Sony HCD-GX255 / HCD-RG170 / HCD-RG470 / MHC-GX255 / MHC-RG170 / MHC-RG470 Service Manual ▷ View online
13
HCD-GX255/RG170/RG470
3-11. OPTICAL PICK-UP BLOCK (KSM-215DCP)
3-10. DRIVER BOARD, SW BOARD
3
connector
4p (CN703)
4
DRIVER board
6
SW board
2
wire (flat type) 5p (CN702)
1
two screws
(+BTTP (M2.6))
5
screw
(+BTTP (M2.6))
4
two coil springs
(insulator)
7
two coil springs
(insulator)
5
two insulators
8
two insulators
0
screw (+BVTP 2.6
×
8)
qa
gap tube
6
two floating screws
(+PTPWH M2.6)
2
holder (213) ASSY
qs
Remove the four solders of motor.
qd
wire (flat type)
(CN101)
(CN101)
qf
BD board (MX)/
CD board (except MX)
CD board (except MX)
qg
optical pick-up block
(KSM-215DCP)
1
floating screw
(+PTPWH M2.6)
3
two floating screws
(+PTPWH M2.6)
9
•
Abbreviation
MX : Mexican model
MX : Mexican model
14
HCD-GX255/RG170/RG470
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)
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
3-12. SENSOR BOARD
3-13. MOTOR (TB) BOARD
15
HCD-GX255/RG170/RG470
4
Remove the two solderings of motor.
3
MOTOR (LD) board
1
belt (loading)
5
loading motor assy (M751)
2
two screws
(+BTTP (M2.6))
3-14. MOTOR (LD) BOARD
16
HCD-GX255/RG170/RG470
SECTION 4
TEST MODE
MC 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:
RAM to initial conditions. Execute this mode when returning the
set to the customer.
Procedure:
1. Press three buttons of
x
, [ILLUMINATION] and [DISC 1]
simultane-ously.
2. The message “COLD RESET” is displayed on the fluorescent
indicator tube momentarily, then becomes standby states.
AM TUNING INTERVAL CHANGE-OVER
(Except AEP, East European, Russian model)
(Except AEP, East European, Russian model)
A step of AM tuning interval can be changed over between 9 kHz
and 10 kHz.
Procedure:
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
3. Press the
I
/1
button to turn the power off.
4. Press two buttons of [PLAY MODE/TUNING MODE] and
I
/1
simultaneously.
5. The message “AM 9K STEP” or “AM 10K STEP” is displayed
on the fluorescent indicator tube, and thus the channel step is
changed over.
changed over.
CD SHIP (LOCK) MODE
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:
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 [CD] and [POWER] simultaneously.
4. The message “LOCK” is displayed on the fluorescent indicator
3. Press two buttons of [CD] and [POWER] simultaneously.
4. The message “LOCK” is displayed on the fluorescent indicator
tube, and the CD ship mode is set.
CD SHIP (LOCK) MODE & COLD RESET
This mode is used to perform CD chip (lock) mode and cold reset
simultaneously.
Procedure:
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
3. Press three buttons of
x
, [CD] and [DISPLAY] simultaneously.
4. The message “COLD RESET” is displayed on the fluorescent
indicator tube momentarily, then becomes standby states.
CD TRAY LOCK MODE
This mode is used to unable to take sample disc out of tray in the
shop.
Procedure:
shop.
Procedure:
1. Press the
I
/1
button to turn the power on.
2. Press the [CD] button to select “CD”.
3. Load a disc and press two buttons of
3. Load a disc and press two buttons of
x
and
Z
for 5 seconds.
4. The message “LOCKED” is displayed on the fluorescent
indicator tube and the CD tray is locked. (Even if pressing
the
the
Z
button, the message “LOCKED” is displayed on the
fluorescent indicator tube and the CD tray is locked)
5. To release this mode, press two buttons of
x
and
Z
for 5
seconds.
6. The message “UNLOCKED” is displayed on the fluorescent
indicator tube and the CD tray is unlocked.
AMP TEST MODE
This mode is used to display the parameter of amplifier IC and
display the VACS status.
Procedure:
display the VACS status.
Procedure:
1. Press the
I
/1
button to turn the power on.
2. Press three buttons of
x
, [ILLUMINATION] and [PRESET EQ]
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.
momentarily, then amplifier adjustment mode is displayed on
the fluorescent indicator tube.
4. Press the [DISPLAY] button to changed over between VACS
status display mode and the amplifier IC parameter display
mode.
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.
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.
OFF” is displayed on the fluorescent indicator tube.
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 [ --- EQ + ]
turn the [ --- EQ + ]
L
l
knob 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.
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