Sony SPP-SS950 Service manual

SPP-SS950

SERVICE MANUAL

Ver 1.2 2000. 06 With SUPPLEMENT-1 (9-925-727-81)

SPECIFICATIONS

General

Spread method Direct-Sequence Spread-Spectrum Access method FDMA-TDD Frequency band 902 – 928 MHz Operation channel 20 channels Supplied Accessories AC power adaptor AC-T37 (1) (US model)

AC power adaptor AC-T47 (1) (E model) Telephone line cords (2) (US model) Telephone line cord (1) (E model) Rechargeable battery pack BP-T18 (1) Directories (2 sheets) Wall bracket/stand (1) Screws (2) (E model)

US Model

E Model

Base unit

Power source DC 9V from AC power adaptor Battery charging time Approx. 12 hours Dimensions Approx. 128 × 58 × 208 mm (w/h/d), antenna

excluded Antenna: 165 mm

Mass Approx. 320 g, wall bracket excluded

Design and specifications are subject to change without notice.

Handset

Power source Rechargeable battery pakc BP-T18 Battery life Standby: Approx. 7 days (RING ON mode)

Approx. 3 weeks (BATT SAVE mode)

Talk: Approx. 4 hours

Dimensions Approx. 58 × 177 × 46 mm (w/h/d), antenna

excluded Antenna: 72 mm

Mass Approx. 250 g, battery included

CORDLESS TELEPHONE

MICROFILM

TABLE OF CONTENTS

SERVICING NOTES

1. GENERAL

Setting up the phone ........................................................3

Making and receiving calls.............................................. 3

Speed dialing ................................................................... 4

Paging .............................................................................. 4

Mounting the base unit on a wall .................................... 4

2. DISASSEMBLY..........................................................5

3. 900MHz SYSTEM OPERATION

3-1. Access method ................................................................. 7

3-2. Protocol............................................................................7

4. TEST MODE

4-1. Base Unit Test Mode A.................................................... 10

4-2. Base Unit Test Mode B....................................................10

4-3. Handset Test Mode .......................................................... 1 1

5. ELECTRICAL ADJUSTMENTS

5-1. Base Unit Section ............................................................ 12

5-2. Handset Section ...............................................................13

6. DIAGRAMS

6-1. Schematic Diagram – Base Unit Section –...................... 16

6-2. Printed Wiring board – Base Unit Section – ................... 19

6-3. Printed Wiring Board – Handset Section –...................... 21

6-4. Schematic Diagram – Handset Section – ........................ 23

6-5. IC Pin Function Description ............................................26

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or

unsoldering

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.

SAFETY-RELATED COMPONENT WARNING!!

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

7. EXPLODED VIEWS ................................................ 30

8. ELECTRICAL PARTS LIST................................ 32

– 2 –

SECTION 1

GENERAL

This section is extracted from instruction manual.

– 3 –

– 4 –

SECTION 2

DISASSEMBLY

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

REAR CABINET

two screws (BTP 2.6 × 10)

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

Remove the rear cabinet to direction of the arrow B.

claw

two claws

– 5 –

HAND MAIN BOARD

screw (BTP 2.6 × 8)

connector

HAND MAIN board

four screws (P 3 × 16)

connector

three screws (BTP 2.6 × 8)

LOWER CABINET

two screws (BTP 2.6 × 8)

lower cabinet

two claws

two screws (BTP 2.6 × 8)

– 6 –

SECTION 3

900MHz SYSTEM OPERATION

3-1. ACCESS METHOD

1. Transfer format & rate

The transfer format & rate of our system is as follows;

Table 3-1. Transfer method

Access method FDMA-TDD Channel number 20 channel Channel spacing 1.2MHz Modulation method DBPSK Baseband transfer rate 960Kbps Spread method Direct Sequence Spread Spectrum Chip rate 12 chips/bit Data transfer rate 80 Kbps

2. Channel Number & Frequencies

RF channels occupy the frequency band 902 – 928 MHz are numbered 1 to 20. RF channel numbers & center frequencies are specified as follows.

