Sony SPP-901 Service Manual

SPP-901

SERVICE MANUAL

Ver 1.1 1999. 12 With SUPPLEMENT-1 (9-956-692-82)

SPECIFICATIONS

Canadian Model

MICROFILM

CORDLESS TELEPHONE

GENERAL

This section is extracted from instruction manual.

– 3 –

– 4 –

– 5 –

SECTION 2

d

DISASSEMBLY

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

HAND CABINET (REAR)

5

Remove the hand cabinet (rear) to direction of the arrow

3

two claws

4

claw

B

3

two claws

B

2

two screws (BTP3 × 12)

A

Remove the battery case li

1

to direction of the arrow A.

HAND MAIN BOARD

3

4

antenna (ANT2)

2

washer

two screws

×

10)

(BTP3

C

6

vol knob

1

four screws (P2 × 5)

5

Remove the HAND MAIN boar to direction of the arrow C.

– 6 –

BASE CABINET

s

2

claw

2

claw

1

four screws (BTP3

×

16)

3

cabinet (lower)

BASE MAIN BOARD, BASE KEY BOARD

1

four screws (BTP3

×

12)

3

BASE MAIN board

1

three screws (BTP3

×

12)

2

three charge spring

4

tone-pulse knob

5

two screws (P2.6

6

BASE KEY board

×

8)

– 7 –

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

[LINE] LEDs.

2. Change the Mode

Press and hold the [HANDSETLOCATOR] key for about 2 sec- onds 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 : T o ggle 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 uesed in servicing.

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

• T oggle 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.

Mode 4:

[CHARGE] LED : Goes off.

Function : Transmit the tone signal for 3 seconds. Operation : Press the [HANDSETLOCATOR] key mo-

mentarily 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.

Note: All keys pressed will emit the key tone.

– 8 –

SECTION 4

ELECTRICAL ADJUSTMENTS

0 dBm = 0.775 V 0 dBv = 1 V

BASE UNIT

Adjustment Equipment and Connection

BASE RF Board

RF

generator

audio

generator

feeding

bridge

Setting:

1. Enter the test mode. (refer to page 8)

2. Set the channel to 6ch.

1. TX Frequency Adjustment

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

2. Adjust C56 on the BASE MAIN board for 903.8 MHz ± 3 kHz reading on the RF generator.

Adjustment Location:

– BASE RF BOARD –

(Side A)

C99

Quad-Voltage

Adjustment

TP (ANT)

BASE MAIN Board

LINE Jack (J1)

TP (RX AUDIO)

DC 9 V

TP (ANT)

digital

voltmeter

– BASE MAIN BOARD –

(Component Side)

R39

MOD Deviation

Adjustment

2. Quad-Voltage Adjustment

1. Connect the digital v oltmeter to TP (RX A UDIO) on the B ASE MAIN board.

2. Adjust C99 on the BASE RF board for 1.6 ± 0.075 Vdc reading on the digital voltmeter.

3. DEMOD Audio Level Adjustment

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

2. Connect the audio generator (to feeding bridge) to LINE jack (J1) 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 R40 on the BASE MAIN board for –10 ± 1 dBv reading on the audio generator.

4. MOD Deviation Adjustment

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

2. Connect the audio generator (to feeding bridge) to LINE jack (J1) on the BASE MAIN board.

3. Set the audio generator as follows. output level : –13 dBv output frequency: 1 kHz

4. Adjust R39 on the B ASE MAIN board for 25 ± 3 kHz reading on the RF generator.

– BASE MAIN BOARD –

(Component Side)

C56

TX Frequency

Adjustment

HANDSET

Adjustment Equipment and Connection

HAND RF Board

RF

generator

audio

generator

Setting:

1. Enter the test mode. (refer to page 8)

2. Set the channel to 6ch.

3. Set the

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 A UDIO) on the HAND MAIN board.

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

3. DEMOD Audio Level Adjustment

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

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.

TP (ANT)

HAND MAIN Board

TP (RECEIVER +)or TP (MIC IN)

TP (RX AUDIO)

DC 3.6 V

[VOL] switch (S19) to the “L” position.

digital

voltmeter

Adjustment Location:

– HAND RF BOARD –

(Side B)

TP (ANT)

C25

Quad-Voltage

Adjustment

– HAND MAIN BOARD –

(Side A)

C92

TX Frequency

Adjustment

R113

Demode Audio Level

Adjustment

R119

MOD Deviation

Adjustment

R40

Demode Audio Level

Adjustment

TP (RX AUDIO)

4. MOD Deviation Adjustment

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

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

S1

TONE

PULSE

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.

