SERVICE MANUAL Canadian Model SPECIFICATIONS CORDLESS TELEPHONE MICROFILM
SECTION DIAGRAMS -. BLOCK DIAGRAM BASE UNIT Section ANT (ANTENNA) 2MHz B.P.F. F2 RF Q2 2.2MHz SAW F MIX, OSC, LIMITER, DET U MIX A MIXER LOCAL OSC LO 2 L2 0.7MHz F 0.7MHz LIM LIMITER DEM TANK C QUAD-VOLTAGE LIM F4 LIM2 DEM 0.7MHz LIMITER DE- 22 20 MODULATOR 0 U (/4) U (2/4) 2 FIL2 FIL2 DE- EMPHASIS 2 PRE PRE COMPRESSOR, EXPANDER, NOISE GATE U4 EXPANDER EXP 20 R40 DEMOD AUDIO LEVEL RO RO RO2 RO 8 RO2 7 0MHz B.P.F. F TX Q RX VCO Q TX VCO Q8 CARRIER DETECT Q, 4 FIL FIL 4 DATA/AUDIO ADDER U (4/4) R MOD DEVIATION PRE EMPHASIS COMP 2 EXP COMPRESSOR COMP MIC MIC 8 4 CP2 PLL U0 RX SYSTEM PLL F2 CAR-DET RX DATA 2 TX DATA 24 CP TX SYSTEM PLL F DTMF DTMF 8 DTMF U (/4) CONTROL REFEREE DIVIDER SYSTEM CONTROLLER U DATA CK STB 7 8 X OSC Q0 C TX FREQUEY X 4MHz 2 27 OSC2 OSC D LE LED DRIVE Q T LE TRANSFORMER HOOK ON/OFF U D D2 D 4 RECT D D4 J LE 0 2 PLL EN EEP/PLL CLK EEP/PLL DATA EEP DI EEP CS OFF HOOK 7 RGER DET 20 RGER DETECT U2 2 4 ATE 2 ATE DI CLK DO CS EEPROM U7 CRADLE DET D2 CHARGE CRADLE/CHARGE DETECT Q, 7 CHARGE TERMAL SIGNAL PATH : RX : TX : BELL S DIAL MODE TONE PULSE S HANDSET LOCATOR 22 TONE/PULSE 2 PAGE TX ENABLE RESET V REG B (RX PWR B) TX PWR B RESET SIGNAL GENERATOR Q8, B SWITCH (FOR TX SYSTEM) Q V REGULATOR U J2 DC V 0 2
-2. BLOCK DIAGRAM HANDSET Section ANT2 (ANTENNA) 0MHz B.P.F. F RF Q2 0.MHz SAW F MIX, OSC, LIMITER, DET U MIX A MIXER LOCAL OSC LO L2 0.7MHz F4 0.7MHz LIM LIMITER DEM TANK C2 QUAD-VOLTAGE LIM F LIM2 DEM 0.7MHz LIMITER DE- 22 20 MODULATOR U (4/4) U (2/4) 2 FIL2 FIL2 DE- EMPHASIS 2 PRE PRE COMPRESSOR, EXPANDER, NOISE GATE U7 EXPANDER EXP 20 R DEMOD AUDIO LEVEL S VOL RO RO RO 8 L (LOW) M (MEDIUM) H (HIGH) RO2 RO2 7 U8 (SPEAKER) 2 0 2MHz B.P.F. F2 TX Q TX VCO Q FIL FIL 4 DATA/AUDIO ADDER U (/4) PRE EMPHASIS COMP COMPRESSOR MIC MIC NF 0 U (MIC) RX VCO Q8 Q R MOD DEVIATION 2 EXP COMP 4 CP2 PLL U RX SYSTEM PLL F2 RX DATA 2 TX DATA 24 CP TX SYSTEM PLL F SYSTEM CONTROLLER U BEEP 20 BUZZER DRIVE Q4, 7 U4 (BUZZER) CONTROL REFEREE DIVIDER LIGHT LED 8 LED DRIVE Q2 D 4 (KEY BACK LIGHT) DATA CK STB 7 8 X OSC Q2 C2 TX FREQUEY 2 OSC2 TALK/BATT LED ATE 7 2 D TALK/BATT LOW B (MCU PWR) ATE X 4MHz 27 OSC CRADLE DET 2 CRADLE DETECT Q CHARGE TERMAL 2 PLL EN PLL CLK PLL DATA REGULATOR, RESET SIGNAL GENERATOR, BATTERY DETECT U D7 S S8 KEY MATRIX (SEET KEY) 0 7 ROW ROW4 COL0 COL TX