High Voltage Adjustment; Final Assembly Adjustment (Adjustment Should Be According To Below Order); Cut Off Adjustment; Dcu Phase Data Setting (Normal And 1080I Throught Mode) - Hitachi 53SDX20BB Service Manual

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 = 30.2 ± 0.2kV
(2) After adjustment, fix VR RH17 with Silicone glue
(KE40RTV).
(FBT)
High Voltage Adjustment VR.
RH17
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).
FOCUS PACK
Screen VR
R
R
and should NOT
T702
CONV.
HEATSINK.
TH01
DEFLECTION PWB.
Focus VR
Screen VR
G B
Static Focus VR
G B
Adjustment procedure
(1) Press and hold INPUT key on control panel and
then POWER ON to access I
mode.
be
(2) Choose "SERVICE" item from I
menu by pressing CURSOR
(3) Screen VR should be turned clockwise gradually
and set so that retrace line begins to appear.
(4) Return to "NORMAL" mode by CURSOR
again.
(5) Adjust Focus VR's so that focus is even all
around screen.
2.2 DCU Phase Data Setting
Adjustment preparation
(1) Cut off adjustment should be finished.
(2) Set video conditions to factory preset.
Adjustment procedure
NORMAL MODE
(1) Receive any NTSC signal.
(2) Push "SERVICE ONLY" SW on CONV. FOCUS
PWB. (Enter to DCU ADJ. mode).
(3) Push HELP key on R/C. (Green cross hatch is
displayed).
Then push EXIT key on R/C. (Character pattern
is displayed. This is the PHASE setting mode).
(4) Set PH-H phase data as shown below by using
4 and 6 key on R/C.
(5) Set PH-V phase data as shown below by using
2 and 5 key on R/C.
(6) Set CR-H phase data as shown below by using
CURSOR
(7) Set CR-V phase data as shown below by using
CURSOR
(8) Push HELP key on R/C to exit from the PHASE
mode.
(9) Push PIP MODE key 2 times on R/C to write the
phase data to memory.
(10) When Green dots are displayed, push MUTE
key to return to DCU ADJ. mode.
(11) Push "SERVICE ONLY" SW to return to RF or
VIDEO mode.
1080i THROUGH MODE
(12) Receive any 1080i signal (Input to Component
video terminal). Select "Aspect 5" on SET-UP,
PICTURE FORMAT of OSD MENU.
(13) Repeat steps (2) ˜(11) above.
NORMAL MODE
PHASE MODE
PH-H :BF
PH-V: 07
CR-H: 4C
CR-V: 0C
23
2 C adjustment
2 C adjustment
.
and key on R/C.
and key on R/C.
1080i THROUGH MODE
PHASE MODE
PH-H: BF
PH-V: 07
CR-H: 4C
CR-V: 0C