SONY HCD-GT55
Manual de Servicio

HCD-GT22/GT44/GT55 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 x , u and [GROOVE] simultaneously. 2. The message �COLD RESET� is displayed on the fluorescent indicator tube momentarily, then becomes standby states.

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 button to turn the power on. 2. Press three buttons of x , u and [USB] 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 [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 I/1 button to the power off.

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 u and I/1 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 x , [ILLUMINATION] and I/1 simultaneously. 4. The message �COLD RESET� is displayed on the fluorescent indicator tube momentarily, then becomes standby states.

MC TEST MODE
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 x , u and [AUDIO] simultaneously. 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. 7. Press the [TAPE 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.

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. Insert a disc. 4. Press two buttons of x and Z for 5 seconds. 5. The message �LOCKED� is displayed on the fluorescent indicator tube and the disc table is locked. (Even if pressing the Z button, the message �LOCKED� is displayed on the fluorescent indicator tube and the disc table is locked) 6. To release this mode, press two buttons of x and Z for 5 seconds. 7. The message �UNLOCKED� is displayed on the fluorescent indicator tube and the disc table is unlocked.

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