SONY-SPP-A941

(1)

SERVICE MANUAL ^{US Model}

Canadian Model

SPECIFICATIONS

SPP-A941

Ver 1.1 1999. 11

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SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY.

TABLE OF CONTENTS 1. GENERAL

Identifying the Parts ... 3

Setting Up the Base Unit ... 4

Preparing the Battery Pack ... 4

Making Calls ... 5

Receiving Calls ... 5

2. DISASSEMBLY

... 11

3. TEST MODE

... 13

4. ELECTRICAL ADJUSTMENTS

Base Unit ... 14

Handset ... 16

5. DIAGRAMS

5-1. Block Diagram – BASE UNIT Section (1/2) – ... 17

5-2. Block Diagram – BASE UNIT Section (2/2) – ... 19

5-3. Block Diagram – HANDSET Section – ... 21

5-4. Note for Printed Wiring Boards and Schematic Diagrams ... 23

5-5. Printed Wiring Board – BASE RF Board – ... 23

5-6. Schematic Diagram – BASE RF Board – ... 25

5-7. Printed Wiring Board – BASE MAIN Board – ... 27

5-8. Schematic Diagram – BASE MAIN Board – ... 29

5-9. Printed Wiring Board – BASE I-TAD Board – ... 32

5-10. Schematic Diagram – BASE I-TAD Board – ... 33

5-11. Printed Wiring Board – BASE KEY Board – ... 35

5-12. Schematic Diagram – BASE KEY Board – ... 36

5-13. Printed Wiring Boards – HAND RF/MAIN Boards – ... 37

5-14. Schematic Diagram – HAND RF Board – ... 39

5-15. Schematic Diagram – HAND MAIN Board – ... 41

5-16. IC Pin Function Description ... 45

6. EXPLODED VIEWS

... 49

7. ELECTRICAL PARTS LIST

... 51

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam- aged by heat.

ATTENTION AU COMPOSANT AYANT RAPPORT À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

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SECTION 1 GENERAL

This section is extracted from instruction manual.

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HAND CABINET (REAR)

HAND MAIN BOARD

Note: Follow the disassembly procedure in the numerical order given.

SECTION 2 DISASSEMBLY

5Remove the hand cabinet (rear) to direction of the arrow B.

1Remove the battery case lid to direction of the arrow A.

4claw

3two claws

2two screws (BTP3 × 12)

A B

2two screws (BTP3 × 10)

1four screws (P2 × 5) 3washer

6vol knob

5Remove the hand main board to direction of the arrow C.

4antenna (ANT2)

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CABINET BASE (BOTTOM)

BASE MAIN BOARD, BASE KEY BOARD

2claw

2claw 3cabinet base

(bottom)

1five screws (BTP3 _× 12)

1three screws (P3 × 8) 3screw (P3 × 10)

7seven screws (P3 × 10)

8base key board 5base main board

2three charge springs 4harness

6tone-pulse knob

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SECTION 3 TEST MODE

BASE UNIT

1. Entering the Test Mode

1. While pressing the

[HANDSET LOCATOR]

key, turn the power ON, then change over the

[DIAL MODE]

switch from

“PULSE” to “TONE” within 4 seconds.

2. When enter the test mode, Light up the

[CHARGE]

and

[IN USE]

LEDs.

2. Change the Mode

Press and hold the

[HANDSET LOCATOR]

key for about 2 seconds to change the mode like Mode 1, Mode 2, Mode 3, Mode 4, Mode 1....

Mode 1:

[CHARGE]

LED : Lights up.

Function : Change the channel.

Operation : Each time the

[HANDSET LOCATOR]

key is pressed momentarily, change the channel like 0, 1, 2...9, 0... (default channel is 5ch)

Mode 2:

[CHARGE]

LED : Goes off.

Function : Toggle TX power.

Operation : Each time the

[HANDSET LOCATOR]

key is pressed momentarily, change over ON/

OFF. (default status is ON)

Mode 3:

[CHARGE]

LED : Lights up.

Function : Not used in servicing.

Mode 4:

[CHARGE]

LED : Goes off.

Function : Transmit the tone signal for 3 seconds.

Operation : Press the

[HANDSET LOCATOR]

key momentarily to transmit the tone signal, and blinks the

[CHARGE]

LED.

Each time transmit it, then change the frequency of signal tone like 697 Hz, 770 Hz, 852 Hz, 941 Hz, 1209 Hz, 1336 Hz, 1477 Hz, 1633 Hz, 697 Hz... (default frequency is 697 Hz)

3. Exiting the Test Mode Disconnect the power.

HANDSET

1. Entering the Test Mode

1. Press two keys of

[3]

and

[#]

simultaneously.

2. When enter the test mode, the happy tone is emitted.

2. Key Functions

[CHANNEL]

key

• Change the channel. (Each time the

[CHANNEL]

key is pressed, change the channel like 0, 1, 2...9, 0... (default channel is 5))

• Refresh PLL, RX/TX counters.

[PGM]

key

• Toggle TX power. (ON: lights up the

[TALK/BATT LOW]

LED)

• Refresh PLL, TX counters.

[SPEED DIAL]

key

• Toggle RX power.

• Refresh PLL REF, RX/TX counters.

[REDIAL]

key

• Toggle TX attenuator.

• Refresh PLL status register.

