HCD-EC50DC, MHC-EC50DC - Sony Audio Service Manual (repair manual). Page 17

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The cold reset clears all data including preset data stored in the
memory to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:

1. In the standby status, press the  @/1  button to turn the power

on.

2. Press three buttons of [DSGX],  x , and at last   @/1  simulta-

neously.

3. When “RESET” appears, the machine enters standby status.

1. In the standby status, press the  @/1  button to turn the power

on.

2. Press three buttons of [DISPLAY], x , and [DSGX] simulta-

neously.

3. When the panel test mode is activated, LEDs and segments of

LCD are all turned on.

1. In the panel test mode (all LEDs and segments of LCD are

turned on), press the [FUNCTION] button.

2. On the LCD, date and version are displayed “xxxxxxxx”.

For example, “0317V004”.

3. From this status, press the [TUNER/BAND]  button, and the

destination is displayed. For example, “EC50DC”

4. To release from this mode, press three buttons of [DISPLAY],

x , and [DSGX] simultaneously.

Number of repeats for CD playback is 5 times when the repeat mode
is “REPEAT”. This mode enables CD to repeat playback for limitless
times.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Press three buttons of  CD u , [DSGX], and [DISPLAY] si-

multaneously.

4. It enters the CD repeat 5 limit cancel mode and displays “NO

LIMIT”

5. To release this mode, press the  @/1  button to turn the power

off.

This mode can run the CD sled motor optionally. Use this mode, for
instance, when cleaning the optical pick-up.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Press two buttons of  CD u  and  @/1  simultaneously. *1
4. Set to the CD ship mode. (chucking on)
5. After blink “STANDBY”, “LOCK” is displayed, disconnect

the AC plug.
*1) If press three buttons of [DISC 3],  x  and  @/1  simulta-

neously, activate the CD ship mode and MC cold reset.

This mode is for the antitheft of CD disc in shop. (not for transport)
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Insert a disc.
4. While pressing the  x  button, press the [DISC 1] button for

more 5 seconds.

5. The message “LOCKED” is displayed and the disc slot is

locked. (Even if exiting from this mode, the disc slot is still
locked)

6. If press the  Z  button to eject the disc, the message

“LOCKED” is displayed and can not eject the disc.

7. To release this lock, while pressing the  x  button, press the

[DISC 1] button for 5 seconds again.

8. The message “UNLOCKED” is displayed and the disc slot is

unlocked.

This mode is for switch the CD power supply on/off. Even if this
state pulls out AC plug, it is held.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. Press the  @/1  button again to turn the power off (standby).
4. After pressing the [DISPLAY] button, while pressing the  x

button, press the  @/1  button.

5. It turns power on and display “CD POWER”, then display

“ON” or “OFF”.

The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the [TUNER/BAND]  button to select TUNER (AM)

function.

3. Press the  @/1  button again to turn the power off (standby).
4. After pressing the [DISPLAY]  button, while pressing the

TUNING+ J  button, press the  @/1  button.

5. It turns power on and display “9k STEP” or “10k STEP”, and

thus the tuning interval is changed over.