Comb Filter Operation Check; Video Settings Check; Color Temperature Check; High Voltage Adjustment - Hitachi 51F710 Service Manual

1.2 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
Check and line dots.
B
3D Y/C
A None
B None
1.3 Video Settings (Advanced Settings) Check
1.3.1 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
press Select button.
(2) Select Color Temperature option using the
buttons and press Select button.
(3) Select MEDIUM using
turn reddish slightly.
(4) Select STANDARD using
will turn more reddish.
(5) Select Black & White using
will turn more and more reddish.
(6) Select HIGH using
bluish.
BACK TO ADJUSTMENTS
A A
B
Dots
buttons and
buttons and Picture will
buttons and Picture
buttons and Picture
buttons and Picture will turn
Important: High Voltage adjustment should
!
NOT be adjusted in field. This is
adjusted at factory using precise
loads
readjusted.
1.4 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:
Adjustment preparation
1. Allow 20 minutes pre-heat run.
(1) Adjust screen VR's on Focus Pack fully
2. Set video conditions to factory presets.
counterclockwise.
(2) Adjust Focus VR's on Focus Pack fully
Adjustment Procedure:
clockwise.
1. Access the I2C Adjustment Mode
(3) Set video conditions to factory preset.
(4) The vertical incident illumination on the screen 1.1 On the front panel, press and hold the INPUT
should be 20 lux or less (room should be dark).
button, then press the POWER button; release
(5) Pre-heat run time should be at least 20 min.
both after hearing HV startup.
2. Select SERVICE from adjustment menu by
FOCUS PACK
pressing the button on the remote. This will
collapse the vertical deflection.
3. Turn all screen (G2) controls to the full
counter-clockwise position.
5
and should NOT
High Voltage Adjustment VR.
RH17
CONV. P.W.B.
DEFLECTION PWB.
CH 5
DP45
be