Sony SPP-A2770 Service manual

SPP-A2770

SERVICE MANUAL

Ver 1.1 2001.08

SPECIFICATIONS

General

Spread method

Direct-Sequence Spread-Spectrum

Access method

FDMA-TDD

Frequency band

2.4075 - 2.4720 GHz

Operating channel

40 channels

Dial signal

Tone, 10 PPS (pulse) selectable

Supplied accessories

AC power adaptor (AC-T133) Telephone line cord Rechargeable battery pack (BP-T38)

Cordless handset

Power source

Rechargeable battery pack BP-T38

Battery life

Standby: Approx. 6 days Talk: Approx. 5 hours

Battery charging time

Approx. 12 hours

Dimensions

Approx. 2 antenna excluded (approx. 58 x 166 x 48 mm)

Antenna: Approx. 2 (approx. 72 mm)

Mass

Approx. 8.1 oz (approx. 230 g), battery included

⁄8 x 6 5⁄8 x 1 15⁄16 inches (w/h/d),

⁄8 inches

Base unit

Power source

DC 9V from AC power adaptor AC-T133

Dimensions

Approx. 6 5⁄ antenna excluded (approx. 167.5 × 84 × 200 mm)

Antenna: Approx. 4 (approx. 108 mm)

Mass

Approx. 1 lb 1 oz (approx. 485 g)

× 3

⁄

× 7

⁄ 8 inches

⁄8 inches (w/h/d),

US Model

Canadian Model

Answering machine

Maximum recording time

About 20 minutes (at “NORM (LONG PLAY)” recording quality), using incorporated IC

Greeting message

Up to one minute

Incoming message

Up to 4 minutes/message

Memo

Up to 4 minutes/message

Design and specifications are subject to change without notice.

CORDLESS TELEPHONE WITH ANSWERING SYSTEM

9-873-164-02 Sony Corporation

2001H0500-1 Personal Audio Company C 2001.8 Shinagawa Tec Service Manual Production Group

SPP-A2770

Ver 1.1

1. SERVICING NOTES............................................... 3

2. GENERAL

Identifying the Parts ........................................................ 5

Registering additional cordless handsets........................ 8

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 10

3-2. Cabinet (Rear) ................................................................. 10

3-3. Hand Main Board ............................................................ 10

3-4. Base Cabinet (Lower) Assy ............................................ 11

3-5. Base Main Board............................................................. 11

4. TEST MODE

Base Unit ......................................................................... 12

Handset ............................................................................ 15

RF Testing ....................................................................... 17

5. ELECTRICAL ADJUSTMENTS

Base Unit ......................................................................... 19

Handset ............................................................................ 21

6. DIAGRAMS

6-1. Block Diagram – BASE UNIT Section –...................... 25

6-2. Block Diagram – HANDSET Section –........................ 26

6-3. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 27

6-4. Printed Wiring Board

– BASE MAIN Board (Component Side)– .................... 28

6-5. Printed Wiring Boards – BASE MAIN

(Conductor Side)/BASE MIC Boards – ......................... 29

6-6. Schematic Diagram – BASE MAIN Board (1/3) –....... 30

6-7. Schematic Diagram

– BASE MAIN (2/3)/BASE MIC Boards – ................... 31

6-8. Schematic Diagram – BASE MAIN Board (3/3) –....... 32

6-9. Printed Wiring Boards – BASE KEY Board –.............. 34

6-10. Schematic Diagram – BASE KEY Board – .................. 35

6-11. Printed Wiring Board – HAND MAIN Board – ........... 36

6-12. Schematic Diagram – HAND MAIN Board (1/2) – ..... 37

6-13. Schematic Diagram – HAND MAIN Board (2/2) – ..... 38

6-14. IC Pin Function Description ........................................... 39

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

NOTE FOR REPLACEMENT OF THE CRYSTAL VIBRATOR ON THE HAND MAIN BOARD

There are two types of crystal vibrators used on the HAND MAIN board. Accordingly, when replacing the crystal vibrator, replace the following reference number parts together. Similarly, when the following reference number parts are replaced, check which type of crystal vibrator is used and use the same type.

Crystal vibrator

X31 C12 18PF 22PF

[How to identify the TYPE A or B of crystal vibrator]

The type A or B can be identified from the initial character of a character staring indicated on the top surface of the parts.

