SONY MZE75
Service Manual

R818

SECTION 4 TEST MODE
Configuration of Test Mode The test mode has the configuration given below.
VOL + key x key Overall adjustment mode (Auto?) x key x key VOL � key x key B/> Adjustment key mode (Manu ?) B/> key

TP852 03

Outline � In this set, overall adjustment mode is made available by entering test mode to perform automatic adjustment of CD and MO. In the overall adjustment mode, the disc is determined whether it is CD or MO and adjustments are performed in sequence. If a fault is found, the location of the fault is displayed. Also, in servo mode, each adjustment can be automatically made. � Operation in the test mode is performed with the Remote Commander. A key having no particular description in the text, indicates a Remote Commander key.
RB801

552

(044 Start ?)

Setting the Test Mode

Servo mode 000 +, � keys Audio mode 100 +, � keys Power mode 300

To enter the test mode, two methods are available : 1. Entering method with key input. Turn on the HOLD switch on the set. While holding down the x key on the set, press the following remote commander keys in the following order : B/> t B/> t . t . t B/> t .t B/> t . t X t X 2. Entering method by shorting the test point Solder bridge the test point TAP805 (TEST) on the main board (connect IC801 pin ed to GND), and turn on the POWER.
[MAIN BOARD] (SIDE B)
4 70 65 80
R807

C565

Display when test mode is set

Displays of the LCD on the remote commander are shown in parentheses.

75

5 TP8061 61 60 55 TP811 50 45 41
S8 AV LIMITT

Servo Mode � Set the test mode, press the VOLUME � key and use the B/>
VOL
S DIGITAL S 2T

R802 R801

R

1 5 10

�

key to set the servo mode. � When the servo mode is set, use the B/> key and the . key to move the optical pick-up to the outer circumference and to the inner circumference respectively. � When entering another mode, refer to the configuration of test mode. 1. Structure of Servo Mode
Servo mode 000 x key B/> key
+, � keys

IC801

SP806 SP805

807 UME+

R804

X801

15 20 21 C805 25 30 35 40

Offset adjustment 010

SP804 R808

TAP805 (TEST)

RB802

B/> key

Test mode Short : Test mode Open : Normal mode

x key

011 to 013 *1 B/> key

Releasing the Test Mode 1. When test mode was entered with key input, turn off the POWER. 2. When test mode was entered by shorting the test point, turn off the POWER and open the solder bridge of TAP805 (TEST MODE) on the main board. Operation of Setting on Test Mode When the test mode is set, the LCD displays the following :
1

x key

Laser power adjustment 020

B/> key

x key

021 to 023 *1 B/> key

2 (See page 7.)

3

100V1. 000

F SHUF

ROM version display LCD on remote commander

*1 Repeatedly press B/> key to change the mode. (Refer to the following list for a description of each mode.)

� The cycle - the above ROM version display t All lit t All off - is repeated. (The ROM version is constantly displayed.) � When the PLAY MODE key is pressed and hold down, the display at that time is held so that display can be checked.

�6�

VOL +, � keys