Adjustment; Notes About The Adjustment - Sanyo CE14A1-E Service Manual

8.- ADJUSTMENT

ADJUST AJUSTMENT
ORDER
1 B1 Power Circular
supply pattern
2.A IF Detector IF Signal
AFC 38,9MHz into
pin1 SF200
2.B AGC Circular
pattern
Band UHF
Channel 25
3.A Vertical size Circular
pattern
3.B Vertical centre Circular
pattern
4.A Horizontal Circular
width pattern
4.B Horizontal Circular
centre pattern
5.A Cut-off AV Mode
preadjustment Without signal
5.B G2 AV Mode
Without signal
5.C Cut-off AV Mode
Without signal
5.D Tone Circular
pattern
6 Focus Circular
pattern

8.1.- NOTES ABOUT THE ADJUSTMENT:

In case of doing several adjustments follow the adjustment order in this table, for example, the adjusts Nº2 (AFC detector and AGC) prevails over the Nº6 (FOCUS), adjustment Nº5B (G2) prevails over the Nº5C (Cut-off).
Œ
Factory picture control normal has the following OSD positions:
•
Brightness: 34
(Push key "+" 34 times starting at minimum position)
•
Contrast: 57
•
Colour: 32
•
Sound: 34
•
The service line is obtained by connecting a resistor of 100 Ω from the test point (R718-C713) to ground. If it is shorted to ground directly, the TV set might pass to Stand-by (due to actuation of the deflection circuit protection).
Ž
There can be found 2 positions of the L201 core for which the voltage in R211 is of 3,5V, but the only correct position is that in which that the voltage goes up as the core is introduced in the body of de L201, and the picture is
acceptable.
SIGNAL CONDITIONS
Picture TV: Normal Œ
Sound: Volume to minimum
Level of apply IF signal (38,9MHz) of
80 to 250 mVrms on 75Ω in sync.
Level of aerial signal
60,0 dBµV. (1.0 mVrms.)
TV controls: Normal Œ
TV controls: Normal Œ
TV controls: Normal Œ
TV controls: Normal Œ
TV controls: Normal Œ
TV controls: Normal Œ
G2 to minimum. Service Line •
TV controls: Normal Œ
Service Line •
Colour to minimum and rest of
controls in normal Œ
TV controls: Normal Œ
TEST ADJUSTMENT
POINT
B1 VR800 Adjust VR800 to obtain: +120V. ±0.5V
Cathode D-850
Adjust L201 to obtain a voltage of 3,5V. ±0,2V. Ž
AFC_OUT L201
R211 The aerial should be disconnected so that it does not
interfere with the applied IF signal
Pin AGC VR200 Adjust VR200 to obtain a voltage of
TU250 3,3V ± 0.2V.
CRT screen VR702 Adjust VR702 to make the picture cover the whole
screen vertically and to get the battlements are hidden
CRT screen R712 In case the picture is shifted up or down more than of
North R713 3mm. from screen centre, resistor R713 or R712
Orientation respectively should be cut. Readjust vertical size if
necessary.
CRT screen L654 Adjust L654 so that the picture covers the whole
screen horizontally and the battlements are hidden.
CRT screen VR600 Adjust VR600 to centre the picture in horizontal
direction. Readjust horizontal width if necessary.
CRT cathode VR503 Adjust VR503, VR504 and VR505 to obtain 110 Volt. ,
Chassis ground VR504 +/- 1,5 Volts.
VR505
CRT screen G2 Set the G2 voltage for one colour to be just visible
Potentiometer
CRT screen VR503 Adjust the potentiometers corresponding to those
VR504 cathodes that are not conducting, in order to obtain a
VR505 tenuous line without colour tone (White)
CRT screen VR501 The potentiometers must be adjusted in order to obtain
VR502 an acceptable colour tone. In case of doubt, they must
be adjusted to the same value of the divider R503/R504
CRT screen FOCUS Adjust to obtain the best possible focusing in the centre
of screen.
7
Service Manual CE14A1-E
SPECIAL FEATURES INSTRUMENT
DC Voltmeter
Resolution >0,1V.
IF Generator.
DC Voltmeter
Resolution>0,1V.
Pattern generator
DC Voltmeter
Resolution>0,1V.
Visual adjust
Visual adjust
Visual adjust
Visual adjust
DC Voltmeter
Resolution >0,1V.
Visual adjust
Visual adjust
Visual adjust
Visual adjust