Toshiba M-V19H01 Service Manual page 122

Alignment and Adjustments (Electrical)
6-1-4 IC902 Replacement
1. When IC902 is replaced, all values are reset to
ÒInitialized MICOM Data,Ó so readjustment is
necessary.
2. Press the POWER button 10 seconds after
plug-in.
3. To enter the factory mode, refer to 5-1-2
(Factory Mode Adjustment).
6-1-5 PIF VCO Adjustment
1. Without connecting an antenna to the tuner,
feed a 45.75MHz signal to C104. Use a pattern
generator. Marked:
2. Adjust the VCO in the service mode; set IC200
Pin 44 (AFT) to 2.5V.
6-1-6 RF-AGC Adjustment
1. Input a PHILLIPS pattern (CH4).
2. Adjust the input signal so that it becomes
more than 60dB.
3. Enter AGC (Factory mode).
4. Adjust AGC so that IC200 Pin 5 is 4.57V.
Marked:
6-1-7 Sub-Contrast Adjustment
1. Input a gray scale pattern (CH4).
Use a pattern generator (PM5518).
2. Short D208 to disable the ABL feedback.
with an oscilloscope.
3. Using an oscilloscope, check IC200
Pin 19 (marked
4. Set the RC, GC, BC values to 0 (Factory
Mode). Check their initial values.
5. Adjust SCT to 2.4 ± 0.1Vp-p.
6. Remove the short across D208 in order to
restore the ABL feedback.
6-2
) R-OUT .
6-1-8 Sub-Tint Adjustment
1. Input a 7 color-bar pattern.
2. Using an oscilloscope, check IC200 Pin 21
(marked ) B-OUT.
In the factory mode, adjust STT until the 2th
and 3th peaks have equal heights.
6-1-9 Sub-Color Adjustment
1. Do the Sub-color adjustment AFTER the Sub-
Contrast and Sub-Tint adjustments.
2. Input a full color bar pattern.
Use a pattern generator (PM5518).
3. Check IC200 Pin 19 ( marked
with an oscilloscope.
4. Ensure that RC, GC and BC data are Ò0Ó;
GG and BG should be 128.
5. In the factory mode, adjust SCR to
2.0 ± 0.1Vp-p (black and red levels).
Fig. 6-1 Sub-Contrast Adjustment
) R-OUT