Sony MZE-501 Service manual
MZ-E501
SERVICE MANUAL
Ver 1.1 2001. 11
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation
AEP Model
Hong Kong Model
Model Name Using Similar Mechanism MZ-E500
MD Mechanism Type MT-MZE500-174
Optical Pick-up Mechanism Type LCX-4E
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength: λ = 790 nm
Emission duration: continuous
Laser output: less than 44.6 µW*
* This output is the value measured at a distance of 200 mm from the
objective lens surface on the optical pick-up block with 7 mm aperture.
Revolutions
Approx. 300 rpm to 2,700 rpm
Error correction
ACIRC (Advanced Cross Interleave Reed Solomon Code)
Sampling frequency
44.1 kHz
Coding
ATRAC (Adaptive TRansform Acoustic Coding)
ATRAC3: LP2
ATRAC3: LP4
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limits
SPECIFICATIONS
Outputs
Headphones/earphones: stereo mini-jack, maximum output level 5 mW +
5 mW, load impedance 16 ohms
Power requirements
Nickel Cadmium rechargeable battery
One NC-6WM (supplied): 1.2V, 600 mAh
One LR6 (size AA) battery (not supplied)
External power jack: Power rating 3V DC
AC power adaptor for the battery charging stand (supplied): AC230~240V,
50Hz
Battery operation time
See “When to replace or recharge the battery”
Dimensions
Approx. 74.5 × 80.5 × 17.9 mm (w/h/d) (3 × 3 1/4× 23/32 in.)
(not including projecting parts and controls)
Mass
Approx. 80 g (2.8 oz) (the player only)
Supplied accessories
Headphones/earphones with a remote control (1)
Battery charging stand (assembly needed)(1)
AC power adaptor*
Rechargeable battery (1)
Rechargeable battery carrying case (1)
Dry battery case (1)
Carrying pouch (1)
AC plug adaptor (1) (world model only)
US and foreign patents licensed from Dolby Laboratories.
Design and specifications are subject to change without notice.
9-873-162-02
2001K1600-1
© 2001.11
PORTABLE MINIDISC PLAYER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
MZ-E501
TABLE OF CONTENTS
1. SERVICING NOTE···················································· 3
2. GENERAL ·································································· 4
3. DISASSEMBLY
3-1. Case Assy, Holder Assy ·················································· 5
3-2. Mechanism Deck ···························································· 6
3-3. Bracket Assy ··································································· 6
3-4. Main Board ····································································· 7
3-5. Optical Pick-up Assy (LCX-4E)····································· 7
4. TEST MODE ······························································ 8
5. ELECTRICAL ADJUSTMENTS ··························· 12
6. DIAGRAMS
6-1. Block Diagram ······························································ 17
6-2. Printed Wiring Board – Main Section (Side A) – ········· 18
6-3. Printed Wiring Board – Main Section (Side B) – ········· 19
6-4. Schematic Diagram – Main Section (1/3) –·················· 20
6-5. Schematic Diagram – Main Section (2/3) –·················· 21
6-6. Schematic Diagram – Main Section (3/3) –·················· 22
6-7. IC Block Diagrams ······················································· 23
6-8. IC Pin Function Description ·········································25
7. EXPLODED VIEWS
7-1. Main Section ································································· 31
7-2. Mechanism Deck Section ············································· 32
8. ELECTRICAL PARTS LIST ·································· 33
CAUTION
Use of controls or adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270°C during
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 chip component replacement
• Nev er reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
Unleaded solder
Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
MARK !ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
2
SECTION 1
Open/Close detection switch (S809)
SERVICING NOTES
MZ-E501
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
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
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(LCX-4E)
The laser diode in the optical pick-up block may suffer electrostatic
break-down easily. When handling it, perform soldering bridge to
the laser-tap on the flexible board. Also perform measures against
electrostatic break-down sufficiently before the operation. The
flexible board is easily damaged and should be handled with care.
When repairing this device with the power on, if you remove the
main board, this device stops working.
In this case, you work without the device stopping by fastening the
hook of the Open/Close detection switch (S809).
