Handset Section - Sony SPP-M920 Service Manual
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Also See for SPP-M920:
- Operating instructions manual (72 pages) ,
- Operating instructions manual (72 pages)
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5-2. HANDSET SECTION
• Set to handset test mode.
• Perform the adjustment at 5CH (RX : 903.5MHz, TX :
926.25MHz) by removing C115 as a rule.
1. RX LOOP VOLTAGE Adjustment
Procedure :
1. Connect the FM rf signal generator to ANTENNA point.
FM rf signal generator condition :
Carrier frequency
Modulation
Deviation
Output level
2. Connect the digital voltmeter to RX LOOP V (ATE terminal).
3. Adjust the C88 for 1.2V ± 0.2V reading on the digital voltmeter.
2. TX LOOP VOLTAGE Adjustment
Procedure :
1. Connect the digital voltmeter to TX LOOP V (ATE terminal).
2. Adjust the C49 for 1.2V ± 0.12V reading on the digital voltme-
ter.
3. 18.25MHz CLOCK REFERRENCE Adjustment
Procedure :
1. Connect the frequency counter to IC11 (^™ pin).
2. Adjust the C103 for 18.25MHz ± 750Hz reading on the frequency
counter.
Connetion P oints :
[HAND MAIN BOARD] (SIDE A)
C1
C115
ANTENNA point : FM rf signal generator or modulation meter
C115
Adjustments Location :
[HAND MAIN BOARD] (SIDE A)
: 903.5MHz
: 1kHz
: ± 25kHz
: – 70dBm (EMF)
74
75
80
84
1
5
11
12
IC1
R114 : TX DEVIATION Adjustment
C49 : TX LOOP VOLTAGE Adjustment
C88 : RX LOOP VOLTAGE Adjustment
4. QUAD-TUNE VOLTAGE Adjustment
Procedur e :
1. Connect the FM rf signal generator to ANTENNA point.
FM rf signal generator condition :
Carrier frequency
Modulation
Deviation
Output level
2. Connect the digital voltmeter to QUAD-TUNE (ATE terminal)
3. Adjust the C87 for 1.2V ± 0.75V reading on the digital voltme-
ter.
5. TX DEVIATION Adjustment
Procedur e :
1. Connect the modulation meter to ANTENNA point.
2. Adjust the R114 for DEVIATION = 17kHz ± 1.5kHz reading on
the modulation meter.
6. TX power and TX frequency Confirmation
Procedur e :
1. Connect the modulation meter to ANTENNA point.
2. Confirm the TX power is – 5dBm ± 2.5dB.
Confirm the TX frequency is 926.55MHz ±1kHz.
Connection P oints and Adjustments Loca t ion :
IC11 ( ^™ pin) : Frequency counter
C103
70
65
62 60
54
53
IC3
IC4
50
IC11
40
33
20
30 32
C103 : 18.25MHz CLOCK REFERENCE Adjustment
IC3
IC11
C87 : QUAD-TUNE VOLTAGE Adjustment
– 24 –
: 903.5MHz
: 1kHz
: ± 25kHz
: – 70 dBm (EMF)
HAND MAIN board
ATE TERMINAL
TX LOOP V : Digital voltmeter
RX LOOP V : Digital voltmeter
QUAD-TUNE : Digital voltmeter
IC4
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