Sharp 29A-SX1, Service Manual

Page: 9 / 86

9
29A-SX1
29A-SX5
29A-SX8
SX-68JF200
9
DIGIT
AL COMB FIL
TER
Y LEVEL ADJUSTMENT
NO
.
Adjustment par
t
Adjusting procedure and conditions
W
a
v
e
fo
rm
and others
1
Digital comb filter Y le
v
e
l adjust-
ment R5406
1
Input P
AL colour bar signal (100% white colour
bar) of 1.0Vp-p at the 75
Ω
ter
minator from A
V
-
IN ter
minal.
(Input le
v
el 1.0Vp-p
±
0.05Vp-p)
2
Connect the oscilloscope to
TP5400.
3
Adjust R5406 to mak
e the
Y signal (100% white)
of
TP5400 become 2.0
±
0.1Vp-p
.
*
V
er
ify that all are linear
ly amplified.
(100% white
area must not be collapsed.)
When it is adjusted at E-12ch, tak
e
care f
or the v
oltage v
alue
.
SER
VICE ADJUSTMENT
PIF CHECK ADJUSTMENT
NO
.
Adjustment par
t
Adjusting procedure and conditions
W
a
v
e
fo
rm
and others
1
RF-A
GC
Cut-in adjustment (Already preset.)
1
E-12CH (P
AL Colour Bar) is receiv
ed.
Electr
ic field strength:
54
±
1dB
µ
V (75
Ω
Open)
2
Connect the oscilloscope to
TP210 as sho
wn
belo
w
.
Note:
If the impedance con
v
e
rter of
50/75 is not used at the electr
ic
field strength meter of 50
Ω
sys-
tem, set 52
±
1dBV f
or 54
±
1dB
µ
V (75
Ω
Open).
Moreo
v
e
r,
tak
e care f
or the loss
if the con
v
e
rter is used.
Fig. 3-1
3
Lo
w
er the input electr
ic field strength to 51
±
1dB
µ
V (75
Ω
Open).
4
Under the conditions
1
and
3
, TP210
v
olt-
age does not v
a
ry
.
Raise the input signal electr
ic field strength to
60
±
1dB
µ
V (75
Ω
Open), and v
e
rify that it is
0.1V or more lo
wer than
TP210 of
1
and
3
.
5
Set the signal at 63 to 67dB
µ
V
, and v
e
rify that
an
y noise is not output.
6
Set the signal at 90 to 95dB
µ
V
, and v
e
rify that
an
y b
lac
k letter beat is not output.
VIDEO LEVEL ADJUSTMENT
1
VIDEO DET Le
v
el adjustment
R220
1
E-12CH B/G-P
AL colour bar (100% white bar)
is receiv
ed.
2
Adjust R220 to mak
e the video output of the
A
V
-OUT ter
minal become 1.0
±
0.05Vp-p at the
75
Ω
ter
minator
.
NO
.
Adjustment par
t
Adjusting procedure and conditions
W
a
v
e
fo
rm
and others
*
If there is not an
y prob
lem when the
se
v
e
ral lots of the model which em-
plo
ys the rele
v
ant tuner is chec
k
ed,
apply the chec
k of only
5
and
6
.
0.1V
Bias box
TP210
TV SET
Oscilloscope
Bias Box: About 4.5V