DOWNLOAD Sony HCD-GPX33 / HCD-GPX55 / HCD-GPX77 / HCD-GPX88 Service Manual ↓ Size: 6.32 MB | Pages: 82 in PDF or view online for FREE

[PANEL TEST MODE]
This mode is used to check the fl uorescent indicator tube, LEDs, 
keys, [MASTER VOLUME / DJ CONTROL] jog, model, destina-
tion and software version.

1.  Press [ENTER] and [MUSIC] button simultaneously and hold 

3 seconds.

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

ed up. All RGB LEDs are lighted up in white color.

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

press [+

] button.

 

The model information appears on the fl uorescent  indicator 
tube.

 

• 

“GSX3” is shown for XXX-GPX33.

 

• 

“GSX5” is shown for XXX-GPX55.

 

• 

“GSX7” is shown for XXX-GPX77.

 

• 

“GSX8” is shown for XXX-GPX88.

 

** If display shown information below, please proceed with 
[MODEL & DEST WRITE MODE] to write model & destina-
tion.

 

• 

“GSX8(T)” is shown for XXX-GPX33/55/77/88.

 

 

XXX = MHC / LBT

 Press 

[+

] button again to view the destination information.

4.  During the destination information display, press [+

] button. 

Each time [+

] button is pressed, the fl uorescent indicator 

tube shows the version of each category software in the follow-
ing sequence: SC, MTK, UI, PF, SYS, CD, CDMA, CDMB, 
ST, TA, TAS, TM, BTM, BT, NFC, and return back to model 
information display.

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

are being displayed except model and destination, the 
date of the software creation appears. When [] button 
is pressed again, the display returns to the software ver-
sion display.

6. Press 

[-

] 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 / DJ CONTROL] knob is 
turned clockwise, or it decreases in the manner of 0, 
9, 8, 7... if [MASTER VOLUME / DJ CONTROL] 
knob is turned counterclockwise.

8.  When [ENTER] 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, all RGB 
LEDs would light up in red color. If you press [ENTER] 
button again, another half of alternate segments in fl uorescent 
indicator tube and LEDs would light up, all RGB LEDs would 
light up in green color. Pressing [ENTER] button again would 
cause all segments in fl uorescent indicator tube and LEDs 
light up, all RGB LEDs would light up in blue color. Pressing 
[ENTER] button again would turn off all segments in fl uores-
cent indicator tube and all LEDs including RGB LEDs.

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

manner as step 1, or disconnect the power cord.

This mode is used to set software model & destination.

This mode is only available when no permanent model & destina-

tion is stored.

1.  Press [ENTER] and [FOOTBALL] button simultaneously and 

hold for 5 seconds.

2.  Fluorescent indicator tube display will show “M XXXXX”.
3. Press [+

 or -] button to select the model based on the 

set’s model.

XXX-GPX33

“M GSX3”

XXX-GPX55

“M GSX5”

XXX-GPX77

“M GSX7”

XXX-GPX88

“M GSX8”

 

 

XXX = MHC / LBT

4.  Press [ENTER] button.
5.  Fluorescent indicator tube display will show “D XXXXX”.
6. Press 

[+

 or -] button to select the destination based on 

the set’s country.

J1

Japan

“D J”

JE1

Tourist

“D JE”

U2/CA2

America, Canada

“D NA”

CEL/CE1/
CE2

Europe (general)

“D CE2”

CEK

U.K.

“D CEK”

RU1/RU3

Russia

“D RU”

AU1

Australia

“D AU”

CN1

China

“D CN”

E12

India, Pakistan, Morocco

“D E12”

E3/E93/
SA2/E15

Middle East, Africa 
(South Africa), Iran

“D E3”

E4

Africa

“D E12”

EA3

Saudi Arabia

“D EA3”

HK1/
HK2/PL1/
SP1/SP2/
SP6/TH1

Hong Kong, Philippines, 
Singapore, Malaysia, 
Thailand

“D ASIA”

KR2

Korea

“D KR”

TW2

Taiwan

“D TW”

E2, E32, 
E51, AR2

Latin America (general), 
Chile, Peru, Argentina

“D LATIN”

BR1

Brazil

“D BR”

MX2, 
MX4

Mexico

“D MX”

7.  Press [ENTER] button to confi rm the selection.
8.  “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.

9.  Perform [PANEL TEST MODE] again to confi rm on the 

model & destination.

[USER RESET]
The user reset clears all data including preset data stored in the data 
fl ash to initial conditions exclude history mode data.

1. Press 

[

\/1

 / STANDBY] button to turn on the system.

2. Press [] and [LED COLOR] button simultaneously for 3 

seconds.

3.  “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.

[COLD RESET]
The cold reset clears all data including preset data stored in the 
data fl ash to initial conditions included history mode data. Execute 
this mode when returning the set to the customer.

1. Press 

[

\/1

 / STANDBY] button to turn on the system.

2. Press [] and [AUDIO IN] 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.

[CD SHIP MODE (WITH MEMORY CLEAR)]
This mode moves the optical pick-up to the position durable to 
vibration and clears all data including preset data stored in the data 
fl ash to initial conditions during the next AC-In. Use this mode 
when returning the set to the customer after repair.

