Electrical Adjustments - Sony D-FJ200 Service Manual

ELECTRICAL ADJUSTMENTS

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 C10
D4
Q8
R4
D2
L2
C21
FL1
R16
C43
FJ200:US
C12
FL2
C22 Q4
D3
L4
C9
R2
TP6(TU GND)
level meter
16 Ω
set
phones jack (J301)
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.
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AM FREQUENCY COVERAGE ADJUSTMENT
Reading on digtal
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
Adjust for a maximum reading on level meter.
L4 87.5MHz
Confirmation 108MHz
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
C22 Q4
D3
L4
C9
R2
TP6(TU GND)
Adjustment Location :
[MAIN BOARD] (SIDE B)
> : 9kHz step
voltmeter
<6.9–8.4V>
0 dB = 0.765V
CD SECTION
The CD section adjustments are done automatically in this set.
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
C613
(A GND)
C612
FL1
C615
1 TP601(RF)
2
R300
R605
3 C304
Q601
C R608
7 7
CT1 : AM Tracking Adjustment
L5 : AM Tracking Adjustment
L4 : FM Traking Adjustment
L2 : TV/WB/FM Frequency
Coverage Adjustment
Procedure:
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.
C310
C30
C308
C309
12
22
11
23
D-FJ200/FJ201
L3 : TV/WB Traking Adjustment
RF level
0.4 to 0.8 Vp-p