Vif Adjustment - Sanyo C25ZG56 Service Manual

VIF Adjustment
Item
Detector Adj. NTSC Trap Adj.
Overall Waveform Adj.
DC 15V
R368(C364 side)
R368(C364
side) R368(C364 side)
IF AGC(3.5- 4.5V) ICI 01- pin48
lCIO1-pin48 IC101 - pin48
,5 BAND
No band (Q784-Base+Ground,
NO band
No band
E
a)
through 1k Q resistor)
: Output Probe
TUNER-IF
TUNER-IF TUNER-IF
~ Input Probe Q1 22- Emitter
Q1 22- Emitter Q1 22- Emitter
Ground
TP-A
TP-A
TP-A
100 Q Dumping Resistor +R124
g SIF System any
S-5(4 .5MHZ)
any
:E Sweep ATT. 18dB
18dB 18dB
? Output Probe side a
side a
side a
6 Oscilloscope Sens. 10OmV/DIV 10mV/DIV
10OmV/DIV
Adjust P (38.9MHz) to be
Using T1 02, adjust A(34.4MHz) to Adjust the overall waveform level
Adjustment
maximum amplitude by using be minimum amplitude.
to become lVP – p with IF AGC
T121 .
VOLTAGE. .
Waveform
A
~\
,~:p
Input Probe
10KQ
/
+
Oscilloscope
"G"+ -
j DC 15V
Detector Adj.
R366
101
IC352
VR351
'pi
-a
—
100 Q Dumping
Resistor
0702
J
m=
pin-48
a
1H DELAY m~'
'7% mm
VR120
H-C;;;;; ~ AGC
02030
m
w
B
0101
SECAM
DC 3.5 – 4.5V
@
TP-D
KDY
VR462
NTSC
Trap Adj.
~
)
o
IC451
VERT.
AMP,
00
VR451
KSC
Q#g
o
SW451
ii%'
Output Probe
0245
0
0
0810
m
a
TV/AV SWITCH
TP – A
m
(No Band Setting)
7
1K!2
w
DOWN +
UP
VERT. CENTER
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