Sony DHC-MD777 / HMC-MD777 Service Manual ▷ View online
– 3 –
Items of Error History Mode Items and Contents
Display
Details of History
0π E00
No error
0π E01
Disc error. PTOC cannot be read
(DISC ejected)
0π E02
Disc error. UTOC error
(DISC not ejected)
0π E03
Loading error
0π E04
Address cannot be read (Servo has deviated)
Table of Error Codes
Error Code
Error Code
Details of Error
total rec
Displays the recording time.
Displayed as “rππππππh”.
The displayed time is the total time the laser is set to the high power state.
This is about 1/4 of the actual recording time.
The time is displayed in decimal digits from 0h to 65535h.
Displayed as “rππππππh”.
The displayed time is the total time the laser is set to the high power state.
This is about 1/4 of the actual recording time.
The time is displayed in decimal digits from 0h to 65535h.
total play
Displays the play time.
Displayed as “pππππππh”. The time displayed is the total actual play time. Pauses are not counted.
The time is displayed in decimal digits from 0h to 65535h.
Displayed as “pππππππh”. The time displayed is the total actual play time. Pauses are not counted.
The time is displayed in decimal digits from 0h to 65535h.
retry err
Displays the total number of retries during recording and number of retry errors during play.
Displayed as “rππ pππ”.
“r” indicates the retries during recording while “p” indicates the retry errors during play.
The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF.
Displayed as “rππ pππ”.
“r” indicates the retries during recording while “p” indicates the retry errors during play.
The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF.
total err
Displays the total number of errors.
Displayed as “total ππ”.
The number of errors is displayed in hexadecimal digits from 00 to FF.
Displayed as “total ππ”.
The number of errors is displayed in hexadecimal digits from 00 to FF.
err history
Displays the 10 latest errors.
Displayed as “0π E@@”.
π indicates the history number. The smaller the number, the more recent is the error. (00 is the latest).
@@ indicates the error code.
Refer to the following table for the details. The error history can be switched by turning the
Displayed as “0π E@@”.
π indicates the history number. The smaller the number, the more recent is the error. (00 is the latest).
@@ indicates the error code.
Refer to the following table for the details. The error history can be switched by turning the
≠ ˜ ± dial.
er refresh (*1)
Mode which erases the “retry err”, “total err”, and “err history” histories
When returning the unit to the customer after completing repairs, perform this to erase the past error history.
After pressing the
When returning the unit to the customer after completing repairs, perform this to erase the past error history.
After pressing the
[MD WALKMAN SYNC]
button and “er refresh?” is displayed, press the
[ENTER/YES]
button
to erase the history.
“Complete!” will be displayed momentarily.
Be sure to check the following when this mode has been executed.
• The data has been erased.
• The mechanism operates normally when recording and play are performed.
“Complete!” will be displayed momentarily.
Be sure to check the following when this mode has been executed.
• The data has been erased.
• The mechanism operates normally when recording and play are performed.
tm refresh (*1)
Mode which erases the “total rec” and “total play” histories.
These histories serve as approximate indications of when to replace the optical pickup.
If the optical pickup has been replaced, perform this operation and erase the history.
After pressing the
These histories serve as approximate indications of when to replace the optical pickup.
If the optical pickup has been replaced, perform this operation and erase the history.
After pressing the
[MD WALKMAN SYNC]
button and “tm refresh?” is displayed, press the
[ENTER/YES]
button
to erase the history.
“Complete!” will be displayed momentarily.
Be sure to check the following when this mode has been executed.
• The data has been erased.
• The mechanism operates normally when recording and play are performed.
“Complete!” will be displayed momentarily.
Be sure to check the following when this mode has been executed.
• The data has been erased.
• The mechanism operates normally when recording and play are performed.
0π E05
FOK has deviated
0π E06
Cannot focus (Servo has deviated)
0π E07
Recording retry
0π E08
Recording retry error
0π E09
Playback retry error
(Access error)
0π E0A
Playback retry error
Details of Error
(*1) If “err refresh” or “tm refresh” is performed, the error history data are all erased. Only when “OP Replacement” was executed,
perform this operation to clear the error history data, otherwise, never perform this operation.
– 4 –
CD SECTION
OPERATING THE DISPLAYED HISTORIES
1. Press the
[PLAY MODE]
and
[REPEAT]
button simulta-
neously, and the count of mechanical error and “NO DISC”
that optical system judged are displyed.
that optical system judged are displyed.
(*1) Mechanical error code
Emc=
Count of mechanical error
Count of “NO DISC”
**
Edc=
**
2. Under this condition press the buttons in Table 1, and the re-
spective operations are executed as listed below.
Table 1.
Button
Function
CD 1
Mechanical error cord from latest one to last ten are dis-
played each time this button is pressed. (*1)
played each time this button is pressed. (*1)
CD 2
The reasons of “NO DISC” from latest one to last ten are
displayed each time this button is pressed. (*2)
displayed each time this button is pressed. (*2)
§ (CD1)
Reset the count of mechanical error.
§ (CD2)
Reset the count of “NO DISC”.
E
**
M
** ** ** ** **
(a)
(b)
(c)
(d)
(e)
(f)
E
**
D
** ** **
(a)
(b)
(c)
(d)
(*2) NO DISC error code
(a)
The number of Mechanical error.
Latest one “00” to last ten “09”
(Turn the
Latest one “00” to last ten “09”
(Turn the
≠
↔
± dial and change the error No.)
(b)
“FF”
: Mechanical error, when mechanical initialize to
completion.
(c)
“1
*
”
: Mechanical error in the midst of sub tray loading
“2
*
”
from the stocker.
