TAD-M30 - Sony Audio Service Manual (repair manual). Page 5

— 5 —

— 6 —

MAIN board

VOLUME board

PANEL board

SECONDARY board

AC board

PRIMARY board

SPEAKER board

SWITCH board

JACK board

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

%

: indicates tolerance.

•

2

: nonflammable resistor.

•

5

: fusible resistor.

•

C

: panel designation.

•

U

: B+ Line.

•

V

: B– Line.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal production
tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production
tolerances.

• Circled numbers refer to waveforms.
• Signal path.

L

: DIGITAL

a

: ANALOG

•

X

: parts extracted from the component side.

•

®

: Through hole.

•

b

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:
Pattern face side:

Parts on the pattern face side seen from

(Conductor B)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Component A)

the parts face are indicated.

The TAD-M30 has self-diagnosis mode and test mode.  The TAD-
M30 has three test modes: Factory shipment mode, Channel check
mode and FL display tube check mode.  The self-diagnosis detects
DSP errors and returns them automatically, and is performed as a
part of the channel check mode.  To exit the test mode, press the
POWER button again.

1. Factory Shipment Mode

When the factory shipment mode is set, the machine settings
return to the factory settings.  Set this mode before returning
the repaired machine to the customer.  To set this mode, first
remove the AC power cord.  Then, while pressing the  CURSOR
button and the left CURSOR button  ?  at the same time,
connect the AC power cord to the power outlet and press the
POWER   button.  The message “3ch SELF AMP” appears, the
machine is set to the factory shipment mode and the factory
settings are restored.

2. Channel Check Mode

When the factory shipment mode is set, the machine settings
return to the factory settings.  The DSP self-diagnosis is
performed as a part of this mode.  To perform this self-diagnosis,
first remove the AC power cord.  Then, while pressing the
CURSOR button and the right CURSOR button  /  at the
same time, connect the AC power cord to the power outlet and
press the   POWER   button.  The message “3ch SELF AMP”
appears then the self-diagnosis is performed.  If the DSPs are
normal, the message “DSP NO ERROR” appears.

3. FL Display Tube Check Mode

In this mode, the FL display tubes are checked.  To enter this
mode, first remove the AC power cord. Then, while pressing
the   DISPLAY   button and   BASS BOOST   at the same time,
connect the AC power cord and press the   POWER   button.
All the lamps and FL display tubes are turned on and the FL
display tube check is performed.  When any CURSOR button
is pressed, the FL display tubes are turned on one after another,
then all FL display tubes are turned on again.

The components identified by
mark 

!

 or dotted line with mark

!

 are critical for safety.

Replace only with part number
specified.