* Replacement of CXD2671-205GA (IC601) used in this set
requires a special tool.
OPTICAL PICK-UP FLEXIBLE BOARD
laser-tap
3
MZ-E501
LOCATION AND FUNCTION OF CONTROLS
SECTION 2
GENERAL
This section is extracted from
instruction manual.
VOL+/–
>N
.
GROUP
x
X
3 Color Info-LED
PLAYMODE RPT/ENT
DISPLAY SOUND
VOL+
VOL–
1N>
.
x
HOLD
./N>
VOL +/–
GROUP
x
3 Color Info-LED
HOLD
4
r
Disassemble the unit in the order as shown below.
MZ-E501
SECTION 3
DISASSEMBLY
Case assy, Holder assySet
Mechanism deck
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE ASSY, HOLDER ASSY
screws (1.4), MI
1
3
Move it away
from the projection
2
Bracket assy MAIN board
Optical pick-up assy (LCX-4E)
case assy
1
screws (1.4), MI
hold assy
3
from the projection
case (rear)
Move it away
5
MZ-E501
y
d
3-2. MECHANISM DECK
6
(CN551)
MOTER FLEXIBLE board
4
1
step screw (MD)
mechanism deck
5
OP FLEXIBLE boar
(CN501)
3-3. BRACKET ASSY
3
2
screw (1.7)
4
bracket (L) assy
claw
3
claw
1
screw (1.7)
2
bracket (R) ass
3
claw
6
3-4. MAIN BOARD
g
7
battery case assy
1
screw (1.7)
5
Remove the soldering
2
claw
6
MAIN board
4
ornamental strip
5
Remove the soldering
MZ-E501
3
battery case lid
3-5. OPTICAL PICK-UP ASSY (LCX-4E)
optical pick-up assy (LCX-4E)
1
washer
2
gear (SA)
case (rear)
5
3
screw (MI 1.4)
4
thrust detent sprin
7
MZ-E501
SECTION 4
TEST MODE
4-1. GENERAL
• When entered in the TEST MODE, this set provides the Overall
Adjustment mode which allows CD and MO discs to be automatically adjusted. In the Overall Adjustment mode, the system
discriminates between CD and MO discs, performs adjustments
in sequence automatically, and displa ys the faulty location if an y
fault is found. In the Manual mode, selected adjustments can be
performed automatically.
• The attached remote control is used to operate the TEST MODE.
Unless otherwise specified in the text, the key means that on the
remote control.
4-2. SETTING THE TEST MODE
4-2-1. How to set the TEST MODE
To set the TEST MODE, two methods are available.
1 Solder bridge and short TAP601 (TEST) on the main board.
Then turn on the power . Press the x b utton or close the upper
panel.
MAIN BOARD (SIDE B)
Remote control LCD
All on
All off
012 V1.110
Microprocessor
version
display
• Press and hold down X to hold the current display while the key
is being pressed.
4-2-3. How to release the TEST MODE
When method 1 was used:
Turn off the power and open the solder bridge on TAP601 on the
main board.
Note : The solder should be removed clean. The remaining solder
may make a short with the chassis and other part.
When method 2 was used:
Turn off the power.
Note : If electrical adjustment (see page 12) has not been finished
completely, always start in the test mode. (The set cannot
start in normal mode)
TAP601
OPEN : Normal mode
SHORT : Test mode
2 In the normal mode, operate the keys on the set and those on the
remote control rapidly as specified below:
Turn on HOLD switch on the set. Holding down x (STOP)
key on the set, press the keys on the remote control in the
following sequence:
> N t > N t . t . t > N
t . t > N t . t X t X
Note : When you press an incorrect switch by mistake, remove your
hands from the switches and perform all the operations once
again from the very beginning.
4-2-2. Operations when the TEST MODE is set
When the TEST MODE is entered, the system switches to the
display check mode within the TEST MODE. From this mode, the
other Test modes can be accessed.