TYPE A: Starting with a numeric value TYPE B: Staring with alphabet D

Ref. No. TYPE A TYPE B

C11 18PF 33PF

R40 1.5kΩ 1kΩ

7. EXPLODED VIEWS

7-1. Hand Set .......................................................................... 46

7-2. Base Set ........................................................................... 47

8. ELECTRICAL PARTS LIST ............................... 48

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 MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

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

SECTION 1

SERVICING NOTES

IF AN ERROR MESSAGE IS DISPLAYED (Handset)

If the following error message is displayed after the power was turned on, check the items where “1” is indicated.

SPP-A2770

ERROR=[]000

• Note on Replacing The EEPROM

After the EEPROM was replaced, write var ious parameters in the “TEST MODE E” (see page 16). (For the ID, see “Writing ID Numbers” described below)

Note: Replacing the EEPROM causes all data such as customer registered telephone directory to be cleared.

[][]

EEPROM (IC122) data error t Write correct data to the EEPROM. ID error t Write correct ID data. EEPROM

(IC122) error t Check the EEPROM and its peripheral circuits.

RE-REGISTERING ALREADY REGISTERED SET

Initialize the registered information on base unit and all handsets, and then register again all handsets starting with handset 1 by the method given below. When re-registering the handset, refer to “Registering additional cordless handsets” in the instruction manual. (see page 8)

– Base unit –

1. Turn the power on.

2. Press three keys of [1], [EZ ACCESS], and [INTERCOM] simultaneously to set the test mode.

– Handset –

1. Turn the power on.

2. Press three keys of [1], [EZ ACCESS], and [INTERCOM] simultaneously.

WRITING ID NUMBERS (for additional handsets)

The ID numbers are given in decimal notation on the bottom of base unit. If handsets are added, ID can be written in the TEST mode, but the TEST mode handles ID numbers in hexadecimal notation, thus requiring decimal numbers to be con verted into he xadecimal numbers. Accordingly, when adding the handsets, refer to “Registering additional cordless handsets” in the instruction manual. (see page 8)

However, if the EEPROM was replaced, the handsets cannot be registered by the method mentioned above. In such a case, enter various parameters except ID numbers in the “TEST MODE E”, and then register the handsets by the method given in the instruction manual. Also, the ID numbers can be written in the “TEST MODE B”(decimal number) (base unit: see page 14, handset: see page 16).

SPP-A2770

NOTE ON CONNECTING THE PANEL FOR SPP-A2780 FOR TEST MODE (Base Unit)

Some items in the test mode and electrical adjustments of this set require 12 keys for data writing, but this set does not provide 12 keys. Accordingly, the panel (BASE CABINET (UPPER) ASSY) for the SPP-A2780 is connected for these items. To connect the panel for the SPP-A2780, refer to the figure as below.

SPP-A2770 – BASE KEY BOARD (Conductor Side) –

TP306

TP302

TP336

TP301

10 12

SPP-A2780 – BASE MAIN BOARD (Component Side) –

TP307

TP305

TP337

CN302

CN703

CN702

Note 1: Do not connect CN702 on the BASE KEY board for SPP-A2780 to CN301 on the BASE MAIN board of this set. If causes troubles. Note 2: Connecting test points on the BASE MAIN board of this set and CN702 on the BASE KEY board for SPP-A2780 if not necessary when LCD

indication is not needed.

SECTION 2

GENERAL

Identifying the parts

Refer to the pages indicated in parentheses for details.

Base unit

SPP-A2770

This section is extracted from instruction manual.

1 2

5 6 7

1 CHARGE lamp (p. 14)

Lights while the battery is being charged.

2 IN USE lamp (p. 32)

Lights when the handset is in use.

3 Speaker 4 ANSWER ON/OFF button

(p. 59, 60)

Turns the answering function on or off. Lights when the answering function is on, and flashes when a new message is recorded.

5 REPEAT ./REVIEW button

(p. 61)

Press once to repeat the current message or twice to go back to the previous message.

Keep the button pressed for a playback review of the current message.

8 9 0 qa

qf qg qh

6 MESSAGE PLAY/STOP button

(p. 60)

Plays back recorded messages.

7 SKIP >/QUICK button (p. 61)

Press to skip to the next message.