1. Press 

[

\/1

 / STANDBY] button to turn on the system.

2.  Select CD function.
3.  Press [CD] and [SOUND FLASH] button simultaneously for 3 

seconds. The system turns off automatically.

4.  “MECHA LOCK” is displayed on the fl uorescent  indicator 

tube and the CD ship mode is set.

[CD TRAY LOCK MODE]
This mode let you lock the disc tray. When this mode is activated,
the disc tray will not open when [Z OPEN/CLOSE] button is
pressed. The message “LOCKED” will be displayed on the fl uo-
rescent indicator tube. This mode only applied when there is disc 
on the tray.

1. Press 

[

\/1

 / STANDBY] button to turn on the system.

2.  Select CD function.
3. Press 

[] and [ENTER] button simultaneously and hold down 

until “LOCKED” or “UNLOCKED” displayed on the fl uores-
cent indicator tube (around 5 seconds).

[CDM AGING MODE]
This mode is used for CDM aging.

1. Press 

[

\/1

 / STANDBY] button to turn on the system.

2.  Select CD function.
3.  Open the disc tray, insert a disc and close the tray.
4.  Press [CD] and [BASS BAZUCA] 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)

 

 

“yyyy” 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 this mode, press [

\/1

 / STANDBY] button.

[HISTORY MODE]
This mode is used to check important data stored in the system 
when PROTECTOR happen.

1.  During demo mode, press [ENTER] and [LED PATTERN] for 

5 seconds to mode in to history mode.

2.  Press the [



 .m / TUNING-] or [M > 



/ TUNING+]

button to check history data stored.

To release from this mode, press [

\/1

 / STANDBY] button.

[PROTECT KIND CHECK TEST MODE]
This mode is used to check types of protect occurred during 
protector on.

1.  During protection on, fl uorescent indicator tube shows blinking

message “PROTECT EXX” where “EXX” represent the error 
code.

2. Press 

[] and [-

] button simultaneously.

3. Fluorescent indicator tube display will toggle between 

“PROTECT” message and protector kind message display.

 

Below table explains on protector kind.

E01

“AMP OCP”

The over current condition to 
MOSFET occurs by defect of 
MOSFET or defect of PS output 
line.

E03

“POWER 
SUPPLY”

Defect of power supply circuit 
to AMP

E04

“DC DETECT”

DC appears in SP terminal by 
defect of AMP IC and MOS-
FET.

E05

“THERMISTOR”

Unusual heat up of MOSFET by 
improper assembly of heat sink, 
destruction of MOSFET etc.

E06

“FAN BLOCK”

Defect of DC FAN and DC FAN 
driver circuit

To release from this mode:
Press [] and [-

] button simultaneously again or unplug & 

re-plug in the power cord.

RESET defect

Reset signal status from micom is not ‘H’.

P

R

O

C

O

U

N

T

※ ※

Protector Count

P

R

O

T

Y

P

E

※ ※ ※ ※

Protector Type (refer PROTECTOR KIND CHECK TEST MODE)

Protector type

Protector Error Code

AMPL

E01

PWR2

E03

SPK

E04

TEMP

E05

FAN

E06

T

1

※ ※ ※ ※ ※

H

※ ※

M

Single Power On Time

T

2

※ ※ ※ ※ ※

H

※ ※

M

Total Power On Time

F

U

N

C

※ ※ ※ ※ ※ ※ ※

Input Function

V

O

L

※ ※ ※

Volume

A

T

T

※ ※ ※

Actual Attenuation

E

Q

L

O

W

※ ※ ※

Low EQ Level

E

Q

M

I

D

※ ※ ※

Mid EQ Level

E

Q

H

I

G

H

※ ※ ※

High EQ Level

V

A

C

S

※ ※

VACS Level

A

P

V

A

C

S

※ ※

AP VACS Level

S

W

※ ※ ※

Subwoofer Setting

S

U

R

R

※ ※ ※

Surround Setting

D

J

※ ※ ※ ※ ※ ※

※ ※

DJ Effect Setting

B

A

Z

U

C

A

※ ※ ※

Bass Bazuca Setting

Note:
1.  CD Block is basically constructed to operate without adjustment.
2.  Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-

ed.

3.  Use an oscilloscope with more than 10 MΩ impedance.
4.  Clean the object lens by an applicator with neutral detergent when the
 

signal level is low than specifi ed value with the following checks.

5.  Check the focus bias check when optical pick-up block is replaced.

Procedure :
1.  Connect the oscilloscope to CL574 (RFMON) and
 

CN509 pin 3 (GND) on the MB board.

2. Press the [

?/1 

STANDBY] button to turn the power on, and 

press the [CD] button to select CD function.

3.  Set disc (YEDS-18) and press the [u] button to playback.
4. Confi rm that oscilloscope waveform is as shown in the fi gure
 

below (eye pattern).

 

A good eye pattern means that the diamond shape (

) in the

center of the waveform can be clearly distinguished.

Procedure:
1.  Turn the power on.
2.  Input the following signal from Signal Generator to FM an-

tenna 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

CN509

CN110

CL574

pin 3 (GND)

(RFMON)