Handset - Sony SPP-A941 Service Manual

HANDSET

Adjustment Equipment and Connection
HAND RF Unit
RF
TP (ANT)
generator
HAND MAIN
Board
audio
TP (RECEIVER +)or
generator
TP (MIC IN)
DC 3.6 V
Setting:
1. Enter the test mode. (refer to page 13)
2. Set the channel to 6ch.
[VOL]
3. Set the 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 unit.
2. Adjust C92 on the HAND MAIN board for 926.55 MHz ± 3
kHz reading on the RF generator.
2. DEMOD Audio Level Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF unit.
2. Connect the audio generator to TP (RECEIVER +) 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.
3. MOD Deviation Adjustment
1. Connect the RF generator to TP (ANT) on the HAND RF unit.
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.
Adjustment Location:
digital
voltmeter
– 16 –
– HAND RF UNIT –
(Side B)
TP (ANT)
– HAND MAIN BOARD –
(Side A)
C92
TX Frequency
Adjustment
R113
DEMOD Audio Level
Adjustment
R119
MOD Deviation
Adjustment
TP (RECEIVER +)
TP
(MIC IN)