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This mode is used to check the fl uorescent indicator tube, LEDs, 
keys, [MASTER VOLUME] jog, [OPERATION DIAL] jog, mod-
el, destination and software version.
Procedure:
1. Press 

[

x

], [METER MODE] and [DISC 2] buttons simultane-

ously.

2.  All LEDs and segments in fl uorescent indicator tube are light-

ed up.

3.  When you want to enter to the software version display mode, 

press [DISC 1] button. The model information appears on the 
fl uorescent indicator tube. “GTL 2S” or “GTL 2SI” is shown 
for HCD-GTZ4/GTZ4i, “GTL 3S” is shown for HCD-GTZ5. 
Press [DISC 1] button again to view the destination informa-
tion.

4.  During the destination information display, press [DISC 1] 

button. Each time [DISC 1] button is pressed, the fl uorescent 
indicator tube shows the version of each category software 
in the following sequence: SC, MTK (DMB board fi rmware 
version), GC, SYS, CD, CDMA, CDMB, ST, TA, TM, MTR 
(METER) and return back to model information display.

5.  When [DISC 3] button is pressed while the version numbers 

are being displayed except model and destination, the date 
of the software creation appears. When [DISC 3] button is 
pressed again, the display returns to the software version dis-
play. When [DISC 1] button is pressed while the date of the 
software creation is being displayed, the date of the software 
creation is displayed in the same order of software version dis-
play.

6.  Press [DISC 2] button, the key check mode is activated.
7.  In the key check mode, the fl uorescent indicator tube displays 

“K 0 J0 V0”.

 

Each time a button is pressed, “K” value increases. However, 
once a button has been pressed, it is no longer taken into ac-
count. 

 

“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.

 

“J” value increases in the manner of 0,1, 2, 3 ... if [OPERATION 
DIAL] knob is turned clockwise, or it decreases in the manner 
of 0, 9, 8, 7 ... if [OPERATION DIAL] knob is turned 
counterclockwise.

8.  When [DISC SKIP/EX-CHANGE] button is pressed after all 

LEDs and segments in fl uorescent indicator tube light up, al-
ternate segments in fl uorescent indicator tube and LEDs would 
light up. If you press [DISC SKIP/EX-CHANGE] button 
again, another half of alternate segments in fl uorescent indi-
cator tube and LEDs would light up.  Pressing [DISC SKIP/
EX-CHANGE] button again would cause all segments in fl uo-
rescent indicator tube and LEDs light up.

9.  To release from this mode, press three buttons in the same 

manner as step 1, or disconnect the power cord.

This mode is used to check operations of the respective amplifi er 
section.

To enter common test mode
Procedure:
1. Press 

[

x

], [METER MODE] and [DISC 3] buttons simultane-

ously.

2.  The CD ring indicators fl ash on the fl uorescent indicator tube. 

The function is changed to PC and the volume is changed to 
VOLUME MIN.

Check of amplifi er
Procedure:
1.  Press [EQ BAND] button repeatedly until a message “GEQ 

MAX” appears on the fl uorescent indicator tube. GEQ increas-
es to its maximum.

2.  Press [EQ BAND] button repeatedly until a message “GEQ 

MIN” appears on the fl uorescent indicator tube. GEQ decreas-
es to its minimum.

3.  Press [EQ BAND] 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 message “VOLUME MAX” appears on the fl uorescent indi-
cator tube.

5.  When the [MASTER VOLUME] knob is turned counterclock-

wise even slightly, the sound volume decreases to its minimum 
and a message “VOLUME MIN” appears on the fl uorescent 
indicator tube.

To release from common test mode
Procedure:
1.  To release from this mode, press [

?/1

 STANDBY] button.

2.  The cold reset is enforced at the same time.

The cold reset clears all data including preset data stored in the 
EEPROM to initial conditions. Execute this mode when returning 
the set to the customer.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2. Press 

[

x

], [ENTER] and [

?/1

 STANDBY] buttons simultane-

ously.

3.  “COLD RESET” appears on the fl uorescent indicator tube. 

After that, the fl uorescent indicator tube becomes blank for a 
while, and the system is reset.

This mode is used to switch ON and OFF the VACS (Variable At-
tenuation Control System).
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2. Press [

x

], [DISC 2] and [DISPLAY] buttons simultaneously. 

The message “VACS OFF” or “VACS ON” appears on the 
fl uorescent indicator tube.

The step interval of AM channels can be toggled between 9 kHz 
and 10 kHz. This mode is not available for AEP model.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2.  Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press 

[

?/1

 STANDBY] button to turn off the system.

4.  Press [ENTER] and [

?/1

 STANDBY] buttons simultaneous-

ly. The system turns on automatically. The message “AM 9K 
STEP” or “AM 10K STEP” appears on the fl uorescent indica-
tor tube and thus the channel step is changed.