When the TEST MODE is set, the LCD repeats a cycle of the
following displays:
4-3. TEST MODE STRUCTURE
Test Mode
(Display Check Mode)
+
key
VOL
Manual Mode
x
key
+
key
VOL
–
VOL
key
.
DISPLAY key
DISPLAY key
(Press and hold down about 3 sec)
Terminate key checking or open
the top panel.
or
VOL
x
x
>B
x
key
key
key
–
key
Overall Adjustment Mode
Self-diagnostic Display Mode
key
Sound Skip Check Result Display Mode
Servo Mode
Audio Mode
Power Mode
OP Alignment Mode
Key Check Mode
8
MZ-E501
4-4. MANUAL MODE
4-4-1. Outline of the function
The Manual mode is designed to perform adjustments and
operational checks on the set’s operation according to each
individual function.
Usually, no adjustments are made in this mode.
However, the Manual mode is used to clear the memory before
performing automatic adjustments in the Overall Adjustment mode.
4-4-2. How to set the Manual mode
1. Set the TEST MODE and press VOL+ key to set the Manual mode.
Remote control LCD display
000 Manual
2. During each test, press and hold down > N key or .
key for a while to move the optical pickup on the sled outer or
inner perimeter.
3. Each test item is assigned with a three-digit item number. The
100th place is a major item, 10th place is a middle item, and unit
place is a minor item.
+
key : 100th place of mode number
Change Major
Item
> N
VOL
increase
–
key : 100th place of mode number
VOL
decrease
x
keykey
4. During each test mode, the display is changed from one to
another each time DISPLAY key is pressed.
• Address & Adjusted Value Display
LCD display
011 C68S5E
mode number
adress
• Jitter Value & Adjusted Value Display
LCD display
adjusted value
011 OFEJ5E
mode number
jitter value
• Block Error Value & Adjusted Value Display
LCD display
adjusted value
011 063B5E
block error value
mode number
• ADIP Error Value & Adjusted Value Display
LCD display
adjusted value
Change Middle
Item
> N
key
Change Minor
Item
x
+
key : 10th place of mode number
VOL
increase
–
key : 10th place of mode number
VOL
decrease
key
key : Unit place of mode number
> N
increase
.
key : Unit place of mode number
decrease
+
VOL
VOL
key : Up
–
key : Down
Change Adjustment
Value
Write Adjustment
Value
X
key : When adjusted value is changed :
Adjusted value is written.
When adjusted value is not changed :
That item is adjusted automatically.
011 072A5E
ADIP error value
mode number
• Focus Drive Voltage Value &
Adjusted Value Display
adjusted value
011 000F5E
forcus drive
voltage value
mode number
• Item Title Display
LCD display
adjusted value
011 LrefPw 5 E
item title
mode number
Note: In the Power mode, the item title display is only displayed.
5. To terminate the Manual mode and return to the TEST MODE,
press x key.
4-5. OVERALL ADJUSTMENT MODE
adjusted value
4-5-1. Outline of the function
This mode is designed to adjust the servo system automatically by
going through all the adjustment items.
The power adjustment manual setting is performed in this mode also.
Usually, this mode is used to perform automatic adjustments when
servicing the set.
For further information, refer to section 5. ELECTRICAL
ADJUSTMENTS. (See page 12)
9
MZ-E501
4-6. SELF-DIAGNOSTIC DISPLAY MODE
4-6-1. Outline of the function
The Self-diagnostic system is used in this set. If an error occurs
during playback, this system detects the fault through the
microprocessor’s mechanism and power control blocks and stores
the cause in EEPROM in a history format.
This history, which can be viewed in the TEST MODE, provides
the means of locating the fault in troubleshooting.
4-6-2. Self-diagnostic mode
1. Set the TEST MODE.
2. With all the LCD display segments blinking on the set, press
DISPLAY key and the Self-diagnostic mode is entered.
001 1 Adrs
History code
Error display code
Simplified contents
3. Hereinafter, each time > N key is pressed, the reference
information display changes as follows:
0XX 1 # # # #
0XX N # # # #
0XX N1 # # # #
0XX N2 # # # #
0XX R
• Press . key to go back to the previous display.
