DOWNLOAD Sony HCD-GT22 / HCD-GT44 / HCD-GT55 / MHC-GT22 / MHC-GT22BP / MHC-GT44 / MHC-GT44BP / MHC-GT55 / MHC-GT55BP Service Manual ↓ Size: 5.41 MB | Pages: 98 in PDF or view online for FREE

13

4

two coil springs 
(insulator)

7

two coil springs 
(insulator)

5

two insulators 

8

two insulators 

6

two floating screws
(PTPWH M2.6)

2

holder (213) assy or holder (KSM) assy

0

Remove the four solders of motor.

qa

flexible flat cable (16 core)
(CN301)

qs

CD board

qd

optical pick-up block
(KSM-213D)

1

floating screw 
(PTPWH M2.6)

3

two floating screws
(PTPWH M2.6)

9

2

tray

3

belt (table)

5

pulley (table)

8

screw
(BTTP (M2.6))

0

SENSOR board

7

gear (geneva)

9

connector
(CN731)

1

floating screw 
(PTPWH M2.6)

6

floating screw 
(PTPWH M2.6)

4

floating screw 
(PTPWH M2.6)

14

6

Remove the two solderings of motor.

8

MOTOR (TB) board

7

table motor assy (M741)

5

two screws
(BTTP (M2.6))

4

3

wire (flat type) (5 core) (CN742)

1

stopper

2

stopper

3

Remove the two solderings of motor.

5

MOTOR (LD) board

1

belt (loading)

4

loading motor assy (M751)

2

two screws
(BTTP (M2.6))

15

This mode is used to display the parameter of amplifier IC and
display the VACS status.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press three buttons of

x

,  

u

  and [USB] simultaneously.

3. When the AMP test mode is activated, the message “AMP

TEST IN” is displayed on the fluorescent indicator tube
momentarily, then amplifier adjustment mode is displayed on
the fluorescent indicator tube.

4. Press the [TAPE REC PAUSE/START] button to changed over

between VACS status display mode and the amplifier IC
parameter display mode.

5. In this mode, press the [GROOVE]  button to changed over

DBFB on/off, and “DBFB ON” or “DBFB OFF” is displayed
on the fluorescent indicator tube.

6. In this mode, press the [SURROUND] button to changed over

surround on/off, and “SURROUND ON” or “SURROUND
OFF” is displayed on the fluorescent indicator tube.

−

 For GT22/GT44 

−

7. In this mode, press the [EQ BAND] button to enter the equalizer

adjustment mode.
In the equalizer adjustment mode, press the [EQ BAND] button
to change over the adjustment band as LOW/MID/HIGH. And
turn the [OPERATION DIAL] knob to adjust the equalizer level
of each bands.

−

 For GT55 

−

7. In this mode, press the [BASS], [VOCAL] or [GUITAR] button

to enter the parametric equalizer adjustment mode.
In the parametric equalizer adjustment mode, press the [BASS],
[VOCAL] and [GUITAR] button to change over the adjustment
band. And press the [BASS], [VOCAL] or [GUITAR] button to
change over the equalizer frequency of each bands, or press
the  [+]  and [--]  buttons to adjust the equalizer level of each
bands.

8. To release the amplifier IC parameter display mode or equalizer

adjustment mode, press the

I

/1

button to the power off.

This mode is used to check operations of microprocessor.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press three buttons of

x

,  

u

  and [AUDIO] simultaneously.

3. When the MC test mode is activated, VACS level is displayed

on the fluorescent indicator tube momentarily.

4. Press the [TUNING +] button, the message “ALL EQ MAX”

is displayed on the fluorescent indicator tube momentarily
and press the [TUNING --] button, the message “ALL EQ MIN”
is displayed on the fluorescent indicator tube momentarily.

5. Press the [ENTER] button, the message “ALL EQ FLAT” is

displayed on the fluorescent indicator tube momentarily.

6. Turn the [VOLUME] knob clockwise, the message “VOLUME

MAX” is displayed on the fluorescent indicator tube
momentarily and turn the [VOLUME] knob counterclockwise,
the message “VOLUME MIN” is displayed on the fluorescent
indicator tube momentarily.

7. Press the [TAPE REC PAUSE/START] button to changed over

VACS on/off.

8. Press the

I

/1

button to release from this mode, then cold reset

is performed.

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 three buttons of

x

, 

u

  and [GROOVE] simultaneously.

2. The message “COLD RESET” is displayed on the fluorescent

indicator tube momentarily, then becomes standby states.

A step of AM tuning interval can be changed over between 9 kHz
and 10 kHz.
Procedure:

1. Press the

I

/1

button to turn the power on.

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

I

/1

button to turn the power off.

4. Press two buttons of [TUNING +] and

I

/1

 

 simultaneously.

5. The message “AM 9K STEP” or “AM 10K STEP” is displayed

on the fluorescent indicator tube, and thus the tuning interval
is changed over.

