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

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[Switch • LED Test]

• This mode is activated when 

[ANSWER]

 key is pressed in the

Test Mode Idle status.

1.

[DIAL MODE]

 switch test

T (TONE) side : ANSWER LED ON
P (PULSE) side : ANSWER LED OFF

2.

[RINGER SELECT]

 switch test

3 (3-time terminating setting) : CHARGE/IN USE LED ON
 TS (Toll Saver)

:

CHARGE/IN USE LED OFF

ANN ONLY

:

[Dial • Auto Hold Reset • Charge Test]

• This mode is activated when 

[REPEA T]

 key is pressed in the Test

Mode Idle status.

1. Dial test

Each time 

[REPEA T]

 key is pressed, the following dial signals

are transmitted:

     “0” of PULSE 

→

 “1” of DTMF 

→

 “#” of DTMF

↑

2. Hold reset test

The ANSWER LED turns on when the hold reset detection port
is in “High” status, or turns off when “Low”. (Once the “Low”
is detected, “Low” is kept during the Test mode.)

3. Charge detection test

The CHARGE LED turns on at Charge ON, or turns off at
Charge OFF.

[C-ID Test]

• This mode is activated when 

[PLA Y/ST OP]

 key is pressed in the

Test Mode Idle status.

• ”0" is displayed on the 7-SEG LED where the public network

terminating mode is activated so as to receive a call ID.

• When a call ID was received, checksum is judged, and “1” is

displayed on 7-SEG LED if matched, or “0” is still displayed if
not matched.

3-2.

HANDSET

[Start-up method]

1. Starting with POWER ON

• Reset the POWER ON with TEST SW pin (IC501 

#™

 pin)

in “H” status, and the Test mode starts.

2. Starting from Idle status

• In the Idle status, press 

[TALK]

, 

[0]

 and 

[7]

 keys at the same

time, and the Test mode starts.

3. Operation at start-up
• When the Test mode starts, the Handset causes the ringer to sound

for 500ms, sets a channel depending on the key matrix condition
so as to be ready for receiving.
Also, the Handset sets the Liquid cristal display all turn on, the
RSSI gain to High, and goes in the Test Mode Idle status.

• For the COL0~COL3 logic of key matrix and channel setting,

refer to the frequency table.

[Operation in Test Mode Idle status]

1. RSSI monitoring

• The RSSI is always monitored at IC501 

$™

 pin (SIG-IN).

(RSSI is present: SIG-IN = “Low”, RSSI is not present: SIG-
IN = “High”)

2.

[RING ON/OFF]

 switch monitoring

• In the Test mode, the RING MODE port is always monitored

at IC501 

7

 pin (RING MODE), and if RING is ON (RING

MODE =  “High”), the buzzer volume is increased, or if RING
is OFF (RING MODE = “Low”), the buzzer volume is re-
duced.

3. Key input monitoring

In the Test Mode Idle status, key input is always monitored,
and a key touch tone is generated each time a key is pressed,
then respective modes are activated according to the key pressed.

HAND  SET  FREQUENCY  TABLE







!•

!∞

!§

!¶

RX FREQUENCY TX FREQUENCY

COL3 COL2 COL1 COL0

 (MHz)

 (MHz)

Channel

Pin No.

1CH

0

0

0

0

43.720

48.760

2CH

0

0

0

1

43.740

48.840

3CH

0

0

1

0

43.820

48.860

4CH

0

0

1

1

43.840

48.920

5CH

0

1

0

0

43.920

49.020

14CH

0

1

0

1

44.460

49.460

15CH

0

1

1

0

44.480

49.500

16CH

0

1

1

1

46.610

49.670

17CH

1

0

0

0

46.630

49.845

23CH

1

0

0

1

46.870

49.930

24CH

1

0

1

0

46.930

49.990

25CH

1

0

1

1

46.970

49.970

T1CH

1

1

0

0

43.780

48.800

T2CH

1

1

0

1

43.890

48.970

T3CH

1

1

1

0

46.800

49.910

T4CH

1

1

1

1

46.900

49.950