[TALK]

key

• Change PLL gain mode. (lowest → highest (4 steps))

[OFF]

key

• Exit the test mode and emit the sad tone.

Note: All keys pressed will emit the key tone.

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SECTION 4 ELECTRICAL ADJUSTMENTS

6. MOD Deviation Adjustment

1. Connect the RF generator to TP (ANT) on the MAIN RF board.

2. Connect the audio generator (to feedback bridge) to LINE jack (J7) on the BASE MAIN board.

3. Set the audio generator as follows.

output level : –17 dBv output frequency: 1 kHz 4. Set the RF generator as follows.

input frequency : 903.8 MHz filter frequency : 300 Hz to 3 kHz detector : PK+1/2

5. Adjust VR2 on the BASE MAIN board for 25 ± 3 kHz reading on the RF generator.

Setting:

1. Enter the test mode. (refer to page 13) 2. Set the channel to 6ch.

1. RX Loop Voltage Confirmation

1. Connect the digital voltmeter to TP15 (RX LOOP VOLTAGE) on the BASE MAIN board.

2. Confirm that the value of digital voltmeter is 0.5 Vdc to 4.3 Vdc.

2. TX Loop Voltage Confirmation

1. Connect the digital voltmeter to TP14 (TX LOOP VOLTAGE) on the BASE MAIN board.

2. Confirm that the value of digital voltmeter is 0.5 Vdc to 4.3 Vdc.

3. TX Frequency Adjustment

1. Connect the RF generator to TP (ANT) on the BASE RF board.

2. Adjust C15 on the BASE MAIN board for 903.8 MHz ± 3 kHz reading on the RF generator.

4. Quad-Voltage Adjustment

1. Connect the digital voltmeter to TP16 (RX AUDIO) on the BASE MAIN board.

2. Adjust C99 on the BASE RF board for 1.775 ± 0.15 Vdc reading on the digital voltmeter.

5. DEMOD Audio Level Adjustment

1. Connect the RF generator to TP (ANT) on the BASE RF board.

2. Connect the audio generator (to feedback bridge) to LINE jack (J7) on the BASE MAIN board.

3. Set the RF generator as follows.

output frequency : 926.55 MHz output level : –50 dBm FM deviation : 25 kHz MOD tone frequency : 1 kHz

4. Adjust VR1 on the BASE MAIN board for –10 ± 1 dBv reading on the audio generator.

0 dBm = 0.775 V 0 dBv = 1 V BASE UNIT

Adjustment Equipment and Connection

BASE RF Board TP (ANT) RF

generator

BASE MAIN Board

LINE Jack (J7) audio

generator

feedback bridge

DC 9 V

digital voltmeter TP14 (TX LOOP VOLTAGE)

TP15 (RX LOOP VOLTAGE) TP16 (RX AUDIO)

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Adjustment Location:

C99 Quad-Voltage

Adjustment

TP (ANT) – BASE RF BOARD (Side A) –

SW1

TP15 (RX LOOP VOLTAGE) TP14 (TX LOOP VOLTAGE)

TP16 (RX AUDIO) T (Tone)

P (Pulse) VR1

DEMOD Audio Level Adjustment

VR2 MOD Deviation

Adjustment

C15

TX Frequency Adjustment

– BASE MAIN BOARD (Component Side) – – BASE MAIN BOARD (Conductor Side) –

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Setting:

1. Enter the test mode. (refer to page 13) 2. Set the channel to 6ch.

3. Set the

[VOL]

switch (S19) to the “L” position.

4. Disconnect the microphone (U9) wire at the HAND MAIN board.

1. TX Frequency Adjustment

1. Connect the RF generator to TP (ANT) on the HAND RF board.

2. Adjust C92 on the HAND MAIN board for 926.55 MHz ± 3 kHz reading on the RF generator.

2. Quad-Voltage Adjustment

1. Connect the digital voltmeter to TP (RX AUDIO) on the HAND MAIN board.

2. Adjust C25 on the HAND RF board for 1.6 ± 0.075 Vdc reading on the digital voltmeter.

3. DEMOD Audio Level Adjustment

2. Connect the audio generator to TP (RECEIVER +) on the HAND MAIN board.

3. Set the RF generator as follows.

output frequency : 903.8 MHz output level : –50 dBm FM deviation : 25 kHz MOD tone frequency : 1 kHz

4. Adjust R113 on the HAND MAIN board for –90 ± 5 mV reading on the audio generator.

4. MOD Deviation Adjustment

2. Connect the audio generator to TP (MIC IN) on the HAND MAIN board.

3. Set the audio generator as follows.

output level : 35 mV output frequency: 1 kHz

4. Adjust R119 on the HAND MAIN board for 25 ± 3 kHz reading on the RF generator.

HANDSET

Adjustment Equipment and Connection

HAND RF Board TP (ANT) RF

generator

HAND MAIN Board

TP (RECEIVER +)or TP (MIC IN)

TP (RX AUDIO) audio

generator

DC 3.6 V

digital voltmeter

Adjustment Location:

C92 TX Frequency

Adjustment

TP (RECEIVER +)

TP (MIC IN)

TP (RX AUDIO) R113

DEMOD Audio Level Adjustment

R119 MOD Deviation

Adjustment C25 Quad-Voltage

Adjustment TP (ANT)

– HAND RF BOARD – (Side B)

– HAND MAIN BOARD – (Side A)

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SPP-A941 SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM – BASE UNIT Section (1/2) –

LO IN

MIXER

LOCAL OSC BUFFER

RX SYSTEM PLL CIRCUIT

RSSI B.P.F.