– 9 – – 10 –

TP (RECEIVER +)

TP

(MIC IN)TP(RX AUDIO)

SPP-901

SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM – BASE UNIT Section –

ANT1

(ANTENNA)

926MHz

B.P.F.

F2

RF AMP

Q2

903MHz

B.P.F.

F1

926.25MHz

SAW

FILTER

F3

TX AMP

Q1

14

MIX, OSC, LIMITER AMP, DET

3 5

CP2

A1IN

LOCAL OSC

RX SYSTEM

PLL CIRCUIT

MIXER

BUFFER

LO IN

26

RX VCO

PLL U10

U1

10.7MHz

MIX

OUT

Q9

FIN2

L12

16

F5

10.7MHz 9

LIM1 IN

TX VCO

Q8

LIMITER

AMP

LIM1

OUT

F4

10.7MHz 20

LIM2 IN

LIMITER

AMP

RSSI

10

CARRIER

DETECT AMP

Q3, 4

18

CAR-DET

16

DEM

TANK

DE-

MODULATOR

RX DATA TX DATA

MUTE

C99

QUAD-VOLTAGE

DEM

OUT

25 24

16

15

BUFFER U5 (1/4)

LOW-PASS

FILTER

U5 (2/4)

3

LOW-PASS

FILTER FIL1 OUT

FIL1

222

IN

FIL2 IN

LOW-PASS

FILTER

4

FIL2 OUT

DATA/AUDIO

ADDER

U5 (4/4)

DE-

1

EMPHASIS

COMPRESSOR, EXPANDER, NOISE GATE

U4

+

R39

MOD

DEVIATION

23

PRE IN

PREAMP

EMPHASIS

PRE

EXPANDER

CIRCUIT

COMP OUT

5

EXP OUT

+

IN2

20

6

AUDIO LEVEL

COMPRESSOR

EXP MUTE

15

R40

DEMOD

CIRCUIT

COMP

MUTE

16

+

RO1 AMP

RO2 AMP

MIC

AMP

RO1

– +

RO2

MIC IN

18

17

11

ROIN

19

• SIGNAL PATH : RX : TX : BELL

CP1

PLL CIRCUIT

CONTROL

CIRCUIT

CK

DATA

TX SYSTEM

STB

REFERENCE

DIVIDER

XIN

11867

FIN1

OSC Q10

13

3 2 4 1

DI

DO

CLK

EEPROM

U7

DIAL MODE

DTMF

3 – 8

DTMF1 – DTMF6

SYSTEM CONTROLLER

U6

D3

C56

TX

FREQUENCY

26

OSC2

27

OSC1

X1

4MHz

10

PLL EN

13

EEP/PLL CLK

11

EEP/PLL DATA

12

EEP DI

9

EEP CS

CS

TONE

S1

PULSE

S1

HANDSET LOCATOR

22

TONE/PULSE

21

PAGE

OFF HOOK

RINGER DET

CRADLE DET

TX ENABLE

ATE

RESET

17 20

23

19

15

1

LINE

LED DRIVE

Q5

LOW-PASS FILTER

U5 (3/4)

T1

LINE

TRANSFORMER

HOOK ON/OFF

U1

V REG B+

(RX PWR B+)

TX PWR B+

D2

CHARGE

RESET SIGNAL

GENERATOR

Q8, 9

D1 – 4

RECT

D1

D2

(FOR TX SYSTEM)

RINGER DETECT

U2

B+ SWITCH

Q11

D3

D4

CRADLE/CHARGE

DETECT

Q6, 7

REGULATOR

+5V

U3

J1

LINE

ATE

+

–

DC IN 9V

–

CHARGE TERMINAL

J2

+

05

– 11 – – 12 –

SPP-901

5-2. BLOCK DIAGRAM – HANDSET Section –

ANT2

(ANTENNA)

903MHz

B.P.F.

F1

RF AMP

Q2

926MHz

B.P.F.