Table 3-2. Channel number & Channel frequency

Channle Channel Center Channel Channel Center Number Frequency (MHz) Number Frequency (MHz)

1 903.6 11 915.6 2 904.8 12 916.8 3 906.0 13 918.0 4 907.2 14 919.2 5 908.4 15 920.4 6 909.6 16 921.6 7 910.8 17 922.8 8 912.0 18 824.0 9 913.2 19 925.2

10 914.4 20 926.4

3-2. PROTOCAL

1. General

This system realizes the TX/RX superframe by TDD system. The relation of master/slave dose not decide identification regarding the protocol between BS and HS, but the initiated side is the master and the requested side is the slave when the RF link has been established.

2. Initial acquistition

In order to establish the RF link between BS and HS, both of BS and HS need to have the same system ID. When “power” is applied to this system, the system have to do Initial Acquisition in order to have the same system ID. It si to exchange a parameter when the HS is parked on the BS, as soon as the system do System Parameters Re-initilization.

3. System parameter re-initilization

This System Parameters Re-initilization can realize that the HS is parked on the BS. So after the BS recoginized to be parked the HS, the BS calculates a system parameter, and then it outputs this data from the ARTO port, and then the system establishs the RF link. In order to establish this link, the HS send the A-Frame to the BS after the HS received the system parameter, and then the BS send the A-Frame to the HS. The process of System Parameters Re-initilization is as follows.

Base Station Handset

(PARK)

(Park Detect)(Park Detect)

System Parameters

A-Frame

System ID

confirmed

A-Frame

Fig. 3-1. System Parameters Re-initialization

System ID

confirmed

– 7 –

4. Stand-by Mode Operation

(1) HS

When the HS is the stand-by mode (sleep mode), the HS do the intermittent operation for power save, because the HS is the battery operation. This process of stand-by mode operation is as follows.

10 sec

Heart-Beat

10 sec

Heart-Beat Heart-Beat

RX RX RX RX RX

1 sec 1 sec

10 sec

1 sec

2 msec

2 msec 10 msec

10 msec

RXTXRX

Heart Beat (Exchange A-Frame for Link confirmation purpose)

Fig. 3-2. Stand-by mode operation (HS)

(2) BS

The BS is supplied the power by AC line. While the BS is the stand-by, the BS is always a wake state. While the BS monitors the current channel, the BS monitors also the other channel at the same time Because if the current channel can not use by some interference, the system needs the clear channel information as a part of system parameter for a channel hop. If the BS can not receive the A-Frame of Heart-beat from the HS, it become “link error”, and the system become error recovery mode.

– 8 –

5. Link Establishment

Accoding to the following Fig. 3-1, the requested side for link establishment is the master. The system have to exchange the A-Frame for link establishment, and each system ID should be the same ID, and then the system link is established. The protocol and timing chart of link establishment are as follows.

Master Slave

A-Frame

System ID

confirmed

Fig. 3-3. Link Establishment protocol

A-Frame V-Frame V-Frame V-Frame V-Frame

System ID

confirmed

Master

Time Slot

Master TX

Master RX

Slave RX

Slave TX

Trip Delay

TX RX TX RX TX

A' V

Fig. 3-4. Link Establishment Timing Chart

6. State Change/Tarmination

After the RF link between HS and BS was established, a movement of each state (State: ON-Hook, OFF-Hook, P A GE, InterCom, etc) is sent through supervisory bits.

VA'

7. Error Recovery

In case of the following situation, The system becomes “Error Recovery Mode”.

(1) The system failed to move to “Heart-Beat” during “Stand-by

mode, or failed “link establishment”.

(2) The system failed to keep the link.

– 9 –

SECTION 4

TEST MODE

4-1. BASE UNIT TEST MODE A

[Start-up]

1. Set [DIALMODE] switch to the P (PULSE) side.

2. With [PAGE] button kept pressed, reset the POWER ON (connect the A C adapter plug) and return [DIALMODE] switch from P (PULSE) side to T (TONE) side, then again to the P (PULSE) side.