(d)
“
**
” : Don’t care. (not used in servicing)
(e)
“2
*
”
: Mechanical error in the midst of the stocker up/
down.
(f)
“2
*
”
: Mechanical error of the clamper or in the midst of
changing the mode.
(a)
The number of NO DISC error.
Latest one “00” to last ten “09”
(Turn the
Latest one “00” to last ten “09”
(Turn the
≠
↔
± dial and change the error No.)
(b)
“01”: Focus error
“02”: GFS error
“03”: Set up error
“02”: GFS error
“03”: Set up error
(c)
“00”: NO DISC error (Did not chucking retry)
“02”: NO DISC error (Chucking retry to completion)
“02”: NO DISC error (Chucking retry to completion)
(d)
The status, when judged NO DISC error.
“1
“1
*
” : Stop
“2
*
” : Set up
“3
*
” : TOC read
“4
*
” : Access
“5
*
” : Play
“6
*
” : Pause
“7
*
” : Manual search (Play)
“8
*
” : Manual search (Pause)
– 5 –
TABLE OF CONTENTS
SELF-DIAGNOSIS FUNCTION
....................................
2
1.
SERVICING NOTES
...............................................
6
2.
GENERAL
................................................................... 13
3.
DISASSEMBLY
......................................................... 15
4.
TEST MODE
.............................................................. 27
5.
ELECTRICAL ADJUSTMENTS
......................... 32
6.
DIAGRAMS
6-1. Block Diagram – CD SERVO Section – ....................... 41
6-2. Block Diagram – MD SERVO Section (1/2) – ............. 43
6-3. Block Diagram – MD SERVO Section (2/2) – ............. 45
6-4. Block Diagram
6-2. Block Diagram – MD SERVO Section (1/2) – ............. 43
6-3. Block Diagram – MD SERVO Section (2/2) – ............. 45
6-4. Block Diagram
– DISPLAY/POWER SUPPLY Section – ...................... 47
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 50
6-6. Printed Wiring Board – BD (CD) Section – .................. 51
6-7. Schematic Diagram – BD (CD) Section – .................... 53
6-8. Printed Wiring Boards
6-7. Schematic Diagram – BD (CD) Section – .................... 53
6-8. Printed Wiring Boards
– CD MOTOR/SENSOR Section – ................................ 55
6-9. Schematic Diagram
– CD MOTOR/SENSOR Section – ................................ 57
6-10. Schematic Diagram – BD (MD) Section (1/2) – ........... 59
6-11. Schematic Diagram – BD (MD) Section (2/2) – ........... 61
6-12. Printed Wiring Board – BD (MD) Section – ................. 63
6-13. Printed Wiring Boards
6-11. Schematic Diagram – BD (MD) Section (2/2) – ........... 61
6-12. Printed Wiring Board – BD (MD) Section – ................. 63
6-13. Printed Wiring Boards
– MD MOTOR/SENSOR Section – ............................... 67
6-14. Schematic Diagram
– MD MOTOR/SENSOR Section – ............................... 69
6-15. Printed Wiring Board
– MICROCOMPUTER Section – ................................... 71
6-16. Schematic Diagram
– MICROCOMPUTER Section – ................................... 73
6-17. Printed Wiring Boards – RELAY Section – .................. 75
6-18. Schematic Diagram – RELAY Section – ...................... 77
6-19. Printed Wiring Board – MAIN Section – ...................... 79
6-20. Schematic Diagram – MAIN Section – ......................... 81
6-21. Printed Wiring Boards – CD JOG/SW Section – .......... 83
6-22. Schematic Diagram – CD JOG/SW Section – .............. 85
6-23. Printed Wiring Board – CD DISPLAY Section – ......... 87
6-24. Schematic Diagram – CD DISPLAY Section – ............ 89
6-25. Printed Wiring Boards – MD JOG/SW Section – ......... 91
6-26. Schematic Diagram – MD JOG/SW Section – ............. 93
6-27. Printed Wiring Board – MD DISPLAY Section – ........ 95
6-28. Schematic Diagram – MD DISPLAY Section – ........... 97
6-29. IC Pin Function Description ......................................... 105
6-18. Schematic Diagram – RELAY Section – ...................... 77
6-19. Printed Wiring Board – MAIN Section – ...................... 79
6-20. Schematic Diagram – MAIN Section – ......................... 81
6-21. Printed Wiring Boards – CD JOG/SW Section – .......... 83
6-22. Schematic Diagram – CD JOG/SW Section – .............. 85
6-23. Printed Wiring Board – CD DISPLAY Section – ......... 87
6-24. Schematic Diagram – CD DISPLAY Section – ............ 89
6-25. Printed Wiring Boards – MD JOG/SW Section – ......... 91
6-26. Schematic Diagram – MD JOG/SW Section – ............. 93
6-27. Printed Wiring Board – MD DISPLAY Section – ........ 95
6-28. Schematic Diagram – MD DISPLAY Section – ........... 97
6-29. IC Pin Function Description ......................................... 105
7.
EXPLODED VIEWS
.............................................. 116
8.
ELECTRICAL PARTS LIST
............................. 125
– 6 –
SECTION 1
SERVICING NOTES
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
check that the S curve waveforms is output three times.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board. (within 3 times)
• Be careful not to apply force on the conductor when soldering
or unsoldering.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
Note:
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
other than those specified herein may result in hazardous ra-
diation exposure.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
exceeding the limit for Class 1.
The following caution label is located inside the unit.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY A
!
MARK ON THE SCHEMATIC
DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE
CRITICAL TO SAFE OPERATION. REPLACE THESE COMPO-
NENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
CRITICAL TO SAFE OPERATION. REPLACE THESE COMPO-
NENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