F2

RF AMP Q2

B.P.F.

F1

TX AMP Q1 SAW FILTER

F3

TX VCO Q8

CARRIER DETECT AMP

Q3, 4 RX VCO

Q9

BUFFER U5 (3/4)

LOW-PASS FILTER U5 (4/4)

DE- EMPHASIS

PRE EMPHASIS MIX

OUT ANT1

(ANTENNA)

926MHz

903MHz

926.25MHz

F5 10.7MHz

3 A1IN 5 LIMITER

AMP

TX MUTE Q6 LIMITER

AMP

DE- MODULATOR

EXPANDER CIRCUIT

COMPRESSOR CIRCUIT DEM

OUT QUAD-VOLTAGE

C99

DEM TANK

LIM1 IN

LIM2 IN LIM1

OUT 9

FIL2 IN

LOW-PASS FILTER 2

22 20 15

16

FIL2 OUT 1

FIL1 IN LOW-PASS

FILTER

3 FIL1 OUT

4

EXP OUT

20

COMP OUT

COMP MUTE MIC OUT

5

16

EXP MUTE

15

IN2

6 DATA/AUDIO

ADDER U5 (2/4)

SPEAKER AMP U6

OSC Q4

RO1 18 L12

10.7MHz

26

RSSI

10

FIN2 CP2

CP1

16 14

TX SYSTEM PLL CIRCUIT

REFERENCE DIVIDER CONTROL

CIRCUIT

FIN1

STB

CK

DATA

EEP/PLL DATA

EEP CS EEP DI EEP/PLL CLK PLL EN

XIN

X1 4MHz 1

3

11 8

6 7

10 OSC2 26

OSC1 27

13 11 12 9 F4

10.7MHz PRE

NF

PREAMP

23 RIN

RO1 AMP DEMOD

AUDIO LEVEL VR1

MIC AMP 19

MIC NF 10

18

RX DATA 25 TX DATA 24

LED1 IN USE

MIC1 SYSTEM CONTROLLER MIC

U1 (1/2) PLL

U10

MIX, OSC, LIMITER AMP, DET U1

COMPRESSOR, EXPANDER, NOISE GATE U4

+ +

CAR-DET

+ –

MUTE

TX FREQUENCY

C15

DTMF1 – DTMF6

16

+

DTMF LOW-PASS FILTER

U5 (3/4)

3 – 8

MOD DEVIATION

VR2

BUFFER Q17

LIFPOUT/

DTMF

LIFMIN2 MIC+

MIC–

SP1 SPK+

TAD U1 (1/2)

BU HOOK HOOK SW RINGER DET AD0IN

SP EN

25 26

23

56

45 20

50 31

9

39

36

HOOK ON/OFF DETECT

Q1

LEVEL SHIFT Q2

LINE DC COMPARATOR

U2

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SPP-A941

5-2. BLOCK DIAGRAM – BASE UNIT Section (2/2) –

CRADLE/CHARGE DETECT Q15, 16

VOLTAGE DETECT

Q1

+3V REGULATOR

U2 RESET SIGNAL

GENERATOR Q3

RESET SIGNAL GENERATOR

Q2, 3

+5V REGULATOR

U9

ATE

B+ SWITCH (FOR TX SYSTEM)

Q5 SW1

DIAL MODE

KP16 HANDSET LOCATOR

LED2 CHARGE TONE/PULSE

V REG B+

22 TONE

PULSE

21 PAGE

V REG B+

(RX PWR B+) B+

(+3V)

D2

TX PWR B+

ATE

CHARGE TERMINAL CRADLE DET

RESET TX ENABLE

23

19

1 15

+ –

J8

DC IN 9V

– +

15

5 4

1 2

11 12 14

9 10 11 3 4 5 6

B+ SWITCH (FOR LEDS)

Q10 ANSWER

ON/OFF

MAIL BOX 1

05

2 3

LD1 LD2 LD3 LD4

RESET B+

(+3V)

B+

(+3V)

A

LATCH CLK

SHIFT CLK L DATA

6

L CLK

QC

QB

QA QF QGQEQD

U10 LED/7 SEGMENTS LED DRIVE U1

7 SEGMENTS LED (MESSAGE COUNTER)

7SEG D1 L LATCH

4 5 6

62 57 58

SI

SCK FSO

FSKCSCS

7 24

59 8 SOFSI RESETRESET

LED SEL

7SEG D2

X1 3.579545MHz

XTAL2

XTAL1

42 41

ROW0 – ROW4 COL0 – COL2

14 – 18 75 – 77

KEY MATRIX KP0 – 2, 10 – 12, 20, 22

KP30, 31, 40 – 42

EEPROM U3

SYSTEM CONTROLLER U1 (2/2)

TAD U1 (2/2)

55

RSTIN

52

MIN

10 7 SEGMENTS

LED DRIVE Q9 7 SEGMENTS

LED DRIVE Q8

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SPP-A941

5-3. BLOCK DIAGRAM – HANDSET Section –

LO IN

MIXER

LOCAL OSC BUFFER

RX SYSTEM PLL CIRCUIT

RSSI B.P.F.

