MZ-R900

SECTION 4

TEST MODE

Outline

This set provides the Overall adjustment mode that allows CD and MO discs to be automatically adjusted when in the test mode. In this overall adjustment mode, the disc is discriminate between CD and MO, and each adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allows each individual adjustment to be auto- matically adjusted.

Operation in the test mode is performed with the set. 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.

Setting Method of Test Mode

There are two different methods to set the test mode:

1Short SL801 (TEST) on the MAIN board with a solder bridge (connect pin 3 of IC801 to the ground). Then, turn on the

power.

– MAIN Board (Conductor Side) –

3

79

77

70

81

60

58

 

 

 

0

74

67

65

63

62

57

61

 

 

31 133 135 137

68

55

54

56

 

 

4

76

73

66

 

59

49

53

+

C830

 

 

 

 

 

44

50

47

 

 

 

 

 

 

 

 

 

 

 

 

35

36

45

 

 

 

 

 

 

 

31

30

51

L801

 

 

 

 

 

113

24

42

 

 

 

IC801

 

 

25

20

26

 

C809

 

 

 

28

16

40

 

 

 

 

 

 

 

 

 

 

 

 

 

23

17

38

 

+

 

 

 

 

 

 

 

 

 

 

 

 

21

15

34

C813

 

 

 

 

 

 

27

8

22

 

 

 

 

 

 

96

95

18

C801

SL801

 

 

 

 

 

19

4

9

 

 

 

 

 

29

2

7

(TEST)

 

 

 

 

 

 

 

 

 

 

 

6

1

3

 

 

 

 

 

 

48

10

5

 

 

 

 

 

 

 

241

12

11

 

 

Operation in Setting the Test Mode

When the test mode becomes active, first the display check mode is selected.

Other mode can be selected from the display check mode.

When the test mode is set, the LCD repeats the following dis- play.

Remote commander LCD display

All lit

888

BASS12

All off

 

 

Microcomputer

version 003 V1.000 display

Destination code

002 : Except US, Canadian models

003 : US, Canadian models

When the X key is pressed and hold down, the display at that time is held so that display can be checked.

Caution: On the set having the microcomputer version 1.000, some adjusted values were set in the manual mode at the shipment, but these data will be cleared when the NV is reset. Therefore, on the set having the micro- computer version 1.000, change the adjusted values following the Change of Adjusted Values immediately after the NV was reset (see page 17).

Releasing the Test Mode

For test mode set with the method 1:

Turn off the power and open the solder bridge on SL801 (TEST) on the MAIN board.

Note: Remove the solders completely. Remaining could be shorted with the chassis, etc.

For test mode set with the method 2:

Turn off the power.

Note: If electrical adjustment (see page 17) has not been finished com- pletely, always start in the test mode. (The set cannot start in nor- mal mode)

2In the normal mode, turn on the [HOLD] switch. While press- ing the [VOL --]key press the following order:

>t > t . t . t > t

. t > t . t X t X

12

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Sony MZ-R900 service manual Section Test Mode, Outline, Setting Method of Test Mode, Operation in Setting the Test Mode