SPHINX Myth3 Service Manual

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SERVICE MANUAL

MYTH 3

INTEGRATED

STEREO AMPLIFIER

SPHINX Myth 3 Service Manual

1. UNPACKING.......................................................................................................................................3

2. CONTACTING THE MANUFACTURER.............................................................................................3

3. THE AMP AT A GLANCE...................................................................................................................4

Front panel................................................................................................................................................... 4

Rear panel ...................................................................................................................................................5

4. OPERATION .......................................................................................................................................6

Power on...................................................................................................................................................... 6

Selecting an input ........................................................................................................................................6

Tape button.................................................................................................................................................. 6

Adjusting the volume....................................................................................................................................6

Standby button............................................................................................................................................. 6

Power off...................................................................................................................................................... 6

Amplifier switches to Protection Mode... ...................................................................................................... 6

5. SPHINX REMOTE CONTROL............................................................................................................7

Buttons.........................................................................................................................................................7

Operation.....................................................................................................................................................8

Selecting without switching..........................................................................................................................8

Batteries.......................................................................................................................................................8

Encountering problems................................................................................................................................8

6. TECHNICAL SPECIFICATIONS.........................................................................................................9

7. ADJUSTMENT PROCEDURES........................................................................................................10

Bias............................................................................................................................................................10

Offset ......................................................................................................................................................... 10

8. PROBLEMS AND SOLUTIONS .......................................................................................................11

9. DIAGRAMS AND PARTS LISTS ......................................................................................................12

Measurement Set-up .................................................................................................................................13

General Overview Myth 3...........................................................................................................................14

Schematic Diagram Power Supply.............................................................................................................15

Schematic Diagram Input / Output.............................................................................................................16

Schematic Diagram Amplifier Left .............................................................................................................. 17

Schematic Diagram Amplifier Left .............................................................................................................. 18

Schematic Diagram keyboard....................................................................................................................19

Schematic Diagram control........................................................................................................................20

Parts List....................................................................................................................................................21

SPHINX Myth 3 Service Manual

The Sphinx Myth 3 design

This service manual will help you to optimally service and repair the Sphinx Myth 3 Integrated Stereo Amplifier

This integrated high-end stereo amplifier is of discrete design throughout (no IC's are used). The Myth 3 uses a passive pre-amp. The power amp uses specially selected power FETs with a power bandwidth of over 20 MHz, a very fast slew rate and an unsurpassed phase linearity over the power bandwidth. Each channel uses two 120W/10A FETs and operates as a pure ‘current source’ with a very low impedance. The amplifiers are therefore very stable and can effortlessly drive every type and format of loudspeaker at maximum quality (even the most complex ones, such as electrostatic and magnetostatic...). The amp outputs are sent to the loudspeaker connectors via heavy duty, completely gold-plated relays.

To obtain the maximum quality from this integrated amp it is necessary to use it with top quality audio components, preferably with other Sphinx components.

1. UNPACKING

Before leaving the factory every Myth 3 is subjected to stringent and extensive technical and exterior quality inspection. This ensures you will enjoy many years of high quality audio from a perfect-looking product.

After unpacking your Myth 3 we therefore recommend you carefully check it for any transport damage. In case of damage: please contact your Sphinx dealer immediately and retain all packing materials for possible proof of damage and possible claims.

Even if the component is in perfect condition you should still keep the packing materials. If you need to transport your Myth 3 at a later time it will be best protected by the original packing materials.

2. CONTACTING THE MANUFACTURER

In case of any problem not covered in this manual or if you have other questions you may contact the Sphinx International Service Department in The Netherlands (local time: GMT +1h) during office hours at the following numbers:

Phone: (+31) 35 602 0302 Fax: (+31) 35 602 2806 E-mail: audionl@euronet.nl

It is always very helpful and efficient if you have all relevant information about the specific product and the problem ready.

Please also refer to the User Manual of the Myth 3 for information about functions not described in this manual. It is important to familiarise yourself with the special functions, operation and possibilities of the Sphinx Myth 3.

SPHINX Myth 3 Service Manual

3. THE AMP AT A GLANCE

Front panel

1. PHONES: To connect dynamic stereo headphones.

2. CD: To select the CD input.

3. TUNER: To select the TUNER input.

4. LINE 1: To select the LINE 1 input.

5. LINE 2: To select the LINE 2 input.

6. TAPE: To select the TAPE IN input. As soon as you have pressed one of the buttons

2. to 6. the corresponding red LED next to it will light.