F1

RF AMP Q2

B.P.F.

F2

TX AMP Q3 SAW FILTER

F3

TX VCO Q1

RX VCO Q8

BUFFER U5 (4/4)

BUFFER Q1 LOW-PASS

FILTER U5 (2/4)

DE- EMPHASIS

PRE EMPHASIS MIX

OUT ANT2

(ANTENNA)

903MHz

926MHz

903.65MHz

F4 10.7MHz

3 A1IN 5 LIMITER

AMP

LIMITER AMP

DE- MODULATOR

EXPANDER CIRCUIT

COMPRESSOR CIRCUIT DEM

OUT QUAD-VOLTAGE

C25

DEM TANK

LIM1 IN

LIM2 IN LIM1

OUT 9

FIL2 IN

LOW-PASS FILTER 2

22 20 15

16

FIL2 OUT 1

FIL1 IN LOW-PASS

FILTER

3 FIL1

OUT 4

EXP OUT

20

COMP OUT

COMP MUTE 5

16

EXP MUTE

15

IN2

6 DATA/AUDIO

ADDER U5 (3/4)

CRADLE DETECT Q15

ATE

B+ SWITCH (FOR ANALOG SYSTEM)

Q18 OSC

Q12

RO1

18

RO2

U9 (MIC) U8 (SPEAKER) 17

L2 10.7MHz

26

RSSI

10

FIN2 CP2

CP1

16 14

TX SYSTEM PLL CIRCUIT

REFERENCE DIVIDER CONTROL

CIRCUIT

FIN1

STB

CK

DATA

PLL DATA PLL CLK PLL EN

XIN

X1 4MHz 1

3

11 8

6 7

12 26 OSC2

27 OSC1

13 11 F5 10.7MHz

PRE IN

PREAMP

23 ROIN

RO1 AMP DEMOD

AUDIO LEVEL R113

VOL S19

MIC AMP 19

MIC NF 10

RX DATA 25 TX DATA 24

D5 TALK/BATT LOW SYSTEM CONTROLLER

U3 PLL

U3

MIX, OSC, LIMITER AMP, DET U1

COMPRESSOR, EXPANDER, NOISE GATE U7

+ +

MOD DEVIATION

R119

+ –

RO2 AMP + –

REGULATOR

ERROR AMP MUTE

MCU PWR B+

V-ANA PWR B+

ATE

CHARGE TERMINAL TX

FREQUENCY C92

19

TALK/BATT LED B+

(MCU PWR) 17

CRADLE DET 21

23

+

–

OUTPUT FEED BACK

INPUT

D7

M (MEDIUM) L (LOW)

H (HIGH)

U4 (BUZZER) BUZZER DRIVE

Q14, 17 BEEP 20

REGULATOR,

RESET SIGNAL GENERATOR, BATTERY DETECT U11

15 3

14

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SPP-A941

5-5. PRINTED WIRING BOARD – BASE RF Board –

Caution:

Pattern face side: Parts on the pattern face side seen from (Side B) the pattern face are indicated.

Parts face side: Parts on the parts face side seen from (Side A) the parts face are indicated.

5-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and ¹/4W or less unless otherwise specified.

• ^f : internal component.

• 4: printed coil.

• C : panel designation.

• U : B+ Line.

• H : adjustment for repair.

• Power voltages are dc 9 V and fed with regulated dc power supply from external power voltage jack (J8) on the BASE MAIN board, dc 12 V and fed with regulated dc power supply from modular jack (J7) on the BASE MAIN board with 100 Ω in series, and dc 3.6 V and fed with regulated dc power supply from battery terminal on the HAND MAIN board.

• Voltages and waveforms are dc with respect to ground in test mode.

∗

: Impossible to measure

• Voltages are taken with a VOM (Input impedance 10 MΩ).

Voltage variations may be noted due to normal produc- tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc- tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

N : RX

O : TX

P : BELL

• Semiconductor Location

Ref. No. Location

D1 B-1

D2 B-1

D3 C-2

D5 E-2

Q1 B-2

Q2 C-4

Q3 E-3

Q4 F-3

Q8 B-2

Q9 C-3

U1 D-2

U10 C-1

Note on Printed Wiring Board:

• X: parts extracted from the component side.

• Y: parts extracted from the conductor side.

• ^x : parts mounted on the conductor side.

• W : indicates side identified with part number.

• ^z : Through hole.

• ^f : internal component.

• b: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

• : connected by carbon pattern.

BASE RF BOARD

^{(SIDE B)}

BASE RF BOARD

^{(SIDE A)}

00

35-4396-03-

R35 R34

C13

C12

C54 C51

C55

C79

C78 C74

C89

C27 C22

C37

C19 C18

C38 C58

C3 C1

C14

C17 C66

C8 C56

C57

C6

R33

R29

R40 R38

R5

R6

R7 R41

R57

R50 R52

R67

R12

R19

R179 R27 R66 C77 R47

R68

R28 C60 C81 C11 C63 C2C4 C15 C16

C67 C69 C70

C72 C71 C65 C64 C36 C35

C21 C34

C9 C7 C5

C52 C59

C82C76 C25

C28

C39 R54

R21 R16R14

R53 R51 R61 C146 C147 C95 R17 R15

C30 C32 C29 C31 R48 R150 C23 C26 C85 C86 C24 C42

C33

C84 C83

R30 R2

R3

R32 R4R25 R8

R37 R9

R39R45

R10

R20 R13

R31R58

F1 1 3 2

U10

D3^A K D1

D2

A A

K K

8 1

16

14 15

28 1

9

L13

U1

D5 A K

Q3^{B C E}

Q4B C E

Q2 Q1

ECB

Q8 B C E

B C E

E

1

1 3 2

2 3 4 5 6

F3 F2

(SHIELD CASE) TP (ANT)