Keep the button pressed for quick playback of messages.

8 ERASE button (p. 24, 63) 9 MEMO REC button (p. 65)

Records a memo message.

0 VOL – button (p. 61)

Adjusts the speaker volume.

qa VOL + button (p. 61)

Adjusts the speaker volume.

Getting Started

SPP-A2770

ql waw;

qs Message counter (p. 60, 84)

Indicates the number of new messages recorded. “An” appears in the announcement only mode. “FL” appears when there is no space to record messages. “PF” flashes when the power is turned on.

qd GREETING REC button (p. 52)

Press to record a greeting.

Getting Started

qj MIC (microphone) (p. 52, 65) qk Antenna (p. 12) ql Hook for AC power adaptor

cord (p. 12)

w; DC IN 9V jack (p. 12) wa LINE (telephone line) jack

(p. 12)

qf GREETING PLAY button (p. 53)

Plays back a greeting.

qg DAY/TIME button (p. 22)

Press to check the current time.

qh HANDSET LOCATOR button

(p. 48)

Allows you to page the handset.

continued

Getting Started

Identifying the parts (continued)

Cordless handset

4 5

7 8

9 0

SPP-A2770

wa ws

1 Antenna 2 Speaker 3 Display window (p. 32, 68) 4 TALK button (p. 32)

Lets you make or receive a call.

5 HOLD/PLAY button

(p. 33, 60, 64)

Puts a call on hold/plays back recorded messages.

6 Battery compartment (p. 14) 7 CALL WAITING/FLASH button

(p. 33, 77)

Switches to a second call if you have “call waiting” service, or lets you make a new call.

8 EZ ACCESS button (p. 23, 33)

Lets you make a call with the registered access number.

9 Jog Dial (p. 17, 39, 69) 0 OFF button (p. 32, 38)

Allows you to disconnect the call.

qa INTERCOM button (p. 50, 51)

Lets you talk between the cordless handsets (when the system has any other additional cordless handsets).

qf REPEAT . button (p. 61)

Press once to repeat the current message or twice to go back to the previous message.

qg TONE button (p. 33)

Allows you to switch temporarily to tone dialing.

qh RINGER qj I (HEADSET) jack (p. 33, 37, 78) qk VOL (volume) switch (p. 33)

Adjust the cordless handset volume.

ql SKIP > button (p. 61)

Press to skip to the next message.

w; # button (p. 75)

Used to change the number of digits of the phone number in the Caller ID list.

wa PGM (program) button

(p. 17, 39)

ws REDIAL/PAUSE button

(p. 24, 35)

Redials one of the last five numbers called/inserts a pause in the dialing sequence.

MIC (Microphone)

qs Dialing keys (p. 32) qd ERASE button

(p. 18, 41, 63)

SPP-A2770

Registering additional cordless handsets

The phone system includes a cordless handset. You can expand the system including a total of four cordless handsets. Be sure to register the ID number of the additional cordless handset called “station number” to the base unit before using the additional cordless handset. The station number of the cordless handset (supplied with the base unit) is set to 1 at the factory. The station number of the cordless telephone newly added to the system will be one of the number 2 through 4 in the order of registration.

Before you start registering, set all the unit of the system in standby mode and place them close to each other (within a distance of 12 inches). Then do the following procedure only on the additional cordless handsets one bye one.

Caution

Do not register two or three cordless handsets at the same time. Doing so may result in more than one cordless handsets having an identical station number.

Getting Started

within 12 inches

Base unit cordless handset

Press (PGM).

Press (INTERCOM). You hear a confirmation beep.

ENTER SYSTEM ID _

RING OFFMASSAGEOLDNEW

continued

Getting Started

Registering additional cordless handsets (continued)

Enter the 10 digits system ID by pressing the dialing keys.

The system ID is shown on a sticker affixed to the bottom of the base unit.

Press (PGM). You hear a long confirmation beep and

the assigned station number is displayed.

System ID

SPP-A2770

Notes

• Do not allow more than 60 seconds to elapse during the operation procedure.

• Once you add a cordless handset to the base unit system, you cannot change the station numbers, or cancel the additional registrations.

• When you press any button other than (PGM) to use an unregistered cordless handset, the message “PLEASE REGISTER THIS HANDSET” will appear on the display, and five short error beeps will be heard. You must first register the cordless handset you want to add to the system.