7. STANDBY: To switch the component on and off. When the component is 'off' (standby) this is indicated by the red LED.

8. Sensor window for the IR signal from the Remote Control.

9. VOLUME: With this motor-controlled knob you may adjust the volume of the loudspeakers. The volume can be controlled manually or via the Remote Control.

SPHINX Myth 3 Service Manual

Rear panel

10. LINE 2: To connect the cinch signal cable from the signal source for LINE 2.

11. LINE 1: To connect the cinch signal cable from the signal source for LINE 1.

12. TUNER: To connect the cinch signal cable from the tuner.

13. CD: To connect the cinch signal cable from the CD player.

14. TAPE OUT: Connect this output to the Input of the recorder.

15. TAPE IN: Connect this input to the output of the recorder.

16. RIGHT OUTPUT: To connect the cable from the right loudspeaker: red + black -

17. LEFT OUTPUT: To connect the cable from the left loudspeaker: red + black -

18. Manufacturer’s label: This shows important data for the component, such as serial number and mains power voltage.

19. AC Power: Connect the mains cable to a mains power outlet (100 - 240 VAC).

20. Fuse holder: Contains a 3.15 A slow type fuse.

21. ON/OFF: This is the mains power switch.

13 14 15 16 17

19 21

SPHINX Myth 3 Service Manual

4. OPERATION

Once you have finished connecting all components, you can switch on the Myth 3.

Connect the mains cable to a mains outlet. Turn the volume control to 'off' (fully counterclockwise).

Power on

Switch the Myth 3 on with the ON/OFF switch (21) on the rear panel. The red LED next to the STANDBY button will blink. After a few seconds the CD input is selected: the red LED next to CD (2) will light.

The Myth 3 is now switched on and ready for use. You can leave the amp on. That way all circuits will

remain at optimum operating temperature and the audio quality will be 100% immediately after switching on. Additionally it significantly increases the life span of the component. Only if the amp will not be used for a longer period you might switch it off with the ON/OFF switch (21) to save energy.

Selecting an input

Select the input with one of the buttons 2. to 6. As soon as you have selected an input, the red LED next to the button will light.

CD : To select the CD input. TUNER : To select the TUNER input. LINE 1 : To select the LINE 1 input. LINE 2 : To select the LINE 2 input.

Tape button

Pressing the TAPE button in the front panel (6) selects the TAPE IN input. After you press PLAY on the recorder you will hear the recorded signal.

If you record a tape this button lets you compare the input signal (as selected with button 2., 3., 4. or 5) to the signal from the recorder: IN (LED red) signal from tape OUT (LED off) signal from selected input

When using a 3-head recorder you can therefore compare the original signal with the actual recorded signal (you'll hear the 'off-tape' signal which might be slightly delayed).

Adjusting the volume

Using the large VOLUME control (9) you can adjust the sound level from the loudspeakers. This volume control is motor-controlled. If you adjust the volume on the Remote Control the knob will turn automatically. The position of the knob always correctly indicates the set volume.

Standby button

The STANDBY button (7) temporarily mutes the sound from the loudspeakers: the red LED will light. Another press on the button un-mutes the sound, the LED extinguishes. You may also use this button when you listen on headphones and would like to switch the loudspeakers off. The Mute function has no influence on the signal to the headphones. This function can also be controlled using the Remote Control.

Power off

Switch the Myth 3 temporarily off (to stand-by) with the STANDBY button (7). When the Myth 3 will not be used for a longer period, you may switch it off completely with the ON/OFF switch (21).

Amplifier switches to Protection Mode...

Indication: the Standby LED blinks rapidly and the volume control turns automatically to “zero” (fully counter clockwise).

Note: Switch power off with the ON/OFF switch (21) and wait for at least 60 seconds. In the mean time, check all loudspeaker cables for shorted wires! If you find any, remove the short-circuit to insure fault-free connection.

Now switch the power on with the ON/OFF switch. If the amplifier itself is not defective, it will operate normally again after 30 seconds.

SPHINX Myth 3 Service Manual

5. SPHINX REMOTE CONTROL

This single Sphinx Remote Control allows you to control all functions: not only of the Myth 3, but of all other Sphinx equipment.

