Sony SPP-S2730 - Cordless Telephone, Service Manual

Page: 20 / 56

20
SPP-S2730
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dBm = 0.775 V
BASE UNIT
•
Make the set in the test mode. (See page 13)
1. Power Failure Test
Procedure:
1. Connect between TP338 and TP306 (GND) on the BASE
MAIN board by lead wire.
2. In the test mode idling status, press the
[1]
key to display
“TEST A”.
3. Check that the
[NEW CALL]
LED on the base unit lights up
when connect between TP203 and TP306 (GND) on the BASE
MAIN board.
2. Ring Detection Test
Procedure:
1. In the “TEST A” status, connect the base unit to telephone
line.
2. Check that the LCD back light on the base unit lights up when
call the base unit.
3. Line Closing of Parallel Connected Another Tel-
ephone Detection (On Hook) Test
Procedure:
1. In the “TEST A” status, connect the base unit to telephone
line.
2. Connect this set and another telephone in parallel to one tel-
ephone line.
3. Check that the
[NEW CALL]
LED on the base unit lights up
when take up the receiver of another telephone.
4. Automatically Hold Canceling Test
Procedure:
1. In the test mode idling status, press the
[4]
key to display
“TEST D”.
2. Connect the base unit and another telephone in parallel to one
telephone line.
3. Take up the local handset of base unit, and press the
[HOLD]
key to hold.
4. Check that the
[NEW CALL]
LED on the base unit lights up
when take up the local handset of another telephone.
5. C-ID Input Level Measurement
Setting:
Procedure:
1. Connect equipments as the figure above.
2. In the test mode idling status, press the
[6]
key to display
“TEST F”.
3. Set the output level of audio analyzer to –17 dBm (1.2 kHz,
LPF=30 kHz ON).
4. Check that the value of audio analyzer is –15 to –21 dBm.
5. Between Microphone and Line Signal Level
Measurement
Setting:
Procedure:
1. Connect equipments as the figure above.
2. In the test mode idling status, press the
[6]
key to display
“TEST F”, and press the
[5]
key to set the speaker path test 2
mode.
3. Set the output level of audio analyzer to –27 dBm (1.2 kHz,
LPF=30 kHz ON).
4. Check that the value of audio analyzer is –2 to –8 dBm.
5. Press the
[VOL --]
key to return the test mode idling status.
Press the
[6]
key to display “TEST F” again, and press the
[4]
key to set the speaker path test 1 mode.
6. Change the output level of audio analyzer to –36 dBm.
7. Check that the value of audio analyzer is –2 to –8 dBm.
7. Between Line and Speaker Signal Level Measure-
ment
Setting:
Procedure:
1. Connect equipments as the figure above.
2. In the test mode idling status, press the
[6]
key to display
“TEST F”, and press the
[4]
key to set the speaker path test 1
mode.
3. Set the output level of audio analyzer to –27 dBm (1.2 kHz,
LPF=30 kHz ON).
4. Check that the value of audio analyzer is –2 to –8 dBm.
Base unit feeding bridge
Trunk
Line
Line
Input
TP101
TP102
TP413
TP306 (GND)
GND
Output
audio analyzer
1.2 kHz, –17 dBm
LPF: 30 kHz ON
10
µ
F
Base unit feeding bridge
Trunk
Line
Line
Output
TP101
TP102
TP475
TP306 (GND) GND
Input
audio analyzer
1.2 kHz, –27 dBm
LPF: 30 kHz ON
600
Ω
+
100
µ
F
100
µ
F
Base unit feeding bridge
Trunk
Line
Line
Input
TP101
TP102
TP476
TP477 (SP GND) GND
Output
audio analyzer
1.2 kHz, –27 dBm
LPF: 30 kHz ON
16
Ω