Sony service manual ResNV CC, 021ResOK?, 021Reset, MZ-N1 SECTION ELECTRICAL ADJUSTMENTS

MZ-N1

SECTION 5

ELECTRICAL ADJUSTMENTS

Outline

•In this set, automatic adjustment of CD and MO can be per- formed by entering the test mode.

However, before starting automatic adjustment, the memory clear, power supply adjustment, and laser power check must be performed in the manual mode.

•A key having no particular description in the text, indicates a set key.

•For the LCD display, the LCD on the remote commander is shown, but the contents of LCD display on the set are same.

Precautions for Adjustment

1.Adjustment must be done in the test mode only. After adjusting, release the test mode.

2.Use the following tools and measuring instruments.

• Test CD disc	TDYS-1
	(Part No. : 4-963-646-01)

•SONY MO disc available on the market

•Digital voltmeter

• Laser power meter LPM-8001

(Part No. : J-2501-046-A)

• Thermometer (using the Temperature Correction)

3.Unless specified otherwise, supply DC 3V from the DC IN 3V jack (J601).

4.Switch position

HOLD switch ............................................... ON

Adjustment Sequence

1.	NV Reset (EEPROM clear)	
			Manual Mode
	r
		
2.	Power Supply Manual Adjustment	
			Manual Mode
	r
		
3.	Temperature Correction (item number: 015)
	r	
			Manual Mode
4.	Laser Power Check
		
	r	
5.	Electrical Offset Adjustment	
Caution: This adjustment must be made with		
		
	no disc loaded.	
	r		Overall Mode
6.	CD Overall Adjustment	
		
	r	
		
7.	MO Overall Adjustment
	r		Manual Mode
		
8.	RESUME Clear
		

Note: If the version of the microcomputer is 1.000 or later, “3. Tempera- ture Correction” and “2. Power Supply Manual Adjustment” can be performed continuously in reverse order with pressing the [PLAY MODE] key on the remote commander in the overall adjustment mode.

NV Reset

Caution: The shipment data will be cleared when the NV is reset. Therefore, change the NV adjusted values following the Change of NV Adjusted Values immediately after the NV was reset.

Change the NV adjustment values according to the mi- crocomputer version.

• Setting method of NV reset

1.Select the manual mode of the test mode, and set item number 021 NV Reset (see page 14).

Remote commander LCD display

021 ResNV CC

2. Press the X key.

Remote commander LCD display

021ResOK?

3.Press the X key once more.

Remote commander LCD display

021Res***

NV reset (after several seconds)

021Reset!

4.Press the x/CHG key to quit the manual mode, and return the test mode (display check mode).

•Change of NV adjusted values (version 1.000)

Caution: Change the NV adjustment values according to the mi- crocomputer version.

In this set, some adjusted values were set in the manual mode at the shipment, but these will be cleared when the NV is reset. There- fore, modify the NV adjusted values through the following proce- dure immediately after the NV was reset.

1.Item numbers in which the NV adjusted values are to be modi- fied

–Change ABCD gain [Hpit] initial value (item number 336) Caution: The ABCD gain [Hpit] initial value must be changed before the overall adjustment.

–Change DFTC threshold value (item number 151)

–Turn off sound generation speed-up (item numbers 861 to 864)

–Change CLV drive voltage limiter (item numbers 865, 866)

–Change x2 CLV speed gain, +6dB compared to conventional (item numbers 867, 868)

–Change x2 CLV phase gain, +3dB compared to conventional (item numbers 871, 872)

–Change x2/x1 switching temperature threshold value (+10° C t +5° C) (item numbers 873, 874)

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