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 the

I

/1

button to turn the power on.

2. Press the [CD] button to select “CD”.
3. Press two buttons of  

u

 and

I

/1

simultaneously.

4. The message “LOCK” is displayed on the fluorescent indicator

tube, and the CD ship mode is set.

This mode is used to perform CD ship (lock) mode and cold reset
simultaneously.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press the [CD] button to select “CD”.
3. Press three buttons of

x

,  [ILLUMINATION]  and

I

/1

simultaneously.

4. The message “COLD RESET” is displayed on the fluorescent

indicator tube momentarily, then becomes standby states.

This mode is used to unable to take sample disc out of disc table in
the shop.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press the [CD] button to select “CD”.
3. Insert a disc.
4. Press two buttons of

x

and 

 

Z

  for 5 seconds.

5. The message “LOCKED” is displayed on the fluorescent

indicator tube and the disc table is locked. (Even if pressing
the

Z

button, the message “LOCKED” is displayed on the

fluorescent indicator tube and the disc table is locked)

6. To release this mode, press two buttons of

x

and

Z

for 5

seconds.

7. The message “UNLOCKED” is displayed on the fluorescent

indicator tube and the disc table is unlocked.

16

This mode is used to check the model, destination and software
version.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press three buttons of

x

, 

u 

  and  [ILLUMINATION]  simulta-

neously.

3. When this mode is activated, model type and destination (*1)

are displayed on the fluorescent indicator tube.

*1) GRL2H

: HCD-GT22

GRL2HS : HCD-GT44

GRL3HS : HCD-GT55

Example: GRL3HS_LATIN: Latin American models of HCD-GT55

4. Press the [TAPE REC PAUSE/START] button to display the soft-

ware version (*2) and year, month, day of the software cre-
ation.

*2) G**.*** : The version of system controller (IC901 on the MAIN

board).

M**.*** : The version of USB control module in the sysytem

controller.

U**.*** : The version of USB controller (IC901 on the USB

board).

5. To release this mode, press three buttons of

x

  , 

u

  and

[ILLUMINATIOM] simultaneously.

This mode can be used for error code display of CD section.
Procedure:

1. Press the

I

/1

button to turn the power on.

2. Press the [CD] button to select “CD”.
3. Press three buttons of

x

, [CD] and [SURROUND] simulta-

neously.

4. When this mode is activated, mechanism deck error code is

displayed on the fluorescent indicator tube.

5. Press the [ENTER]  button to changed over between optical

pick-up error code display mode and mechanism deck error
code mode.

There are two

[ENTER]

buttons on the HCD-GT55, but it works in

the same way whichever button is pressed.

6. Press the [TUNING +]/[TUNING ---] button to change over dis-

play of  error history number.

7. To release this mode, press the

I

/1

button to turn the power

off.

When this mode is entered, mechanism deck error code is displayed
with the 10-character format on the fluorescent indicator tube.

The first digit from the left indicates:
The first digit from the left indicates which mode the error history
is. In the mechanism deck error code mode, “M” is displayed on
the fluorescent indicator tube.

The second digit from the left indicates:
(Error history number display)
The second digit from the left indicates which order the error history
is. “0” indicates the latest error history, and each time the number
increases by one, the error history goes back to one-previous error.

The third and 4th digit from the left indicates:
(Error status display)
The third and 4th digit from the left indicates which error status is
indicated.

Display

Status

0

0

No error

0

8

Table operation time-out (Table does not move to the target

position within the specified time)

1

6

In the chucking down operation, the operation was retried

by the maximum number of times but the operation could

not be completed

1

7

In the chucking up and down operation, the reverse

recovery processing was attempted but it could not be

recovered

1

8

In the chucking up operation, the operation was retried by

the maximum number of times but the operation could not

be completed

2

0

Loading operation time-out (Table does not move to the

target position within the specified time)

2

2

As the chuck was in the ex-open status at the initialization,

the closing was attempted but could not be completed

The 5th and 6th digit from the left indicates:
(Present status display)
The 5th and 6th digit from the left indicates which operating status
when an error occurred is indicated.

Display

Status

0

1

Open completion status

0

2

From open status, the movement to chucking down position

is under way

0

3

From chucking down position, the open operation is under

way

0

4

Chucking down completion status

1

0

The chucking down operation is under way

1

1

The chucking up operation is under way

1

2

Close completion status

1

3

From close status, the ex-open operation is under way

1

4

From ex-open status, the close operation is under way

1

8

Ex-pen completion status

The 7th and 8th digit from the left indicates:
(Motor status display)
The 7th and 8th digit from the left indicates which motor output
status when an error occurred is indicated.

Display

Status

×

0

No table motor output

×

1

Table motor forward output

×

2

Table motor backward output

×

3

Table motor break output

0

×

No loading motor output

1

×

Loading motor forward output

2

×

Loading motor backward output

3

×

Loading motor break output