Sony SPP-A400 - Cordless Telephone With Answering Machine, Service Manual

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SECTION  3

TEST  MODE

[Radio System Test]

• This mode is activated when 

[GREETING]

 key is pressed in the

Test Mode Idle status.

1.

Operation in Radio System Test mode

• In the Radio System Test mode, the RSSI is always moni-

tored at IC601 

#•

 pin (SIG-IN), and if RSSI is present (SIG-

IN =”Low”), the ANSWER LED turns on, or if RSSI is not
present(SIG-IN = “High”), the LED turns off.

• Current channel number is displayed on 7-SEG LED.

2.

Operation by key input

• In the Radio System Test mode, the base unit always moni-

tors the key inputs, and generates a key touch tone and goes
in  the following statuses according to each key pressed.

[PAGE]

 key

• Radio channel is incremented by one.
• TX ON/OFF and RX ON/OFF are same as the condition before

the channel was incremented by one.

• Channel number and 7-SEG LED display vary as follows:

1CH 

→

2CH 

→

 . . . . 

→

 19CH 

→

 20CH

“1”

“2”

“19”

“0”

↑

↓

T4CH 

←

 . . . . 

←

 T1CH 

←

 25CH 

←

 . . . . 

←

 21CH

“9”

“6”

“5”

“1”

[ANSWER ON/OFF]

 key

• Transmit mode is turned on.
• Even in the condition other than transmit mode, key input be-

comes active to turn on the transmit mode.

[GREETING]

 key

• Receive mode is turned on.
• Even in the condition other than receiver mode, key input be-

comes active to turn on the receive mode.

[TIME]

 key

• Transmit & receive mode is turned off.
• Even in the condition other than transmit & receive mode, key

input becomes active to turn off the transmit & receive mode.

[SET/REC]

 key

• RSSI gain is set to “Low”.

(Once the gain is set to “Low”, low gain is kept during the Test
mode.)

[MEMO]

 key

• Message transmission test
• ID=AAAH and DATA=AAAH in length of frame sync + normal

message frame length are transmitted continuously until 

[MEMO]

key is pressed again. When 

[MEMO]

 key is pressed, a message

transmission is stopped, and TX ON/OFF and RX ON/OFF are
returned to the condition before the message transmission.

[ERASE]

 key

• Test Mode Idle status is resumed.
• The Radio System Test mode quits, and the Test Mode Idle sta-

tus is resumed.

3-1.

BASE UNIT

[Start-up method]

1. Set the 

[DIAL MODE]

 switch to the P (PULSE) side.

2. Reset the POWER ON (connect the AC adapter plug) while

pressing 

[TIME]

, 

[REPEA T]

, 

[PLA Y/ST OP]

 keys.

3. Set the 

[DIAL MODE]

 switch to the T (TONE) side. After that

back to the P (PULSE) side.

4. Using the signal in step 3 as a trigger, the base unit reads chan-

nel information with the key matrix, and starts the Test mode.

 5. After the Test mode started, the base unit generates a comple-

tion tone, then based on the read channel information, it sets
the channel and goes in Test Mode Idle status under the follow-
ing conditions:
• Relay ON (receiving status)
• 7-SEG LED  “c” display
• RSSI gain  HIGH

* For the DB0~DB4 logic of key matrix and channel setting, refer

to the frequency table.

[Operation in Test Mode Idle status]

In the Test Mode Idle status, the base unit always monitors the key
inputs, and generates a key touch tone and goes in the following
modes according to each key pressed.
•

[GREETING]

 key ................. Radio System Test

•

[TIME]

 key .......................... Audio System Test

•

[SET/REC]

 key .................... Key • LED • Terminating Test

•

[ANSWER ON/OFF]

 key ...... Switch • LED Test

•

[REPEAT]

 key ..................... Dial • Auto Hold Reset • Charge

Test

•

[PLAY/STOP]

 key ................ C-ID Test

•

[ERASE]

 key ....................... Test Mode Quit

The base unit quits Test mode and goes in Idle status.

BASE  UNIT  FREQUENCY  TABLE

5

4

3

2

1

TX FREQUENCY RX FREQUENCY

DB4

DB3

DB2

DB1 DB0

 (MHz)

 (MHz)

Channel

Pin No.

1CH

0

0

0

0

0

43.720

48.760

2CH

0

0

0

0

1

43.740

48.840

3CH

0

0

0

1

0

43.820

48.860

4CH

0

0

0

1

1

43.840

48.920

5CH

0

0

1

0

0

43.920

49.020

6CH

0

0

1

0

1

43.960

49.080

7CH

0

0

1

1

0

44.120

49.100

8CH

0

0

1

1

1

44.160

49.160

9CH

0

1

0

0

0

44.180

49.200

10CH

0

1

0

0

1

44.200

49.240

11CH

0

1

0

1

0

44.320

49.280

12CH

0

1

0

1

1

44.360

49.360

13CH

0

1

1

0

0

44.400

49.400

14CH

0

1

1

0

1

44.460

49.460

15CH

0

1

1

1

0

44.480

49.500

16CH

0

1

1

1

1

46.610

49.670

17CH

1

0

0

0

0

46.630

49.845

18CH

1

0

0

0

1

46.670

49.860

19CH

1

0

0

1

0

46.710

49.770

20CH

1

0

0

1

1

46.730

49.875

21CH

1

0

1

0

0

46.770

49.830

22CH

1

0

1

0

1

46.830

49.890

23CH

1

0

1

1

0

46.870

49.930

24CH

1

0

1

1

1

46.930

49.990

25CH

1

1

0

0

0

46.970

49.970

T1CH

1

1

0

0

1

43.780

48.800

T2CH

1

1

0

1

0

43.890

48.970

T3CH

1

1

0

1

1

46.800

49.910

T4CH

1

1

1

0

0

46.900

49.950