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.
5-4-1.
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 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
±
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
Ω
) to
the INPUT VIDEO jack (JK501) on the MAIN board from NTSC
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.
+
–
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
TP1965
set
osclloscope
INPUT VIDEO jack
(JK501)
