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ADJUSTMENT PROCEDURES
[Deflection Circuit]
Adjustment
Set the oscillating frequency in a horizontal synchronizing circuit.
purpose
1. Horizontal Free Run
Frequency
Symptom when
incorrectly adjusted
Horizontally shifted picture.
Measuring
Instrument
Test Point
External Trigger
Measurement
Range
Input Signal
Frequency Counter
+Side: TP1 H, TP2H
-Side: TPGND
VG814 (No.11)
OPTION2
Input Terminal Mini D-SUB 15 Pin Input Terminal
PCB-AFC (Component side)
TPGND
Cl)TP2H
) IC5C1
I
TP1H
G
§ ]
VRSC1
Clll
1. Set VR5C1 to the center position.
2. Supply an OPTION2 signal (No. 11).
3. Connect"+" side on the frequency counter to TP2H. And connect"-" side to
TPGND.respectively to turn on the power.
4. Respectively to turn the power on.
5. Adjust VR5C1 with no signal supplied· so that the frequency counter is 24.39±
0.01kHz.
[High-voltage Circuit]
2. High Voltage Control
Adjustment
Set high-voltage to be applied to the CRT.
Measuring
Instrument
Test Point
"--. External Trigger
. ...;'Measurement
Range
Input Signal
purpose
Symptom when
incorrectly adjusted
Too widened or narrowed picture or too bright or dark picture.
DC Voltmeter
1. Supply a Full Black signal (No.18).
2. Connect"+" side on the DC voltmeter to
CD
pin of Connector OS. And connect
+Side:
(j)
pin of Connector DS
"-"side to® pin of Connector OS and measure the voltage.
- Side:® pin of Connector DS
3. Adjust VR501 so that the voltage is 19.85 ± 0.02V.
VG814 (No.18)
Full Black
Note ; After adjustment, fix VR501 with hot melt adhesive so as not to be
readjusted and fluctuated.
Input Terminal Mini D-SUB 15 Pin Input Terminal
PCB-DEFL (Component side)
B
T502
ffi
VR501
-18-
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