ENABLE RX ENABLE MCU PWR B V-ANA PWR B TX PWR B RX PWR B B SWITCH (FOR ANALOG SYSTEM) Q8 B SWITCH (FOR TX SYSTEM) Q B SWITCH (FOR RX SYSTEM) Q 4 0 PUT FEED BACK ERROR COMP ERROR DROP DETECT AUXILLARY REGULATOR SHUT DOWM.2V PUT SHUT DOWN COMP RECHARGEABLE BATTERY PACK (BP-T2) SIGNAL PATH : RX : TX : BELL IRQ 2 RESET LOW BATT 22 Q20 WATCH DOG TIMER U (/4) SWITCHG Q 0 0 4
-4. PRTED WIRG BOARDS BASE UNIT Section 7 8
-. SCHEMATIC DIAGRAM BASE RF Board See page 2 for IC Block Diagrams. (Page 2) 20
-. SCHEMATIC DIAGRAM BASE MA/BASE KEY Boards See page for Waveform. See page 0 for IC Block Diagrams. (Page 20) 2 22
-7. SCHEMATIC DIAGRAM HAND RF Board See page 2 for IC Block Diagrams. (Page 2) 2 24
-8. SCHEMATIC DIAGRAM HAND MA Board See page for Waveform. See page 0 for IC Block Diagrams. (Page 24) 2 2
-. PRTED WIRG BOARDS HANDSET Section Semiconductor Location Ref. No. Location D D-0 D * D-4 D2 E-0 D2 * D- D D- D * D- D4 E- D B-7 D G- D7 G- D8 E- D4 G- Q E- Q * D- Q2 D-7 Q2 * C-2 Q * D- Q8 * D-2 Q2 C- Q B- Q4 F-7 Q G- Q B- Q7 F-7 Q8 F-7 Q D- Q20 D- U * H-2 U D- U * C- U E- U7 C- U F- Note: no mark: Mounted on the HAND MA board. * : Mounted on the HAND RF board. 27 28
IC Block Diagrams U U27B-AFSG (BASE RF Board) U U27B-AFSG (HAND RF Board) VCC2 LO REF LO 2 VCC LIM LIM2 LIM2 REF 4 DEM NTANK DEM TANK DEM 28 27 2 2 24 2 22 2 20 8 7 LOCAL OSC LIMITER DE- MODULATOR MIX VCC/2 LIMITER SLICER A 2 4 7 8 0 2 4 A REF A MIX VCC MIX N LIM REF LIM DATA COM N COM SL U2 TB202BFN-EL (HAND RF Board) U0 TB202BFN-EL (BASE RF Board) 4 2 0 /2 PHASE PUT SWITCH L. OSC BUF 2, BUF PROGRAMABLE DIVIDER /2 REFEREE DIVIDER 2, BUF PROGRAMABLE DIVIDER /2 PHASE PUT LOCK DET CONTROL 2 4 7 8 F VCC CP LD CK DATA STB F2 VCC CP2 SW X X BO 2
U4 TA0F (BASE MA Board) U7 TA0F (HAND MA Board) VCC PRE NF PRE E-RECT EXP R RO RO2 COMP EXP THROUG 24 2 22 2 20 8 7 4 G PRE THROUGH EXP SUM RO RO2 SWITCH CONTROL THROUG 2 2 COMP SUM MIC G 2 4 7 8 0 2 FIL2 FIL2 FIL FIL COMP 2 C-RECT C-NF MIC MIC NF MIC U7 BRLC4F-E2 (BASE MA Board) U LP2IM (HAND MA Board) CS CLK DI DO 2 4 COMMAND DECODE CONTROL, CLOCK GENERATION COMMAND REGISTER DUMMY BIT ADDRESS DATA REGISTER POWER SUPPLY VOLTAGE DETECTION WRITG HIBIT BIT BIT HIGH VOLTAGE GENERATION ADDRESS DECODER R/W BIT BIT,024 BIT EEPROM ARRAY 8 7 VCC VSS PUT SENSE SHUT DOWN ERROR 2 4 ERROR SHUT DOWN DROP DETECTION PUT 4 FEEDBACK V TAP 7 8 AUXILLARY 2.2V COMP 0 COMP 0