F2

903.65MHz

SAW

FILTER

F3

TX AMP

Q3

14

MIX, OSC, LIMITER AMP, DET

3 5

CP2

CP1

A1IN

LOCAL OSC

RX SYSTEM

PLL CIRCUIT

TX SYSTEM

PLL CIRCUIT

MIXER

BUFFER

LO IN

26

RX VCO

PLL

U1

MIX OUT

Q8

U3

10.7MHz

FIN2

FIN1

C25

QUAD-VOLTAGE

16

DEM

L2

16

13

F4

10.7MHz 9

LIM1 IN

TX VCO

Q1

LIMITER

AMP

LIM1

OUT

F5

10.7MHz

LIM2 IN

LIMITER

20

AMP

RSSI

10

SYSTEM CONTROLLER

U3

TANK

DE-

MODULATOR

RX DATA TX DATA

MUTE

BEEP

20

+

IN2

6

AUDIO LEVEL

EXP MUTE

15

COMP OUT

EXP

OUT

FIL2

FILTER

FIL1

222

IN

FIL2 IN

LOW-PASS

FILTER

4

OUT

DATA/AUDIO

ADDER

U5 (3/4)

U4

(BUZZER)

DE-

1

EMPHASIS

COMPRESSOR, EXPANDER, NOISE GATE

U7

+

R119

MOD

DEVIATION

23

PRE IN

PREAMP

EMPHASIS

PRE

EXPANDER

CIRCUIT

5

DEM

OUT

25 24

19

20

15

BUFFER U5 (4/4)

LOW-PASS

FILTER

U5 (2/4)

3

BUFFER

Q1

BUZZER DRIVE

Q14, 17

LOW-PASS

FIL1 OUT

S19 VOL

R113

DEMOD

COMPRESSOR

CIRCUIT

COMP

MUTE

16

ROIN

19

– +

RO1 AMP

MIC

AMP

L (LOW)

M (MEDIUM)

H (HIGH)

18

RO1

– +

RO2 AMP

RO2

MIC NF

U8

17

10

(SPEAKER)

U9

(MIC)

CONTROL

CIRCUIT

CK

DATA

STB

REFERENCE

DIVIDER

XIN

11867

OSC Q12

FREQUENCY

S1 – S18

KEY MATRIX

(SEET KEY)

C92

LED DRIVE

D5

TALK/BATT LOW

Q2

(MCU PWR)

MCU PWR B+

V-ANA PWR B+

TX PWR B+

RX PWR B+

B+

ATE

18

17

21

23

15

16

LIGHT LED

TALK/BATT LED

TX

26

OSC2

27

OSC1

X1

4MHz

12 13 11

6 – 3 10 – 7

PLL EN PLL CLK PLL DATA

ROW1 – ROW4

COL0 – COL3

CRADLE DET

TX ENABLE

RX ENABLE

D1 – 4

(KEY BACK LIGHT)

B+ SWITCH

(FOR ANALOG SYSTEM)

B+ SWITCH

(FOR TX SYSTEM)

B+ SWITCH

(FOR RX SYSTEM)

Q18

Q13

Q16

RESET SIGNAL GENERATOR, BATTERY DETECT

OUTPUT

3

FEED BACK

14

ERROR

6

COMP OUT

10

REGULATOR,

ERROR

AMP

MUTE

DETECT AMP

COMPARATOR

U11

REGULATOR

SHUT DOWM

COMPARATOR

DROP OUT

AUXILLARY

1.23V

INPUT

SHUT

DOWN

COMP IN

CRADLE

DETECT

Q15

15

5

11

D7

ATE

+

–

RECHARGEABLE BATTERY PACK

(BP-T23)

CHARGE TERMINAL

• SIGNAL PATH : RX : TX : BELL

05

– 13 –

IRQ

RESET

LOW BATT

Q20

WATCH DOG TIMER

2

1

22

COMPARATOR

U5 (1/4)

SWITCHING

Q19

– 14 –

SPP-901

5-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Printed Wiring Board:

• X : parts extracted from the component side.

• Y : parts extracted from the conductor side.

• W : indicates side identified with part number.

¢

•

• b : Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution: Pattern face side: Parts on the pattern f ace 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.

: internal component.

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/ specified.

¢

•

• 2 : nonflammable resistor.

• 4: printed coil.

• C : panel designation.

• U : B+ Line.

• H : adjustment for repair.

