Master Electronics Repair !: SONY HCD-GTKI1 - HOW TO ENTER THE SERVICE MODE, ADJUSTMENTS, DISASSEMBLY, SCHEMATIC DIAGRAMS

US model

Canadian model

Australian model

HCD-GTK1i

E Model

HCD-GTK1i - GTK2i

HCD-GTK1i is the tuner, USB and iPod section in FST-GTK1i and RDH-GTK1i.

HCD-GTK2i is the tuner, USB and iPod section in FST-GTK2i.

Front speaker:
Power Output (rated)
35 W + 35 W (at 6 W, 1 kHz, 1% THD) RMS output power (reference)
110 W + 110 W (per channel at 6 W, 1 kHz)
Subwoofer: RMS output power (reference)
230 W (8 W, 100 Hz)

HOME AUDIO DOCKING SYSTEM - Sony-STK433-090-E Power IC

Rest modes

UI TEST MODE
This mode is used to check LCD display, keys, VOLUME jog, model, destination, and software version.

1. Press [FUNCTION] button and [<< << Tuning--] button simultaneously and stay for 5 seconds.
2. All segments in the LCD are lighted up.
3. When press [|<< >> Tuning --] button, the display changes to model name. When press [|<< << Tuning --] button again, the display will change to model destination. When continue press [|<< << 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 [>> >>|] button is pressed, half of alternate segments in the LCD are lighted up. If you press [>> >>|] button again, another half of alternate segments in the LCD are lighted up. Press [>> >>| Tuning+] button again, all segments will lights off and press [>> >>| Tuning+] button again, all segments will lights up.
6. Press [>||] 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 counter clockwise.

To release from UI Test mode

1. To release from this mode, Press [FUNCTION] button and [>> >>|] 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 Amplifier

To enter MC Test Mode
1. Press [>> >>| 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 Amplifier
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 flat.

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 counter clockwise 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.
Procedure:
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)

Procedure:
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.

During power on, press [TUNER/BAND] button on the remote control or [FUNCTION] button until show “TUNER AM” on the LCD.
2. Press [>||] 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.
Procedure:
1. During Power on, Press [>||] button and [|<< << 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 [>||] button and [|<< << Tuning --] button simultaneously and stay for 5 seconds or disconnect the power cord.

Factory preset [HCD-GTK1i/GTK2i]

FACTORY PRESET
This mode is use to load all the factory use preset frequency into FM 1-FM 20 and AM 1-AM 10.

Press [>> >>| Factory +] button and [m TUNING –] button simultaneously and stay for 5 seconds.
2. If the current function is not TUNER AM or TUNER FM, it will automatically switch to TUNER FM function. The message “FACTORY” appears on the LCD for 2 seconds and tuning mode will change to preset mode. Frequency of FM 1-FM 20 and AM 1-AM10 are set to the minimum frequency.

SIRCS DISABLE TEST MODE
This mode is used to switch ON and OFF the SIRCS (Standard Code for Infrared Remote Control System).

During power on, press [>> >>| Tuning +] button and [GROOVE] button simultaneously and stay for 5 seconds. The message “SIRCS ON” or “SIRCS OFF” appears on the LCD for 2 seconds.

To release from SIRCS DISABLE TEST MODE
1. To release from this mode, press [>> >>| Tuning +] button and [GROOVE] button simultaneously and stay for 5 seconds.

FM AUTO STOP CHECK

1.Turn the power on.
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
Modulation
ANT input

: 75 kHz
: 1 kHz
: 35 dBu (EMF)

Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with automatic scanning.
4. Confirm that input Frequency of A, B and C detected and automatic scanning stops.
The stop of automatic scanning means “The station signal is received in good condition”.

Disassembly procedure.

Top panel: Block and Back assembly; Power SWB board, Trans board and DC fan.