Electrical Adjustmens - Sony D-FJ200 Service Manual

Q Q
ELECTRICAL ADJUSTMENTS
3 7 6 3 1 5 1 5 0
0 dB = 1µV
TUNER SECTION
AM section
BAND : AM
AM RF signal
Put the lead-wire
generator
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM section
FM RF signal
BAND :FM
generator
TP3
0.01 µ F
(FM RF IN)
33.75kHz frequency deviation
by 1kHz signal.
[MAIN BOARD]
Output level :
(Side A)
as low as possible
FJ201
1
TP3(FM RF IN)
TP1(VT)
BP1
FJ200:US
C27 CF2
C16
C37
C23
L3
C8
D4
Q8
R4
D2
T E
L 1 3 9 4 2 2 9 6 5 1 3 L2
C21
FL1
R16
C43
FJ200:US
FL2
C22 Q4
D3
L4
C9
R2
TP6(TU GND)
level meter
16 Ω
set
phones jack (J301)
w w w
.
SECTION 4
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts Frequency
Confirmation 530kHz <531kHz> Standard value : 0.8–1.8V
Standard value : 8.5–10.0V
Confirmation 1,710kHz <1,602kHz>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5 620kHz <621kHz>
CT1 1,400kHz <1,404kHz>
TV/WB/FM FREQUENCY COVERAGE ADJUSTMENT
Frequency Reading on digtal voltmeter
Confirmation 87.5MHz Standard value : 4.3–5.7V
Adjustment value : 9.5V
L2 108MHz
Standard value : 9.0–10.0V
Confirmation
TV : 2ch Standard value : 0.1–0.55V
(US model)
FM TRACKING ADJUSTMENT
C10
Adjust for a maximum reading on level meter.
L4 87.5MHz
Confirmation 108MHz
C12
TV/WB TRACKING ADJUSTMENT
FL1
Adjust for a maximum reading on level meter.
1 L3 197.75MHz [TV : 10ch]
2
Adjustment Location : Main board
3
Frequency Coverage Adjustment
Setting :
TP1 (VT)
[MAIN BOARD]
(Side A)
TP6 (TU GND)
FJ201
1
TP3(FM RF IN)
TP1(VT)
FJ200:US BP1
C27
C16
C37
L3
C8
Q8
R4
D2
C21
FL1
R16
C43
FJ200:US
FL2
x a o
C22 Q4
y
D3
L4
i
C9
R2
TP6(TU GND)
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8
Adjustment Location :
[MAIN BOARD] (SIDE B)
< > : 9kHz step
Reading on digtal
voltmeter
<6.9–8.4V>
0 dB = 0.765V
CD SECTION
The CD section adjustments are done automatically in this set.
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3 7 6 3
Precautions for Check
1. Perform check in the order given.
US model
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Power supply voltage requirement :DC4.5 V in DC IN jack.
VOLUME button : Minimum
HOLD switch : OFF
RF Level Check
Condition:
digital voltmeter
• Hold the set in horizontal state.
(DC range)
Connection:
[MAIN BOARD]
TP601(RF)
(Side A)
CL410(A GND)
CF2
C23
C630
C10
D4
5
L2
4 C606
CL410
C12
u 1 6 3
C613
(A GND)
C612
FL1
C615
.
1 TP601(RF)
2
R605
3
Q601
C R608
7 7
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2 4
9 9 8
CT1 : AM Tracking Adjustment
L5 : AM Tracking Adjustment
L4 : FM Traking Adjustment
L2 : TV/WB/FM Frequency
Coverage Adjustment
Procedure:
1 5 1 5 0 8 9 2 4
1. Connect the oscilloscope to the test point TP601(RF) on the
MAIN board.
2. Set a disc. (YEDS-18)
3. Press the u button.
4. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (◊) in the cen-
(J401) ter of the waveform can be clearly distinguished.
RF Signal reference Waveform (Eye Pattern)
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500ns
oscilloscope
(AC range)
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy
watch-ing.
5. Stop revolving of the disc motor by pressing the x button.
m
c o
C310
C30
C308
C309
12
R300
22
11
C304
23
D-FJ200/FJ201
2
9 9
L3 : TV/WB Traking Adjustment
9 8 2 9 9
RF level
0.4 to 0.8 Vp-p