Focus Adjustment; G2 (Screen) And White Balance Adjustments - Sony TRINITRON KV-PG14P70 Service Manual

(3) Screen-corner Convergence
b
a-d : screen-corner
misconvergence
c
Fix a Permalloy assy
corresponding to the
misconverged areas
a to d : Permalloy assembly

3-3. FOCUS ADJUSTMENT

FOCUS adjustment should be completed before W/B adjustment.
1. Receive digital monoscope pattern.
2. Set "Picture Mode" to "DYNAMIC".
3. Adjust focus VR so that the center of screen becomes
just focus.
4. Change the receiving signal to white pattern and blue back.
5. Confirm magenta ring is not noticeable. Incase magenta is
very obvious, adjust focus VR to take balance of magenta
ring and focus.
FLYBACK TRANSFORMER (T503)
3-4. G2 (SCREEN) AND WHITE BALANCE
1.
a
1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C board cathode to the
d
4) Adjust BRIGHTNESS to obtain the cathode voltage to the
5) Adjust G2 (screen) on the FBT until picture shows the point
b
2.a) WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 4-1: ADJUSTMENTS
2) Input white raster signal.
3) Set 49 (ABL) and IF (VP2) service mode to 00.
4) Set Picture to DYNAMIC.
5) Select OB (RDR) with [1] and [4], and set the level to 25
6) Select OC 'GDR' and OD 'BDR' with [1] and [4], and adjust
7) Write into the memory by pressing [MUTING] then [0].
8) Set back 49 'ABL' and IF 'VP2' service mode to original data.
2.b) SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Set 49(ABL) and IF (VP2) service mode to 00
3) Input a staircase signal of black to white from the pattern
4) BRIGHTNESS .... 50%.
5) Select OE 'SBR' with [1] and [4], and adjust OE 'SBR' level
6) Write into the memory by pressing [MUTING] then [0].
7) Set back 49 (ABL) and IF (VP2) service mode to original data.
FOCUS
SCREEN
– 17 –
KV-PG14P42/G/L/N/PG14P70
ADJUSTMENTS
G2 (SCREEN) ADJUSTMENT
oscilloscope.
value below.
before cut off.
Cathode setting voltage:
175 V ± 2 (VDC)
WITH COMMANDER).
with [3] and [6] for best white balance.
the level with [3] and [6] for the best white balance.
generator.
PICTURE ............ MINIMUM
with [3] and [6] so that the second stripe from the right is
dimly lit.
White
KV-PG14M40/PG14M72/L/N
0 V
second from the right
Black
RM-952