DOWNLOAD Sony HCD-GX750 / HCD-RG551 / HCD-RX550 / MHC-GX750 / MHC-RG551S Service Manual ↓ Size: 7.53 MB | Pages: 76 in PDF or view online for FREE

Model
HCD-GX750 HCD-RG551 HCD-RX550 MHC-GX750 MHC-RG551S
Pages
76
Size
7.53 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-gx750-hcd-rg551-hcd-rx550-mhc-gx750-mhc-rg551s.pdf
Date

Sony HCD-GX750 / HCD-RG551 / HCD-RX550 / MHC-GX750 / MHC-RG551S Service Manual ▷ View online

17
HCD-GX750/RG551/RX550
3-16. SENSOR BOARD
3-15. OPTICAL PICK-UP
6
two coil springs 
     (insulator)
0
two coil springs 
     (insulator)
7
two insulators 
qa
two insulators 
8
two screws 
     (BVTT M2.6)
4
screw 
     (BVTT M2.6)
2
holder (213) ASSY
9
two stoppers (BU)
5
stopper (BU)
qd
optical pick-up
     (KSM-215DCP/C2NP)
3
floating screw
     (+PTPWH M2.6)
qs
1
floating screw 
     (+PTPWH M2.6)
2
tray
3
belt (table)
5
pulley (table)
8
screw
     (+BTTP (M2.6))
0
SENSOR board
7
gear (geneva)
1
floating screw 
     (+PTPWH M2.6)
6
floating screw 
     (+PTPWH M2.6)
4
floating screw 
     (+PTPWH M2.6)
9
CN731
18
HCD-GX750/RG551/RX550
3-18. MOTOR (LD) BOARD
3-17. MOTOR (TB) BOARD
6
Remove the two solderings of motor.
8
MOTOR (TB) board
7
table motor assy (M741)
5
two screws
     (+BTTP (M2.6))
4
1
stopper
2
stopper
3
CN742
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))
19
HCD-GX750/RG551/RX550
SECTION 4
TEST MODE
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
• A step of AM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “TUNER”, and press  TUNER/BAND
button to select the BAND “AM”.
3. Press ?/1 button to turn the set OFF.
4. Press  TUNER/BAND  and ?/1 buttons simultaneously, and
the display of  fluorescent indicator tube changes to “AM 9 k
STEP” or “AM 10 k STEP”, and thus the channel step is changed
over.
[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 three buttons x  ,  PLAY MODE/TUNING MODE  ,
and DISC 1 simultaneously.
2. The fluorescent indicator tube displays “COLD RESET” and
the set is reset.
[Aging Mode]
This mode can be used for operation check of CD section and tape
deck section.
• If an error occurred:
The aging operation stops and is displayed status.
• If no error occurs:
The aging operation continues repeatedly.
1.
Operating method of Aging Mode
Turn on the main power and select “CD” of the function.
1) Set three discs in tray.  Select ALL DISCS, and REPEAT OFF.
2) Load the tapes recording use into both decks.
3) Press three buttons x ,  PLAY MODE/TUNING MODE  ,
and  EX-CHANGE  simultaneously.
4) Aging operations of CD and tape are started at the same time.
5) To exit the aging mode, perform [Cold Reset].
2.
Aging mode in CD section
1) Operation during aging mode
• In the agining mode, the program is excuted in the following
sequence.
(1) The disc tray opens and closes.
(2) The disc tray turns to select a disc 3.
(3) The pick-up accesses to the first track, and plays 3 seconds.
(4) The pick-up accesses to the last track, and plays 3 seconds.
(5) The disc tray opens and closes.
(6) The disc tray turns to select a disc 1.
(7) The same operation starts like step (3).
(8) After a disc 1 aging operation, a disc 2 is selected.
(9) When an aging operation of a disc 3 is completed, the display
“AGING 
∗∗∗∗
” value increases.
(10) If no error occurs, the aging operation continues repeatedly.
2) Error display
Step
1
2
3
4
5
6
7
8
9
10
11
12
Operation
Rewind the TAPE A
Rewind the TAPE B
Play the TAPE A (1 minute)
Stop the TAPE A (1 second)
Play the TAPE A (3 minutes)
Rewind(AMS) the TAPE A
F.F.(AMS) the TAPE A
Play the TAPE B (1 minute)
Stop the TAPE B (1 second)
Record the TAPE B (3 minutes)
Rewind(AMS) the TAPE B
F.F.(AMS) the TAPE B
Display
TAPE
AAG-1
TAPE
BAG-2
TAPE
AAG-2
TAPE
AAG-3
TAPE
AAG-4
TAPE
AAG-5
TAPE
AAG-6
TAPE
BAG-2
TAPE
BAG-3
TAPE
BAG-4
TAPE
BAG-5
TAPE
BAG-6
Disc error
Display
Error
E00D01022
Focus error (No disc)
E00D02022
Sub Q error (Focus is good)
E00D02023
TOC reading error
E00D02014
Access error (Unable within regular time)
Mechanism error
Display
Error
E00M__E_0
Error during opening tray
E00M__C_2
EX-CHANGE disc error
E00M__D_0
Error during closing tray
E00M__F_3
EX-OPEN error
E00M__D_5
EX-CLOSE error
E00M__C_2
Chuck-up error
E00M__C_3
Unchucking error
3.
Aging mode in Tape Deck section
1) Operation during aging mode
• In the agining mode, the program is excuted in the following
