Panasonic CT-110MA - Page 11

GENERAL ALIGNMENT
Note: Use Video Pattern Generator for following align 
ments. (Video input should read 1.0 Vp-p.)
ALIGNMENT OF SUB CONTRAST
1. Use a color bar signal.
2. Set Color control ( R605) fully counterclockwise.
3. Connect an oscilloscope to TP48 of C-Board.
(TNP12950ZA)
4. Adjust the SUB-CONT control (R303) to obtain 1.7 V
p-p ± 0.1 Vp-p from the white level to pedestal level.
(See figure 12.)
APC ALIGNMENT
Preliminary Steps (See figure 13)
1. Use a color bar signal.
2. Set Color Control (R605), Bright Control (R309) and
Panabrite Control ( R304) in a fully clockwise position.
3. Set Tint Control (R603) to mid-position.
4. Connect a jumper between terminal @ and terminal ®
ofIC601 .
5. Connect a 15 kC2 resistor between terminal @ of IC601
and +12 V Line.
Alignment Procedure
1. Adjust APC Control (C607) to just sync the color bars.
2. Remove the jumper between terminal ® and terminal
© of IC601.
3. Remove the 15 kQ resistor between terminal @ of
IC601 and +12 V Line.
CONDUCTOR VIEWS
C-BOARD TNP12950ZA
HORIZONTAL HOLD ALIGNMENT
Alignment Procedure
1. Use a black and white video pattern.
2. Turn Horizontal-Hold Control VR (R507) on main
circuit board fully counterclockwise.
3. Short R529 with jumper wire.
4. Turn the VR (R507) slowly clockwise and set at the
point where horizontal hold just pulls-in.
5. Disconnect jumper wire.
CIRCUIT EXPLANATION
HORIZONTAL OSC, DISABLE CIRCUIT
1. Under normal operating conditions, zener diode (D505)
is cut OFF due to its low cathode voltage.
2. When the pulse amplitude applied to diode D504 in 
creases, it raises the cathode voltage of zener diode D505.
As a result, D505 conducts.
3. The conduction of D505 increases pin © voltage of
IC401 . This causes the Horizontal Oscillator Circuit to
stop and the high voltage is reduced to zero.
D-BOARD TNP55997ZA
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