3. Release the [PAGE] button, and the Test Mode A will start.

4. When the Test Mode A started, the Dial Test is carried out.

5. If [DIALMODE] switch is changed over from P (PULSE) to T (TONE) side, the base set goes in Test Mode Idle A status.

[Dial Test]

1. When the Test Mode started, a line is connected.

2. “0” is output with 10pps (PLUSE) signal.

3. After 2 seconds, “1” “4” “8” “#” are output with DTMF (TONE) signals.

4. Then, the line is placed in the busy status.

[TDD Test Mode on Each Channel]

1. In the Test Mode Idle A status, the statused of respectiv e blocks are as follows: Radio block – TDD mode (Master timing, 1CH) Audio block – Line busy status

2. Each time [PAGE] button is pressed, channels are changed ov er as follows:

4-2. BASE UNIT TEST MODE B

[Start-up]

1. Set [DIALMODE] switch to the T (TONE) side.

2. With [PAGE] button kept pressed, reset the POWER ON (connect the A C adapter plug) and return [DIALMODE] switc h from T (TONE) side to P (PULSE) side, then again to the T (TONE) side.

3. Release the [PAGE] button, and the Test Mode B will start.

4. In the Test Mode B, two kinds of idle statuses can be selected depending on the[DIALMODE] switch setting.

DIAL MODE switch Idle statuses

T (TONE) side Test Mode Idle B-1 *1

P (PULSE) ise Test Mode Idle B-2 *2

*1: Radio block – TDD mode (Master timing)

Audio block – Line busy status

*2: Radio block – Standby status

Audio block – Line open

[Charging Detection Test, ARTO Pin Output Test, and EEPROM Clear]

1. In the Test Mode Idle B-1 status, if charging is detected, a rectangular wave of 2.4 kHz is output from the IC751 Pin #¢ (ART0 pin).

2. At this time, the contents of the EEPROM memory are all clearered.

Test Mode Idle A → 2CH → 3CH → 4CH → . . . → 20CH (1CH)

↑

3. On the channels 2 to 20, the statuses of respective blocks are as follows: Radio block – TDD mode (Slave timing) Audio block – Line busy status

[Charging Detection Test, ARTO Pin Output Test, and EEPROM Clear]

1. In the Test Mode Idle A status, if charging is detected, a rectangular wave of 2.4 kHz is output from the IC751 Pin #¢ (ARTO pin).

2. At this time, the contents of the EEPROM memory are all cleared.

[Terminating Signal Detection Test]

1. In the Test Mode Idle B-2 status, if a terminating signal is

detected, H → L → . . . are output from the IC751 Pin *ª in synchronization with H → L → . . . of terminating signal detected.

[Continuous Receive Mode, Continuous Transmit Mode and TDD Test Mode with High, Mid, and Low Power]

In the T est Mode Idle B-2 status, each time [PAGE] button is pressed, the mode changes as follows:

[PAGE] button

pressing times

1 CONT. RECEIVE (1CH, LNA ON, AGC ON) 2 CONT. RECEIVE (10CH, LNA ON, AGC ON) 3 CONT. RECEIVE (20CH, LNA ON, AGC ON) 4 CONT. TRANSMIT (1CH, High power) 5 CONT. TRANSMIT (1CH, Mid power) 6 CONT. TRANSMIT (1CH, Low pwer) 7 CONT. TRANSMIT (10CH, High pwer) 8 CONT. TRANSMIT (10CH, Mid pwer)

9 CONT. TRANSMIT (10CH, Low pwer) 10 CONT. TRANSMIT (20CH, High pwer) 11 CONT. TRANSMIT (20CH, Mid pwer) 12 CONT. TRANSMIT (20CH, Low pwer) 13 TDD Mode (Master timing, 1CH, High power) 14 TDD Mode (Master timing, 1CH, Mid power) 15 TDD Mode (Master timing, 1CH, Low power) 16 Return to Test Mode Idle B-2

* In the statuses of 1 – 15, the audio block is placed in the line busy status.

Radio Block

– 10 –

+ 21 hidden pages