Handset Section - Sony SPP-M100 Service Manual

CH1 DC 500mV/div NORMAL 5mSec/div
DUTY of 50%
DUTY is except 50%
DUTY is except 50%
Adjustment Location : Base main board (see page 21)

5-2. HANDSET SECTION

• Apply 4V dc from regulated DC power supply.
• Set to handset manual test mode. (Refer to page 14.)
TX Section Adjustment
1. TX VCO Adjustment
• Perform the adjustments at 25CH (49.970MHz) as a rule.
Setting :
digital
voltmeter
Procedure :
1 The digital voltmeter connected TP6 (TX VCO) to TP8
(GND).
2 Adjust the L51 for 1.95 to 2.05V reading on the digital volt-
meter.
Adjustment Location : Hand main board (see page 21)
2. RX VCO Adjustment
Setting :
digital
voltmeter
Procedure :
1 The digital voltmeter connected TP5 (RX VCO) to TP8
(GND).
2 Adjust the L201 for 2.25 to 2.35V reading on the digital
voltmeter.
Adjustment Location : Hand main board (see page 21)
CH1
CH1
CH1
TP6 (TX VCO)
TP8 (GND)
TP5 (RX VCO)
TP8 (GND)
RX Section Adjustment
• Perform the adjustment at T3CH (RX : 46.800MHz) as a rule.
1. IF Adjustment
Setting :
FM rf signal
generator
level meter
Procedure :
1 FM rf signal generator condition :
Carrier frequency
Modulation
Deviation
Output level
2 Adjust the T202 for the minimum or the –28dBV reading
on the Level meter.
Adjustment Location :
2. DET Adjustment
Setting :
FM rf signal
generator
oscilloscope
Procedure :
1 FM rf signal generator condition :
Carrier frequency
Modulation frequency : 1kHz
Deviation
Output level: 60dBµ V (1mV) (EMF)
2 Adjust the T201 for the maximum reading on the Oscillo-
scope.
Adjustment Location :
– 20 –
TP76 (ANT)
TP8 (GND)
TP58 (IF)
TP8 (GND)
: 46.800MHz
: 1kHz
: 3kHz
: –5dBµV (0.562µ V) (EMF)
Hand main board (see page 21)
TP76 (ANT)
TP8 (GND)
200 Ω
TP4 (SP)
TP3 (SP)
: 46.800MHz
: 3kHz
Hand main board (see page 21)