Only the following buttons and indications on the Remote apply to the Myth 3 (the others will not function):

Buttons

1. PRE-AMP: To select the amp. All buttons pressed hereafter will control only the amp functions.

2. STANDBY: Use this red button to switch the loudspeaker outputs of the Myth 3 off (standby).

3. 1 - 4: To select inputs CD to Line 2 (Note: 5 to 0 do not function): 1 CD 2 Tuner 3 Line 1 4 Line 2

4. TAPE/MONITOR: Use this button to select the Tape IN input.

5. + button: Pressing this button has the same effect as rotating the VOLUME control on the front panel clockwise. You increase the volume.

6. — button: Pressing this button has the same effect as rotating the VOLUME control on the front panel anti-clockwise. You decrease the volume.

SPHINX Myth 3 Service Manual

Operation

The Sphinx Remote is used with several different models and can therefore transmit different control codes, depending on which model has been selected with the select buttons (1).

Important: Always press the PRE-AMP button before you send a command (even if you only have one Sphinx component).

Otherwise it is possible that, although the Remote will send a signal, nothing happens because the transmitted signal is not 'recognised' by the component. Indoors the Remote may be used up to a distance of 7 meter, provided there is no strong sunlight in the room and if you aim the Remote at the component. Always aim the Remote straight at the front panel of the component, the maximum offset angle is 30°.

Selecting without switching

Suppose, for instance, that you would like to select the Tuner to Radio 4 without interrupting CD playback. In that case you momentarily depress (not longer than 0.5 sec) the 'TUNER' button and the '4' button. The same procedure is used for the other system components.

How to operate the Remote Control with the different Sphinx components will be explained in the corresponding User Manual of each component.

Batteries

The four batteries have a life span of approximately one year during normal use, but shorter when used more intensely. Replacement batteries: 1.5 V, model micro or penlite or LR03 or AAA or AM4 (one of these codes is indicated on the packaging and the batteries). You may also use rechargeable 1.5 V batteries.

Note: Position the new batteries exactly as shown in the illustration at the bottom of the battery compartment, otherwise the Remote will not function!

Encountering problems...

Remote Control does not work

Wrong component selected Select the correct one Distance to component

exceeds 7 m

Use Remote at closer range

Angle between Remote and component exceeds ±30°

Decrease angle

Sensor window on front dirty Clean window Batteries empty or incorrectly

placed

Use new batteries or replace the old ones

correctly Strong (sun)light in room Shade off light source Component is not switched on

(!)

Switch it on

Component reacts differently than expected or not at all

Wrong component selected Select the correct one Component or Remote does

not function

Check component with

its original remote Batteries in Remote empty Use new batteries

SPHINX Myth 3 Service Manual

6. TECHNICAL SPECIFICATIONS

Bandwidth 10 - 103,000 Hz (+0/-3 dB) Phase response error <2° (from 0 - 20,000 Hz) Gain 33 dB max. (44.7 times) Minimum Power Output (1 - 20.000 Hz)

>2x 50 W into 8 Ω (17.0 dBW), THD <0.01% >2x 68 W into 4 Ω (18.3 dBW), THD <0.02%

>2x 66 W into 2 Ω (18.2 dBW), THD <0.01%3 Output voltage / current, max. 20 V / 10 A THD+N (IHF-A) <0.006% (2nd harm., 10-20,000 Hz) IMD <0.030% S/N ratio (IHF-A) >100 dB Channel separation >70 dB (1 - 20,000 Hz) Slew rate >24 V/µs Damping factor >525 (1 - 1,000 Hz)

Inputs cinch, unbalanced 1x Line 2, 1x Line 1, 1x CD, 1x Tuner, 1x Tape level, nominal 1.25 V impedance

20 kΩ Outputs

cinch 1x Tape headphones 1x 6.3 mm stereo jack, adjustable level clamp 1x loudspeaker L, 1x loudspeaker R

Supply capacitance 18,800 µF total Power consumption 550 W max. (57.5 W standby) Dimensions (h x w x d) 110 x 434 x 330 mm Weight 7 kg

This unit conforms to the EMC interference regulations issued by the EU and to the CE standards. This unit complies with safety regulation VDE 0860 and therefore with international safety regulation IEC 65.

Technical specifications may be changed by SPHINX without prior notice if technical developments make this necessary.

SPHINX Myth 3 Service Manual

7. ADJUSTMENT PROCEDURES

The Myth 3 is an integrated amplifier, meaning the pre-amp and power amp sections are combined into one cabinet. The Myth 3 only has two parameters for each channel (so four in total) that might need adjustment:

- Bias: to set the bias current and bias voltage of the amplifier for normal use.

- Offset: to set the DC-offset voltage of the output.

These adjustments might be necessary when the amplifier has been used for a period of time (and settings have changed due to ageing) or when a part of the Myth 3 have been replaced.

Attention:

When re-adjusting any setting please ensure that there is no loudspeaker connected to the output! Otherwise the loudspeaker may be seriously damaged.

Attention:

The amplifier is able to generate high output voltages of over + or -40 V. Please be very careful during the adjustments!

Bias

With this procedure you set the proper bias level for the power FETs. This ensures their Class A operation at low power levels. Connect the amplifier according to the drawing “Measurement Set-up” (page 13). The input of the amplifier must be shorted (by way of the MUTE function of the oscillator).

• Switch the amplifier ON and wait until it has

reached the proper working temperature

• Set the millivolt-meter to the DC-range.

• Place the two measuring clips of the meter

across one of the source resistors Left: R30L, R31L Right: R30R, R31R (refer to schematic on page 17/18).

• The level for each should be 8 mV DC (±2 mV).

If not: adjust potmeter P2L (Left) or potmeter P2R (Right) until the level is 8 mV.

• Repeat this procedure after 20 minutes to

finalise the adjustment.

• Switch the oscillator on and set it to 1 kHz and a

level of 0 dBV (1 V).

• Check the distortion with a THD analyser: it

should be conform to the specified value (0.01% IHF-A @ 1 – 20 kHz @ 50 W into 8 ohm). If this is correct the procedure is finished.

• You may now switch off the amplifier or continue

with another adjustment procedure.

Offset

The Offset adjustment procedure minimises the DC offset value of the amplifier output. This DC offset is important when capacitive loads are used, such as electrostatic loudspeakers. These loudspeakers often use a very low-impedance step-up transformer. The amplifier ‘sees’ this load as a short for the DC voltage. Connect the amplifier according to the drawing “Measurement Set-up” (page 13). The input of the amplifier must be shorted (by way of the MUTE function of the oscillator).

• Switch the amplifier ON and wait until it has reached the proper working temperature.

• Set the millivolt-meter to the DC-range.

• Place the measurement clips of the meter over

the output terminal.

• The level should not exceed +1 or -1 mV DC. If it does: adjust potmeter P1L (Left) or P1R (Right) until the level is within this range.

• Repeat this procedure after 20 minutes to finalise the adjustment.

• Switch the oscillator on and set it to 1 kHz and a level of 0 dBV (1 V).

• Check the distortion with a THD analyser: it should be conform to the specified value (0.01% IHF-A @ 1 – 20 kHz @ 50 W into 8 ohm). If this is correct the procedure is finished.

• You may now switch off the amplifier or continue with another adjustment procedure.

SPHINX Myth 3 Service Manual

8. PROBLEMS AND SOLUTIONS

At the moment of writing the Myth 3 has no known specific problems. If in the future you encounter any problem(s) you may enter the info in this table. This table can then be used for future reference.

Please also send (by fax or e-mail) the specific information to the Sphinx International Service Department (see page 3): this info can then be added to the general database to aid others.

Problem Cause Solution Refer to

page…

Bandwidth ≈ 100 kHz

Value of C2L, C2R too large (220 pF)

Change C2L, C2R value to 47pF17/18

SPHINX Myth 3 Service Manual

9. DIAGRAMS AND PARTS LISTS

The next pages contain the front and rear panel layout and a complete set of schematic drawings including the associated parts lists (if applicable).

SPHINX Myth 3 Service Manual

Measurement Set-up

GND

Left

Right

MYTH 3

out1 out2

inp2

inp1

gnd

THD

Amplitude

Frequency

Oscillator

THD out

(+) (-) (+) (-)

inp2

time/div

inp1

gnd

out1 out2

inp2inp1

Scoop

SWITCH-BOX

mVmV

GND

SPHINX Myth 3 Service Manual

General Overview Myth 3

Myth 3 power supply M3-ps.sch

Myth 3 keyboard m3-keyb.sch

Myth 3 control m3-ctrl.sch

SPHINX Myth 3 Service Manual

Schematic Diagram Power Supply

ACINP2

EARTH

ACINP1

SW1A 115_230

SW1B 115_230

NTC1

2.5E/8A

220N

D3 SB356

ACS1

ACS4

ACS2 ACS3

4700U/50V

GND

-V

Q1 BD679

ZF24V

R2 10K

R1 56R/2W

1N4148

C10

10U

+24V

+24VOUT

GNDOUT

SPHINX Myth 3 Service Manual

Schematic Diagram Input / Output

R53 4k75

R42R 475R

R41R 475R

R41L 475R

R52 4k75

R42L 475R

R51 10k

L2/L1A L2/L1B TUNER/CDA TUER/CDB TAPEA TAPEB

REL1 REL16

REL2 REL16

REL3 REL16

REL4 REL16

REL5 REL16

LINE2 LINE1 TUNER CD TAPE OUT TAPE IN

1N4148

D10

1N4148

D11

1N4148

D12

1N4148

+24V

C21R

10U/100V

C21L

10U/100V

C20R

120P

C20L

120P

AGND AGND

Q17 C2240

D17

1N4148

IC1R CNY17-D

IC1L CNY17-D

REL6RLA RA451024

+24V

AGND

9 10 7 8 643

PM3PM4 PM1PM2

P1.2

ALPS 20K

P1.1

ALPS 20K

R2 475R

R1 475R

L_O

R_O

R-I

L_ILGI

RGI

LGO

RGO

R11KR2

R3 1K

R6 1K

R5 1K

R4 1K

ORANJE RIGHT

GROEN LEFT

RIGHT PHONES

GND PHONES

LEFT PHONES

GEEL GND

SPHINX Myth 3 Service Manual

Schematic Diagram Amplifier Left

Q1L K389

Q2L C1775 Q3L

C1775

R7L 820R

R8L 820R

R9L 22R

R10L 22R

R11L 1K00

R13L 22K

R12L 475R

R2L 22K0

R1L 475R

R5L 22K

R6L 120K

AGND

P1L

200R

Q4L C1775

AGND

C1AL

120P

C1BL

120P

C2L

220P

C3L

C12L

100N

C14L

100N

C9L

100N

C6L

100N

C15L

100N

C17L

100N

C11L

220U/63V

C13L

220U/63V

C10L

100U/16V

C18L

10U/100V

C16L

10U/100V

C5L

10P

C4L

100N

D1L

LED

Q5L A970

Q6L A970

R15L 39R

R17L 39R

R16L 56R0

R14L 18K0

R4L 22K

R3L 475R

R19L 220R

R24L 1KR18L

3K3

R26L 22R

R20L 300R

R21L 300R

R25L 22R

Q8L C2240

Q7L C2240

P2L 500R

AGND

Q9L C2240

P3L

50k

R41L 50k

Q11L A1145

Q10L C2705

Q12L C4382

Q13L A1668

D3L

ZF10

D2L

ZF10

D4L

ZF10

D5L

ZF10

R27L 47R/2W

R28L 100R

R29L 100R

R30L 0R22

R31L 0R22 R32L

47R/2W

R34L 10R/5W

R33L 10R/5W

R22L 2R2

R23L 2R2

Q15L A1668

Q14L K1058

D6L

1N4007

D7L

1N4007

C7L

47N

AGND

IC1L CNY17-D

REL6LB RELAIS DPDT

REL6LC RELAIS DPDT

L1L EE-K-021

C8L

330N

C21L

10N

C20L

V+ V+_BEV

V-

OUT+

OUT-

PM7

PM8

GNDOUT

KAST

R35L 220R

R36L 100R

C19L

100N

Q16L C1775

D2L

1N4148

SPHINX Myth 3 Service Manual

Schematic Diagram Amplifier Right

Q1R K389

Q2R C1775 Q3R

C1775

R7R 820R

R8R 820R

R9R 22R

R10R 22R

