R249 ERJ3GEYJ473 R250 ERJ3GEYJ473 R251 ERJ3GEYJ122 1.2k R252...
  • Page 77 Ref. No. Part No. Part Name & Description Remarks R302 ERJ3GEYJ471 R303 ERJ3GEYJ221 R321 ERJ3GEYJ152 1.5k R324 ERJ3GEYJ104 100k R325 ERJ3GEYJ102 R331 ERJ3GEYJ273 R332 ERJ3GEYJ104 100k R333 ERJ3GEYJ223 R334 ERJ3GEYJ104 100k R336 ERJ3GEYJ474 470k R341 ERJ3GEYJ473 R342 ERJ3GEYJ224 220k R343 ERJ3GEY0R00 R344 ERJ3GEYJ563...
  • Page 78 Ref. No. Part No. Part Name & Description Remarks D163 PQ4R10XJ000 D262 PQ4R10XJ000 L371 ERD25VJ0 (CAPACITORS) C101 ECUV2H681KB 680P C102 ECUV2H681KB 680P C103 ECQE2224KF 0.22 C105 ECUV1H470JCV C113 ECEA1CKA100 C121 PSCU2JW101KR 100P C122 PSCU2JW101KR 100P C125 ECUV1C104KBV 0.1 C126 ECUV1C104KBV 0.1 C127 ECEA0JKA221 C129...
  • Page 79 Ref. No. Part No. Part Name & Description Remarks C221 PSCU2JW101KR 100P C222 PSCU2JW101KR 100P C225 ECUV1C104KBV 0.1 C226 ECUV1C104KBV 0.1 C227 ECUV1H471JCV 470P C228 ECEA0JKA221 C229 ECUV1H682KBV 0.0068 C241 ECUV1C104KBV 0.1 C242 ECUV1C104KBV 0.1 C243 ECUV1C104ZFV C244 ECUV1H220JCV C250 ECUV1H471JCV 470P C251...
  • Page 80 Ref. No. Part No. Part Name & Description Remarks C311 ECUV1C104ZFV C315 ECEA0JKA101 C316 ECUV1C104ZFV C317 ECEA0JU102 1000 C318 ECUV1C104ZFV C322 ECEA0JKA331 C324 ECST0JY106 C325 ECUV1C104ZFV C326 ECUV1C104ZFV C333 ECUV1H103KBV 0.01 C334 ECUV1C104KBV 0.1 C341 PQCUV1A105KB 1 C342 ECUV1H102KBV 0.001 C371 ECUV1C104ZFV C391...
  • Page 81 Ref. No. Part No. Part Name & Description Remarks PCB2 PQLP10233Z RF BLOCK 23.2. Handset 23.2.1. CABINET AND ELECTRICAL PARTS Ref. No. Part No. Part Name & Description Remarks PQADGP0831GN LIQUID CRYSTAL DISPLAY PQAX2P06Z SPEAKER PQBC10294X1 NAVIGATOR BUTTON PQGP10165Z1 LCD PANEL PQGT14075Z NAME PLATE PQHG10527Y...
  • Page 82 Ref. No. Part No. Part Name & Description Remarks PCB100 PQWPTC1881BR MAIN P.C.BOARD ASS'Y (RTL) (ICS) IC201 C2HBBH000021 IC202 PQWITC1881BR IC203 PQVIC62FP33M IC204 PQVIXCP3002M IC205 PQVIC61CN32N (TRANSISTORS) Q201 PQVTDTC143E TRANSISTOR(SI) Q202 PQVTDTC143E TRANSISTOR(SI) Q203 PQVTDTA143TU TRANSISTOR(SI) Q204 2SA1797Q TRANSISTOR(SI) Q205 2SD1819A TRANSISTOR(SI) Q206...
  • Page 83 Ref. No. Part No. Part Name & Description Remarks X201 PQVCI4096N3Z CRYSTAL OSCILLATOR (RESISTORS) R201 ERJ3GEYJ331 R202 ERJ3GEYJ331 R203 ERJ3GEYJ331 R204 ERJ3GEYJ331 R205 ERJ3GEYJ101 R206 ERJ3GEYJ101 R207 ERJ3GEYJ101 R209 ERJ3GEYJ104 100k R210 ERJ3GEYJ104 100k R211 ERJ3GEYJ104 100k R212 ERJ3GEYJ101 R213 ERJ3GEYJ101 R217 ERJ3GEYF434...
  • Page 84 Ref. No. Part No. Part Name & Description Remarks C205 ECUV1H101JCV 100P C206 ECUV1C104KBV 0.1 C207 ECUV1C104KBV 0.1 C208 ECUV1C104KBV 0.1 C209 ECUV1C104KBV 0.1 C210 ECUV1C104KBV 0.1 C211 ECUV1A474KBV 0.47 C212 ECUV1A474KBV 0.47 C213 ECEV1AA221 C214 ECUV1H103KBV 0.01 C215 ECUV1A474KBV 0.47 C217 ECUV1C104ZFV C218...