• Power v oltages are dc 9 V and f ed with regulated dc power

• Voltages and w av ef orms are dc with respect to ground in

• V oltages are taken with a V OM (Input impedance 10 MΩ).

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

: internal component.

supply from external power voltage jac k (J2) on the BASE MAIN board, dc 12 V and fed with regulated dc power supply from modular jack (J1) on the BASE MAIN board with 100 Ω in series, and dc 3.6 V and f ed with regulated dc power supply from battery terminal on the HAND MAIN board.

test mode. Voltage variations may be noted due to normal produc-

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

tion tolerances.

N : RX O : TX P : BELL

4

W or less unless otherwise

• Waveforms – BASE MAIN Board –

1 U6 @¶ OSC1

250 ns

3.4 Vp-p

– HAND MAIN Board –

1 U3 @¶ OSC1

4 Vp-p

250 ns

• Semiconductor Location

Ref. No. Location

D1 B-11 D1 *1 B-1 D2 B-11 D2 *1 B-1 D2 *2 G-3 D3 B-12 D3 *1 C-2 D3 *2 G-4 D4 B-12 D5 D-11 D5 *1 D-2 D6 B-11 D7 B-11 D8 B-12 D9 B-12 D10 D-12 D12 B-10

Q1 *1 B-2 Q2 *1 C-4 Q3 *1 E-2 Q4 *1 E-2 Q5 B-10 Q6 A-10 Q7 B-10 Q8 B-10 Q8 *1 B-1 Q9 B-10 Q9 *1 C-2 Q10 G-10 Q11 B-10

U1 B-11 U1 *1 D-2 U2 B-11 U3 C-11 U4 E-11 U5 C-10 U6 F-10 U7 F-10 U10 *1 C-1

Note:

no mark: Mounted on the BASE MAIN board. *1 : Mounted on the BASE RF board. *2 : Mounted on the BASE KEY board.

– 15 – – 16 –

5-4. PRINTED WIRING BOARDS – BASE UNIT Section –

SPP-901

– 17 –

– 18 –

SPP-901

5-5. SCHEMATIC DIAGRAM – BASE RF Board – • See page 29 for IC Block Diagrams.

– 19 – – 20 –

(Page 21)

5-6. SCHEMATIC DIAGRAM – BASE MAIN/BASE KEY Boards – • See page 16 for Waveform. • See page 30 for IC Block Diagrams.

SPP-901

(Page 20)

– 21 –

– 22 –

SPP-901

5-7. SCHEMATIC DIAGRAM – HAND RF Board – • See page 29 for IC Block Diagrams.

– 23 – – 24 –

(Page 26)

5-8. SCHEMATIC DIAGRAM – HAND MAIN Board – • See page 16 for Waveform. • See page 30 for IC Block Diagrams.

SPP-901

(Page 24)

– 25 –

– 26 –

SPP-901

5-9. PRINTED WIRING BOARDS – HANDSET Section –

• Semiconductor Location

Ref. No. Location

D1 D-10 D1 * D-4 D2 E-10 D2 * D-3 D3 D-9 D3 * D-3 D4 E-9 D5 B-7 D6 G-6 D7 G-6 D8 E-5 D14 G-6

Q1 E-5 Q1 * D-3 Q2 D-7 Q2 * C-2 Q3 * D-3 Q8 * D-2 Q12 C-5 Q13 B-6 Q14 F-7 Q15 G-6 Q16 B-6 Q17 F-7 Q18 F-7 Q19 D-5 Q20 D-6

U1 * H-2 U3 D-6 U3 * C-3 U5 E-6 U7 C-6 U11 F-6

Note:

no mark: Mounted on the HAND MAIN board. * : Mounted on the HAND RF board.

– 27 –

– 28 –

• IC Block Diagrams U1 U2765B-AFSG3 (BASE RF Board)

U1 U2765B-AFSG3 (HAND RF Board)

VCC2

LO REF

LO IN

GND2NCVCC3

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

LIM1 OUT

GND3

LIM2 IN

LIM2 REF

GND4

DEM NTANK

DEM TANK

DEM OUT

LOCAL OSC BUFFER

MIX

A1

1 2 3 4 5 6 7 8

NC

A1 IN

A1 REF

GND1

VCC1

MIX OUT

MIX NOUT

LIMITER

AMP

LIM1 REF

9

LIM1 IN

LIMITER

AMP

RSSI

10 11 12 13 14

RSSI

U2 TB31202BFN-EL (HAND RF Board) U10 TB31202BFN-EL (BASE RF Board)