• If you try to register a cordless handset which you have already added to the system, the five short error beeps will be heard and the registration will be canceled.

• If the registration is unsuccessful, “ERROR” will appear on the display, and five short error beeps will be heard after (PGM) is pressed in step 4. Move all the cordless handsets closer to the base unit, and then start over the procedure.

To check the station number assigned to the additional cordless handset

The station number of the cordless handset appears on the display of the cordless handset while it is seated on the charger. You can also utilize the supplied sticker of the station number and attaching on the cordless handset. (For details, see Operating Instructions of SPP-H273.)

HANDSET 2

RING OFFMASSAGEOLDNEW

Getting Started

SPP-A2770

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SECTION 3

DISASSEMBLY

Set

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

Cabinet (rear) Hand Main Board

Base Cabinet (lower) Assy Base Main Board

3-2. CABINET (REAR)

two claws

two screws (BTP2.6 × 12)

cabinet (rear)

lid, battery case

3-3. HAND MAIN BOARD

cover (antenna. H)

button (VOL. H)

two claws

cover (head set jack)

connector (CN1)

three screws (BTP2.6

HAND MAIN boar

3-4. BASE CABINET (LOWER) ASSY

four screws (BTP3 × 10)

connector (CN172)

base cabinet (lower) assy

three connectors (CN301, 302, 303)

SPP-A2770

3-5. BASE MAIN BOARD

four screws (BTP2.6 × 8)

BASE MAIN board

two solders

SPP-A2770

SECTION 4

TEST MODE

BASE UNIT

Note:

The test mode in this set includes the test items that use normal set only, and the test items that need the panel (BASE CABINET (UPPER) ASSY) to be replaced with that for the SPP-A2780.

Items that use normal set only (Test case 1)

• TSET A

• TSET C

• TSET F

• Erase

Items that use the panel for SPP-A2780 (Test case 2)

• TSET D

• TSET E

– TEST CASE 1 –

(Items that use normal set only)

[ENTERING THE TEST MODE]

1. Turn the power on.

2. Press three keys of [GREETING REC], [HANDSET LOCATOR], and [ERASE] simultaneously.

3. When the test mode becomes active, the message counter displays “–0” along with an acknowledged tone. (Idling status of test mode)

4. Pressing either key in the following table causes the mode associated with the pressed key to be activated.

Key Mode Items

[MEMO REC] TEST A Manuf acturing mode

[GREETING REC] TEST C Electrical adjustment mode

[GREETING PLAY] TEST F DSP control mode

[ERASE] Erase Initialize the EEPROM

5. To return the idling status, press the [VOL --] key.

[RELEASING THE TEST MODE]

Disconnect the power.

[DETAIL OF EACH MODE]

1. TEST MODE A (Manufacturing mode)

In the test mode idling status, press the [MEMO REC] key to active this mode and display “–A”.

Key T est

1. In the “–A” status, press the [MEMO REC] key to active the key test.

2. Press the key following order.

[ANSWER ON/OFF]t[REPEAT ]t[MESSAGE PLAY/ STOP] t [SKIP ] t [VOL +] t [VOL --] t

[MEMO REC] t [ERASE] t [GREETING REC] t [GREETING PLAY]t[DAY/TIME]t[HANDSET LOCATOR]

3. When this test finished, a completion tone is generated and the base unit returns to the initial test mode “–A” and waits for a command. Also, pressing the keys in wrong order causes the set to be returned to the initial status.

2. TEST MODE C (TX Power Measurement Mode)

In the test mode idling status, press the [GREETING REC] ke y to active this mode and display “–C”.

1. In the “–C” status, pr ess the [REPEAT ] key to activ e the TX power measurement mode and transmit the single carrier continuously.

2. In this status, setting can be changed by entering the follo wing keys (not displayed).

[REPEAT ] : Select main antenna [SKIP ] : Select sub antenna

[GREETING PLAY] : Select channel 5 [DAY/TIME] : Select channel 28 [ANSWER ON/OFF] : Select channel 50

3. TEST MODE F (DSP Control Mode)

In the test mode idling status, press the [GREETING PLAY] key to active this mode and display “–F”.

3-1. ICM Recording Path Mode

In the “–F” status, press the [REPEAT ] key to active the ICM recording path mode. In this mode, it operates as follows.

• ICM recording path setting

• DTMF monitor

When receive DTMF, it displays corresponded number to the received DTMF

• CPT detection

When detect busy tone (400 Hz) or stutter tone, it lights up the

[IN USE] LCD.

3-2. Line Playback Path Mode

In the “–F” status, press the [SKIP ] key to active the line playback path mode. In this mode, it operates as follows.

• Line playback path setting

3-3. Recording T est

Note: Execute this test after setting the path in “3-1. ICM Recording Path

Mode”.

In the “–F” status, press the [MEMO REC] key to active the recording test. In this mode, it operates as follows.

• VOX detection

When detect receiving signal from the line, it lights up the

[ANSWER ON/OFF] LED.

Note: When receiving signal is single tone, attenuator becomes active.

Therefore use the input signal is voice signal or burst signal of sine wave (1.2 kHz).

3-4. Playback T est

Note: Execute this test after setting the path in “3-1. ICM Recording Path

Mode”.

In the “–F” status, press the [MESSAGE PLAY/STOP] key to active the playback test. In this mode, it operates as follows.

• Playback test

Playback the recorded signal by “3-3. Recording Test”.

3-5. Speaker Path Test 1

In the “– F” status, press the [GREETING REC] key to acti ve the speaker path test 1. In this mode, it activates phone line path when IC402 pin 0 (MIC GAIN CONT) is “L” and IC402 pin uj (H/S TALK GAIN CONT) is “H”.

3-6. Speaker Path Test 2

In the “–F” status, press the [GREETING PLAY] key to acti v e the speaker path test 2. In this mode, it activates phone line path when IC402 pin 0 (MIC GAIN CONT) is “H” and IC402 pin uj (H/S TALK GAIN CONT) is “L”. In this mode, it operates as follows.

• When the [VOL +] key is pressed, it outputs the DTMF “5”.

• When the [ANSWER ON/OFF] key is pressed, it outputs the

DP “0”.

SPP-A2770

4. INITIALIZE THE EEPROM

In the test mode idling status, EEPROM (IC303) and Flash memory (IC403) are all cleared except VP setting v alue when the [ERASE] key is pressed. When execute this operation, it erases stored data (phone dictionary, caller ID, message data).

– TEST CASE 2 –

(Items that use the panel for SPP-A2780)

[ENTERING THE TEST MODE]

1. Remove the panel for this set.

2. Connect the panel for SPP-A2780 as below.

SPP-A2770

BASE MAIN board

CN302

7 lead wires



test points

Note: Refer to “Note on Connecting the Panel for SPP-A2780 for Test

Mode” in the Servicing Notes. (page 4)

3. Turn the power on.

4. Press three keys of [2], [6], and [ERASE] simultaneously.

5. When the test mode becomes active, the LCD displays as below along with an acknowledged tone. (Idling status of test mode)

 

display example

SPP-A2780 BASE KEY board

(in the panel)

15 pin

CN703 CN702

JK DSP=V3 0425to FONT=NEW A2770

[DETAIL OF EACH MODE]

5. TEST MODE D (RF Control Mode)

In the test mode idling status, press the [4] key to activ e this mode and display “TEST D”.

In this mode, TX power lev el, TX power on/of f, bit error late (fix ed at OF), channel number, LQ, mode, RSSI and RXST are displayed on the LCD as below . Each setting can be changed by entering the following keys. (default: TX on, master mode)

display example

PW=Hi TXON BR=0F CH=15 LQM=3F Mst RSSI=3F STS=1101

[1] : Low ers the channel [3] : Raises the channel [4] : Turns on/off the TX [6] : Switches the mode to master/slave [7] : Switches the TX power to Lo/ML/MH/Hi [9] : Switches the antenna to main/sub (not displayed)

6. TEST MODE E (EEPROM Read/Write Mode)

In the test mode idling status, press the [5] key to activ e this mode and display as below.

display example

EEPROM ADRS= Read Dt= WriteDt=

[]: hexadecimal number (initial values are all blank)

[][][] [][][][][][][][] [][][][][][][][]

6. Pressing either key in the following table causes the mode associated with the pressed key to be activated.

Key Mode Items

[4] TEST D RF control mode [5] TEST E EEPROM read/write mode [7] TEST B Writing the ID numbers

7. To return the idling status, press the [VOL --] key.

[RELEASING THE TEST MODE]

Disconnect the power.

Refer to following table for key assignment.

Key Assignment

[0] to [9] input 0 to 9 [EZ ACCESS] input A [REDIAL/PAUSE] input B [CALL WAITING/FLASH] input C [INTERCOM] input D [HOLD] input E [SPEAKERPHONE] input F [PROGRAM] check sum [#] enter [*] reset

Enter the data associated with each address by referring to the “EEPROM data” in the following table.

Writing procedure:

1. Input the address number (3 digit) of EEPROM.

2. Press the [#] key to enter the address number and display read data (8 digit=4 byte).

3. If rewrite the data, input the rewriting data (8 digit=4 byte).

4. Press the [#] key to enter the rewriting data.

5. To release this mode, press the [VOL --] key.

6. To return the idling status, press the [OFF] key.

SPP-A2770

IF a wrong ID number was entered by mistake, press the [VOL--] key to return to the test mode idling status, then re-enter correct ID number.

EEPROM data:

Address Data (hexadecimal)

(hexadecimal) 1st byte 2nd byte 3rd byte 4th byte

754 (ID1) (ID2) F6 (C-sum) 714 81 01 00 (C-sum)

718 03 05 0C (C-sum) 71C C2 C0 00 (C-sum) 720 A9 3D 1C (C-sum) 724 48 C7 04 (C-sum) 728 50 03 51 08 72C 52 08 54 0D 730 5A 06 5D 02 734 60 0B 66 0F 738 70 07 FF 83 73C FF FF FF (C-sum) 740 FF FF FF (C-sum) 744 FF FF FF (C-sum) 690 90 E8 2A (C-sum) 694 6A AA 01 (C-sum) 794 01 00 00 (C-sum)

7. TEST MODE B (Writing the ID number)

Note: Though the “TEST MODE E” handles the ID numbers as hexa-

decimal numbers, the “TEST MODE B” handles them as decimal numbers. Both are different in numerical notation format only , and net values are same. The ID numbers written on the bottom of base unit are decimal numbers, and accordingly use the “TEST MODE B” when entering the ID numbers.

In the test mode idling status, press the [7] key to active this mode and display as below.

display example

TEST B 224****** ID=224

*: Already registered ID number

[]: Inputted ID number (initial values are all blank)

[][][][][][]

Contents of EEPROM data:

Address Data (hexadecimal)

(hexadecimal) 1st byte 2nd byte 3rd byte 4th byte

754 ID1 ID2 RF parameter C-sum 714 reserved C-sum 718 audio parameter RF parameter C-sum 71C reserved C-sum 720 RF parameter C-sum 724 audio parameter C-sum 728 72C 730 RF parameter 734 738 73C C-sum 740 reserved C-sum 744 C-sum 690 694 C-sum 794 H-No. reserved C-sum

Note:

ID1, ID2 : ID numbers in hexadecimal notation (refer to “7. TEST MODE

B”)

C-sum : Check sum value (After entering the data up to 3 bytes, press

the [PROGRAM] key to start automatic calculation.)

H-No. : Number of registered handset

audio parameter

C-sum

SPP-A2770

HANDSET

[ENTERING THE TEST MODE]

1. Connect the power.

2. Press three keys of [2], [6], and [ERASE] simultaneously.

3. When the test mode becomes active, the LCD displays as below along with an acknowledged tone. (Idling status of test mode)

display example

JK 0425to FONT=NEW A2770

4. Pressing either key in the following table causes the mode associated with the pressed key to be activated.

Key Mode Items

[1] TEST A Manufacturing mode [3] TEST C Electrical adjustment mode [4] TEST D RF control mode [5] TEST E EEPROM read/write mode [7] TEST B Writing the ID numbers

[ERASE] Erase Initialize the EEPROM

5. To return the idling status, press the [OFF] key.

[RELEASING THE TEST MODE]

Disconnect the power.

[DETAIL OF EACH MODE]

1. TEST MODE A (Manufacturing mode)

In the test mode idling status, press the [1] key to activ e this mode and display “TEST A”.

