Sony MDS-JE320 Service Manual ▷ View online
— 5 —
SECTION 1
SERVICING NOTE
JIG FOR CHECKING BD BOARD WAVEFORM
The special jig (J-2501-124-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.
performed are shown as follows.
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP
IOP
: For measuring IOP (Check the deterioration of the optical pick-up laser)
TEO : TRK error signal (Traverse adjustment)
VC
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
FORCED RESET
The system microprocessor can be reset in the following way.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Method :
Disconnect the power plug, short-circuit jumper wire of JW70 and JW181.
Disconnect the power plug, short-circuit jumper wire of JW70 and JW181.
[MAIN BOARD] (Component Side)
Mechanism deck
CN110
RF
VC
TEO
IOP
I + 3V
Jig
(J-2501-124-A)
(J-2501-124-A)
Jumper wire
JW181
JW70
BT301
IC301
— 6 —
RETRY CAUSE DISPLAY MODE
• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent display tube.
This is useful for locating the faulty part of the unit.
• The data amount stored in DRAM, number of retries, and retry cause are displayed. Each is displayed in hexadecimal number.
• The display of the DRAM data amount enables data reading, accumulation, ejection, and writing to be performed smoothly. If writing is
• The display of the DRAM data amount enables data reading, accumulation, ejection, and writing to be performed smoothly. If writing is
not smooth, data may decrease considerably.
Method:
1.
1.
Load a recordable disc whose contents can be erased into the unit.
2.
Press the EDIT/NO button several times to display “All Erase?” on the fluorescent display tube.
3.
Press the YES button.
4.
When “All Erase??” is displayed on the fluorescent display tube, the numbers on the music calendar will start blinking.
5.
Press the YES button to display “Complete”, and press the
p button immediately and continue pressing for about 10 seconds.
6.
When the “TOC” displayed on the fluorescent display tube goes off, release the
p button.
7.
Press the
r REC and · PLAY buttons to start recording.
8.
Press the DISPLAY/CHAR button to display the test mode (Fig. 1), and check the display.
9.
The Rt value increases with each retry. If an error occurs after a retry, “Retry Error” will be displayed, and the number of retries counted
will be set back to 0.
will be set back to 0.
10. To exit the test mode, press the 1/u button. Turn OFF the power, and after “TOC” disappears, disconnect the power plug from the outlet.
Fig. 1 Reading the Test Mode Display
Fluorescent Display Tube Signs
Fluorescent Display Tube Signs
SC @@
Rt # #
∗
∗
@@ : Displays the DRAM memory amount when at all times.
# #
# #
: Displays the number of retries. When a retry error occurs, the number will be set back to 0.
* *
: Cause of retry
All three displays above are in hexadecimal numbers.
— 7 —
Reading the Retry Cause Display
Hexadecimal
Bit
Binary
Higher Bits
Lower Bits
8
4
2
1
8
4
2
1
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
When spindle rotation is detected as slow
(Not used)
When ADER was counted more than
five times continuously
When ADIP address is not continuous
(Not used)
When not in focus
When ABCD signal level exceeds the specified range
When CLV is unlocked
When access operation is not performed normally
Hexa-
decimal
Spindle is slow
(Not used)
ader5
Discontinuous address
(Not used)
FCS incorrect
IVR rec error
CLV unlock
Access fault
Cause of Retry
Occurring conditions
00
01
02
04
08
10
20
40
80
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example
When 42 is displayed:
Higher bit : 4 = 0100
When 42 is displayed:
Higher bit : 4 = 0100
n b6
Lower bit : 2 = 0010
n b1
In this case, the retry cause is combined of “CLV unlock” and “ader5”.
When A2 is displayed:
Higher bit : A = 1010
Higher bit : A = 1010
n b7+b5
Lower bit : 2 = 0010
n b1
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.
Hexadecimal
n
Binary Conversion Table
Hexadecimal
Binary
Hexadecimal
Binary
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
— 8 —
SECTION 2
GENERAL
Location of Parts and Controls
1
1/u (Power) switch
2
Remote sensor
3
Display window
4
Disc compartment
5
AMS knob
6
0/) buttons
7
DISPLAY/CHAR button
8
INPUT switch
9
REC LEVEL knob
!£
r REC (recording) button
!¢
p (stop) button
!∞
P (pause) button
!§
· (play) button
!¶
YES button
!•
EDIT/NO button
!ª
§ EJECT button
1
2
3
4
5
6
8
7
!ª
!•
!¶
!§
9
!∞
!¢
!£
Click on the first or last page to see other MDS-JE320 service manuals if exist.