Read Sony ZS-Y3 Service Manual online
10
ZS-Y3
SECTION 4
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function: RADIO
RADIO, AUTO PRESET, BAND button: AM
Function: RADIO
RADIO, AUTO PRESET, BAND button: AM
[FM]
Setting:
Function: RADIO
RADIO, AUTO PRESET, BAND button: FM
Function: RADIO
RADIO, AUTO PRESET, BAND button: FM
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
• Remove FM antenna in FM adjustment.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
32
Ω
i
jack (J321)
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
–
level meter
0.01
µ
F
TU board
TP (GND)
TP (GND)
TU board
TP (ANT)
TP (ANT)
set
32
Ω
i
jack (J321)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
TU board
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz
1.0
± 0.05 V
Confirmation
1,710 kHz
5.3
± 0.7 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
620 kHz
CT3
1,400 kHz
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
108 MHz
3.0
± 0.2 V
Confirmation
87.5 MHz
1.3
± 0.3 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
Adjustment and Connecting Location: TU board
(See page 11)
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