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ADJUSTMENTS
CHECK ITEM
Measuring
Item
instrument
POWER
Signal
generator
SUPPLY
Check
DC voltm eter
Remote
control unit
VOLTAGE
Signal
Check
generator
DC volunteer
Remote
control unit
ADJUSTMENT OF FOCUS
Measuring
Item
instrument
FOCUS
Signal
Ad justment
gener ator
Test point
Ad justment part
TP-91(B1)
TP-E(" " " " )
[X connector
on POWER
DEF PWB]
CRT anode
Chassis GND
Test point
Ad justment part
FOCUS VR
[In FBT]
FOCUS VR
SCREEN VR
No. 51941
Description
1. Receive a any broadcast.
2. Push the "ZOOM" key and s elect the FULL mode.
3. Select 2.V/C from the SERVICE MENU.
4. Select 1. CUT OFF with Function UP/DOW N k ey.
5. Show one horizontal line with the 1 key.
6. Turn the SCREEN VR, the whole black screen display.
7. Connect a DC voltmeter to TP-91(B1) and TP-E( " ).
8. Make sure that the voltage is DC143.0V ± 2.0V.
9. Readjust the SCREEN VR to appear the horizontal line faintly,
and cancel the horizontal line to press the 2 key.
1. Receive a any broadcast.
2. Push the "ZOOM" key and s elect the FULL mode.
3. Select 2.V/C from the SERVICE MENU.
4. Select 1.CUT OFF with Function UP/DOWN key.
5. Show one horizontal line with the 1 k ey.
6. Turn the SCREEN VR, the whole black screen display.
7. Connect a DC voltmeter to CRT ANODE and chassis GND.
8. Make sure that the voltage is DC 31.0kV
9. Readjust the SCREEN VR to appear the horizontal line faintly,
and c onnect the horizontal line to press 2 key.
Description
1. Receive a cross-hatch signal. Select FULL mode.
2. While watc hing the screen, adjust the FOCUS VR to make the
vertical and horizontal lines as fine and sharp as possible.
3. Make sure that when the sc reen is darkened, the lines remain
in good focus.
AV28R25EKS
AV28R250EKS
+1kV
.
-1.5kV
17
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