16

1/2

1

––––––––

32, 33

1

––––––––

32, 33

FIN2

15

BUF

VCC

CP2

14

PHASE

COMPARATOR

OUTPUT

PROGRAMABLE

DIVIDER

PROGRAMABLE

DIVIDER

GND

13

SWITCH

MODULATOR

COMPARATOR

+ –

DATA OUT

SW

12

DE-

COM NIN

XIN

11

L. OSC

1/2

REFERENCE

DIVIDER

SLICER

COM IN

10

+ –

XOUT

VCC/2

SL IN

BO

9

BUF

1/2

1

FIN1

2

VCC

PHASE

COMPARATOR

OUTPUT

3

CP1

LOCK

DET

4 6

GND

5

LD

CONTROL

CIRCUIT

7

CK

DATA

8

STB

– 29 –

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

24

VCC

23

VREF

FILTER AMP 2

1

FIL2 OUT

PRE NF

PRE AMP

PRE OUT

E-RECT

22

21

– +

+ –

2

FIL2 IN

FILTER AMP 1

3

FIL1 OUT

∆G

EXP

MUTE

THROUGH

VREF

IN 2

AMP

5

COMP OUT

+ –

6

+ –

4

FIL1 IN

U7 BR93LC46F-E2 (BASE MAIN Board)

IN2

SUM AMP

– +

COMP MUTE

7

C-RECT

EXP OUT

20

19

VREF

THROUG

∆G

RIN

RO1

– +

RO1

AMP

SUM AMP

8

VREF

C-NF

– +

RO2

AMP

VREF

+ –

COMP MUTE

EXP MUTE

RO2

1718151413

16

SWITCH

CONTROL

MIC AMP

+ –

9

MIC OUT

THROUG

10

MIC NF

11

VREF

12

MIC IN

GND

U11 LP2953IM (HAND MAIN Board)

CLK

GND

1.23V

16

INPUT

15

FEEDBACK

14

5V TAP

13

VREF

12

COMP IN

11

COMP OUT

10

GND

9

1

CS

2

3

DI

DO

4

CONTROL,

CLOCK GENERATION

COMMAND

REGISTER

DUMMY

BIT

COMMAND DECODE

1

POWER SUPPLY VOLTAGE

WRITING

INHIBIT

ADDRESS

BUFFER

DATA

REGISTER

DETECTION

6BIT

16BIT

HIGH VOLTAGE

GENERATION

ADDRESS DECODER

R/W AMP

16BIT

6BIT

1,024 BIT

EEPROM

ARRAY

VCC

8

NC

7

NC

6

VSS

5

GND

OUTPUT

SENSE

SHUT DOWN

ERROR

GND

NC

2

3

4 5

DETECTION AMP

6

7

8

DROP OUT

ERROR

AMP + –

+ –

SHUT DOWN

COMPARATOR

+ –

– +

AUXILLARY

COMPARATOR

– 30 –

5-10. IC PIN FUNCTION DESCRIPTION

• BASE MAIN BOARD U6 LSC526610DW (SYSTEM CONTROLLER)

Pin No. Pin Name I/O Description

1 RESET I

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

3 to 8

9 EEP CS O Chip select signal output to the EEPROM (U7) “L”: un-select, “H”: select

10 PLL EN O

11 EEP/PLL DATA O Serial data output to the TB31202BFN (U10) and EEPROM (U7) 12 EEP DI I Serial data input from the EEPROM (U7) 13 EEP/PLL CLK O Serial data transfer clock signal output to the TB31202BFN (U10) and EEPROM (U7) 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

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 (S1) input terminal “L” is input when key pressing 22 TONE/PULSE I DIAL MODE select switch (S1) 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)

DTMF1 to

DTMF6

System reset signal input from the reset signal generator (Q8, 9) “L”: reset For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

O DTMF signal output terminal

Chip enable signal output to the TB31202BFN (U10) When PLL EN goes from “L” to “H”, it load data from PLL DATA

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

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Sony SPP-901 Service Manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

TEST MODE

ELECTRICAL ADJUSTMENTS

BASE UNIT

HANDSET

DIAGRAMS

5-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS