Test Mode; Tel 13942296513 - Sony HCD-GTX777 Service Manual

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[GC 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 x button, [DELAY] button and [DISC 2] button
simultaneously.
2. All LEDs and segments in fl uorescent indicator tube are lighted
up.
All LEDs are lighted up in red color except for
the LED is lighted up in red and blue 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 fl uorescent 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 SC 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, MM2 version and MTR 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 fl uorescent 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.
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"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 fl uorescent indicator tube light up, alternate
segments in fl uorescent indicator tube and LED would light up.
If you press [DISC SKIP/EX-CHANGE] button again, another half
of alternate segments in fl uorescent indicator tube and LEDs
would light up. Press [DISC SKIP/EX-CHANGE] button would
cause all segments in fl uorescent indicator tube and LED turns
off. 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 man-
ner as step 1, or disconnect the power cord.
[MC TEST MODE]
• This mode is used to check operations of the respective sections
of Amplifi er, Tuner and Tape.
Procedure:
• To enter MC Test Mode
1. Press x button, [DELAY] button and [DISC 3] button
simultaneously.
2. The CD ring indicators fl ash on the fl uorescent indicator tube.
The function is changed to VIDEO.
* Check of Amplifi er
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1. Press [EQ BAND/MEMORY] button repeatedly until a message
"GEQ MAX" appears on the fl uorescent indicator tube. GEQ
increases to its maximum.
2. Press [EQ BAND/MEMORY] button repeatedly until a message
.
"GEQ MIN" appears on the fl uorescent indicator tube. GEQ
decreases to its minimum.
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HCD-GTX777/GTX787/GTX888
SECTION 3
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TEST MODE

3. Press [EQ BAND/MEMORY] button repeatedly until a message
"GEQ FLAT" appears on the fl uorescent indicator tube. GEQ
is set to fl at.
4. When the [MASTER VOLUME] knob is turned clockwise even
slightly, the sound volume increases to its maximum and a mes-
sage "VOLUME MAX" appears on the fl uorescent 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 fl uorescent indicator
tube.
* Tape function
1. Insert a tape in deck. The function is changed to VIDEO au-
tomatically when the recording is started by pressing [REC TO
TAPE] then press [ENTER] button.
2. During recording, press m button will stop the recording and
the function is changed to TAPE and rewind the tape in Deck
until the recording start position and playback of the tape in
Deck is started.
* 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:
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1. Press x button, [DELAY] button and ?/1 button
simultaneously.
2. 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 ?/1 button to turn on the system.
2. Press x button and [OPTIONS] button simultaneously. 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.
Procedure:
1. Press ?/1 button to turn on the system.
2. Press [TUNER/BAND] button 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 fl uorescent indicator tube
and thus the channel step is changed.
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