4 mechanical service diagnostics – Marantz MAR770 User Manual

Page 10

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8

6.3.1

Description

The intention of the electrical service diagnostics is to show the
software versions present in the player and to direct the dealer
towards defective internal units. The units are : the CDR main
board, the CDR loader, the CD loader in case of a DR6050 and
the keyboard/display board. A sequence of tests is executed
automatically. Some of the tests can be aborted or skipped
without the result being taken into account. External tools or
disassembly of the unit is not necessary to get the diagnostic
information. Pressing keys [PLAY/PAUSE] and [F FWD]
simultaneously while switching on the unit, starts the test.
Switching off the unit ends the test.

6.3.2

Requirements to perform the test

Working keyboard to start up the test.

Working local display to check the output messages.

A CD-DA disc with a minimum of 3 tracks in all trays to

perform the disc test.

6.3.3

Description of the tests

Player information
In this part of the test the following important information can be
checked without removing the cover :
Recorder

ID.

SW-version back end of player.

SW-version CDR loader.

SW-version CD loader (only for DR6050).

CDR main board test
[F FWD] key. The message "DERRn" will be displayed with n
indicating the faulty test number.
If one of the tests is aborted with the [F FWD] key, no error
message will be displayed for this test. The flash data erase
test ("DTST3") can not be aborted !
The CDR main board test consists out of :

DRAM test
Display : "DTST1". The DRAM used for buffer management is
tested by writing, reading and verifying test patterns.

Flash checksum test
Display : "DTST2". This test checks the checksum of the
player's SW stored in the flash.

Flash data erase
Display : "DTST3". During this test, all temporary information
(CDtxt) in the flash is erased.

CODEC (ADC/DAC) test
Display : "DTST4". This test checks the CODEC IC by writing,
reading and verifying test patterns. The test is not applicable for
CDR950.

CDR communication test
Display : "DTST5". The communication between the host
processor (DASP) and the CDR loader via the DSA-R-bus is
tested.

CD communication test
Display : "DTST6"). The communication between the host
processor (DASP) and the CD loader is tested. The test is only
applicable for DR6050.

Loader tests
These tests determine if the CDR loader and the CD loader in
case of a DR6050 w ork correctly. A CD-DA disc with a
minimum of 3 tracks needs to be inserted in both loaders. A

disc test is executed to check focus control, disc motor control,
radial control and jump grooves control. The disc test is
performed by audio play-back of 5 seconds at the beginning,
middle and end of the disc.

CDR loader test
During the test, the current disc time is shown. In case of an
error the message "BERR1" will be displayed and the [F FWD]
key must be pressed to continue with the following test.
Pressing the [F FWD] key also aborts this test.

CD loader test
For DR6050 only. During the test, the current disc time is
shown. In case of an error the message "BERR2" will be
displayed and the [F FWD] key must be pressed to continue
with the following test. Pressing the [F FWD] key also aborts
this test.

Display test
All segments will blink at a frequency of 1 Hz. Pressing the [F
FWD] key will start the next test because the user has to check
for himself if all segments work properly.

Keyboard and remote control tests
The test will give the user the ability to test every key without
executing the function assigned to it. Therefore, the user needs
to press every key on the keyboard and the remote control. The
display will show the name of the key being pressed. Pressing
more than one key at once will give an unpredictable result
except for the service combinations : [PLAY/PAUSE] + [STOP],
[PLAY/PAUSE] + [F FWD], [F FWD] + [REWIND], [ERASE] +
[RECORD], [PLAY/PAUSE] + [RECORD].

6.4

Mechanical service diagnostics

Figure 6-3

6.4.1

Description

No external tools are required to perform this test. The cover
needs to be removed because the user has to check the
movements of the tray, focus and sledge visually. Pressing
keys [PLAY/PAUSE] and [STOP] simultaneously while
switching on the unit, starts the test. Switching off the unit ends
the test. In case of a DR6050, one can check the CD loader
mechanics in the same way by pressing the above key
combination on the CD player keys.

FOCUS TEST

Display shows

“BUSY”

Visual inspection

TRAY TEST

Visual inspection

Display shows

“OPENED”

even if tray is blocked

<

OPEN

>

<

CLOSE

>

SLEDGE TEST

Visual inspection

<FWD>

<REWIND>

MECHANICAL SERVICE DIAGNOSTICS

(test for defective components)

Press <PLAY/PAUSE> + <STOP>

simultaneously and switch

ON unit

If power ON,

switch power OFF

To end test, switch OFF unit

Display shows

“BUSY”

CL96532086_026.eps

080999

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