FST-GTK1I, FST-GTK2I, HCD-GTK1I, HCD-GTK2I, RDH-GTK1I - Sony Audio Service Manual (repair manual). Page 9

UI TEST MODE
 •  This mode is used to check LCD display, keys, VOLUME 

jog, model, destination, and software version.

 

1.  Press [FUNCTION] button and [. m TUNING –] 

button simultaneously and stay for 5 seconds.

 

2.  All segments in the LCD are lighted up. 

 

3.  When press [. m TUNING –] button, the display 

changes to model name. When press [. m TUNING –]
button again, the display will change to model destination. 
When continue press [. m TUNING –] button again, 
the display will show software version of the software 
creation. The sequence is model name, model destination, 
SC, SY, PF, UI, M1, M2, I1, I2, TA, and ST, in this order, 
and returns to the model name display. 

 

4.  When you want to know the release date of the software 

version, press [PRESET EQ] button during display 
software version. Press [PRESET EQ] button again, the 
same software version will display on the LCD.

 5. 

When 

[M > TUNING +] button is pressed, half of 

alternate segments in the LCD are lighted up. 
If you press [M > TUNING +] button again, another 
half of alternate segments in the LCD are lighted up. 
Press [M > TUNING +] button again, all segments 
will lights off and press [M > TUNING +] button 
again, all segments will lights up.

 6. 

Press 

[u] button, the key check mode is activated. In 

the key check mode, the LCD displays “K 0 V0”. 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. When all the keys on the main unit 
have been pressed, the LCD display will show “OK” and 
“K 8” alternately. For US and Canadian model, the LCD 
display will show “OK” and K 7” alternately. 
“V” value increases in the manner of 0, 1, 2, 3 ... if 
[VOLUME] knob is turned clockwise, or it decreases in 
the manner of 0, 9, 8, 7  ... if [VOLUME] knob is turned 
counterclockwise.

 •  To release from UI Test mode
 

1.  To release from this mode, Press [FUNCTION] button 

and [M > TUNING +] button simultaneously and 
stay for 5 seconds or disconnect the power cord.

MC TEST MODE
 •  This mode is used to check operations of the respective 

sections of Amplifi er.

Procedure:
 •  To enter MC Test Mode
 1. 

Press 

[M > TUNING +] button and [PRESET EQ] 

button simultaneously and stay for 5 seconds.

 

2.  The upper segments of LCD will blink. The function is 

changed to AUDIO IN.

• Check 

of 

Amplifi er

 

1.  Press [PRESET EQ] button repeatedly until a message 

“GEQ MAX” appears on the LCD. GEQ increases to its 
maximum.

 

2.  Press [PRESET EQ] button repeatedly until a message 

“GEQ MIN” appears on the LCD. GEQ decreases to its 
minimum.

 

3.  Press [PRESET EQ] button repeatedly until a message 

“GEQ FLAT” appears on the LCD. GEQ is set to fl at.

 

4.  When the [VOLUME] knob is turned clockwise even 

slightly, the sound volume increases to its maximum and 
a message “VOL MAX” appears on the LCD.

 

5.  When the [VOLUME] knob is turned counterclockwise 

even slightly, the sound volume decreases to its minimum 
and a message “VOL MIN” appears on LCD.

•  To release from MC Test mode
 

1.  To release from this mode, press [u] button and 

[GROOVE] button simultaneously and stay for 5 seconds.

 

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.

1. Press 

[u] button and [GROOVE] button simultaneously 

and stay for 5 seconds.

2.  The LCD becomes blank for a while, and the set is reset 

when power off.

3.  The LCD will show “RESET”, and the set is reset when 

power on.

VACS ON/OFF
 •  This mode is used to switch ON and OFF the VACS (Variable 

Attenuation Control System).

1.  During power on, press [FUNCTION] button and 

[GROOVE] button simultaneously and stay for 5 seconds. 
The message “VACS ON” or “VACS OFF” appears on 
the LCD for 2 seconds.

TUNER STEP CHANGE
 •  The step interval of AM channels can be toggled between 

9kHz and 10kHz.

1.  During power on, press [TUNER/BAND] button on 

the remote control or [FUNCTION] button until show 
“TUNER AM” on the LCD.

2. Press 

[u] button and [PRESET EQ] button 

simultaneously and stay for 5 seconds. The message “9K 
STEP” or “10K STEP” appears on the LCD and thus the 
channel step is changed.

VACS DISPLAY
 •  This mode is used to check the VACS level.

1.  During Power on, Press [u] button and 

[. m TUNING –] button simultaneously and stay 
for 5 seconds.

2.  The VACS Level Display as “VA APB”. “V” represents 

VACS, A represent VACS level which is triggered by 
signal level, “AP” represents APVACS (Abuse Protection 
VACS) and “B” represents APVACS level which is 
triggered.

 •  To release from VACS DISPLAY
 

1.   To release from this mode, press [u] button and 

[. m TUNING –] button simultaneously and stay 
for 5 seconds or disconnect the power cord.