JVC AV28R100EKS, Service Manual

Page: 57 / 93

No. 51754
AV-29RF6
25
Item
Measuring
instrument
Test point Adjustment part Description
[Method of adjustment without measuring instrument]
Adjustment
Of
SECAM
BLACK
OFFSET-
Ⅰ
Ⅰ Ⅰ
Ⅰ
Remote
control unit
7. BLACK OFFSET
(R-Y)
(B-Y)
1. Receive the SECAM broadcast.
2. Select 2. V/C from SERVICE MENU.
3. Select 7. BLACK OFFSET with the MENU UP / DOWN key.
4. Set the initial setting value for 7. BLACK OFFSET (R-Y) and
(B-Y) with
4
and
7
or
6
and
9
keys of the remote control.
5. If the picture is not the best with the initial setting value, make
fine adjustment until you get the best picture.
6. Press the OK key and memorise the set value.
[Method of adjustment using measuring instrument] Adjustment
Of
SECAM
BLACK
OFFSET-
Ⅱ
Ⅱ Ⅱ
Ⅱ
Signal
generator
Oscillo-
scope
Remote
control unit
35 PIN (R-Y)
36 PIN (B-Y)
IC 1301 On
MAIN PWB
7. BLACK OFFSET
(R-Y)
(B-Y)
1. Input the SECAM full field colour bar signal ( with 75% white).
2. Select 2. V/C from SERVICE MENU.
3. Select 7. BLACK OFFSET with the MENU UP / DOWN key.
4. Connect the oscilloscope between
35
pin of IC 1301 and TP-E.
5. By using
4
and
7
keys of the remote control, adjust the BLACK
OFFSET (R-Y) so that it becomes the waveform changes from
(A)
to
(B)
shown in the figure.
6. Connect the oscilloscope between
36
pin of IC 1301 and TP-E.
7. By using
6
and
9
keys of the remote control, adjust the BLACK
OFFSET (B-Y) so that it becomes the waveform changes from
(C)
to
(D)
shown in the figure.
8. If the picture is not the best with the adjusted picture, make fine
adjustment until you get the best picture.
9. Press the OK key twice to return to the normal screen.
[R-Y]
(A) (B)
[B-Y]
(C) (D)
B-Y
▲ ▲ ▲ ▲
B-Y
▼ ▼ ▼ ▼
R-Y
▲ ▲ ▲ ▲
R-Y
▼
▼ ▼
▼