Nad T 533 Service Manual

Page 12

2. System operation flow

Power On

1. 8032 initializes SERVO, DSP & RISC registers
2 Write RISC code to SDRAM

3. Reset RISC

Show LOGO

l

Tray Closed?

Tray Close to Closed position

SLED at lnner
Side?

SLED Moves to Inner Position

V

(-

1t Judge whether have disc and disct pe
2 Jump to related disc reading proce ure

No

1t Execute Pressed Key & IR Key
2. Systemoperati on Routi ne Loop

1. Stop Playback & Open Tray
2. Display tray open message & LOGO

-)

Receive Yes

CLOSE Key?

Page 16

s on when

Put disc in?

Yes

Disc ID is correct?

Yes

Does spindle rotate?

No
001 or LD02 output

properly?

voltage of power
transustor is OK?

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

No

-> Laser off

Proper RFL si nal
on MT1336.

Check the RFL connection
between MT1336 and MT1379.

Pro er
DMSO signal on No

MT1379

No

SP+ & SP- output
properly?

Check the cable connection
between spindle and main PCBA.

Check the laser power circuit
on MT1336 and connecting to
power transistor. (0204, 0205)

Check therel ated ci rcuit on
laser power transi stor

Check the related circuit
on MT1336 RFL signal .

Check DMSO related
circuit on MT1379.

Check the spindle control
amp circuit of motor driver.

Page 56

MEMO MEMO