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16
(O)
Audio Check and
Confirmation
-
1. Link to BASE which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm(600
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm(600
)/1 kHz to MIC of Handset. Measure the Level at Line I/F
and distortion level.
4. Confirm that the level is -0.2 dBm and that the distortion level is <5% at TEL
Line (600
Load).
5. Input -20 dBm(600
)/1kHz to Line I/F. Measure the Level at Receiver of
Handset and distortion level (Receive volume set to second position from
minimum).
minimum).
6. Confirm that the level is -24 dBm and that the distortion level is <5% at
Receiver (34
Load).
IC1, C12, C96,
C97, R215,
R27, RA4,
C11, C13,
R28, MIC
(P) SP phone Audio Check
and Confirmation
-
1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -30 dBm(600
2. Set line voltage to 48 V and line current to 50 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -30 dBm(600
)/1KHz to Line I/F and measure Receiving level at SP+
and SP-.
5. Confirm that the level is -8 dBm and that the distortion level is < 5%.
(Val = Max at SP (8
Load))
IC1, C12, C73,
D13, D14,
MIC, C11,
C13, RA4,
R27, R28,
C96, C97,
C96, C97,
R215, C72,
C73
(Q)
Charge Pump 3.0V
Supply Confirmation
CP3.0V
1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0V±0.3V.
C704, C53,
C54
(R)
Charge Pump CPV2
4.0V Supply
Confirmation
CPV2
1. Confirm that the voltage between testpoint CPV2 and GND is 4.0V ±0.3V.
(Power is supplied when LED in on)
C52, C55
(S)
Charge Pump CP2.8V
Supply Confirmation
CP2.8V
1. Confirm that the voltage between testpoint CPV2.8V and GND is 2.8V ±0.3V.
C49, C53,
C54, D3, C51
(T)
Headset Audio Check
and Confimation
-
1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 50 mA.
3. Input -45 dBm (600
2. Set line voltage to 48V and line current to 50 mA.
3. Input -45 dBm (600
)/1 kHz to MIC of Headset. Measure the Level at Line I/F
and distortion level.
4. Confirm that level is -7.5 dBm ± 3 dBm and that the distortion level is <5% at
TEL Line (600
Load) .
5. Input -20 dBm(600
)/1 KHz to Line I/F. Measure the Level at Receiver of
Headset and distortion level (Receive volume set to second position form
minimum) .
minimum) .
6. Confirm that the level is -21.5 dBm ± 3 dBm and that the distortion level is < 5%
at Headset Receiver (150
Load).
IC1, R29, C16,
C184, R22,
C14, R25, L9,
C86, C83,
C32, R306,
L72, L74,
C185, C110,
CN4
Items
Check
Point
Procedure
Check or
Replace Parts
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