Orion TC1973D, Service Manual

Page: 4 / 36

ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and these adjustments when repairing the
circuits or replacing electrical parts or assemblies.
CAUTION
Use an isolation transformer when performing any
on this chassis.
1. CUTOFF
2.
3.
AUTO
4. X-RAY
5. CONT
8. END
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
Inferior grease can damage and transistors.
When replacing and transistors. use only specified
silicon grease
Remove all old silicon before applying new silicon.
1-l: Prepare the following measurement tools far
electrical adjustments.
Sweepmarker Generator
2. Oscilloscope
3. Digital Voltmeter
4. Color Bar Generator
L
Fig.
AUTO
2 . v c o
3. AFT
4. AGC
5.
6. TINT
7.
8. END
2. BASIC ADJUSTMENTS
Fig. 2-3
On-Screen Display Adjustment
t h e a s t r a i g h t e n e d p a p e r c l i p i n t o t h e h o l e
on r e m o t e c o n t r o l m a r k e d w i t h a n a r r o w a s s h o w n
2-1: VCO AND AFT
NOTE
Connect input and output terminals of the
sweepmarker generator to the circuit as shown
in Fig. i t .
F i g . 2 - f .
The adjustment mode display will appear as shown
NOTE
Use the keys on the remote control to select the
options shown in Fig. 2-2 and Fig. 2-3.
Press the 8 key to end the adjustments.
Fig. 2-l
SWEEPMAKER
GENERATOROUTPUT
0.22
GND
SWEEPMAKER
G E N E R A T O R I N P U T
Fig. 2-4-z
Connect output terminal sweepmarker generator to
2. Connect input terminal of the sweepmarker generator to
TP204.
3. Connect a ohm variable resistor to IF AGC terminal
line and ground. adjust to make the
the oscilloscope readable