Service Mode (Test Mode); How To Enter The Test Mode; How To Release The Test Mode; Each Key Function In Test Mode - Sony D-V55 Service Manual

Portable video cd player

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Operating instructions manual (34 pages)

Table Of Contents

Table of Contents

• In this set, there are two test modes; CD-DA Test Mode and

VIDEO CD Test Mode.

4-1. How to Enter the Test Mode

1. Disconnect external power (no current is applied to the set).

2. Bridge the TAP801 (TEST) on the MAIN Board with a solder.

(IC801 (∞ (TEST) pin is shorted to the ground.)

3. Connect the external power.

4. The CD-DA Test Mode is activated. (LCD display varies in 5-

ways, and its 5-way display is repeated.)

5. Before connecting external power in step 3, if π (STOP) key

was pressed, the mode is switched to VIDEO CD Test Mode.

(On the LCD, all segments are displayed, and the video monitor

becomes 100% white.)

4-2. How to Release the Test Mode

1. Always disconnect external power, and break the solder bridge

of TAP801 (TEST) on the MAIN Board.

2. Thus, the set become ready for normal operation.

4-3. Each key Function in Test Mode

1. CD-DA Test Mode

Switches

Stop processing

Press once: Initialize, Average Correct

Press twice: Auto Focus

ﬂ

Press 3 times: Focus Auto Gain

(PLAY/PAUSE)

Press 4 times: Tracking Auto Gain

Press 5 times: All Servo ON, Mute OFF

Repeat once more the processing currently

SELECT

selected with ﬂ (PLAY/PAUSE) key.

Move optical pick-up toward outside track

(NEXT)

≠

Move optical pick-up toward inside track

(PREV)

Turn off the Mute

(RETURN)

Turn on/off the ESP (fast speed play, when

ESP

ON)

REPEAT/

Tracking Gain up/normal switching

ENTER

Raise K13* by one step after Focus Auto

Gain

Raise K23** by one step after Tracking

Auto Gain

Lower K13* by one step after Focus Auto

–

Gain

Lower K23** by one step after Tracking

Auto Gain

* Coefficient of Focus Gain

** Coefficient of Tracking Gain

SECTION 4