Sony HCD-GPX888 – How to enter to test mode – Cold reset procedure

TEST MODE

PANEL TEST MODE
This mode is used to check the fluorescent indicator tube, LEDs, keys, [VOLUME / DJ CONTROL] jog, model, destination and software version.
Procedure:
1. Press [OPTIONS] button and [FOOTBALL] button simultaneously and hold 3 seconds.
2. All LEDs and segments in fluorescent indicator tube are lighted up. All RGB LEDs are lighted up in white color.
3. When you want to enter to the software version display mode, press [UP] button.
The model information appears on the fluorescent indicator tube.

“GNX5” is shown for ----GPX555.
“GNX8” is shown for ----GPX888.
Press [ UP] button again to view the destination information.

4. During the destination information display, press [UP] button. Each time [UP] button is pressed, the fluorescent indicator tube shows the version of each category software in the following sequence: SC, MTK, OPU, UI, PF, SYS, CD, CDMA,CDMB, ST, TA, TM, and return back to model information display.
5. When [STOP] button is pressed while the version numbers are being displayed except model and destination, the date of the software creation appears. When [STOP] button is pressed again, the display returns to the software version display.

6. Press [UP] button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays “K 0 V0”.
Each time a button is pressed, “K” value increases.
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 [ENTER] button is pressed after all LEDs and segments in fluorescent indicator tube light up, alternate segments in fluorescent indicator tube and LEDs would light up, all RGB LEDs would light up in red color. If you press [ENTER] button again, another half of alternate segments in fluorescent indicator tube and LEDs would light up, all RGB LEDs would light up in green color. Pressing [ENTER] button again would cause all segments in fluorescent indicator tube and LEDs light up, all RGB LEDs would light up in blue color. Pressing [ENTER] button again would turn off all segments in fluorescent indicator tube and all LEDs including RGB LEDs.
9. To release from this mode, press the buttons in the same manner as step 1, or disconnect the power cord.

USER RESET
The user reset clears all data including preset data stored in the data flash to initial conditions exclude history mode data.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [STOP] button and [MOVIE/GAME] button simultaneously for 3 seconds.
3. “RESET” appears on the fluorescent indicator tube. After that, the fluorescent indicator tube becomes blank for a while, and the system is reset.

COLD RESET
The cold reset clears all data including preset data stored in the data flash to initial conditions included history mode data.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [STOP] button and [PAN] button simultaneously for 3 seconds.
3. “COLD RESET” appears on the fluorescent indicator tube. After that, the fluorescent indicator tube becomes blank for a while, and the system is reset.

CD TRAY LOCK MODE
This mode let you lock the disc tray. When this mode is activated, the disc tray will not open when [OPEN/CLOSE] button is pressed.
The message “LOCKED” will be displayed on the fluorescent indicator tube. This mode only applied when there is disc(s) on the tray.
Procedure:
1. Press [POWER] button to turn on the system.
2. Select CD function.
3. Press [STOP] button and [BASS BAZUCA] button simultaneously and hold down until “LOCKED” or “UNLOCKED” displayed on the fluorescent indicator tube (around 5 seconds).

HISTORY MODE
This mode is used to check important data stored in the system when PROTECTOR happen.
Procedure:
1. During demo mode, press [OPTIONS] button and [FLANGER] for 5 seconds to mode in to history mode.
2. Press the [NEXT/ TUNING+] or [NEXT / TUNING-] button to check history data stored.

ERROR CODES

Error Code	Description
E01	The over current condition to MOSFET occurs by defect of MOSFET or defect of PS output line.
E03	Defect of power supply circuit to AMP. There is possibility of unusual power supply of any of the AMP IC or Pre-amplifier.
E04	DC appears in SP terminal by defect of AMP IC and MOSFET or Defect of DC FAN and DC FAN driver circuit.
E05	Unusual heat up of MOSFET by improper assembly of heat sink, destruction of MOSFET etc.