L1, 2 (PRINTED COIL)

L2

L1

ANT1

L6 L8

L5 L7

L16

L18

L4

L19

L20

L3 L9

L10

(SHIELD CASE)

L3-10, 16, 18-20 (PRINTED COIL)

C43

C40

C99

1 12

F5

F4

L12 Q9

05

1 2 3 4 5 6 7 8

A

B

C

D

E

F

A

BASE MAIN BOARD J2 (Page 28)

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SPP-A941

5-6. SCHEMATIC DIAGRAM – BASE RF Board – •

See page 43 for IC Block Diagrams.

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SPP-A941

D3 B-6

D4 B-12

D8 B-4

D9 B-4

D10 B-4

D11 B-4

D12 B-4

D16 C-3

D50 G-9

Z12 E-3

Z13 E-3

Q1 I-10

Q2 I-6

Q3 I-6

Q4 I-9

Q5 H-9

Q6 I-4

Q8 I-14

Q9 I-14

Q10 I-14

Q12 C-11

Q15 B-12

Q16 E-12

Q17 D-5

U1 H-8

U2 C-6

U3 J-7

U4 H-3

U5 H-6

U6 I-13

U7 B-5

U8 D-5

U9 F-4

U10 G-12

5-7. PRINTED WIRING BOARD – BASE MAIN Board –

• Semiconductor Location Ref. No. Location

L21

L1

U9 3

1 2

1

3

4

4 1

3 2

L27 J7

L2 L3

L28

L4

L23

R78

27 J3

1 1 22

18

1 12

1

SW1 R108

SW1 DIAL MODE

T P VR2

VR1

D12

D11

D9

D10 D8

F1

L26

T1

L25

X1 R2

R3

R63

R15 U8

U7

+

ATE

–

EC5 + EC4 +

EC11 +

EC10

J1

J4 +

EC1 +

EC6 +

EC3 + EC2 +

EC133 + EC150

+ EC137 +

EC134 +

EC132 +

C15 C131

05

D

BASE KEY BOARD

C

BASE I-TAD BOARD HD1 1-676-748-

B

BASE I-TAD BOARD

A

BASE RF BOARD HD2

C97

C46

C95

TP15(RX LOOP VOLTAGE)

TP14 (TX LOOP VOLTAGE)

TP16 (RX AUDIO)

C99 R140

R19

R5

R4

C4

R6

5

8 4

1 R8

U2 R9

R138

R139

R121 R132 C150

R122

R141

C24

R149 R142 C1

R143

C2

R7

R69

R32

R20

R104

R51 R97

D4K A K Q15

B C E

Q12 B C E

Q16

E C B

Q4 E C B Q5B C E

Q1 B C E

Q2 Q3 B C E

B C E

R71

R70

R81

R16 R80

R17

C48 9

16 8

1

C45

R82

14 1

15 U1

28

R21

C51 R38

C10 R105

R27

C9

C8 R39 R67

C6

R72

R95 R85

C38 C39 R91

R60 C28 C41 C26

R89

C40

R90 R86

R93 C7

C30

R68

C29

C31 8

14 U5

7

1

R23

R47 R58 C22

R77 R61

R62

R26 C27

C35 R76 C32 R75

C34 C17

R53 C18

C19 R54

R57

1 12

24 U4 13 R52 R56 C20

C25

R55

R59

C136

C135

C52

C23

C16

C33 R74

C12 C53

R48 C13 R49 R50 C14

R92

C50

R22 R30 R46

R241

R73

R84

R64

C5

C36

C37 R66 R65

R44

R43

R42

R41

R40 R37

R36

R34

R35

R45

C11

5

8 U3

4

1

R29 R25

R33

R31 R96

R14

R13

R12

R11 R10 U10

R1

C49 R100

R97 U6

R28 R99 R102

C3

C44 R101

C42

5

8 4

1

C43

R106 R107 R98

R103

Q9E C B Q10

E C B Q8

E C B

D3 K A K

D16 K

A K A K

A

Z12 Z13 Q6 E C B

E C B Q17

5 3 1 2 4 6

DC IN 9V J8

– +

BASE MAIN BOARD

CHARGE TERMINAL

MIC1 MIC

EC9 +

EC8 + LINE

K

15 A

B

C

D

E

F

G

H

I

J

1 2 3 4 5 6 7 8 9 10 11 12 13 14

11

J2 R150

D50

(Page 24) (Page 32) (Page 32)

(Page 35)

(23)

SPP-A941

5-8. SCHEMATIC DIAGRAM – BASE MAIN Board – •

See page 31 for Waveform.