This mode moves the optical pick-up to the position durable to 
vibration and clears all data including preset data stored in the EE-
PROM to initial conditions during the next AC-In. Use this mode 
when returning the set to the customer after repair.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2.  Press [CD] button to select CD function.
3. Press 

[

x], [DISC 1] and [

?/1

 STANDBY] buttons simultane-

ously. The system turns off automatically.

4.  After the “STANDBY” blinking display fi nishes, a message 

“MECHA LOCK” is displayed on the fl uorescent  indicator 
tube and the CD ship mode is set.

5.  Unplug the power supply cable.

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 

[

?/1

 STANDBY] button to turn on the system.

2.  Press [CD] button to select CD function.
3.  Press [DISC SKIP/EX-CHANGE] and [

?/1

 STANDBY] but-

tons simultaneously. The system turns off automatically.

4.  After the “STANDBY” blinking display fi nishes, a message 

“MECHA LOCK” is displayed on the fl uorescent  indicator 
tube and the CD ship mode is set.

5.  Unplug the power supply cable.

This mode let you lock the disc tray. When this mode is activat-
ed, the disc tray will not open when [

Z OPEN/CLOSE] button 

or [DISC SKIP/EX-CHANGE] button is pressed. The message 
“LOCKED” will be displayed on the fl uorescent indicator tube.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2.  Press [CD] button to select CD function.
3. Press 

[

x] and [Z OPEN/CLOSE] buttons simultaneously and 

hold down until “LOCKED” or “UNLOCKED” displayed on 
the fl uorescent indicator tube (around 5 seconds).

This mode is use to load all the factory use preset frequencies 
into FM 1-FM 20 and AM 1-AM 10. Originally, frequency of FM 
1-FM 20 and AM 1-AM10 are set to the minimum frequency.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2. Press [SURROUND], [

x] and [DISC 1] buttons simultane-

ously and the message “FACTORY” appears on the fl uores-
cent indicator tube. The function is changed to TUNER auto-
matically.

This mode is used to check the VACS level.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2.  Press [ERASE], [

x] and [ENTER] buttons simultaneously.

3. The fl uorescent indicator tube displays “VACSx”. “x” repre-

sents Conventional VACS level (Triggered by signal level).

4.  To release from this mode, do the step 2 again.

This mode is used to display the total count of meter pointer touch 
initial switch and max switch.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2. Press 

[

x], [ENTER] and [DISPLAY] buttons simultaneously.

3. The 

fl uorescent indicator tube displays “IxxxxxMyyyyy”. 

 

“I” represents the Initial Switch touch. 

 

“xxxxx” represents the total count of Initial Switch touch.

 

(Maximum Value of “xxxxx” = 65535)

 

“M” represents the Max Switch touch. 

 

“yyyyy” represents the total count of Max Switch touch.

 

(Maximum Value of “yyyyy” = 65535)

4.  To release from this mode, do the step 2 again. The fl uorescent 

indicator tube displays “MODE OUT”. 

This mode is used to check the meter device.
Procedure:
1. Press 

[

?/1

 STANDBY] button to turn on the system.

2. Press [

x], [ENTER] and [METER MODE] buttons simulta-

neously. The fl uorescent indicator tube displays “TST MODE 
IN”.

3.  Meter Backlight LEDs, Meter Pointer LEDs, Power Illumina-

tor LEDs and fl uorescent indicator tube are lighted up. 

4.  When you want to perform count total step from Initial Switch 

to Max Switch operation mode, press [TUNING + 

> M] 

button. The meter pointer will move from Initial Switch to 
Max Switch and fi nally move back to the middle position. The 
total step count information appears on the fl uorescent indica-
tor tube. “xxx STP yy” is shown.

 

“xxx” represents the total step.

 

(Value of “xxx” should between 430 steps to 470 steps)

 

“yy” represents the status of total step count.

 

(If total step between 430 steps to 470 steps, “yy” is OK,  Else 
“yy” is NG)

5.  When you want to perform count total step from Max Switch 

to Initial Switch operation mode, press [TUNING – 

. m] 

button. The meter pointer will move from Max Switch to Ini-
tial Switch and fi nally move back to the middle position. The 
total step count information appears on the fl uorescent indica-
tor tube. “xxx STP yy” is shown.

 

“xxx” represents the total step.

 

(Value of “xxx” should between 430 steps to 470 steps)

 

“yy” represents the status of total step count.

 

(If total step between 430 steps to 470 steps, “yy” is OK, else 
“yy” is NG).

6.  To release from this mode, do the step 2 again. The fl uorescent 

indicator tube displays “TST MODE OUT”. 

Procedure:
1.  Turn on the set.
2.  Input the following signal from signal generator to FM antenna 

input directly.

 
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation 

: 75 kHz

Modulation 

: 1 kHz

ANT input 

: 35 dBu (EMF)

Note: Use 75 ohm coaxial cable to connect signal generator and the set. 

You cannot use video cable for checking.

 

  Use signal generator whose output impedance is 75 ohm. 

 
3.  Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C signals.
 
When the selected station signal is received in good condition, 
“TUNED” is displayed.