HCD-GN1200D, MHC-GN1200D - Sony Audio Service Manual (repair manual). Page 18

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

LEDs, buttons, MASTER VOLUME knob, OPERATION 
DIAL knob, model, destination, software version.

Procedure:
1. Press 

Y

 button, [ENTER] button and [DISC 2] button

   simultaneously.
2.  All LEDs and segments in fl uorescent indicator tube are light-

ed up. All LEDs are lighted up in red color except for 

C#

 

LED where the LED is lighted up in green color.

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

press [DISC 1] button. The model information appears on the 
fl uorescent indicator tube. 

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

from MC version, GC version, SYS version, DVD version, ST 
version, TC version, TA version, TM version in this order, and 
returns to the model information display.

5.  Press [DISC 2] button, the key check mode is activated.
6.   In the key check mode, the fl uorescent indicator tube displays 

“K  0  J0  V0”. 

 

Turn the [OPERATIONAL DIAL] clockwise; “J” value in-
creases by one. Turn the [OPERATIONAL DIAL] counter-
clockwise; “J” 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 [MASTER 

VOLUME] knob is turned clockwise, or it decreases in the 
manner of 0, 9, 8,7  ... if [MASTER VOLUME] knob is turned 
counterclockwise.

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

LEDs and segments in fl uorescent indicator tube light up, al-
ternate segments in fl uorescent indicator tube and LED would 
light up. If you press [EX-CHANGE/DISC SKIP] button 
again, another half of alternate segments in fl uorescent indica-
tor tube and LEDs would light up.  Pressing [EX-CHANGE/
DISC SKIP] button again would cause all LED and segments 
lights up.

8.  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 sec-

tions  of Amplifi er and Tape.

Procedure:
•  To enter Common Test Mode
1. Press 

Y

 button, [ENTER] button and [DISC 3] button si-

multaneously.

2.  The DVD ring indicators, the line below DVD ring indicators 

and TAPE A and B indicators fl ash synchronously on the fl uo-
rescent indicator tube. The function is changed to TV.

* Check 

of 

Amplifi er

1.   Press  [EQ BAND] button repeatedly until a message “GEQ 

MAX” appears on the fl uorescent indicator tube. GEQ increas-
es to its maximum.

2.  Press  [EQ BAND] button repeatedly until a message “GEQ 

MIN” appears on the fl uorescent indicator tube. GEQ decreas-
es to its minimum.

3.  Press  [EQ BAND] button repeatedly until a message “GEQ 

FLAT” appears on the fl uorescent indicator tube. GEQ set to 
fl at.

4.  When the [MASTER VOLUME] knob is turned clockwise 

even slightly, the sound volume increases to its maximum and 
a message “VOLUME MAX” appears on the fl uorescent indi-

cator tube.

5.  When the [MASTER VOLUME] knob is turned counter-clock-

wise even slightly, the sound volume decreases to its minimum 
and a message “VOLUME MIN” appears on the fl uorescent 
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 (Auto-
matic Logic Control) is turned on.

2.   During recording, press 

N

 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 [REC PAUSE/ START] button is 
pressed for a pause and pressed again to resume recording dur-
ing 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 

 

 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 

 

 button to turn on the system.

2. Press 

Y

 button, [ENTER] button and 

 

 button simulta-

neously.

3.  The message “COLD RESET” appears on the fl uorescent indi-

cator tube. Then, the fl uorescent indicator tube becomes blank 
for while, and the set is reset.

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

Attenuation Control System).

Procedure:
1. Press 

 

 button to turn on the system.

2. Press 

Y

 button and [ILLUMINATION] button simultane-

ously. The message “VACS OFF” or “VACS ON” appears on 
the fl uorescent 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 model.

Procedure:
1. Press 

 

 button to turn on the system.

2.  Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press 

 

 button to turn off the system.

4.  Press [ENTER] button and 

 

 button simultaneously. The 

system will turn on automatically. The message “AM 9K 
STEP” or “AM 10K STEP” appears on the fl uorescent indica-
tor tube and thus the channel step is changed.

[DVD SHIP MODE (WITH MEMORY CLEAR)]
•  This mode moves the optical pick-up to the position durable to 

vibration and clears all data including preset data stored in the 
RAM to initial conditions. Use this mode when returning the 
set to the customer after repair.