Sony SPP-A941 - Cordless Telephone With Answering System, Руководство по обслуживанию

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Setting:
1. Enter the test mode. (refer to page 13)
2. Set the channel to 6ch.
3. Set the
[VOL]
switch (S19) to the “L” position.
4. Disconnect the microphone (U9) wire at the HAND MAIN
board.
1. TX Frequency Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF board.
2. Adjust C92 on the HAND MAIN board for 926.55 MHz ± 3
kHz reading on the RF generator.
2. Quad-Voltage Adjustment
1. Connect the digital voltmeter to TP (RX AUDIO) on the HAND
MAIN board.
2. Adjust C25 on the HAND RF board for 1.6 ± 0.075 Vdc read-
ing on the digital voltmeter.
3. DEMOD Audio Level Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF board.
2. Connect the audio generator to TP (RE) on the
HAND MAIN board.
3. Set the RF generator as follows.
output frequency : 903.8 MHz
output level : –50 dBm
FM deviation : 25 kHz
MOD tone frequency : 1 kHz
4. Adjust R113 on the HAND MAIN board for –90 ± 5 mV read-
ing on the audio generator.
4. MOD Deviation Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF board.
2. Connect the audio generator to TP (MIC IN) on the HAND
MAIN board.
3. Set the audio generator as follows.
output level : 35 mV
output frequency: 1 kHz
4. Adjust R119 on the HAND MAIN board for 25 ± 3 kHz read-
ing on the RF generator.
HANDSET
Adjustment Equipment and Connection
HAND RF Board
TP (ANT)
RF
generator
HAND MAIN
Board
TP (RE)or
TP (MIC IN)
TP (RX AUDIO)
audio
generator
DC 3.6 V
digital
voltmeter
Adjustment Location:
C92
TX Frequency
Adjustment
TP (RE)
TP
(MIC IN)
TP
(RX AUDIO)
R113
DEMOD Audio Level
Adjustment
R119
MOD Deviation
Adjustment
C25
Quad-Voltage
Adjustment
TP (ANT)
– HAND RF BOARD –
(Side B)
– HAND MAIN BOARD –
(Side A)