Sony ZS-PS20CP Service Manual ▷ View online
ZS-PS20CP
13
3-9. KEY (VOL) BOARD, KEY (FUNC) BOARD
3-10. POWER BOARD
three screws
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
two screws
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
screw
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
screw
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
two hold boards
two hold boards
button (VOL)
button (function)
KEY (VOL) board
RB KEY (FUNC) board
CN401 (2P)
cabinet (front) assy
two screws
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
screw
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
POWER board
two screws
((+) BV tapping (B2.6))
((+) BV tapping (B2.6))
ferrite core
CN903 (2P)
cabinet (rear) section
ZS-PS20CP
14
SECTION 4
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB = 1
μV
• AM Section
Setting:
RADIO BAND•AUTO PRESET button: AM
Setting:
RADIO BAND•AUTO PRESET button: AM
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
• FM Section
Setting:
RADIO BAND•AUTO PRESET button: FM
Setting:
RADIO BAND•AUTO PRESET button: FM
ANT2
FM RF signal
generator
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
0.01
μF
set
• Connecting Level Meter (FM, AM)
J jack (J321)
set
32
Ω
level meter
(range: 0.5–5 V ac)
(range: 0.5–5 V ac)
• Connecting Digital Voltmeter (FM, AM)
digital
voltmeter
voltmeter
100 k
Ω
TP (VT)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be fi nally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Frequency Display
530 kHz
1,610 kHz
Reading on Digital voltmeter
0.8 ± 0.1 V
5.0 ± 0.6 V
Adjustment Part
L3
<confi rmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
ANT1
CT3
620 kHz
1,400 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.5 ± 0.5 V
3.0 ± 0.3 V
Adjustment Part
<confi rmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
Adjustment Location: See page 15.
ZS-PS20CP
15
Adjustment Location:
Test Point:
L3: AM FREQUENCY COVERAGE
ADJUSTMENT
ADJUSTMENT
L2: FM FREQUENCY COVERAGE
ADJUSTMENT
ADJUSTMENT
CT1: FM TRACKING
ADJUSTMENT
ADJUSTMENT
ANT1: AM TRACKING
ADJUSTMENT
ADJUSTMENT
CT3: AM TRACKING ADJUSTMENT
L1: FM TRACKING ADJUSTMENT
T1: AM IF ADJUSTMENT
– MAIN BOARD (Component Side) –
L6: FM IF ADJUSTMENT
1
18
36
19
IC1
C14
C13
C13
C15
C3
C6
C7
C5
C67
C12
C1
1
C10
C1
C2
C4
C21
C70
C22
C23
C26
CF3
CF2
C27
C33
R28
R25
R10
R16
R8
R270
R22
R18
C37
C36
R42
JW187
JW183
JW204
JW217
JW212
JW21
1
R20
D6
R26
C16
C45
C9
R6
R1
R3
R12
R15
C42
C41
C41
X1
C40
C34
C35
C38
JW
J
JW185
JW184
JW205
CT3
CT1
D3
L3
D2
L2
D1
L1
D4
D5
JW215
JW203
JW210
JW209
JW216
JW213
JW214
C31
C32
C25
C72
R41
R19
R21
R27
C20
C46
C43
C17
C24
R17
R170
R23
R29
C28
L6
T1
R9
R4
R13
R7
R39
R14
R24
R1
1
R2
R5
C29
C19
C30
C326
C18
C39
L10
MAIN BOARD
TP (VT)
TP (GND)
ZS-PS20CP
16
CD section adjustments are done automatically in this set.
In case of operation check, confi rm that focus bias.
In case of operation check, confi rm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin 2 and pin qa (or
1. Connect the oscilloscope between IC701 pin 2 and pin qa (or
TP (RF OUT) and TP (VC)).
2. Insert the disc (PATD-012 (Tr 15)). (Part No. : 4-225-203-01)
3. Press the [
3. Press the [
N X
] (CD) button.
4. Confi rm that the oscilloscope waveform is as shown in the fi g-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
RF level :
1.1 ± 0.4 Vp-p
1.1 ± 0.4 Vp-p
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
CD SECTION
Test Point:
40
LIMIT
21
20
1
80
61
60
41
1
3
1
16
AVCC
SPD
SLD
TRK
FCS
TE
VC
FE
RF OUT
AVGND
E
(11)
11
1-877-003-
IC701
IC704
C725
R728
R722
R721
R719
R718
R716
R716
C704
C702
R754
R753
R752
R751
R749
R745
FB702
X701
R717
C711
C726
R534
C714
C715
Q701
C712
C529
C724
R735
R736
R733
R727
R734
C722
R731
C721
C716
C710
C708
R702
R701
C759
C701
C754
R755
R748
R747
R746
C709
R724
R732
C719
C728
C729
R744
R742
R741
R740
R737
C764
CN701
R533
R723
R51
R710
R709
R707
R706
C703
R709
R707
R706
C703
TP (RF OUT)
– CD BOARD (Conductor Side) –
TP (VC)
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