• Contents of the history codes
History code number Contents
1 The first error that occurred.
N The last error that occurred.
N-1 The first error from the last one.
N-2 The second error from the last one.
R
T otal recording time ( – – – – is displayed
for MZ-E501)
– – – –
• Description of the error display codes
Contents of fault
No error
Servo system error
TOC error
Power system error
Offset error
4-6-3. Clearing the error display code
After servicing, reset the error display code.
1. Set the TEST MODE.
2. Pressing the DISPLAY key on the remote control activates the
self-diagnosis display mode.
3. To reset the error display code, press X key (2 times)on the
remote control when the code is displayed. (except “R - - - -” )
(All the data on the 1st, N, N-1 and N-2 will be reset)
Display code
00
01
02
03
04
11
12
22
31
32
33
34
No error
Access target address illegally specified
HIGH TEMP
FOCUS ERROR
SPINDLE ERROR
TOC ERROR
READ DATA ERROR
LOWBATT
OFFSET ERROR
FE_ABCD_OFFSET_ERR
TE_OFFSET_ERR
X1_TE_OFFSET_ERR
Meaning of code
Simplified
contents
– – – –
Adrs
Temp
Fcus
Spdl
TOC
Data
LBat
Ofst
ABCD
TE
X1TE
Description
No error
An attempt to access an abnormal address.
HIGH TEMP
Focus off-center.
Abnormal rotation of disc
Faulty TOC contents
Data could not be read at SYNC
Instantaneous interruption detected.
Offset error
FE ABCD Offset error
TE Offset error
X1 TE Offset error
10
MZ-E501
4-7. Sound Skip Check Result Display Mode
This set can display and check the error count occurring during
play.
• Setting method of Sound Skip Check Result Display Mode
1. Setting the test mode.
2. Pressing the > N key activates the sound skip check result
display mode where the LCD displays as shown below.
LCD display
000 P**R##
Total of record system
error count
Total of play system error count
3. When > N key is pressed, the total of error count is
displayed on the LCD, and each time the > N key is pressed,
the error count descents one by one as shown below . Also, when
. key is pressed, the error count ascends one by one.
000 P**R00
000 EIB **
000 Stat**
4-8. KEY CHECK MODE
4-8-1. Outline of the function
This mode is used to check to make sure that each of the keys
(including the slide switch) on the set operates normally .(The 1 kHz
signal is outputted from the L and R channels of head phones)
4-8-2. Setting the Key Check mode
1. Set the TEST MODE. Press and hold down DISPLAY key (for
more than 3 sec) to set the Key Check mode.
LCD display
000 0F
2. When each key on the set and on remote control is pressed, its
name is displayed on the LCD. (The operated position is
displayed for 4 sec after the slide switch is operated. If any other
key is pressed during this display , the LCD switches to its name
display)
Example: When > N key on the set is pressed:
LCD display
000 FF 0F
Example: When > N key on the remote control is pressed:
LCD display
000 Adrs**
000 BEmp**
000 ######
P**R00 : Total of play system error and record system error count
** : Sound skip check items counter (hexadecimal)
##### : 6-digit address (hexadecimal) where a sound skipped last
Error code
Cause of error
Playback
4. Press the x key to terminate the sound skip check result display
mode and to return to the test mode. (Display check mode)
EIB
Stat
Adrs
BEmp
Description of error
Sound error correction error
Decorder status error
Cannot access the address
Buffer becomes empty
000 rPLAY XX
XX: AD v alue of the remote control key (he xadecimal 00 to FF)
3. When all the keys on the set and on the remote control are
considered as OK, the following displays are shown for 2 sec.
(The key pressed to enter the Key Check mode has been check ed
even if it is not pressed in this mode)
Example: When the keys on the set are considered as OK:
LCD display
888 SET OK OF
Example: When the keys on the remote control are considered
as OK:
LCD display
888 RMC OK OX
4. When all the key have been checked or when the top panel is
opened during this checking, the system terminates the Key
Check mode and return to the TEST MODE.
11
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