SONY MZE55
Service Manual

SECTION 4 TEST MODE
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. Setting the Test Mode 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 p key on the set, press the following remote commander keys in the following order : +n+n=n=n+n=n+n =nPnP 2. Entering method by shorting the test point Solder bridge the test point TAP801 (TEST) on the main board (connect IC801 pin #� to GND), and turn on the POWER.
[MAIN BOARD] (Conductor side)

Configuration of Test Mode The test mode has the configuration given below.
VOL + key p key Overall adjustment mode (Auto?) p key p key VOL � key p key Adjustment � key mode (Manu ?) Servo mode 000 +, � keys Audio mode 100 +, � keys Power mode 300 Displays of the LCD on the remote commander are shown in parentheses. � key

(Start ?)

TAP801

Servo Mode � Set the test mode, press the VOLUME � key and use the � key to set the servo mode. � When the servo mode is set, use the + 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
is set
Servo mode 000 p key � key

Display when test mode

Offset adjustment 010

� key

Test mode Short : Test mode Open : Normal mode

p key

011 to 013 *1 � 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 TAP801 (TEST MODE) on the main board. Operation of Setting on Test Mode

p key

Laser power adjustment 020

� key

p key
+, � keys

021 to 024 *1 � key

When the test mode is set, the LCD displays the following :
1

2 (See page 8.)

3

V2. 000
ROM version display LCD on remote commander

� The cycle - the above ROM version display n All lit n 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.

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

�7�

+, � keys