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7.ELECTRICAL ADJUSTMENT
A. Safety Precautions
1. It is safe to adjust after using insulating transformer between the power supply line and
chassis input to prevent the risk of electric shock and protect the instrument.
2. Never disconnect leads while the TV receiver is on.
3. Don't short any portion of circuits while power is on.
4. The adjustment must be done by the correct appliances. But this is changeable in view of
productivity.
5. Unless otherwise noted, set the line voltage to 220Vac
±
20%, 50/60Hz.
B. Adjusting items
1. Equipment, instruments and tools:
(1) One process assembling machine for 21" color TV
(2) One 100MHz oscilloscope
(3) One three-digit voltmeter
(4) One AC regulated power supply
(5) Factory standard signal cable input system
(6) One user remote controller
(7) One adjusting tool
2.
Adjusting method of main voltage (115V) and intermediate frequency detection
(38.9 MHz):
(1) Connect the main baseboard to a 21
″
factory-assembled color TV set and connect the
company’s adjusting signal.
(2) Switch on 220V AC main power supply and receive the electronic circular signal. Adjust
accelerating pole and focusing pole to appropriate position. Press the picture memory mode
button (PP) on the user’s remote controller to get into “MEMORY2” status.
(3) Ground the black rod of digit voltmeter and connect the red rod to R553. Adjust the
potentiometer RP501 (2K) until the digit voltmeter indicates 115 0.5 V.
(4) Use factory special remote controller for adjustment (V.) by pointing it to the baseboard
infrared receiver and pressing S-PVOC button. Then the factory-assembled color TV displays
AFT (dark field)---AFT OK (with signal or noise), intermediate frequency detection
(38.9MHz) adjustment finishes.
37
Summary of Contents for HS-2190
Page 31: ...Note the item marked have been adjusted on product line those may differ in different TV 31 ...
Page 40: ...Terminal view of transistors 2SC4237 2SD1879 2SA608 2SC536 2SB764 2SD400 40 ...
Page 43: ...C Circuit diagrams 43 ...
Page 61: ...Sincere Forever Haier Group Tel 86 532 8938356 Web site http www haier com ...