Sony ICF-DVD57TV Service Manual ▷ View online
17
ICF-DVD57TV
Adjustment and Connecting Location:
– TU BOARD (Conductor Side) –
TP
(VT)
TP
(GND)
TP
(ANT)
– TU BOARD (Component Side) –
L4
AM VCO Voltage Adjustment
L2
FM VCO Voltage Adjustment
FM Tracking Adjustment
T1 AM IF Adjustment
T2 FM IF Adjustment
L1
CT1
CT1
AM Tracking Adjustment
L3
CT3
18
ICF-DVD57TV
5-2-3. VSS (–13.0V) Check
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1951 and TP1901 (GND)
on the MONITOR board.
2. Check that the reading of digital voltmeter is –12.0
±
1.0 V.
5-2-4.
7.5V Check
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1909 and TP1901 (GND)
on the MONITOR board.
2. Check that the reading of digital voltmeter is 7.4
±
0.2 V.
5-2-5.
3.9V Check
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1421 and TP1901 (GND)
on the MONITOR board.
2. Check that the reading of digital voltmeter is 3.85
±
0.2 V.
5-2-6.
Inverter Voltage Check
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1412 and TP1901 (GND)
on the MONITOR board.
2. Check that the reading of digital voltmeter is 8.0
±
0.2 V.
MONITOR SECTION
5-1. VOLTAGE AND FREQUENCY ADJUSTMENT
5-1-1.
5.0V Adjustment
Connection:
Adjustment Procedure:
1. Connect a digital voltmeter to the TP1907 and TP1901 (GND)
on the MONITOR board.
2. Adjust the RV1901 so that the reading of digital voltmeter is
5.0
±
0.1 V.
5-1-1.
DC/DC Converter Frequency Adjustment
Connection:
Adjustment Procedure:
1. Connect a frequency counter to the TP1906 and TP1901
(GND) on the MONITOR board.
2. Adjust the RV1902 so that the reading of frequency counter is
243
±
1 kHz.
5-2. VOLTAGE CHECK
5-2-1.
VDD (3.3V) Check
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1954 and TP1901 (GND)
on the MONITOR board.
2. Check that the reading of digital voltmeter is 3.1
±
0.2 V.
5-2-2.
VGH (17.0V) Check
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1952 and TP1901 (GND)
on the MONITOR board.
2. Check that the reading of digital voltmeter is 16.8
±
1.0 V.
digital
voltmeter
TP1901 (GND)
TP1954
set
+
–
–
digital
voltmeter
TP1901 (GND)
TP1952
set
+
–
–
digital
voltmeter
TP1901 (GND)
TP1951
set
+
–
–
digital
voltmeter
TP1901 (GND)
TP1909
set
+
–
–
digital
voltmeter
TP1901 (GND)
TP1421
set
+
–
–
digital
voltmeter
TP1901 (GND)
TP1412
set
+
–
–
+
–
–
TP1901 (GND)
TP1906
set
frequency
counter
digital
voltmeter
TP1901 (GND)
TP1907
set
+
–
–
19
ICF-DVD57TV
5-3. PLL ADJUSTMENT
Connection:
Adjusting Procedure:
1. Connect a digital voltmeter to the TP1651 and TP1901 (GND)
on the MONITOR board.
2. Adjust the RV1651 so that the reading of digital voltmeter is
2.2
±
0.15 V.
5-4. V COM ADJUSTMENT
Connection:
Adjusting Procedure:
Connect an oscilloscope to the TP1960 and TP1901 (GND) on the
MONITOR board.
Connect an oscilloscope to the TP1960 and TP1901 (GND) on the
MONITOR board.
5-4-1.
Voltage Set Up Adjustment
Adjust the set so that the A level of the waveform on the oscilloscope
is 6.6
is 6.6
±
0.1 Vp-p. (Refer to the 5-7. video bus adjustment)
5-4-2.
Position Set Up Adjustment
Check the B level of the waveform on the oscilloscope is 4.7
±
0.1
Vp-p and adjust the RV1501 so that the C level of the waveform
on the oscilloscope is –1.9
on the oscilloscope is –1.9
±
0.1 Vp-p.
digital
voltmeter
TP1901 (GND)
TP1651
set
+
–
–
+
–
–
TP1901 (GND)
TP1960
set
osclloscope
A
B
0V
C
5-5. OSD DOT CLOCK CHECK
Connection:
Adjusting Procedure:
1. Connect an frequency counter to the TP1515 and TP1901
(GND) on the MONITOR board.