1-1. Key T est

1. In the “TEST A” status, press the [1] key to activ e the key test and display “TEST A KEY”.

2. Press the key following order.

[TALK]t[OFF]t[HOLD]t[INTERCOM]t[1]t [2]t [3]t[4]t[5]t[6]t[7]t[8]t[9]t[*]t[0]t[#]t [CALL WAITING/FLASH]t [EZ ACCESS]t[ERASE] t [REDIAL/PAUSE]t[PGM]

3. When this test finished, a completion tone is generated and the base unit returns to the initial test mode “TEST A” and waits for a command. Also, pressing the keys in wrong order causes the set to be returned to the initial status.

1-2. Jog Test

1. In the “TEST A” status, press the [2] key to acti ve the jog test and display as below.

display example

Up the jog dial : “UP” is displayed on the second line. Down the jog dial : “DN” is displayed on the second line. Press the jog dial : “P” is displayed on the second line.

1-3. LCD and LED Test

In the “TEST A” status, press the [3] key to active the LCD and LED test and display as below along with the LCD back light and key illumination LED blink alternately.

display

[NEW][OLD][MESSAGE][RING OFF]

Note: “NEW”/“MESSAGE” and “OLD”/“RING OFF” blink alternately

2. TEST MODE C (TX Power Measurement Mode)

In the test mode idling status, press the [3] key to activ e this mode and display “TEST C”.

1. In the “TEST C” status, press the [1] key to active the TX power measurement mode and transmit the single carrier continuously.

2. In this status, setting can be changed by entering the following keys (not displayed).

[1] : Set TX power to middle/low [3] : Set TX power to high [7] : Select channel 5 [8] : Select channel 28 [9] : Select channel 50

3. TEST MODE D (RF Control Mode)

In the test mode idling status, press the [4] key to activ e this mode and display “TEST D”.

display example

PW=Hi TXON BR=OF CH=15 LQM=3F Slv RSSI=3F STS=1101

[1] : Low ers the channel [3] : Raises the channel [4] : Turns on/off the TX [6] : Switches the mode to master/slave [7] : Switches the TX power to Lo/ML/MH/Hi

TEST A JOG UP

2. In this test mode, rotate the jog dial up/down or press the jog dial to respective status will be displayed on the LCD as follows.

SPP-A2770

4. TEST MODE E (EEPROM Read/Write Mode)

In the test mode idling status, press the [5] key to activ e this mode and display as below.

display example

EEPROM ADRS= Read Dt= WriteDt=

[][][] [][][][][][][][] [][][][][][][][]

[]: hexadecimal number (initial values are all blank)

Refer to following table for key assignment.

Key Assignment

[0] to [9] input 0 to 9 [HOLD] input A [INTERCOM] input B [CALL WAITING/FLASH] input C [EZ ACCESS] input D [ERASE] input E [REDIAL/PAUSE] input F [PGM] check sum [#] enter [*] reset

Enter the data associated with each address by referring to the “EEPROM data” in the following table.

Writing procedure:

1. Input the address number (3 digit) of EEPROM.

2. Press the data (8 digit=4 byte).

3. If rewrite the data, input the rewriting data (8 digit=4 byte).

4. Press the [#] key to enter the rewriting data.

5. To release this mode, press the [OFF] key.

EEPROM data:

Address Data (hexadecimal)

(hexadecimal) 1st byte 2nd byte 3rd byte 4th byte

[#] key to enter the address number and display read

004 (ID1) (ID2) F6 (C-sum) 0E0 A9 3D 1C FD 008 50 03 51 08 00C 52 08 54 0D 010 5A 06 5D 02 014 60 0B 66 0F 018 70 07 FF 83 01C FF FF FF FF 020 FF FF FF FF 024 FF FF FF FF

0D8 01 01 40 (C-sum)

Contents of EEPROM data:

Address Data (hexadecimal)

(hexadecimal) 1st byte 2nd byte 3rd byte 4th byte

004 ID1 ID2 RF parameter C-sum

0E0 C-sum

008 C-sum

00C C-sum

010 C-sum 014 RF parameter C-sum 018 C-sum

01C C-sum

020 C-sum 024 C-sum

0D8 OWN-No. H-No. M-No. C-sum

Note:

ID1, ID2 : ID numbers in hexadecimal notation (refer to “5. TEST MODE

C-sum : Check sum value (After entering the data up to 3 bytes, press

OWN-No.: Self number of handset H-No. : Number of registered handset M-No. : Number of model destination (SPP-A2770: 40h)

B”)

the [PROGRAM] key to start automatic calculation)

5. TEST MODE B (Writing the ID number)

Note: Though the “TEST MODE E” handles the ID numbers as hexa-

In the test mode idling status, press the [7] key to active this mode and display as below.

display example

TEST B 224****** ID=224

*: Already registered ID number

[]: Inputted ID number (initial values are all blank)

IF a wrong ID number was entered by mistake, press the [OFF] key to return to the test mode idling status, then re-enter correct ID number.

