HCD-GN999D, MHC-GN999D, MHC-GN999DS - Sony Audio Service Manual (repair manual). Page 17

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[PANEL TEST  MODE]
• This mode is used to check the fluorescent indicator tube, LEDs,

keys, VOLUME jog, model, destination, software version and
VACS level.

Procedure:
1. Press 

x

 button, [ILLUMINATION] button and [DISC 2] button

simultaneously.

2. All LEDs and segments in fluorescent indicator tube are lighted

up.

3. When you want to enter to the software version dispaly mode,

press [DISC 1] button. The model information appears on the
fluorescent indicator tube. Press [DISC 1] button again to view
the destination information.

4. Each time [DISC 1] button is pressed, the display changes from

MC version, SYS version, UI version, DVD version, CDMA
version, CDMB version, ST version, TA version, TM version,
TC version in this order, and returns to the model version display.

5. When [DISC 3] button is pressed while the version numbers are

being displayed except model and destination, the date of the
software creation appears. When [DISC 3] button is pressed
again, the display returns to the software version display. When
[DISC 1] button is pressed while the date of the software creation
is being displayed, the date of the software creation is displayed
in the same order of software version display.

6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays

“K 0 V0”.
Turn the [OPERATION DIAL] clockwise; “K” value increases by
one. Turn the [OPERATION DIAL] counterclockwise; “K” value
decreases by one. Each time a button is pressed, “K” value
increases. Press other keys on main unit to check whether the
key is detected. However, once a button has been pressed, it is
no longer taken into account.
“V” value increases in the manner of 0, 1, 2, 3 ... if [VOLUME]
knob is turned clockwise, or it decreases in the manner of 0, 9,
8, 7 ... if [VOLUME] knob is turned counterclockwise.

8. When [DISC 3] button is pressed after all LEDs and segments in

fluorescent indicator tube light up, the fluorescent indicator tube
displays “VACS A”. A is VACS level which is triggered by signal
level.

9. When [DISC SKIP/EX-CHANGE] button is pressed after all LEDs

and segments in fluorescent indicator tube light up, alternate
segments in fluorescent indicator tube would light up. If you
press [DISC SKIP/EX-CHANGE] button again, another half of
alternate segments in fluorescent indicator tube would light up.
When [DISC SKIP/EX-CHANGE] button is pressed again, all
segments lights off. Press [DISC SKIP/EX-CHANGE] button again
would cause all segments lights up.

10. To  release from this mode, press three buttons in the same

manner as step 1, or disconnect the power cord.

[COMMON TEST MODE]
• This mode is used to check operations of the respective sections

of Amplifier and Tape.

Procedure:
• To enter Common Test Mode
1. Press 

x

 button, [ILLUMINATION] button and [DISC 3] button

simultaneously.

2. The DVD ring indicators and the line below DVD ring indicator

flash synchronously on the fluorescent indicator tube. The
function is changed to TV where the function is changed to
DVD.

• Check of Amplifier
1. Press [EQ BAND/MEMORY] button repeatedly until a message

“GEQ MAX” appears on the fluorescent indicator tube. GEQ
increases to its maximum.

2. Press [EQ BAND/MEMORY] button repeatedly until a message

“GEQ MIN” appears on the fluorescent indicator tube. GEQ
decreases to its minimum.

3. Press [EQ BAND/MEMORY] button repeatedly until a message

“GEQ FLAT” appears on the fluorescent indicator tube. GEQ
is set to flat.

4. When the [VOLUME]  knob is turned clockwise even slightly,

the sound volume increases to its maximum and a message
“VOLUME MAX” appears on the fluorescent indicator tube.

5. When the [VOLUME]  knob is turned counterclockwise even

slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears on the fluorescent indicator
tube.

• Tape function
1. When a tape is inserted in Deck B and recording is started, the

function is changed to TV automatically. When [CD SYNC] button
is pressed during recording in function, ALC (Automatic Level
Control) is turned on.

2. During recording, press 

m

  button will stop the recording

and the function is changed to TAPE B and rewind the tape in
Deck B until the recording start position and playback of the
tape in Deck B is started. If the [REC PAUSE/START] button is
pressed for a pause and pressed again to resume recording during
recording time, when the tape is rewind, the tape will be rewind
until the position where the pause is applied.

• To release from Common Test mode
1. To release from this mode, press 

^/1

 button.

2. The cold reset is enforced at the same time.

[COLD RESET]
• 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. Press 

^/1

 button to turn on the system.

2. Press 

x

  button,  [ILLUMINATION]  button, and 

^/1

  button

simultaneously.

3. The message “COLD RESET” appears on the fluorescent

indicator tube. Then, the fluorescent indicator tube becomes
blank for a while, and the system is reset.

[VACS ON/OFF]
• This mode is used to switch on and off the VACS (Variable

Attenuation Control System).

Procedure:
1. Press 

^/1

 button to turn on the system.

2. Press 

x

 button, [DIRECTION] button and [DISC 1]

simultaneously. The message “VACS OFF” or “VACS ON”
appears on the fluorescent indicator tube.

[TUNER STEP CHANGE]
• The step interval of AM channels can be toggled between 9 kHz

and 10 kHz. This mode is not available for Saudi Arabia and
Russia models.