NAD T-571-AH Schematic

NOTES) Warning

NOTES) Parts that are shaded are critical
NOTES) With respect to risk of fire or
NOTES) electricial shock.

470µF/2.3V

'01. 09. 21 R10581B

3-17 3-18

CIRCUIT DIAGRAM

1. POWER(SMPS) CIRCUIT DIAGRAM

NOTE :

1. Shaded( ) parts are critical for safety. Replace only
with specified part number.

2. Voltages are DC-measured with a digital voltmeter
during Play mode.

Oscillation abnormal

Digitron no Power

3.3V line dead.

No Power

8V line dead

5V_A/5V_D, No Power

No Power

3-19 3-20

5

56

Spindle Servo Loop

RF SIGNAL

Focus Servo Loop
Tracking Servo Loop

Sled Servo Loop

WAVEFORM

2. DVD DSP CIRCUIT DIAGRAM

DVD/CD picture

audio abnormal

MPEG Interface

Line

µ-com

Interface Data

µ-com

Interface adress

CD/DVD picture

audio abnormal

Tracking/Focus

Servo fail

Tracking

Servo fail

Spindle Motor

abnormal

CD/DVD picture

audio abnormal

Focus Servo

fail

Tracking

Servo fail

Scratched

Disc abnormal

Sled Servo fail

DRAM Control

Disc Detect

Error

Spindle Servo fail

3-21 3-22

3. DRIVE & RF CIRCUIT DIAGRAM

4

1

6

2

3

1

WAVEFORM

Spindle Servo Loop

Turn Table Loop

Focus Servo Loop
Tracking Servo Loop

Sled Servo Loop

Turntable

not operate

Tray Loading

Speed control

Turn table

speed control

Spindle Motor

unstable

Actuator spindle
sled not operate

DVD laser

not operate

CD laser

not operate

Servo fail

DVD Mode fail DVD

Laser not operate

Tracking Servo fail

Focus

Servo fail

µ-com

Interface line

CD/DVD picture

abnormal

4

4

3

7

5

2 6

WAVEFORM

OPTICAL/COAXITAL OUT

Y/Pb/Pr(Component)
Y.c(S-VHS)
Audio L/R OUT

CVBS

3-23 3-24

4. PANTERA CIRCUIT DIAGRAM

No Power on

Audiuo DAC Interface

System not operate

DSP interface line

Spindle Motor
unstable

System not working or
Digitron not display.