DOWNLOAD Sony HCD-GTR333 / HCD-GTR555 / HCD-GTR777 / HCD-GTR888 / MHC-GTR333 / MHC-GTR555 / MHC-GTR777 / MHC-GTR888 Service Manual ↓ Size: 6.3 MB | Pages: 107 in PDF or view online for FREE

1 two screws

6 one screw

7 SWITCH board

2 CN703 (4P)

3 CN704 (2P)

4  wire (flat type) (5 core)

5 DRIVER board

1 floating screw

4 floating screw

8 one screw

6 floating screw

7 gear (geneva)

2 tray

3 belt (table)

9 CN731

0 SENSOR board

5 pulley (table)

3 wire (flat type) (5 core)

4 two screws

5 motor assy, table (M741)

6 remove the two solderings of motor

7 MOTOR (TB) board

1 gear (stopper)

1 gear (stopper)

2

1 belt (loading)

2 remove the two solderings of motor

4 motor assy, loading (M751)

5 MOTOR (LD) board

3 two screws

 

•  This mode is used to check the fl uorescent indicator tube, 

LEDs, keys, [MASTER VOLUME] jog, model, destination
and software version.

 Procedure:
 

1. Press [TV] button and [OPTION] button simultaneously 

and hold 3 seconds.

 

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

lighted up. 

 

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

mode, press [PRESET EQ] button. The model information 
appears on the fl uorescent indicator tube.

 

  • “GFX 2”  is shown for MHC-GTR333.

 

  • “GFX 3S”  is shown for MHC-GTR555.

 

  • “GFX 4S”  is shown for MHC-GTR777.

 

  • “GFX 7S”  is shown for MHC-GTR888.

 

Press [PRESET EQ] button again to view the destination 
information.

 

4.  During the destination information display, press [PRESET

EQ] button. Each time [PRESET EQ] 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), UI, PF, SYS, CD, CDMA, 
CDMB, ST, TA TAS, TM and return back to model 
information display.

 

5. When [SEARCH] button is pressed while the version 

numbers are being displayed except model and destination, 
the date of the software creation appears. When [SEARCH] 
button is pressed again, the display returns to the software 
version display. When [PRESET EQ] 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 display.

 

6.  Press [GROOVE] button, the key check mode is activated.

 

7.  In the key check mode, the fl uorescent indicator tube displays

“K 0    V0”.

 

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

 

“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.

 

8.  When [DJ EFFECT] button is pressed after all LEDs and

segments in fl uorescent indicator tube light up, alternate
segments in fl uorescent indicator tube and LEDs would 
light up. If you press [DJ EFFECT] button again, another 
half of alternate segments in fl uorescent indicator tube and 
LEDs would light up.  Pressing [DJ EFFECT] button again 
would cause all segments in fl uorescent 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 Amplifi er 

section.

 Procedure:
 

•  To enter Common Test Mode

 

1.  Press [USB/USB SELECT] button and [GROOVE] button 

simultaneously and hold for 3 seconds.

 

2. The bar segment fl ash on the fl uorescent indicator tube. 

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

 • 

Check 

of 

Amplifi er

 

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

“GEQ MAX” appears on the fl uorescent indicator tube. 
GEQ increases to its maximum.

 

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

“GEQ MIN” appears on the fl uorescent indicator tube. 
GEQ decreases to its minimum.

 

3. Press [PRESET EQ] 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
indicator tube.

 

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

clockwise 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

 

1.  To release from this mode, press [POWER] 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 [POWER] button to turn on the system.

  

2. 

Press [

x

] button and [POWER] button simultaneously

 

   

for 3 seconds.

 

 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.

 

•  The step interval of AM channels can be toggled between  

9 kHz and 10 kHz. This mode is not available for Saudi 
Arabian, European and Russian models.

 • 

Procedure:

 

  1. 

Press [POWER] button to turn on the system.

 

  2. 

Press [FUNCTION] button repeatedly to select the

  

“AM”.

 

  3. 

Press [POWER] button to turn off the system.

 

  4.  Press [SEARCH] button and [POWER] button 
   

simultaneously. The system turns on automatically.

 

   

The message “AM  9K STEP” or “AM  10K STEP”

   

appears on the fl uorescent indicator 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 EEPROM to initial conditions during the next 
AC-In. Use this mode when returning the set to the customer
after repair.

 • 

Procedure:

 

  1. 

Press [POWER] button to turn on the system.

 

  2. 

Select CD function.

 

  3.  Press [GROOVE] button and [POWER] button 
   

simultaneously for 3 seconds. The system turns off

  

automatically.

 

  4.  Message “MECHA LOCK” is displayed on the
   

fl uorescent indicator tube and the CD ship mode

  

is 

set.

 

•  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 [POWER] button to turn on the system.

 

  2.  Select CD function.

 

  3.  Press [EX-CHANGE] button and [POWER] button 

simultaneously. The system turns off automatically.

 

  4.  Message “MECHA LOCK” is displayed on the 

fl uorescent indicator tube and the CD ship mode is 
set.

 

•  This mode let you lock the disc tray. When this mode is

activated, the disc tray will not open when [Z  OPEN/
CLOSE] button or [EX-CHANGE] button is pressed. The 
message “LOCKED” will be displayed on the fl uorescent
indicator tube. This mode only applied when there is disc(s)
on the tray.

 • 

Procedure:

 

  1.  Press [POWER] button to turn on the system.

 

  2.  Select CD function.

 

 3.  Press [STOP] button and [ENTER] button si-

multaneously 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 [POWER] button to turn on the system.

 

 2.  Press [TV] button and [FUNCTION] button 

simultaneously and hold for 3 seconds, message
“FACTORY” appears on the fl uorescent indicator 
tube. The function is changed to TUNER automati-
cally.

 

•  This mode is used to display the total count of meter 

pointer touch initial switch and max switch.

 • 

Procedure:

 

  1.  Press [POWER] button to turn on the system.

 

  2.  Select CD function and All DISC play mode.

 

  3.  Put discs on all trays and close the tray.

  

4. 

Press 

[B ??] button and [EXCHANGE] button

simultaneously for 3 seconds.

  

5. 

The 

fl uorescent indicator tube displays Aging 

Display “AG xxxx/yyyy”.

 

   

“xxxx” represents the error counter

 

   

(Maximum Value of “xxxx” = 9999)

 

   

“yyyyy” represents the cycle counter

 

   

(Maximum Value of “yyyy” = 9999)

 

6. 

Press [<<] or [>>] to search for Aging History 
Error Display.

 

   

The fl uorescent indicator tube displays “Mx E1E2E3E4”.

 

   

x: error history number

 

   

E1: Loading sequence JCP high

 

   

E2: Loading sequence JCP low

 

   

E3: Loading operation JCP

 

   

E4: Cam position operation JCP

 

  7.  Press [ENTER] to Aging Display.

 

•  To release from CDM Aging Mode.

 

  To release from this mode, press [POWER] button or 

perform COLD RESET operation.

Procedure:
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 

: 75 kHz

Modulation 

: 1 kHz

ANT input 

: 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. Confi rm 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”.

0 dB = 1 μV