  • Page 85: For Schematic Diagram

    Ref. No. Part No. Part Name & Description Remarks PCB200 PQLP10233Z RF BLOCK 23.2.4. ACCESSORIES AND PACKING MATERIALS Ref. No. Part No. Part Name & Description Remarks PQLV1Z AC ADAPTOR PQJA10075Z TEL CORD PQKE10097Z1 HANDSET HOLDER PQKE10098Z1 BELT CLIP PQKL10035Z1 WALL MOUNT PQHG10592Z CUSHION RUBBER...
  • Page 86 25. CIRCUIT BOARD (RF Unit) 26. SCHEMATIC DIAGRAM (RF Unit) 27. CIRCUIT BOARD (Base Unit) 27.1. Component View 27.2. Flow Solder Side View 28. SCHEMATIC DIAGRAM (Base Unit) 29. CIRCUIT BOARD (Handset) 30. SCHEMATIC DIAGRAM (Handset) M / KXTC1881B / Printed in Japan...
  • Page 87 11 TX-ADPCMI 12 RX-ADPCMO Input 1.1kHz 18mVp-p (-45dBm/600 ) 2.4V (Headset) 140mVp-p Input 1.1kHz 0.45V -43dBm/600 3.0V 90mVp-p (Headset) 0.01u 130mVp-p C294 0.01u IC201 270mVp-p Loud Vol. Mid 490mVp-p IC205 3.3V IC203 3.0V IC202 IC204 * "NC" is the part not used.
  • Page 88 VC101 ANT GND...
  • Page 89 TEST 10ch 1ch...
  • Page 90 LINE2 Tx LINE2 Rx 1' LINE2 Rx 2 LINE2 Tx 1 NOTE The check points described by 1 ~ 14 are corresponded to the same marks in circuit diagram. E C B Please refer to the wave form and voltage from circuit diagram. B C E R374 D221...
  • Page 91 TP_VCC2 14 3.15V LINE1 LINE1 5.5V 4.1V IC341 IC301 6.0V...
  • Page 92 6 3.7V 1 7.1V TALK: ( ) IC332 13 3.2V 4 4.1V 3 6V IC301 2 6.1V IC331 5.5V IC341 4.4V 8 3.3V 5 8.8V IC701 30mVp-p (25mVp-p) 280mVp-p (260mVp-p) LINE1/LINE2 IC501 140mVp-p (150mVp-p) 800mVp-p (820mVp-p) 30mVp-p IC141 180mVp-p (45mVp-p) (200mVp-p) IC121 130mVp-p (120mVp-p)
  • Page 93 HANDSET (COMPONENT VIEW) ANT GND VC101 TEST PULL UP...
  • Page 94 VC101 C106 C104 X101 TX_ADPCMI R107 R127 C124 C118 RX_ADPCMO C125 C119 R121 PCM_SYNC R129 C111 C126 PCM_BCLK R130 C107 R110 C127 R111 C128 C101 F102 R113 R131 IC101 T101 L107 R114 C130 OPEN C102 R116 (MCU CLK) SPI_ALE OPEN C103 C131 C116...
  • Page 95 IC101...
  • Page 96 11 TX-ADPCMI 12 RX-ADPCMO 4 Heddset 90mVp_p 5 SPEAKER 270mVp_p 3 Pin 48 of IC201 140mVp_p Loud Vol. Mid 8 TP_Vcc 3.3V IC203 IC205 1 INPUT IC201 1.1kHz IC202 18mVp_p (-45dbm/600 IC204 9 TP_VRF 7 Pin 32 and 33 of IC201 6 Pin 43 of IC201 10 DPS VDD 3.0V...

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