Electrical Adjustments - Sony ZS-Y3 Service Manual

ZS-Y3
TUNER SECTION
[AM]
Setting:
Function: RADIO
RADIO, AUTO PRESET, BAND button: AM
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
set
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
[FM]
Setting:
Function: RADIO
RADIO, AUTO PRESET, BAND button: FM
TU board
FM RF signal
TP (ANT)
generator
0.01 µ F
75 kHz frequency
deviation by 1 kHz
TU board
signal
TP (GND)
Output level:
as low as possible
TU board
TP (VT)
TP (GND)
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
• Remove FM antenna in FM adjustment.
10
SECTION 4

ELECTRICAL ADJUSTMENTS

0 dB=1 µV
level meter
32 Ω
+
–
i jack (J321)
level meter
32 Ω
+
set
–
i jack (J321)
digital voltmeter
100 k Ω
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display
L4 530 kHz
Confirmation 1,710 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
CT3
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display
L2 108 MHz
Confirmation 87.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1
Adjustment and Connecting Location: TU board
450 kHz
Reading on Digital Voltmeter
1.0 ± 0.05 V
5.3 ± 0.7 V
620 kHz
1,400 kHz
10.7 MHz
Reading on Digital Voltmeter
3.0 ± 0.2 V
1.3 ± 0.3 V
87.5 MHz
108 MHz
(See page 11)