6. INITIALIZE THE EEPROM

In the test mode idling status, EEPROM (IC122) is all cleared except VP setting value when the [ERASE] key is pressed. When execute this operation, it erases stored data (phone dictionary, caller ID, message data).

[][][][][][]

SPP-A2770

Ver 1.1

RF TESTING

This test is for checking the RF system without disassembling the set in servicing. Perform measurement using the spectrum analyzer and jig antenna.

Note:

To perform the RF testing, prepare the panel (BASE CABINET (UPPER) ASSY) for SPP-A2780, and use it connecting the panel for SPP-A2780. (Refer to page 4)

RF T esting method:

Please follow the below instruction to perform RF test.

For the detail of test mode, Refer to the each items of “BASE UNIT” section and “HANDSET” section.

1. TRANSMISSION CHECK

1-1. Setting

Connect a receiving antenna to RF INPUT of Spectrum analyzer and set the unit 10 cm (4 inches) away from the receiving antenna.

Measuring tool: Spectrum analyzer (equivalent to HP8595E) Jig : Receiving antenna (for Spectrum analyzer)

10 cm

Test mode setting:

– Base Unit –

1. Press three keys of [2], [6], and [ERASE] simultaneously to enter the test mode.

2. Press the [4] key to activate test mode D and display “TEST D”. (TX on)

3. Press the [1] or [3] key to change the channel to 28.

– Handset –

1. Press three keys of [2], [6], and [ERASE] simultaneously to enter the test mode.

2. Press the [4] key to activate test mode D and display “TEST D”. (TX on)

3. Press the [6] key to set master.

4. Press the [1] or [3] key to change the channel to 28.

Test mode setting is complete, check that the waveform on spectrum analyzer is displayed as below.

REF 0.0 dBm 10dB/

A_View B_Blank NormNorm

Spectrum analyzer

Jig antenna (Utilize the antenna for handset)

10 cm

Spectrum analyzer

1-2. Transmission W aveform Check

Purpose:

It is necessary to check spectrum wave of transmission wav e which is an important factor in order to confirm operational performance of Spread Spectrum models. If this wave deviates from correct wave form, normal data transmission cannot be made and, as a result of that, possibility that occurrence of mute increases and communication distance becomes shorter will increase.

Spectrum analyzer setting:

Center frequency: 2440.5 MHz Span : 10 MHz RBW : 100 kHz VBW : 100 kHz Ref Level : 0 dBm ATT : 10 dB

CENTER 2.44050 GHz *RBW 100 kHz *VBW 100 kHz *ATT 10dBSWP 20 ms

SPAN 10.00 MHz

Measuring:

1. Maximum hold the waveform.

2. Set the maker to the peak of waveform with the Peak Search function.

3. Measure the frequency width of points 6 dB and 20 dB lower from the peak with the Delta Marker function. (refer to below figure)

REF 0.0 dBm MK∆ –510 kHz 10dB/ A_View B_Blank Norm –5.44 dBPosi

DELTA MKR – 510 kHz

PEAK

CENTER 2.44050 GHz *RBW 100 kHz *VBW 100 kHz *ATT 10dBSWP 20 ms

–6dB

–20dB

SPAN 10.00 MHz

Specifications:

A (width of –6 dB points) : more than 1.4 MHz B (width of –20 dB points) : more than 1.8 MHz

+ 39 hidden pages

Sony SPP-A2770 Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

3-1. DISASSEMBLY FLOW

DISASSEMBLY

Cabinet (rear) Hand Main Board

cabinet (rear)

base cabinet (lower) assy

BASE MAIN board

TEST MODE

BASE UNIT

HANDSET

RF TESTING