– 17 –
• Make the set in test mode. (See page 14)
• Remove the solder of the BP (ANT) on the HAND MAIN board
when performing adjustments. After completing the adjustments,
short the BP (ANT) by solder.
– TX Adjustments –
1. TX Power Adjustment
Setting:
Procedure:
1. Connect a power meter to TP (ANT) and TP (GND) on the
HAND MAIN board.
2. Adjust RT501 on the HAND RF board so that the value of
power meter becomes –6.5 dBm.
2. TX Frequency Adjustment
Setting:
Procedure:
1. Connect a frequency counter to TP (ANT) and TP (GND) on
the HAND MAIN board.
2. Restart the test mode to change the channel to 21CH.
3. Adjust CT601 on the HAND MAIN board so that the value of
frequency counter becomes 926.997467 MHz.
3.
Modulation Sensitivity Adjustment
Setting:
Procedure:
1. Disconnect the microphone (MC601) on the HAND MAIN
board.
2. Connect an AF OSC to TP (MIC+) and TP (MIC–) on the
HAND MAIN board.
3. Connect a deviation meter to TP (ANT) and TP (GND) on the
HAND MAIN board.
4. Press the
[2]
key to change the test mode step to TX MOD
CHECK.
5. Adjust RT603 on the HAND MAIN board so that the value of
deviation meter becomes
±
8 kHz modulation.
HANDSET
+
–
power meter
TP (ANT)
TP (GND)
+
–
frequency counter
TP (ANT)
TP (GND)
AF OSC
1 kHz, 9 mV
+
–
TP (MIC+)
600
Ω
TP (MIC–)
+
–
deviation meter
TP (ANT)
TP (GND)
– RX Adjustments –
1. DISCRI Voltage Adjustment
Setting:
Procedure:
1. Connect a SSG to TP (ANT) and TP (GND) on the HAND
MAIN board.
2. Connect a digital voltmeter to TP (DISCRI) and TP (GND) on
the HAND MAIN board.
3. Press the
[4]
key to change the test mode step to RX SENS.
4. Adjust L602 on the HAND MAIN board so that the value of
digital voltmeter becomes 0.95 V.
2. Speaker Out Level Adjustment
Setting:
Procedure:
1. Change the modulation of SSG to 1 kHz,
±
8 kHz deviation.
2. Disconnect the speaker (SP801).
3. Connect a noise meter to TP (SP1) and TP (SP2) on the HAND
MAIN board.
4. Set the
[VOL]
switch (S601) to
[M]
position.
5. Adjust RT602 on the HAND MAIN board so that the value of
noise meter becomes –18.5 dBV.
SSG
Carrier frequency: 926.997467 MHz
Modulation: no modulation
Output level: – 47 dBm
TP (ANT)
TP (GND)
+
–
digital voltmeter
TP (DISCRI)
TP (GND)
SSG
Carrier frequency: 926.997467 MHz
Modulation: 1 kHz,
±
8 kHz deviation
Output level: – 47 dBm
TP (ANT)
TP (GND)
TP (SP1)
TP (SP2)
150
Ω
noise meter
+
–
Summary of Contents for SPP-933 - 900mhz Cordless Telephone
Page 3: ... 3 SECTION 1 GENERAL This section is extracted from instruction manual ...
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Page 27: ... 35 SPP 933 934 5 10 SCHEMATIC DIAGRAM BASE KEY Section Page 32 ...
