Sony FDL-PT22/JE service manual HUE Adjustment, Gradation Adjustment

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3-3. B BOARD ADJUSTMENT

HUE ADJUSTMENT

- B BOARD - (COMPONENT SIDE)	(1)	Receive a color bar.
	(2)	Insert an oscilloscope between JL81 (B) and JL67 (D.GND).
RV301	(3)	Arrange RV301 as shown in Fig.3-5.

RV402

GRADATION ADJUSTMENT

Fig.3-5

(1)Input a 10-step staircase signal from the test signal generator.

(2)Connect an oscilloscope probe between JL83 (G) and JL67 (D. GND) and observe the waveform.

(3)The contrast should change when RV402 is turned.

(4)Connect the oscilloscope prove between JL84 (AUTO CB) and

JL67 (D. GND), and observe the waveform. Adjust RV402 so that voltage A is 2.2±0.2V

(5)Check that the waveform between JL84 and JL67 is as shown in Fig.3-4.

(6)Check to see that the phases C and D are within the range speci- fied (↔).

		100 IRE

					Picture contrast


JL83					is varies.
					is varies.

0 IRE

D

C

JL84

A = 2.2 ± 0.2V

Fig.3-4

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Contents LCD Color TV Specifications Disassembly Table of ContentsDiagrams Circuit AdjustmentsPower Sources see fig. a GeneralExternal Antenna Connection see fig. C Cabinet Removal Section Disassembly2Channel button 1Screw Hooks +P2 x Service Position CN602 Board Service cord CN201 AntenaSection Circuit Adjustment Board AdjustmentRF.AGC Adjustment AFT AdjustmentChannel Display Position Adjustment HUE Adjustment Gradation AdjustmentSection Diagrams Block DiagramBoard IC Voltage List Printed Wiring Boards and Schematic DiagramsCircuit Boards Location Board TransistorDiode BoardBoard IC001 AN5707NFAP TransistorAudio AMP Variable Resistor Board Transistor Voltage ListChroma LCD CHROMA,LCD Interface Chassis Section Exploded ViewsSemiconductors 685-104-19 +P2Electrical Parts List SectionREF. no Description Resistor Block FDL-PT22