sequence.
2) Error display
• If error occurred, the display remains like “TAPE BAG-2”.
4.
Exiting from the aging mode
• Be sure to perform Cold Reset to exit from the aging mode.
20
HCD-GX750/RG551/RX550
[MC Test Mode]
• This mode is used to test the function of the equalizer.
Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  PLAY
MODE/TUNING MODE  and  DISC 3  simultaneously.
3. Press the  EQ +  button.
The function of the equalizer is set to “MIN”.
4. Press the  EQ –  button.
The function of the equalizer is set to “MAX”.
5. Press the  PRESET EQ  button.
The function of the equalizer is set to “EQ FLAT”.
6. MASTER VOLUME  up and down.
“VOLUME MIN” “VOLUME 16” “VOLUME MAX” is
displayed.
7. Press the  GROOVE  button.
The message “VACS OFF” or “VACS ON” is displayed.
8. To exit from this mode, press  ?/1  button to turn the set OFF.
[CD Ship Mode (LOCK) ]
• This mode moves the pick-up to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. Press  ?/1  button to turn the set OFF.
4. Press  CD  button and  ?/1   button simultaneously.
5. The “STANDBY” display blinks instantaneously, and the CD
ship mode is set.
[CD Ship (LOCK) & COLD RESET MODE]
Procedure:
1.
Press  ?/1  button to turn the set ON.
2.
Select the function “CD”.
3.
Press  ?/1  button to turn the set OFF.
4.
Press three buttons  x  ,  CD  and  DISPLAY  simultaneously.
5.
The “STANDBY” display blinks instantaneously and CD ship
mode is set.
6.
To fluorescent indicator tube displays “COLD RESET” and
the set is reset.
[Disc Tray Lock]
Procedure:
1.
Press the  ?/1  button to turn the set ON.
2.
Press two buttons of  x  and  Z  simultaneously for five seconds.
3.
The message “LOCKED” is displayed and the tray is locked.
(Even if exiting from this mode, the tray is still locked.)
4.
Press two buttons of  x  and  Z  simultaneously for five seconds
again.
5.
The message “UNLOCKED” is displayed and the tray is
unlocked.
6.
To exit from this mode, press the  ?/1  button to turn the set
OFF.
[PANEL  Test Mode]
• All fluorecent segments and LEDs are tested.
• Keyboard check.
Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  PLAY
MODE/TUNING MODE  and  ENTER  simultaneously.
3. All segments and LEDs (without STANDBY LED) are turned
on.
4. Press  X  and  ENTER  buttons simultaneously, and the key
check mode is activated.
5. The message “KEY 0 0 0 ” is displayed.
Each time a button is pressed, the key code number is displayed.
6. Press  X  and  ENTER  buttons simultaneously, and the key
count mode is activated.
7. The message “KEYCNT 0” is displayed.
Each time a button is pressed, “KEYCNT 0” value increased.
However, once a button is pressed, it is no longer taken into
account.
8. Press  X  and  ENTER  buttons simultaneously, and the head
phone detect mode is activated.
9. The message “H_P OFF” is displayed when a headphone jack
is not inserted.
“H_P ON ” is displayed when a headphone jack is inserted.
10. Press  X  and  ENTER  buttons simultaneously, and the volume
control detect mode is activated.
11. The message “VOLUME FLAT” is displayed.
“VOLUME UP” is displayed if rotating  MASTER VOLUME
knob clockwise, or “VOLUME DOWN” is displayed if rotating
counterclockwise.
12. To exit from the GC test mode after the head phone detect mode,
press  X  and  ENTER  buttons simultaneously.
[Version and Destination Display Mode]
• The version or destination is displayed.
Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  PLAY
MODE/TUNING MODE  and  DISC 2  simultaneously.
3. The destination is displayed.
4. Press  DISPLAY  buttons simultaneously.
5. The version is displayed.
6. To exit from this mode, press  ?/1  button to turn the set OFF.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pick-up.
Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. To enter the test mode, press three buttons x ,  PLAY MODE/
TUNING MODE  , and  Z  simultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, press   M
 
  button  to move the
pick-up to outside track, or press  m
 
 button to inside track.
6. To exit from this mode, perform as follows:
1) Move the pick-up to the most inside track.
2) Press  ?/1  button to turn the set OFF.
Note:
 • Always move the pick-up to most inside track when exiting from
this mode.  Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
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