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Service Mode Adjustments
ADJUSTMENT-1
Following adjustments
should be carried out when the memory IC is replaced. How to enter the service mode and
adjust values, please refer to" Entering to Service mode" on page 12.
(1) Receive the monochrome
circular pattern.
(2) Set the brightness
and contrast to normal.
(3) Select [H-P] in the service mode.
(4)
Change value to be optimum horizontal centre position.
(5) Exit from the service mode.
Q
Horizontal centre
o
(1) Receive the monochrome
circular pattern.
(2) Set the brightness
and contrast to normal.
(3) Select [V-P] in the service mode.
(4) Change value to be optimum vertical centre position.
(5) Exit from the service mode.
Vertical centre
(1) Receive the monochrome
circular pattern.
(2) Set the brightness
and contrast to normal.
(3) Select [V-S] in the service mode.
(4) Change value to be optimum vertical size.
(5) Exit from the service
morje.
Vertical size
(1) Receive the monochrome
circular pattern.
(2) Set the brightness
and contrast to normal.
(3) Select [OSD] in the service mode.
(4) Change value to be proper OSD position.
(5) Exit from the service mode.
NOTE: Do not attempt this adjustment
with weak signal.
(1) Tune the receiver to most clearest
(or strongest)
VHF
station
in your area. Set the brightness
and contrast
controls
to maximum.
Set the colour control
to mini-
mum.
(2) Select [AGC] in the service mode.
(3) Change value until the snow noise just disappears.
(4) Exit from the service mode.
(1) Input the SG signal to collector of Q101.
SG signal frequency
: 38.9 MHz
SG signal level
:70 dB
(2) connect a short clip between the baseofQ101
and
-
ground.
(3) Connect oscilloscope
to pin 2 of IC201.
(4) Select [VCO] in the service mode.
(5) Change value until the voltage to be 4.5 * 1.OV.
(6) Exit from the service
mode.
(1) Tune the receiver to the clearest
station with System
B/G(5.5MHz)
in your area.
(2) Connect DC voltmeter to pin 46 of IC201 and ground.
(2) Select [SIF] in the service mode.
(3) Change value until the voltage to be about 3.0 V.
(4) Exit from the service mode.
-
-14-
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