Read Sony ICF-CD555TV Service Manual online
17
ICF-CD555TV
5-3-2. POSITION SET UP ADJUSTMENT
Check the B level of the waveform on the oscilloscope is 4.2
±
0.1 Vp-p and adjust the RV1551 so that the C level of the waveform
on the oscilloscope is –2.4
on the oscilloscope is –2.4
±
0.1 Vp-p.
5-4.
INVERTER HIGH VOLTAGE CHECK
Connection:
Checking Procedure:
Connect an oscilloscope to the TP1805 and TP1806 on the TV
board.
Connect an oscilloscope to the TP1805 and TP1806 on the TV
board.
5-4-1. HIGH VOLTAGE CHECK
Check that the reading of oscilloscope is 550
±
150 V (rms).
5-4-2. FREQUENCY CHECK
Check that the reading of oscilloscope is 70
±
3 kHz.
5-5.
OSD DOT CLOCK CHECK
Connection:
Adjusting Procedure:
1. Connect an frequency counter to the TP1554 on the TV board.
2. Check that the reading of frequency counter is 6.5
1. Connect an frequency counter to the TP1554 on the TV 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 TP1508 on the TV board.
2. Check that the reading of frequency counter is 3.579545
1. Connect an frequency counter to the TP1508 on the TV board.
2. Check that the reading of frequency counter is 3.579545
±
0.0001 MHz.
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 (JK301) 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
1. Set the TV test mode (Refer to TV TEST MODE (See page
12).
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.
5-7-1. GAMMA 1 ADJUSTMENT
Adjusting Procedure:
1. Connect an oscilloscope to the TP1959 on the TV board.
2. Adjust the
1. Connect an oscilloscope to the TP1959 on the TV board.
2. Adjust the
.
/
>
keys so that the H level of the wave-
form on the oscilloscope is 2.1
±
0.1 Vp-p.
5-7-2. GAMMA 2 ADJUSTMENT
Adjusting Procedure:
1. Connect an oscilloscope to the TP1959 on the TV board.
2. Adjust the
1. Connect an oscilloscope to the TP1959 on the TV board.
2. Adjust the
.
/
>
keys so that the J level of the wave-
form on the oscilloscope is 3.0
±
0.1 Vp-p.
B
0V
C
+
–
–
TP1806
TP1805
set
osclloscope
(high resistance probe)
+
–
–
TP1403 (GND)
TP1554
set
frequency counter
(high impedance probe)
+
–
–
TP1403 (GND)
TP1508
set
frequency counter
(high impedance probe)
+
–
–
NTSC pattern
generator
TP1403 (GND)
TP1958 or
TP1959 or
TP1959 or
TP1960
set
osclloscope
INPUT VIDEO jack
(JK301)
H
0V
J
0V
Click on the first or last page to see other ICF-CD555TV service manuals if exist.