Sony HCD-GX470, Service Manual

Page: 17 / 106

17
HCD-GX470/GX570
SECTION 4
TEST MODE
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 three buttons of
s
,
7
and [DISC 1] simultaneously.
2. The message “COLD RESET” is displayed on the fluorescent
indicator tube momentarily, then becomes standby states.
TUNING STEP CHANGE-OVER
A step of AM tuning interval can be changed over between 9 kHz
and 10 kHz.
Procedure:
1. Press the
I / 1
button to turn the power on.
2. Press the
[TUNER/BAND]
button to select “AM”.
3. Press the
I / 1
button to turn the power off.
4. Press two buttons of
[TUNING --]
and
I
/
1
simultaneously.
5. The message “AM 9K STEP” or “AM 10K STEP” is displayed
on the fluorescent indicator tube, and thus the tuning interval
is changed over.
CD SHIP (LOCK) MODE
This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
1. Press the
I
/
1
button to turn the power on.
2. Press the
[CD]
button to select “CD”.
3. Press two buttons of
7
and
[POWER]
simultaneously.
4. The message “LOCK” is displayed on the fluorescent indicator
tube, and the CD ship mode is set.
CD SHIP (LOCK) MODE & COLD RESET
This mode is used to perform CD ship (lock) mode and cold reset
simultaneously.
Procedure:
1. Press the
I /
1
button to turn the power on.
2. Press the
[CD]
button to select “CD”.
3. Press three buttons of
s
,
[CD]
and
A
simultaneously.
4. The message “COLD RESET” is displayed on the fluorescent
indicator tube momentarily, then becomes standby states.
ANTITHEFT LOCK MODE
This mode is used to unable to take sample disc out of disc table in
the shop.
Procedure:
1. Press the
I / 1
button to turn the power on.
2. Press the
[CD]
button to select “CD”.
3. Press two buttons of
s
and
A
for 5 seconds.
4. The message “LOCKED” is displayed on the fluorescent
indicator tube and the disc table is locked. (Even if pressing
the
A
button, the message “LOCKED” is displayed on the
fluorescent indicator tube and the disc table is locked)
5. To release this mode, press two buttons of
s
and
A
for 5
seconds.
6. The message “UNLOCKED” is displayed on the fluorescent
indicator tube and the disc table is unlocked.
AMP TEST MODE (GX470 ONLY)
This mode is used to display the parameter of amplifier IC and
display the VACS status.
Procedure:
1. Press the
I / 1
button to turn the power on.
2. Press three buttons of
s
,
7
and
A
simultaneously.
3. When the AMP test mode is activated, the message “AMP
TEST IN” is displayed on the fluorescent indicator tube
momentarily, then amplifier adjustment mode is displayed on
the fluorescent indicator tube.
4. Press the
[REC PAUSE/START]
button to changed over between
VACS status display mode and the amplifier IC parameter
display mode.
5. In this mode, press the
[ENTER]
button to changed over DBFB
on/off, and “DBFB ON” or “DBFB OFF” is displayed on the
fluorescent indicator tube.
6. In this mode, press the
[SURROUND]
button to changed over
surround on/off, and “SURROUND ON” or “SURROUND
OFF” is displayed on the fluorescent indicator tube.
7. In this mode, press the
[EQ BAND]
button to enter the equalizer
adjustment mode.
In the equalizer adjustment mode, press the
[EQ BAND]
button
to change over the adjustment band as LOW/MID/HIGH. And
turn the multi jog knob to adjust the equalizer level of each
bands.
8. To release the amplifier IC parameter display mode or equalizer
adjustment mode, press the
I / 1
button to the power off.
MC TEST MODE (GX470 ONLY)
This mode is used to check operations of microprocessor.
Procedure:
1. Press the
I / 1
button to turn the power on.
2. Press three buttons of
s
,
7
and
[DISC 3]
simultaneously.
3. When the MC test mode is activated, VACS level is displayed
on the fluorescent indicator tube momentarily.
4. Turn the multi jog knob clockwise, the message “ALL EQ
MAX” is displayed on the fluorescent indicator tube
momentarily and turn the multi jog knob counter-
clockwise, the message “ALL EQ MIN” is displayed on
the fluorescent indicator tube momentarily.
5. Press the
[ENTER]
button, the message “ALL EQ FLAT” is
displayed on the fluorescent indicator tube momentarily.
6. Turn the
[VOLUME]
knob clockwise, the message “VOLUME
MAX” is displayed on the fluorescent indicator tube
momentarily and turn the
[VOLUME]
knob counterclockwise,
the message “VOLUME MIN” is displayed on the fluorescent
indicator tube momentarily.
7. Press the
[REC PAUSE/START]
button to changed over VACS
on/off.
8. Press the
I / 1
button to release from this mode, then cold reset
is performed.