HCD-GRX50, HCD-R770, HCD-RXD7, MHC-GRX50, MHC-R770, MHC-RXD7 - Sony Audio Service Manual (repair manual). Page 11

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• The cold reset clears all data including preset data stored in the

RAM to initial conditions. Execute this mode when returning
the set to the customer.

Procedure:
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of

p , 

[ENTER/NEXT]

, and

1/

u

 simulta-

neously.

3. The set is reset, and displays “COLD RESET”, then becomes

DEMO mode.

• This mode resets the set with the preset data kept stored in the

memory. The hot reset mode functions same as if the power
cord is plugged in and out.

Procedure:
1. Turn the power ON or set to the DEMO mode.
2. Press three buttons of

p , 

[ENTER/NEXT]

, and 

[DISC 1]

 si-

multaneously.

3. The set is reset, and becomes standby state.

• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the

1/

u

button to turn the power ON.

2. Select the function “TUNER”, and press the 

[TUNER/BAND]

button to select the BAND “AM”.

3. Press the

1/

u

button to turn the power OFF.

4. Press the 

[ENTER/NEXT]

 and

1/

u

buttons simultaneously,

and the display on the fluorescent indicator tube changes to
“AM 9 k STEP” or “AM 10 k STEP”, and thus the tuning
interval is changed over.

• This mode moves the optical pick-up to the position durable to

vibration. Use this mode when returning the set to the customer
after repair.

Procedure:
1. Press the

1/

u

button to turn the power ON.

2. Press the 

[LOOP]

 and

1/

u

buttons simultaneously.

3. A message “LOCK” is displayed on the fluorescent indicator

tube, and the CD delivery mode is set.

Procedure:
1. Press three buttons of

p , 

[ENTER/NEXT]

, and 

[DISC 2]

 si-

multaneously.

2. LEDs and fluorescent indicator tube are all turned on.

Press the 

[DISC 2]

 button, and the key check mode is acti-

vated.

3. In the key check mode, the fluorescent indicator tube displays

“K 0 J0 V0”. Each time a button is pressed, “K” value in-
creases. However, once a button is pressed, it is no longer taken
into account.
“J” value increases like 1, 2, 3 ... if turn the JOG dial clock-
wise, or it decreases like 0, 9, 8 ... if turn the JOG dial counter-
clockwise.
“V” value increases like 1, 2, 3 ... if turn the 

[VOLUME]

 dial

clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial
counterclockwise.

4. To exit from this mode, press three buttons in the same man-

ner as step 1, or disconnect the power cord.

• 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/

u

button to turn the power ON.

2. Select the function “CD”.
3. Press three buttons of

p , 

[ENTER/NEXT]

, and

§  simulta-

neously.

4. Set to the Sled Servo mode.
5. With the CD in stop status, turn the JOG dial clockwise to

move the optical pick-up to outside track, or turn it counter-
clockwise to inside track.

6. To exit from this mode, perform as follows.

1) Move the optical pick-up to the most inside track.
2) Disconnect the power cord.

• Always move the optical pick-up to most inside track when

exiting from this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can

be chipped.