Adjustment After Crt Replacement - Ikegami TM14-17R Service Manual

Then, remove the FRONT PANEL from an
escutcheon by removing the FRONT PANEL
fixing screws(M3
x
10).
ii) Disconnect the connector connecting the LED
BOARD on the upper side of the escutcheon
with the DEF & POWER BOARD..
@ Disconnect the connector connecting the
deflection york with the DEF & POWER
BOARD.
(J) Disconnect the connector connecting the
DEGAUSS coil with the DEF & POWER
BOARD.
@ Remove the eight screws (four screws on the
top and each two screws on the right and left)
which hold the main unit and escutcheon, and
remove the escutcheon from the main unit
together with the CRT.
Make sure that the neck of CRT does not touch
the main unit at this time.
®
Place the CRT on a stable surface with the
escutcheon down.. Place a cloth below the
escutcheon to prevent it from being damaged.
And remove the four screws which attach the
escutcheon to the CRT.
At this time, pay attention not to break screw
threads because the screw lock is painted on
screws.
@) Remove the degauss coil.
@ Prepare the new CRT and reassemble the unit
by following steps
CD
through @ above in
reverse order..
(4) Adjustment after CRT Replacement
CD
Tentative setting of SCR VR
i) Make sure that each connector is correctly
connected, paying special attention to the
connectors of anode cap, FOCUS and SCR.
ii) Set the SCR VR, which is close to the
components side of the PC board, of the flyback
transformer on the DEF & POWER BOARD to
its MIN. position.
iii) Connect the AC cable as well as the signal
cable and then turn the power on. At this time,
make sure that no troubles are found ..
iv) Rotate slowly the SCR VR clockwise to let
pictures appear on the screen and set the SCR
VR to the point where the luminance of the
pictures does not vary even when the SCR VR
is rotated ..
- 3 -
@
Setting of WIDTH, HEIGHT, etc. (Refer to
Table 1 of Scanning Size)
i) Perform the adjustments of scanning size,
linearity, pincushion distortion, raster position
and picture position in normal scanning, using
the following VRs.
*
VR202(NOR WIDTH)
VR204 (PIN LEVEL)
VR206(SIDE PIN PHASE)
VR207(H CENT)
VR209(V CENT)
*
VR905(NOR HEI)
VR904(V LIN)
VR908(H PHASE)
}
on the DEF
&POWER
BOARD
}
on the VIDEO
BOARD
ii) After the above adjustment is completed,
connect the probe to R248( collector side of
Tr215) on the DEF & POWER BOARD and
adjust VR903(V BIAS) so that the voltage of
waveform end of vertical deflection output can
be DC +SV.
iii) Perform the adjustments of scanning sizes in
under scanning and in 16:9 aspect ratio
scanning, using VR203 (US WIDTH) on the
DEF & POWER BOARD, VR906 (US
HEIGHT) and VR907(16:9 HEIGHT) on the
VIDEO BOARD.
Table 1 SCANNING SIZE