Test Mode - Sony HCD-GT22 Service Manual

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
x
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 button to turn the power on.
I/1
2. Press the [TUNER/BAND] button to select "AM".
3. Press the button to turn the power off.
I/1
4. Press two buttons of [TUNING +] and
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 button to turn the power on.
I/1
2. Press the [CD] button to select "CD".
3. Press two buttons of
u
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 button to turn the power on.
I/1
2. Press the [CD] button to select "CD".
3. Press three buttons of
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 button to turn the power on.
I/1
2. Press the [CD] button to select "CD".
3. Insert a disc.
4. Press two buttons of and
x
5. The message "LOCKED" is displayed on the fluorescent
indicator tube and the disc table is locked. (Even if pressing
the button, the message "LOCKED" is displayed on the
Z
fluorescent indicator tube and the disc table is locked)
6. To release this mode, press two buttons of
seconds.
7. The message "UNLOCKED" is displayed on the fluorescent
indicator tube and the disc table is unlocked.
SECTION 4

TEST MODE

and [GROOVE] simultaneously.
,
u
simultaneously.
I/1
and simultaneously.
I/1
, [ILLUMINATION] and
x
for 5 seconds.
Z
and
x Z
AMP TEST MODE
This mode is used to display the parameter of amplifier IC and
display the VACS status.
Procedure:
1. Press the
I/1
2. Press three buttons of
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 [TAPE 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 [GROOVE] 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.
For GT22/GT44
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 [OPERATION DIAL] knob to adjust the equalizer level
of each bands.
For GT55
7. In this mode, press the [BASS], [VOCAL] or [GUITAR] button
to enter the parametric equalizer adjustment mode.
In the parametric equalizer adjustment mode, press the [BASS],
[VOCAL] and [GUITAR] button to change over the adjustment
band. And press the [BASS], [VOCAL] or [GUITAR] button to
change over the equalizer frequency of each bands, or press
the [+] and [--] buttons to adjust the equalizer level of each
bands.
8. To release the amplifier IC parameter display mode or equalizer
adjustment mode, press the
MC TEST MODE
I/1
This mode is used to check operations of microprocessor.
Procedure:
1. Press the
I/1
2. Press three buttons of
3. When the MC test mode is activated, VACS level is displayed
on the fluorescent indicator tube momentarily.
4. Press the [TUNING +] button, the message "ALL EQ MAX"
is displayed on the fluorescent indicator tube momentarily
and press the [TUNING --] button, 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.
for 5
7. Press the [TAPE REC PAUSE/START] button to changed over
VACS on/off.
8. Press the
I/1
is performed.
HCD-GT22/GT44/GT55
button to turn the power on.
and [USB] simultaneously.
,
x u
button to the power off.
I/1
button to turn the power on.
and [AUDIO] simultaneously.
,
x u
button to release from this mode, then cold reset
15