SONY MZG755
Manual de Servicio

MZ-G755 SECTION 4 TEST MODE
4-1. Outline
� This set provides the Overall adjustment mode that allows CD (PB) and MO (REC/PB) disk 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 automatically 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 set is shown.
C814 C809 FB801

4-3. 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 display.
This set LCD display
AM PM
BASS

All lit

88:88e

LP24 MONO SYNC REC F 1 SHUFF PGM REC DATE REMAIN

4-2. Setting Method of Test Mode
There are two different methods to set the test mode: 1 Short SL801 (TEST) on the MAIN board with a solder bridge (connect pin 3 of IC801 to the ground). Then, turn on the power.
All off

MAIN BOARD (SIDE B)

Microcomputer version display

Ver 1.300

00 5

� 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 microcomputer version 1.000, change the adjusted values following the Change of Adjusted Values immediately after the NV was reset (see page 18).

4-4. 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 18) has not been finished completely, always start in the test mode. (The set cannot start in normal mode)

R817

C821

C815 X801 AP828

R806 C808 C807

SL801 (TEST)
AP817

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

12