Akai VS-X9EGN

9-2. VIDEO PCB ADJUSTMENTS
Precautionary items prior to adjustments
1.
The
color
bar
generator
output
should
be
1.0
Vp-p.
2.
Video
output
terminal
should
be
terminated
with
75
ohms
(dummy
or
load).
———_,
VIDEO. ADJUSTMENT
Y REC CURRENT
1. “REC” PAL or NTSC/SECAM
color bar signal among one
on the “AUTO” mode.
2. TPi & VR1 (Pre-Amp PCB)
3.
Adjust
VR1
so
that
REC
current
level is 170 + 5 mV.
STEP | ADJUSTMENT ITEM
1. Test mode/System mode
and Input Signal/Test tape.
2. Test point and Adjust part.
3. Result and Remarks.
Adjust Part
/
POWER
SW
PCB
/
1. “STOP” & “AUTO” mode
2. TP10 on the VIDEO PCB & VR1
3. 5.14 0.05V
“STOP” & “AUTO” mode
. TP1 & VR3
- 6.3+0.1V
We
. “STOP” mode
2. Monitor screen & VC1
3.
Depress
the
PROGRAM
button
on
the
REMOTE CONTROL unit.
¢
Adjust
VC1
so
that
the
charactors
located center of the monitor
screen.
| ai{ secamperi _|
. “REC/PB” SECAM COLOR BAR
signal on the “AUTO” mode.
. TP6& VL1
. Adjust VL1 to obtain maximum
waveform as shown in picture.
WN &
| 10| secamper2 |
1. “REC SECAM COLOR BAR signal
on the “AUTO” mode.
2. TP2 & VL2
3. Adjust VL2 to obtain maximum
waveform as shown in picture.
NOISE GATE
. “PB” Test tape TF-512CB on the
“SECAM B/G” mode.
- TP8 & VRS.
.
Adjust
VRS
so
that
noise
gate
pulse
position
becomes
1.2
+
0.2us
from
H-SYNC.
Use
the
H-SYNC
for
trigger
signal.
(IC305 Pin (7) on Main PCB)
WN
SECAM
CHAROMA
REC
CURRENT
. “REC” SECAM COLOR BAR
signal on the SECAM B/G” mode.
2. TP1 (Pre-amp PCB) VR6
3.
Set
the
VR1
on
the
PRE-AMP
PCB
to minimum.
¢
Adjust
VR6
so
that
Rec
current
level
is
50
+
5
mVp-p.
¢
Use
the
SWITCHING
PLSE
for
trigger
signal.
20
.
“STOP”
&
“NTSC
3.58”
mode,
no
signal
input.
2.
TPS
&
VR8
+0
35 3.4MH2~) 99 kHz
e Connect a frequency counter
between TP5 and GND.
“REC” PAL COLOR BAR signal.
TP1 (Pre-Amp PCB) & VR4.
Set the VR1 on the PRE-AMP PCB
to minimum.
e Adjust VR4 so that Rec current
level is 40 + SmV.
e Use the SWITCHING PLUSE for
trigger signal.
1.
“PB”
Test
tape
TF-530RFS
or
TE-508RF
on
the
“PAL
B/G”
mode.
2.
TP9&
VRI
3.
4.43362MHz
+
S0Hz
e
Connect
a
frequency
counter
between
TP9
and
GND.
NTSC CHROMA REC CURRENT
1
. “REC” NTSC COLOR BAR signal
on the “AUTO” mode.
TP1 (Pre-amp PCB) & VR7.
Set the VR1 on the PRE-AMP PCB
to minimum.
e Adjust VR7 so that Rec current
level is 40 + 5mV.
e Use the SWITCHING PULSE for
trigger signal.
BELL FILTER
“REC” SECAM COLOR BAR
signal on the “SECAM B/G” mode.
TP4 & VL4
.
Adjust
VL4
so
that
the
white,
Cyan
and
Blue
levels
becomes
flat
as
shown
in
pictures.
Wn
1.
Wry
. “REC” SECAM COLOR BAR
signal on the SECAM B/G” mode.
- TP3 & VL3
. Adjust VL3 so that upper portion
of Magenta and lower portion of
Green
becomes
single
line
as
shown
in picture.
@ Use the H-SYNC for trigger signal.
(IC305 Pin 7 on Main PCB)
@
Use
the
H-SYNC
for
trigger
signal.
NTSC SUB CARRIER
.
“PB”
test
tape
TF-540RFL
or
TF-SO9RF on “NTSC 3.58”
mode.
2. TP9 & VR2
3. 3.57954MHz + 50Hz
¢ Connect the frequency counter
between TP9 and GND.
salt Lows |
GYAN,
NO GOOD