•

(Page 26)

(Page 33)

(24)

SPP-A941

5-9. PRINTED WIRING BOARD – BASE I-TAD Board –

• Waveforms

– BASE MAIN Board – 1U1 wj (OSC1)

– HAND MAIN Board – 3U3 wj (OSC1)

5 Vp-p

250 ns

4 Vp-p

250 ns

– BASE I-TAD Board – 2U1 rs (XTAL1)

2 Vp-p

279 ns

Ref. No. Location

D1 B-4

D2 A-3

Q1 H-2

Q2 H-2

Q3 B-2

U1 C-3

U2 B-4

U3 F-2

C37 C26 R9

L3

L1 R23

R8 C1

C5 C25 R18

R17

R30 R14

R31

R20

C24 R13

R15 ECB

Q3

+ TC10

+ TC1

TC13+

U1

U2

1 24

64 41

1 3

6 4

25 40

80 65

U3

18 1 TC3

R29 R33 R31 R36

C67

C32 C16 C50 C51 C52 C53 C54 C60 C57 C59 C56 C58 R1

C19

C15 C14 C30

C29

C22R24

C28R21 C27

R10

R7

C12 C11

R19

C2

TC2

C3

22 HD1 1

C20 C23 C18

R32

C10 C13 R2 C6 C7

1 14

28 15

R28 +

TC7 +

TC11+

+

+ TC14

TC9+

TC8 +

X1

I-TAD BOARD

^{(SIDE B)}

I-TAD BOARD

^{(SIDE A)}

Q1 B C E

Q2 BCE

05

D2

K A

D1 K A

B

BASE MAIN BOARD J1

C

BASE MAIN BOARD

J4

HD2

A

B

C

D

E

F

G

H

1 2 3 4 5

35-4388-06-

35-4388-06- 00 00

(Page 28)

(25)

SPP-A941

5-10. SCHEMATIC DIAGRAM – BASE I-TAD Board – •

(Page 30)

(26)

SPP-A941

5-12. SCHEMATIC DIAGRAM – BASE KEY Board – 5-11. PRINTED WIRING BOARD – BASE KEY Board –

• Semiconductor Location Ref. No. Location

LD1 C-6

LD2 H-5

LD3 G-5

LD4 F-5

LED1 I-2 LED2 H-2

U1 C-4

(Page 28)

(Page 30)

BLK

RED SP1

LD2 KP10

LED2

LED1

KP20

KP11

LD3 LD4 KP12

KP42 KP41

KP30 KP31

LD1 KP2

KP1

U1 (MESSAGE COUNTER)

27 1

BASE KEY BOARD

KP0 REC/MEMO

ERASE

TIME/SET

SLOW REPEAT

CHARGE

IN USE

KP10, LD2 MAIL BOX

1 KP11, LD3

2 KP12, LD4

3 SELECT

KP40 MENU

– +

VOLUME KP2, LD1 ANSWER ON/OFF

1 8

16 9

D

1-676-810- 11

KP22 QUICK SKIP

KP16 HANDSET LOCATOR

BASE MAIN BOARD

J3 05

A

B

C

D

E

F

G

H

I

J

1 2 3 4 5 6

(27)

SPP-A941

D5 B-8

D6 H-7

D7 G-7

D8 F-6

D14 H-6

Q1 E-6

Q12 C-6

Q13 B-7

Q14 G-7

Q15 G-6

Q16 B-6

Q17 F-8

Q18 G-7

Q19 E-6

Q20 E-6

U3 D-7

U5 E-7

U7 C-7

U11 F-7

5-13. PRINTED WIRING BOARDS – HAND RF/MAIN Boards –

– HAND RF Board – Ref. No. Location

D1 D-4

D2 D-4

D3 D-3

Q1 E-4

Q2 C-2

Q3 E-3

Q8 D-3

U1 I-3

U3 D-4

– HAND MAIN Board – Ref. No. Location

35-4331-02- 00

HAND RF BOARD (SIDE A) HAND MAIN BOARD (SIDE A)

HAND MAIN BOARD (SIDE B)

HAND RF BOARD (SIDE B)

C32 C31 C30 C29 C28 C23 C24 C26 C85 C86 R12 R18 C42

C21C33 C37 C39

C10C34

C16 R6 R5 C14 R37 C70 R45 R58

C81 C60

C9

C8

C1

C2 C7C6 R33

R32

R3 C59 C52R30R28

R31C84

R41

C20R4 C63 R54 R53 R51 R76 C139 C106 C105 C108 R111 R138 R78 R112 C111C112

R3 R116 R4

R110 C130 R131 C131 C110 C116 C2 R115 R114

R63 R69 R70 R141 C138R145 R103

C140

R134 C129R146 R100R142

R102

R87 R88 R95R90 R85 R86 C109 R139

R128

R127

C134 R147 R144

R49

R109

R108

C104 R80 R42 C107 C114

R123C124

R125C128

C127

C132R75 C93C91C75 C123 C40 R36R140 R135R24R65R1

R105

R23 R97R143 R106 R83R89

C118R98 R99 R84R82 R81 R122 R121 R94C121R133

C3 C97

R107 C101 C125 R91

R96 R74 R124

R130

R129 R77

R120 R66

C77 R132

R14

C36

C11 C38 C35

C17 R7

C64 C65 R9

R8

R39 C69

C66 C67 R38

C72 R40 C71 C15

C4

C41

C22

R15 R13

R16 R11

C19

C74

C78 R52 R50

C79 C82

R61 R68 C83

C58 C51 C54 C55

R57

R29 C57 C13 C12 C3

R35 R34 R2 C5

R67 R47 C76 C89 R48

10 1

(SHIELD CASE)

