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25

TEST

Check the POWER PART

No

Yes

No

Yes

No

No

No

Yes

Yes

Yes

Check the POWER PART

Check the regulators or diode(D501).

Check the cable connection.
(PDV03)

1. Check 27MHz system clock.
2. Check systemreset circuit.
3. Check FLASH R/Wenable signal PRD,
    RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.

Check the

AC Voltage

Power PCBA (110V

or 220V)

Switch on the Power PCBA

Is

the DC Voltage

outputs OK?

(5V, 3.3V, 8V, 12V)

Is 3.3V and 2.5V DC

outputs normal on main

PCBA?

Update

FLASH(IC5A1)

successfully?

Replace FLASH( IC5A1)

A

Communication between
VCR & DVD is normally?

Connect to PC RS232 Cable and
update the FLASH memory code.

26

A

B

RESET or Power On.

Show LOGO?

Flash

Memory operates

properly?

Check connection lines between FLASH
& MT1379 and the FLASH access time
whether is sui table or not.

SDRAM

works properly?

MT1379

VIDEO outputs

properly?

Have

TV signal output?

Check AV cable
connection to TV set .

Check the load OPEN &
CLOSE switch

Check the Tray control IO pins
on MT1376 & MT1379.

Check the Tray control amplifying
circuit on Motor driver.(IC402)

Does

Tray move inside

when it is not at

closed position?

Normal

TROUT & TRIN

signals?

Normal

TRCLOSE &

TROPEN signal?

Normal

LOAD+ & LOAD-

signal ?

Check the cable connection between
main PCBA and loader. (MECHA)

Check connection lines between
SDRAM(IC502,IC503) & MT1379 and the
SDRAM is damaged.

Check the related circuit of MT1379.
(IC501 PIN 161,166, 168 check)

Check the filtering and amp circuit of
TV signal .(IC507)

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

27

B

No

Yes

OK

Yes

Yes

No

Yes

Yes

Yes

No

Yes

No

No

No

No

Does

the SLED move

to inner side when it is at

outer position?

Motor Driver STBY

Pin is High?

Motor Driver STBY

Pin is High?

SL+ and SL- output

properly?

Optical

Lens has movements

for searching

Focus?

Proper F+

& F- outputs?

Check cable connect of the
pick-up head.

Proper FOSO outputs

to motor driver?

Check FOSO connection on
MT1379 and motor driver.

Check the amp circuit on
motor driver.

C

Check the cable connection
with MECHA.

Do not put in disc and tray
close.

Check the connection line of
STBY signal .

Check the related circuit of
FMSO.

Check the amp circuit on
motor driver.

28

C

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

Laser turns on when

reading disc?

LD01 or LD02 output

properly?

Check the laser power circuit
on MT1336 and connecting to
power transistor. (Q404, Q405)

Check the related circuit on
laser power transi stor

Check the related circuit
on MT1336 RFL signal .

Collector

voltage of power

transistor is OK?

(Q404, Q405)

Check cable connection between
transistor output and pick-up head.

Proper RFL signal

on MT1336?

Proper

DMSO signal on

MT1379

Check DMSO related
circuit on MT1379.

Check the spindle control
amp circuit of motor driver.

SP+ & SP- output

properly?

Check the cable connection
between spindle and main PCBA.

Check the RFL connection
between MT1336 and MT1379.

Disc ID is correct?

Does spindle rotate?

D