Hitachi 51F710A/DP55, Руководство по обслуживанию

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28
DP
55
1.3 Comb filter operation check
Adjustment preparation
(1) Receive the color bar signal at the regular tuning
point.
(2) Set the CONTRAST control to MAX and the other
controls to center.
Adjustment procedure
(1) Check line dots condition at border of each color A, B
as follows.
A A A
B
3D Y/C
Dots
A None
B None
Check and line dots.
B
A
BACK TO ADJUSTMENTS
1.4 Video Settings Check
1.4.1 Color Temperature Control Check
Adjustment preparation
(1) Receive the white raster signal.
(2) Set the video controls to normal conditions.
Adjustment procedure
(1) Select the Video mode using the
GH
buttons and
press Select button.
(2) Select Color Temperature option using the
GH
buttons and press Select button.
(3) Select MEDIUM using
FE
buttons and Picture will
turn reddish slightly.
(4) Select STANDARD using
FE
buttons and Picture
will turn more reddish.
(5) Select Black & White using
FE
buttons and Picture
will turn more and more reddish.
(6) Select HIGH using
FE
buttons and Picture will turn
bluish.
Important: High Voltage adjustment should
NOT be adjusted in field. This is
adjusted at factory using precise
loads and should NOT
be
readjusted.
1.5 High Voltage Adjustment (should NOT be
readjusted in field).
Adjustment preparation
(1) Connect High Voltage meter to FBT High Voltage
output. Connect GND of High Voltage meter to CPT
GND or FBT GND.
(2) Check that High Voltage adjustment VR (RH17) is
set to mechanical center. (located behind FBT on
DEFLECTION PWB).
(3) Receive circle pattern signal.
(4) VIDEO control should be reset.
Adjustment procedure
(1) Adjust High Voltage to following spec. by turning VR
RH17 slowly. ADJ. SPEC = 31.7KV±0.2kV.
(2) After adjustment, fix VR RH17 with Silicone glue
(KE40RTV).
2. FINAL ASSEMBLY ADJUSTMENT
2.1 Cut Off Adjustment
Adjustment preparation
(1) Adjust screen VR’s on Focus Pack fully
counterclockwise.
(2) Adjust Focus VR’s on Focus Pack fully
clockwise.
(3) Set video conditions to factory preset.
(4) The vertical incident illumination on the screen
should be 20 lux or less (room should be dark).
(5) Pre-heat run time should be at least 20 min.
!
DEFLECTION PWB.
RH17
High Voltage Adjustment VR.
T
H
0
1
(F
B
T
)
FOCUS PACK
Adjustment Preparation:
1. Allow 20 minutes pre-heat run.
2. Set video conditions to factory presets.
Adjustment Procedure:
1. Access the I2C Adjustment Mode
1.1 Press the following buttons on the remote, in
sequence: MENU, MENU, 8, SELECT.
2. Select SERVICE from adjustment menu by
pressing the button on the remote. This will
collapse the vertical deflection.
3. Turn all screen (G2) controls to the full counter-
clockwise position.
CH 2