L12

C25

1 2 3

4 5 6

F3

Q2

Q8

E C

B E

F1 2 3

1 B

C E

Q1 B

C E

Q3 B

C E

AD3 K

D1

D2 ^A

A

K K U3

16 9

8 1

F2 2

3

1 TP (ANT)

L4 L1

L5 L6 L16

L7

L8 L18

L20 L3

L9

L19 ANT2

U7 1

12 13

24

TALK/BATT LOW D5

U3

28 15

14 1

U5 1

7 8

14

U11 1

8 9

16 Q16 Q13

ECB ECB

Q12 ^E

CB

Q19

Q1

Q20 E C B

E BC

Q15

Q18 Q14

Q17

E C B

E C B K

K/A

A

E C B

D8

K K K

K

K/A A

A A

D7

D44 D6

C100 C99C119

C102 C122

C126 C113

R113

R119 C92

X1

TP ( RECEIVER + )

TP ( MIC IN ) TP ( RX AUDIO ) RED BLK

U4 U8

RED

BLK

RECHARGEABLE BATTERY PACK (BP-T23) 3.6V 600mAh

S19

S3 S2

S1

S4 H

M

L

VOL

OFF CHANNEL

FLASH TALK

1 10

1

S15 S5

2 ABC

S6 3 DEF

S9 6 MNO S8

5 JKL S7

4 GHI

S10 7 PQRS

S12 9 WXYZ

S14 0 OPER S13

TONE

S16 PGM

S17 SPEED DIAL

S18 REDIAL S11

8 TUV

1 2 3 4 5 6 7 8 9 10 11 12

A

B

C

D

E

F

G

H

+

+ + +

+

(28)

SPP-A941

5-14. SCHEMATIC DIAGRAM – HAND RF Board – •

(Page 42)

(29)

SPP-A941

5-15. SCHEMATIC DIAGRAM – HAND MAIN Board – •

•

(Page 40)

(30)

• IC Block Diagrams

U1 U2765B-AFSG3 (BASE RF Board) U1 U2765B-AFSG3 (HAND RF Board)

U3 TB31202BFN-EL (HAND RF Board) U10 TB31202BFN-EL (BASE RF Board)

U3 CAT93C46KI (BASE MAIN Board)

VCC/2

COMPARATOR SLICER LOCAL OSC

BUFFER

VCC2 LO REF LO IN GND2 NC VCC3 LIM1 OUT GND3 LIM2 IN LIM2 REF GND4 DEM NTANK DEM TANK DEM OUT

NC A1 REF A1 IN GND1 MIX OUT VCC1 MIX NOUT LIM1 REF LIM1 IN RSSI DATA OUT COM NIN COM IN SL IN

1 2 3 4 5 6 7 8 9 10 11 12 13 14

28 27 26 25 24 23 22 21 20 19 18 17 16 15

A1 MIX

LIMITER AMP

DE- MODULATOR

RSSI

+ –

2 3 4 5 6 7 8

9 10

1

12 11 14 13

16 15

BUF

BUF PROGRAMABLE

DIVIDER

PHASE COMPARATOR

OUTPUT

SWITCH

L. OSC

REFERENCE DIVIDER

LOCK DET

CONTROL CIRCUIT 1/2

1/2

1/2 1 BUF

––––––––

32, 33

––––––––1 32, 33

PHASE COMPARATOR

OUTPUT

PROGRAMABLE DIVIDER

FIN1 VCC CP1 GND LD CK DATA STB

FIN2 VCC CP2 GND SW XIN XOUT BO

U4 TA31103F (BASE MAIN Board) U7 TA31103F (HAND MAIN Board)

U10 MC74HC595AF (BASE MAIN Board) U11 LP2953IM (HAND MAIN Board)

1 2

E-RECT

PRE OUT

PRE NF

VCC VREFTHROUGRO2RINEXP OUT RO1 COMP MUTE EXP MUTE

4

FIL1 OUT

3

FIL2 IN

FIL2 OUT

+

– +

–

5 6 7 8 9

IN2 C-RECT C-NF

FIL1 IN COMP OUT

10 11 12

2423 22 21 20 19 18 17 1615 14 13

GND

MIC IN

MIC OUT MIC NF

∆G

VREF

+ –

VREF VREF

SWITCH CONTROL

+ – +

–

MIC AMP SUM

AMP +

– +

– ∆G

VREF PRE AMP VREF

SUM AMP

RO1 AMP

COMP MUTE EXP MUTE

THROUG THROUGH

IN 2 AMP FILTER

AMP 1 FILTER

AMP 2

+ –

VREF RO2 AMP + –

1 2 3 4 5 6 7 8

9 10

16 15 14 13 12 11

SHIFT REGISTER

LATCH

PARALLEL DATA OUTPUT

GND VCC

LATCH CLOCK

PARALLEL DATA OUTPUT SERIAL DATA INPUT OUTPUT ENABLE SHIFT CLOCK SERIAL DATA OUTPUTRESET

QB QC QD QE QF QG QH SQH

AQA

2 3 1

8

9 10 11 12 13 14 15

7 5

6 4 SHUT DOWN

ERROR NC GND NC OUTPUT

SENSE GND

VREF

COMP IN COMP OUT GND INPUT

FEEDBACK

5V TAP +

–

+ –

+ – ERROR

AMP

SHUT DOWN COMPARATOR DROP OUT DETECTION AMP

AUXILLARY COMPARATOR

1.23V 16 GND

8 7 6 5

MEMORY ARRAY 128X8 bit/

64X16 bit

HIGH VOLTAGE GENERATOR

ADDRESS DECODER

DATA REGISTER

DECODE & CONTROL LOGIC

CLOCK GENERATOR

2

1 3 4

BUFFER

VCC NC ORG GND

CS SK DI DO

U6 KA8602D (BASE MAIN Board)

