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5-2. A BOARD ADJUSTMENTS
A-21
A BOARD
-component
I
1) Input a color-bar signal.
2) Adjust AGC VR of TU 101 so that snow noise and
cross-modulation
disappear
3) Confirm them at every channel.
ADJUSTMENT (HFRE)j
1) Set to Service Mode.
2) Input a color-bar signal.
3) Connect a frequency counter to base of Q 507.
4) Call the item of AFC, set to 3 level (free run).
5) Select HFRE withlandM.
6) AdjustIandBto
the 15735& 60 Hz level.
7) Call the item of AFC again, adjust the level" 01".
8) Write into the memory by pressing -1
then ENTER
ADJUSTMENT (vFRE)j
1) Set the Service Mode.
2) Input an off-air signal (VIDEO IN - no signal).
3) Connect the frequency counter across connector
VDY - 63
of DY-1 connector and ground.
4) Select VFRE withmandm.
5) AdjustaandHto
the 55
6) Write the memory by pressing [Ml + then
1
from
the
picture.
Hz.
1) Set to Service Mode.
2) Input a color-bar signal. (75 IRE)
3) Set the conditions as follows.
PICTURE ......... MAX
........ Mm
COLOR
........ Mm
BRIGHT
........
R OFF
........
G OFF
........
B OFF
(It becomes minimum).
SERVICE ROFF 1
4) Connect an oscilloscope to TP 49 El
and ground.
5) Adjustdand@to
the 2.20 (27) 2.05 (32)k 0.05 Vp
6) Write the memory by pressing-1 -+ then
.
7) Return the following back to normal after
adjustment.
......... ON
G OFF
........ *ON
B OFF
......... CENTER
COLOR
......... CENTER
BRIGHT
PICTURE ......... 80%
of C board
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