Hitachi CL32W30TAN Wartungshandbuch Seite 8

FOR FEATURE BOX (A8 ONLY)
5V & 8V SHORT CIRCUIT CHECK USING FEATURE BOX BOARD
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Measure the resistance between 5V (EU11, pin1) and GND (EU11, pin3) by multi-meter. If the meter shows 62.5 ± 4Ω,
The FEATURE BOX is OK.
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Measure the resistance between 8V (EU11, pin6) and GND (EU11, pin3) by multi-meter. If the meter shows 1.29 ± 0.1kΩ,
The FEATURE BOX is OK.
If these resistance are not correct, Please check solder bridge or solder losing around IU03 (SDA9272).
FEATURE BOX OPERATION CHECK
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Fit FEATURE BOX onto main board.
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Receiving circle pattern (PAL), checking the picture quality. Check: Horizontal line is stable (see horizontal line). <-----
Only for 2897,W35 models Colour bar part is correct (see colour bar). White part of picture is pure white(see greyscale).
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Check the progressive scan/100Hz operation by handset (scan-key) <----Only for 2897,W35 models.
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Change sharpness , CTI , compression (14:9, 4:3 & zoom), noise reduction (low, mid & high) by handset. Check the total
performance. Whenever digital noise is appears on the picture, or miss operation occurs, reject the feature box.
Receive an NTSC signal , check same items as PAL.
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