2. Check that the reading of frequency counter is 6.5
±
0.2 MHz.
5-6. NTSC SUB CARRIER CHECK
Connection:
Checking Procedure:
1. Connect an frequency counter to the TP1510 and TP1901
(GND) on the MONITOR board.
2. Check that the reading of frequency counter is 3.579545 MHz
±
100 Hz.
5-7. VIDEO BUS ADJUSTMENT
Connection: (5-7-1 to 5-7-9)
Condition: (5-7-1 to 5-7-9)
Input the NTSC video signal (10 step (no burst)) (1 Vp-p 75
Input the NTSC video signal (10 step (no burst)) (1 Vp-p 75
Ω
) to
the INPUT VIDEO jack (JK501) on the MAIN board from NTSC
pattern generator.
pattern generator.
Adjusting Procedure:
1. Set the TV test mode (Refer to TV TEST MODE (See page
13).
2. Press the [TV MENU] key to select “LOAD DEFAULT”, and
press the [ENTER] key to write initial values to the EEPROM.
Note:
It carries out, only when EEPROM (IC1451) is exchanged.
3. Press the [TV MENU] key to select “FOR FACTORY”, and press
the [ENTER] key to enter the adjustment mode.
4. If entering the adjustment mode, press the [TV MENU] key to
select item, and press the [ENTER] key to execute all adjustment
items mentioned below.
items mentioned below.
+
–
–
TP1901 (GND)
TP1515
set
frequency counter
(high impedance probe)
+
–
–
TP1901 (GND)
TP1510
set
frequency counter
(high impedance probe)
+
–
–
NTSC pattern
generator
TP1901 (GND)
TP1963 or
TP1964 or
TP1964 or
TP1965
set
osclloscope
INPUT VIDEO jack
(JK501)
20
ICF-DVD57TV
5-7-5. White Limit (White Limiter Level) Adjustment
Adjusting Procedure:
1. Connect an oscilloscope to the TP1964 and TP1901 (GND)
on the MONITOR board.
2. Adjust the
. / >
keys so that the F level of the
waveform on the oscilloscope is 4.0
±
0.05 Vp-p.
5-7-6.
R-Sub BRT (R-ch Sub Bright) Adjustment
Adjusting Procedure:
1. Connect an oscilloscope of 1 step voltage to the TP1963 and
TP1901 (GND) on the MONITOR board.
2. Adjust the
. / >
keys so that the B level of the
waveform on the oscilloscope is 1.0
±
0.1 Vp-p.
5-7-7.
B-Sub BRT (B-ch Sub Bright) Adjustment
Adjusting Procedure:
1. Connect an oscilloscope of 1 step voltage to the TP1965 and
TP1901 (GND) on the MONITOR board.
2. Adjust the
. / >
keys so that the B level of the
waveform on the oscilloscope is 1.0
±
0.1 Vp-p.
5-7-8.
R-Sub CONT (R-ch Sub Contrast) Adjustment
Adjusting Procedure:
1. Connect an oscilloscope of 10 step voltage to the TP1963 and
TP1901 (GND) on the MONITOR board.
2. Adjust the
. / >
keys so that the E level of the
waveform on the oscilloscope is 3.25
±
0.1 Vp-p.
5-7-1. Gamma 1 Adjustment
Adjusting Procedure:
1. Connect an oscilloscope to the TP1964 and TP1901 (GND)
on the MONITOR board.
2. Adjust the
. / >
keys so that the C level of the
waveform on the oscilloscope is 2.1
±
0.1 Vp-p.
5-7-2.
Gamma 2 Adjustment
Adjusting Procedure:
1. Connect an oscilloscope to the TP1964 and TP1901 (GND)
on the MONITOR board.
2. Adjust the
. / >
keys so that the D level of the
waveform on the oscilloscope is 3.0
±
0.1 Vp-p.
5-7-3.
Y Gain (Luminance Signal Contrast Level)
Adjustment
Adjustment
Adjusting Procedure:
1. Connect an oscilloscope to the TP1964 and TP1901 (GND)
on the MONITOR board.
2. Adjust the
. / >
keys so that the E level of the
waveform on the oscilloscope is 3.25
±
0.1 Vp-p.
5-7-4.
Black Limit (Black Limiter Level) Adjustment
Adjusting Procedure:
1. Connect an oscilloscope to the TP1964 and TP1901 (GND)
on the MONITOR board.
2. Adjust the
. / >
keys so that the A level of the
waveform on the oscilloscope is 1.0
±
0.05 Vp-p.
B
0V
B
0V
E
0V
F
0V
E
0V
A
0V
C
0V
D
0V
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