Sony ZS-Y3 Service Manual ▷ View online
9
ZS-Y3
3-6. LCD BOARD
2
1
8
panel (CD (3)) sub assy
9
flexible flat cable (27 core)
(CN401)
(CN401)
0
LCD board
6
three screws
4
CD window
7
two screws
5
CD ring
3
seven screws
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)
11
ZS-Y3
Adjustment and Connecting Location:
L4
AM Frequency Coverage Adjustment
L2
FM Frequency Coverage Adjustment
AM Tracking Adjustment
CT3
L3
L3
FM Tracking Adjustment
T1 AM IF Adjustment
T2 FM IF Adjustment
L1
CT1
CT1
TP
(VT)
TP
(GND)
TP
(ANT)
– TU Board (Component Side) –
– TU Board (Conductor Side) –
12
ZS-Y3
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
Focus Bias Check
1. Connect a oscilloscope to TP (RF) and TP (GND) on the CD
board.
2. Insert the disc (YEDS-18). (Part No.: 3-702-101-01)
3. Press the
3. Press the
u
button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
◊) in
thecenter of the waveform can be clearly distinguished.
RF Signal Reference Waveform (Eye Pattern)
Checking Location:
– CD BOARD (Conductor Side) –
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
0.65 to 1.05 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
IC701
TP (GND)
TP
(RF)
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