Sony ZS-YN7 Service Manual ▷ View online
9
ZS-YN7
3-5. CD BLOCK SECTION
3-4. CHASSIS SECTION
1
screw (B2.6)
8
two screws (B2.6)
8
two screws (B2.6)
9
chassis section
3
connector
(CNP1)
(CNP1)
4
TU board
5
flexible flat cable (21core)
(CN803)
(CN803)
6
connector
(CN807)
(CN807)
2
3
two screws
(B3)
(B3)
0
four screws
(B2.6)
(B2.6)
6
MAIN board
9
spring (CD block)
5
two screws
(B3)
(B3)
4
two wiring stoppers
1
flexible flat cable (29core)
(CN805)
(CN805)
2
connector
(CN806)
(CN806)
qa
qs
CD block section
7
three screws
8
shield plate (7)
10
ZS-YN7
3-6. LCD BOARD
2
1
3
seven screws (B2.6)
5
CD window
6
five screws (B2.6)
4
CD ring
0
panel CD sub assy
qa
flexible flat cable (21core)
(CN401)
(CN401)
qs
LCD board
8
KEY (JOG) board
9
five screws (B2.6)
7
flexible flat cable (5core)
(CN403)
(CN403)
11
ZS-YN7
SECTION 4
TEST MODE
CD TEST MODE
Procedure:
1. Press the [POWER] button to turn the power on.
2. Select the CD test mode by momentarily shorting both of TAP
2. Select the CD test mode by momentarily shorting both of TAP
(TEST A).
Refer to CD section of ELECTRICAL ADJUSTMENT (see
page 14) for details of operation in this mode.
LCD TEST MODE
Procedure:
1. Press the [POWER] button to turn the power on.
2. Set the LCD test mode by momentarily shorting both of TAP
2. Set the LCD test mode by momentarily shorting both of TAP
(TEST B) on the MAIN board and the version of micro-
computer is displayed.
computer is displayed.
3. Then all segments on and all segments off are repeated for 10
seconds alternately.
4. To release the LCD test mode, press the [POWER] button to
turn the power off.
Connecting Location:
– MAIN Board (Conductor Side) –
TAP
(TEST B)
TAP
(TEST A)
CN805
IC301
CN804
CN803
CN904
12
ZS-YN7
SECTION 5
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
(
): Singapore, Korean and Australian models
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz (531 kHz)
1.0
± 0.05 V
Confirmation
1,710 kHz
5.3
± 0.7 V (5.2 ± 0.6 V)
(1,611 kHz)
(
): Singapore, Korean and Australian models
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
620 kHz (621 kHz)
CT3
1,400 kHz (1,404 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 13)
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