Test Mode - Sony HCD-GTX88 Service Manual

[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube, LEDs,
buttons, MASTER VOLUME knob, OPERATION DIAL knob,
model, destination, software version.
Procedure:
1. Press x button, [ENTER] button and [DISC 2] button
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up.
All LEDs are lighted up in red color except for NX LED
where the LED is lighted up in green color.
3. When you want to enter to the model version and destination
display mode, press [DISC 1] button. The model information
appears on the fluorescent indicator tube.
4. Each time [DISC 1] button is pressed, the display changes to
display software version and date of the software creation. The
sequence is MC version, GC version, SYS version, CD version,
CDDM version, CDMA version, CDMB version, BDA version,
BDB version, ST version, TC version, TA version, TM version,
MM1 version and MM2 version in this order, and returns to the
model version display.
5. Press [DISC 2] button, the key check mode is activated.
6. In the key check mode, the fluorescent indicator tube displays
"K 0 J0 V0".
Turn the [OPERATIONAL DIAL] clockwise; "J" value increases
by one. Turn the [OPERATIONAL DIAL] counterclockwise; "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 [DISC SKIP/EX-CHANGE] button is pressed after all LEDs
and segments in fluorescent indicator tube light up, alternate
segments in fluorescent indicator tube and LED would light up.
If you press [DISC SKIP/EX-CHANGE] button again, another half
of alternate segments in fluorescent indicator tube and LEDs
would light up. Pressing [DISC SKIP/EX-CHANGE] 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.
[MC TEST MODE]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner and Tape.
Procedure:
• To enter MC Test Mode
1. Press x button, [ENTER] button and [DISC 3] button
simultaneously.
2. The CD ring indicators and TAPE A and B indicators flash on
the fluorescent indicator tube. The function is changed to
VIDEO.
* 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.
SECTION 3

TEST MODE

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 fluorescent indicator
tube.
5. When the [MASTER VOLUME] knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and a
message "VOLUME MIN" appears on the fluorescent indicator
tube.
* Tape function
1. Insert a tape in dack B. The function is changed to VIDEO
automatically when the recording is started by pressing [CD-
TAPE SYNC] then press [TAPE REC PAUSE/START] button.
During recording the ALC (Automatic Logic 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 [TAPE 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 MC 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, [ENTER] button and ?/1 button
simultaneously.
3. The message "COLD RESET" appears on the fluorescent
indicator tube. Then, the fluorescent 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 ?/1 button to turn on the system.
2. Press x button and [ILLUMINATION] button 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 model.
Procedure:
1. Press ?/1 button to turn on the system.
2. Press [TUNER/BAND] button repeatedly to select the "AM".
3. Press ?/1 button to turn off the system.
4. Press [ENTER] button and ?/1 button simultaneously. The
system will turn on automatically. The message "AM 9K STEP"
or "AM 10K STEP" appears on the fluorescent indicator tube
and thus the channel step is changed.
HCD-GTX88
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