Sony KV-21SE43C, KV-20S90 service manual Circuit Adjustments

KV-20S90 / 21SE43C

SECTION 4: CIRCUIT ADJUSTMENTS

ELECTRICAL ADJUSTMENTS BY REMOTE COMMANDER

Use the Remote Commander (RM-Y155) to perform the circuit adjustments in this section.

Test Equipment Required: 1. Pattern generator 2. Frequency counter 3. Digital multimeter 4. Audio oscillator

4-1. SETTING THE SERVICE ADJUSTMENT MODE

1.Standby mode (Power off).

2.Press the following buttons on the remote commander within a second of each other:

Display Channel 5 Sound Volumne + Power

SERVICE ADJUSTMENT MODE ON

1. The CRT displays the item being adjusted.

Display Item

Mode Item Data

SERVICE HSIZ 0

2.Press 1 or 4 on the Remote Commander to select the item.

3.Press 3 or 6 on the Remote Commander to change the data.

4.Press MUTING then ENTER to write into memory.

SERVICE ADJUSTMENT MODE MEMORY

Mode
		MUTING	Green
SERVICE	WRITE
		ENTER	Red

1. Press 8 then		ENTER	on the Remote Commander to initialize.
Mode
	SERVICE	RESET		Carry out Step 1 when adjusting
				IDs 0-7 and when replacing and
				adjusting IC003

4-2. MEMORY WRITE CONFIRMATION METHOD

1.After adjustment, pull out the plug from the AC outlet, then replace the plug in the AC outlet again.

2.Turn the power switch ON and set to Service Mode.

3.Call the adjusted items again to confi rm they were adjusted.

4-3. REMOTE ADJUSTMENT BUTTONS AND INDICATORS

		MUTING		POWER
		(Enter into
				(Service Mode)
	memory)
	DISPLAY		3
	(Service Mode)
			Item (Data up)
1			6
	Disp. (Item up)
2			Item (Data down)
(Device Item Up)			5
			(Device item down)
4
				ENTER
Disp. (Item down)
			(Enter into
			memory)
8
		(Initialize)	0
			(Remove from
			memory)
	VOLUME (+)
	(Service Mode)

RM-Y155

2. Turn set off then on to exit service adjustment mode.

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