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– 5 –

Plug the AC power cord into a convenient AC

outlet, after any connections.

Unplug the AC power cord from the AC outlet

if the unit will not be in use for a prolonged
period of time.

Never use a power cord other than the one

supplied. Use of a power cord other than the
one supplied may cause an electric shock or
fire.

Be sure that the power is turned OFF when
connecting the speaker cord. Failure to turn
the power off can result in a short circuit that
will place the amplifier into the protection cir-
cuit mode and cause the amplifier to shut
down. If this occurs, make sure that the am-
plifier is off, then disconnect the power cord
from the outlet to reset the circuit breaker. You
can then reconnect the cord to use the am-
plifier.

Make sure to set the volume to the minimum
sound level before turning on the amplifier
power or performing any input switching. Fail-
ure to do this may result in damage to your
speaker system.

The supply voltage of the switching circuit is
not linked with volume adjustment.
Therefore, a constant voltage is supplied even
if not playing back sound and residual sound
may be generated slightly such as when the
volume is turned up. This is normal.

If this product is subjected to strong external
interference (excessive shock, static electric-
ity, abnormal supply voltage due to lightning,
etc.) or if it is operated incorrectly, it may mal-
function.
In such a case, turn the power off.
Turn the power on again and check that the
product works normally.
(If problems still occur, contact the dealer.)

Protectors are applied to all five feet.
Remove them before installation.

It is recommended to attach the three supplied
pads as shown below. This unit is supported at
three points.
The pads prevent slippage or damaging the rack.

Protector

Middle foot at the back

To AC  INPUT

To an AC outlet

Pad

Power supply voltage:
The voltage used by this product varies, depend-
ing on the shipping destination. Check if the volt-
age written on the left side panel of the unit is
suitable for that of your country.

– 6 –

Caution on Disassembly
Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Be sure to remove the power supply plug from the wall

outlet before starting to disassemble the unit.

2. Take off nylon bands or wire holders where they need to

be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were
before disassembling.

3. Take sufficient care on static electricity of integrated

circuits and other circuits when servicing.

1

Top Panel

1. Hexagon Screw ...... (A1) x5

6-1

2

Side Panel

1. Hexagon Screw ...... (B1) x6

6-2

(Left/Right)

3

Front Panel

1. Screw .................... (C1) x4

6-2

2. Socket ................... (C2) x1

4

Rear Panel

1. Screw .................. (D1) x16

6-2

2. Socket ................... (D2) x2

5

Side Bracket

1. Screw ................... (E1) x14

6-3

(Left/Right)

2. Socket .................... (E2) x3

6

Front Bracket

1. Screw ..................... (F1) x1

7-1

2. Nut .......................... (F2) x1
3. Screw ..................... (F3) x8
4. Socket .................... (F4) x1

7

Shield Cover A

1. Screw .................... (G1) x4

7-2

8

Shield Cover B

1. Screw .................... (H1) x4

7-2

9

Microcomputer

1. Socket .................... (J1) x2

7-3

PWB

2. PWB Holder ........... (J2) x4

10

Main PWB

1. Screw ..................... (K1) x5

7-3

2. Socket .................... (K2) x5

11

Power PWB

1. Screw ..................... (L1) x8

7-4

2. Screw ..................... (L2) x2
3. Socket .................... (L3) x2

12

AC Input Filter

1. Screw .................... (M1) x1

7-4

PWB

2. PWB Holder .......... (M2) x3

13

Input Source PWB 1. Screw .................... (N1) x1

7-4

14

1 Bit Amp. PWB

1. PWB Holder ........... (P1) x4

7-4

15

Selector Switch

1. Screw .................... (Q1) x5

7-5

PWB

2. Socket ................... (Q2) x1
3. Claw ...................... (Q3) x2

16

Segment PWB

1. Screw ...................... (R1) x4

7-5

2. Claw ...................... (R2) x4

(A1)x5
ø4x6mm

(B1)x3
ø3x8mm

(B1)x3
ø3x8mm

Top Panel

Front Panel

Side Panel
Right(Right)

Side Panel
(Left)

Rear Panel

(D1)x13
ø3x6mm

(D1)x2
ø3x6mm

(D1)x1
ø3 x6mm

(C1)x2
ø3x8mm

(C1)x2
ø3x8mm

(C2)x1

(D2)x1

Front
Panel

Rear Panel

Shield
      Plate

Power Filter
PWB

(D2)x1

Speaker
Relay PWB

Microcomputer
PWB

(E1)x5
ø3x6mm

(E1)x2
ø3x6mm

(E1)x2
ø3x6mm

(E1)x5
ø3x6mm

Side Bracket
(Left)

Side Bracket
(Right)

(E2)x3

Input Source
PWB

Microcomputer
PWB

– 7 –

(G1)x4
ø3x6mm

(H1)x4
ø3x6mm

Shield
Cover A

Shield
Cover B

Main PWB

Front Panel

Selector
Switch PWB

Segment PWB

Washer

(Q1)x5
ø2x25mm

(R1)x4
ø2x12mm

(Q2)x1

(Q3)x2

(R2)x4

Selector
Switch PWB

Segment
PWB

Pull

Pull

Pull

(J2)x4

(J1)x2

(K1)x5
ø3 x6mm

(K2)x3

(K2)x2

Microcomputer
PWB

Main PWB

Push

Push

Microcomputer
PWB

Pull

1

2

(F3)x4
ø3x6mm

(F3)x2
ø3x6mm

(F4)x1

(F3)x2
ø3x6mm

Front
Bracket

Power PWB

Volume
Bracket

Volume
Knob

Washer

Washer

Power Knob

(F1)x1
ø3x8mm

(F2)x1

AC Inputr
Filter PWB

UNT501, 502

Input Source
PWB

1 Bit Amp PWB

(L1)x8
ø3x8mm

(L2)x2 
ø3x6mm

(M1)x1
ø3x6mm

(N1)x1
ø3 x6mm

(L3)x2

(M2)x3

(P1)x4

AC Input
Filter PWB

1

2

1 Bit Amp
PWB

1

2

Push

Pull

Push

Pull

– 8 –

Measure the noise distribution between the set output terminals (Lch+, Lch- and Rch+, Rch-), and adjust VRA1 to VRA4. The VRA
adjustment sequence is the same as that of the offset voltage adjustment.

Measuring instrument: Yokokawa Electric brand SA2400
Measurement range : Refer to Fig. 8-2.
Adjustable range: 

1

 250Hz to 100kHz within 

±

3dB from the standard noise curve

2

 (Noise strength of 125Hz) — (Noise strength of 250Hz)      20dB

AC POWER
SUPPLY

UNIT

Specterum 
Analyzer

Speaker terminal
Apply the analyzer between Lch+ and Lch-,
and between Rch+ and Rch-.

Standard noise floor curve
(Frequency range 1)

20dBV ¨ ”