+ – 2

3 4

BIAS CIRCUIT

+ – 1

8 7

6 5

AMP1 AMP2

IN+

IN–

OUT1

VCC GND

OUT2 MUTE RIPPLE REJECTION

(31)

5-16. IC PIN FUNCTION DESCRIPTION

• BASE MAIN BOARD U1 LSC527738DW-A94100FB (SYSTEM CONTROLLER)

Pin No. Pin Name I/O Description

1 RESET I System reset signal input from the reset signal generator (Q2, 3) “L”: reset

For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

2 IRQ I Interrupt request signal input terminal Not used (fixed at “H”) 3 to 8 DTMF1 to

DTMF6 O DTMF signal output terminal

9 EEP CS O Chip select signal output to the EEPROM (U3) “L”: un-select, “H”: select 10 PLL EN O Chip enable signal output to the TB31202BFN (U10)

When PLL EN goes from “L” to “H”, it load data from PLL DATA 11 EEP/PLL DATA O Serial data output to the TB31202BFN (U10) and EEPROM (U3) 12 EEP DI I Serial data input from the EEPROM (U3)

13 EEP/PLL CLK O Serial data transfer clock signal output to the TB31202BFN (U10) and EEPROM (U3)

14 VSS — Ground terminal

15 TX ENABLE O TX system power supply on/off control signal output “L”: TX system power on

16 MUTE O

RX and TX muting control signal output to the TA31103F (U4) “L”: muting on RX mode: After receiving premble bits from handset muting it until data sent finished TX mode: During sending data to handset, muting it

17 OFF HOOK O Hook on/off control signal output terminal “L”: off hook, “H”: on hook 18 CAR-DET I Carrier detect signal input from the U2765B (U1) “L”: signal, “H”: no signal

19 CRADLE DET I Detect signal input of the handset unit on cradle or off cradle “L”: on cradle, “H”: off cradle 20 RINGER DET I Detect signal input of the ringer coming “L”: ringer is detected

21 PAGE I HANDSET LOCATOR switch (KP16) input terminal “L” is input when key pressing 22 TONE/PULSE I DIAL MODE select switch (SW1) input terminal “L”: pulse, “H”: tone

23 ATE I/O Communication in/out terminal with ATE program 24 TX DATA O Transmit data output terminal

25 RX DATA I Receive data input terminal

26 OSC2 O Main system clock output terminal (4 MHz) 27 OSC1 I Main system clock input terminal (4 MHz)

28 VDD — Power supply terminal (+5V)

SONY-SPP-A941

SERVICE MANUAL US Model

Canadian Model

SPECIFICATIONS

SPP-A941

Ver 1.1 1999. 11

TABLE OF CONTENTS 1. GENERAL

2. DISASSEMBLY

3. TEST MODE

4. ELECTRICAL ADJUSTMENTS

5. DIAGRAMS

6. EXPLODED VIEWS

7. ELECTRICAL PARTS LIST

SECTION 1 GENERAL

HAND CABINET (REAR)

HAND MAIN BOARD

SECTION 2 DISASSEMBLY

CABINET BASE (BOTTOM)

BASE MAIN BOARD, BASE KEY BOARD

SECTION 3 TEST MODE

BASE UNIT

[HANDSET LOCATOR]

[DIAL MODE]

[CHARGE]

[IN USE]

[HANDSET LOCATOR]

[CHARGE]

[HANDSET LOCATOR]

[CHARGE]

[HANDSET LOCATOR]

[CHARGE]

[CHARGE]

[HANDSET LOCATOR]

[CHARGE]

HANDSET

[3]

[#]

[CHANNEL]

[CHANNEL]

[PGM]

[TALK/BATT LOW]

[SPEED DIAL]

[REDIAL]

[TALK]

[OFF]

SECTION 4

ELECTRICAL ADJUSTMENTS

0 dBm = 0.775 V 0 dBv = 1 V BASE UNIT

[VOL]

HANDSET

SPP-A941 SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM – BASE UNIT Section (1/2) –

+ +

+

SPP-A941

5-2. BLOCK DIAGRAM – BASE UNIT Section (2/2) –

+ –

SPP-A941

5-3. BLOCK DIAGRAM – HANDSET Section –

+ +

+

–

SPP-A941

5-5. PRINTED WIRING BOARD – BASE RF Board –

5-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

∗

BASE RF BOARD

BASE RF BOARD

1 2 3 4 5 6 7 8

A

B

C

D

E

F

A

SPP-A941

5-6. SCHEMATIC DIAGRAM – BASE RF Board – •

SPP-A941

SERVICE MANUAL ^{US Model}