Read Sony ICF-DVD57TV Service Manual online
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
+
–
–
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