Sony Dream Machine ICF-CD555TV, Service Manual

Page: 16 / 76

16
ICF-CD555TV
5-1-5. 3.9V CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1411 on the TV board.
2. Check that the reading of digital voltmeter is 3.85
±
0.2 V.
5-1-6. 7.5V CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1907 on the TV board.
2. Check that the reading of digital voltmeter is 7.3
±
0.2 V.
5-2. PLL ADJUSTMENT
Connection:
Adjusting Procedure:
1. Connect a digital voltmeter to the TP1651 on the TV board.
2. Adjust the RV1651 so that the reading of digital voltmeter is
2.2
±
0.15 V.
5-3. V COM ADJUSTMENT
Connection:
Adjusting Procedure:
Connect an oscilloscope to the TP1955 on the TV board.
5-3-1. VOLTAGE SET UP ADJUSTMENT
Adjust the set so that the
A
level of the waveform on the
oscilloscope is 6.6
±
0.1 Vp-p. (Refer to the 5-7. video bus adjust-
ment (See page 17))
MONITOR SECTION
5-1. VOLTAGE CHECK
5-1-1. VDD (3.3V) CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1904 on the TV board.
2. Check that the reading of digital voltmeter is 3.3
±
0.2 V.
5-1-2. VGH (17.0V) CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1912 on the TV board.
2. Check that the reading of digital voltmeter is 17.5
±
0.5 V.
5-1-3. VSS (–13.0V) CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1911 on the TV board.
2. Check that the reading of digital voltmeter is –12.5
±
0.5 V.
5-1-4. 13.5V CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1401 on the TV board.
2. Check that the reading of digital voltmeter is 11.5
±
0.5 V.
digital
voltmeter
TP1403 (GND)
TP1904
set
+
–
digital
voltmeter
TP1403 (GND)
TP1912
set
+
–
digital
voltmeter
TP1403 (GND)
TP1911
set
+
–
digital
voltmeter
TP1403 (GND)
TP1401
set
+
–
digital
voltmeter
TP1403 (GND)
TP1411
set
+
–
digital
voltmeter
TP1403 (GND)
TP1907
set
+
–
digital
voltmeter
TP1403 (GND)
TP1651
set
+
–
+
–
TP1403 (GND)
TP1955
set
osclloscope
A