Sony MZ-R900 service manual Adj Ok, SetTmp, HrefPw, WritPw, Laser, LrefPw, Temperature Correction

2.When press the X key to write the adjusted value, LCD dis- plays as follows and power supply manual adjustment has com- pleted.

Remote commander LCD display

000 ADJ OK

Adjustment and Connection Location: MAIN board

Temperature Correction

• Adjustment Method of temperature correction

1.Select the manual mode of test mode, and set the mode num- ber 014 (see page 13).

Remote commander LCD display

014 SetTmp **

**: Adjusted value

2.Measure the ambient temperature.

3.Adjust with [VOL +], [VOL --]key so that the adjusted value

(hexadecimal value) becomes the ambient temperature. (Initial value: 14h = 20 ° C, Adjusting range: 80h to 7fh (–128 ° C to +127 ° C)

4.Press the X key to write the adjusted value.

Laser Power Check

Connection :

laser power meter

Optical pick-up objective lens

digital voltmeter

MZ-R900

7.Press the N key, and set the laser CD read adjustment mode (item number 012).

Remote commander LCD display

012 HrefPw **

8.Check that the laser power meter reading is 0.97 ± 0.10 mW.

9.Check that the voltage both ends (TP (+) and TP (–)) of resistor R521 at this time is below 44 mV.

10.Press the N key, and set the laser MO write adjustment mode (item number 013).

Remote commander LCD display

013 WritPw **

11.Check that the laser power meter reading is 4.95 ± 0.50 mW.

12.Check that the voltage both ends (TP (+) and TP (–)) of resistor R521 at this time is below 80 mV.

13.Press the x key to quit the manual mode, and activate the test mode (display check mode).

Checking and Connection Location: MAIN board

Adjustment/checking and Connection Location:

– MAIN Board (Conductor side) –

AP912	AP914
(GND)	(VC)

AP915

(VL)

MAIN board

TP (+)

TP (–)

Checking Method :

1.Select the manual mode of test mode (see page 13), and set the laser power adjusting mode (item number 010).

Remote commander LCD display

	010 Laser
2.	Press the				key continuously until the optical pick-up
			.
	moves to the most inward track.
3.	Open the cover and set the laser power meter on the objective
	lens of the optical pick-up.
4.	Press the			key, and set the laser MO read adjustment mode
		N

C325

R307

R317

C326

C211

R318

R212

R211

C111

R111

C340

C330

R302

C210

Q302

S

R306

R112

C110

D

C323

G

C336

C314

C116

C118

C203

C103

+

C112

C117

5

4

1

16

R118

C212

R305

IC303

13

28

22

R304

8

C101

1

21

9

12

+

IC301

R102

R101

7

15

C318

C320

R218

C216

C102

C912

C913

C217

C202

R201

+

8

14

C218

R202

C306

C303

C304

C201

C305

C302

+

C301

C914 K

C910

R319

L302

L301

C327

+

C345

+

Q904

D902

C315

G

A

L303

C344

+ C904

R916

+

C927

R920

D303

C316

R309

KA

C925

C924

C923

S

D

+

C922

K

A

R310

14

1

C926

4

1

C906

D903 15

56

R941

5

16

R301

R942

R910

C918

R303

R905

R909

8

IC302

13

R816

R815

R904

R932

9

12

C908

C921

IC901

+

+

R813

R903

C905

R918

R902

R917

	4	3
	IC902
	1	2
C909		C928
C915
R919
R916	R914

R521

CN502

15		10	5	1
	42			29
43				28

				IC551
										C
56									15
	1								14
				C521
	C525						R501
									C501
	C524		+
				C529			R502
	+		E B				C531	R507
		R519		Q501	C			C503
L502						C518			C504
			L501
						+
								C505
						C526		C506
								C507

(item number 011).

C105	C205	C331		R915					R911
			FB301		K	A	28	43

TP (+)

TP (–)

Remote commander LCD display

011 LrefPw **

5.Check that the laser power meter reading is 0.81 ± 0.08 mW.

6.Check that the voltage both ends (TP (+) and TP (–)) of resistor R521 at this time is below 44 mV.

FB303

FB302

D904

FB304

C319

C328

C337

FB305

C333

C

F801

D301

C324

Q803

FB306

B

E

C317

K

A/K

R811

C825

D302

C338

C329

A

C335

R103

C106

R204

R104

C206

C207

R203

B1

E B2

R205

Q801

R105

C836

C107

R846

C2

C1

1

5

10

15

18

CN801

29	D901				42	+	C919
A		K	C902	R949
			+		R912	+ C920
					R901
C901		+
					R906	R946
				R947			+	Q903
					R948		C911
				R936	R913			B C E
				TH601				R603	C605
		C601							R602
		A		K					C602

D602

D605

AK

C837

R622

C633

J601

DC IN 3V

– +

19