R11R 1K00

R13R 22K

R12R 475R

R2R 22K0

R1R 475R

R5R 22K

R6R 120K

AGND

P1R

200R

Q4R C1775

AGND

C1AR

120P

C1BR

120P

C2R

220P

C3R

C12R

100N

C14R

100N

C9R

100N

C6R

100N

C15R

100N

C17R

100N

C11R

C13R

220U/63V

C10R

100U/16V

C18R

10U/100V

C16R

C5R

10P

C4R

100N

D1R

LED

Q5R A970

Q6R A970

R15R 39R

R17R 39R

R16R 56R0

R14R 18K0

R4R 22K

R3R 475R

R19R 220R

R24R 1KR18R

3K3

R26R 22R

R20R 300R

R21R 300R

R25R 22R

Q8R C2240

Q7R C2240

P2R 500R

AGND

Q9R C2240

P3R

50k

R41R 50k

Q11R A1145

Q10R C2705

Q12R C4382

Q13R A1668

D3R

ZF10

D2R

ZF10

D4R

ZF10

D5R

ZF10

R27R 47R/2W

R28R 100R

R29R 100R

R30R 0R22

R31R 0R22 R32R

47R/2W

R34R 10R/5W

R33R 10R/5W

R22R

2R2

R23R 2R2

Q15R A1668

Q14R K1058

D6R

1N4007

D7R

1N4007

C7R

47N

AGND

IC1R CNY17-D

REL6RB RELAIS DPDT

REL6RC RELAIS DPDT

L1R EE-K-021

C8R

330N

C21R

10N

C20R

V+ V+_BEV

V-

R35R 220R

R36R 100R

C19R

100N

Q16R C1775

D2R

1N4148

SPHINX Myth 3 Service Manual

Schematic Diagram keyboard

S1A S1B S2A S2B S3A S3B S4A S4B S5A S5B S6A S6B

R1 3K3

R2 3K3

LED

LEDD4LED

LED

R3 3K3

TAPE-M

LINE1

LINE2 CD TUNER

MUTE

+24V

L+24V

L-TAPE L-L2

L-TUNER

L-MUTE

L-CD L-L1

S-L2 S-CD S-TUNER S-TAPES-MUTES-L1

SPHINX Myth 3 Service Manual

Schematic Diagram control

100ND21N4148D11N4148

R5 4K7

R8 4K7

R6 4K7

R7 4K7

R3 10K

R13 10K

R4 10KQ11

BC807

BC817Q9BC817

C10

330U/6V

Q8 BC817

Q10 BC807

100N

C13

10U/100V

100N

VoutVin

GND

U1 7805

100N

Q2 A970Q3A970

Q4 C2240Q5C2240

M1 M2

100N

Q1 8MHz

R16 4K7

R17 4K7

R18 33K

R14 10K

R11 390R

R12 390R

V+

GND

IR1

SFH506-38

1U5

C27

68U/6V3

C14

100N

OVER_CR

OVER_CL

DGND

+5V

VCC

/MR

GND PFI /PFO

WDI

/RES

/WDO

IC1

ADM705

R12 4K7

R11 4K7

Q13 BC807

+5V

DGND

PROTECT

DGND

P17-T020P37

P36

P35

P34

P14

P15-INT0

P33

P11

P32

P31

P30

P16-INT1

VCC

P13

P12

P10

GND

P02

P01-SDA

P00-SCL

RES

MCT1 83751

IN1

IN2

IN3

IN6

IN55O5

IN7

GND

IN4

IN88O8

ULN2803

4K7

RN1A 4K7

C36

22U/16V

DGND

R2 4K7

BC807

R1 4K7

DGND

FL-TAPE

FL-L1

FL-L2

FL-TUNER FL-CD MUTE_LED FL-REL

123456789

DGND

FL-ERROR

+24VS

C23

100N

C19

100N

C24

100N

C26

100N

C20

100N

C21

100N

C22

100N

C25

100N

4K7

RN1A 4K7

+5V

C33

100N

C32

100N

C31

100N

C30

100N

C29

100N

C28

100N

DGND

100N

+5V

PROTECT

100N

+5V

DGND

24V

5V6D51N4148

R15 4K7

Q12 BC817

C34

1U/35V

+24VS

+24V

DGND

Q14

BCV46

+24V

DGND

FL-ERROR

+40V

100N

C11

100N

C12

100N

C14

100N

C15

100N

C16

100N

DGND

KAST +5V

S-GND

S-TAPE

S-L2

S-CD

S-TUNER

S-L1

S-MUTE

L+24V

L-MUTE

L-CD

L-TUNER

L-L1

L-L2

L-TAPE