Marantz MAR775, MAR770, DR-6000 service manual DC-erase service mode, Erasement of complete CD-RW

6.4.2 Requirements to perform the test 6.5.1 Description

Working keyboard to cycle through the tests and to start up the test.

Working local display to check the output messages.

6.4.3Description of the tests

Focus control test

The focussing lens is continuously moving up and down. The display reads "BUSY".

Sledge control test

After pressing [F FWD] the sledge continuously moves up and down. Pressing [REWIND] stops the sledge at the position it is in and the focus control test resumes. The display reads "BUSY".

Tray control test

This test starts from within the focus control test routine. Pressing [OPEN/CLOSE] moves the tray in or out. In the tray open position one can initiate focus and sledge tests by pressing [F FWD]. One has to stop these tests pressing [REWIND] before it is possible to close the tray again. Depending on the action the display reads "OPEN", "OPENED", "CLOSE" or "BUSY".

6.5DC-erase service mode

DC ERASE SERVICE MODE

(erasement of complete CD-RW)

This test is initiated by pressing [ERASE] and [RECORD] simultaneously while switching on the unit. The player will erase a complete CD-RW disc (including PMA and ATIP lead out area) at speed N=2. The display shows the countdown of the remaining time required for the operation to complete. The format is "ER mm:ss", where "mm" are the remaining minutes and "ss" the remaining seconds. After completion the message "PASSED" is shown, and the player has to be switched off and on again to start up in normal operating mode. Switching off the unit before completion of the test, leaves the disc in an unpredictable state. In such case only a complete DC-erase procedure can recover the CD-RW disc.

6.5.2Requirements to perform the test

Functional CDR player.

A CD-RW audio disc must be present in the tray.

Load CD-RW disc

Press

<ERASE> + <RECORD>

simultaneously and switch ON unit

Display shows:

“ER mm:ss”

mm:remaining minutes

ss :remaining seconds

TOTAL and REM are also illuminated

Display shows:

“PASSED”

when the erase function is completed

“ERROR”

if DC ERASE fails

To end test, switch OFF unit

CL96532086_027.eps 080999

Figure 6-4

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