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SCD-XA777ES
Pages
127
Size
12.67 MB
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PDF
Document
Service Manual
Brand
Device
Audio
File
scd-xa777es.pdf
Date

Sony SCD-XA777ES Service Manual ▷ View online

21
SCD-XA777ES
4-1. IC  AND FLUORESCENT DISPLAY TUBE CHECK
(SELF-DIAGNOSIS)
The communication between microcomputer and main ICs (self-
diagnosis) and the fluorescent display tube all lit are checked.
Checking Method:
1. After setting the test mode, rotate the 
[        AMS        ]
 dial to
select “92. SET CHECK” and press the 
[        AMS        ]
 dial
to enter.
2. When  “SET TEST  START” is displayed, rotate the
[        AMS        ]
 dial clockwise by 1 click to select “0. IC&FL
CHECK?” and press the 
[        AMS        ]
 dial to enter.
3. A checking will start automatically, and “0. IC&FL CHECK”
will be displayed. (Checking time is about 3 seconds)
4. After IC communication check, all segments of fluorescent
display tube will be lit. At this time, check visually for a skipped
character.
5. At successful completion of check, “0. IC CHECK OK” is
displayed. In this case, no error exists in the IC interface. Pro-
ceed to 4-2. AUTO CHECK.
Note:
The check mentioned above tests the communication from micro-
computer to main ICs. Even if the check successfully finished, the
IC to be checked is not always normal. Consider it for reference
only.
6. In case of an IC communication error, the following display
will be given during the checking. Possible causes of error are
as listed below.
Error display
Causes  (typical example)
DVD DEC. ERROR
1. IC701 (SACD decoder) is faulty
2. IC701 pin <znv (XRST) does not go “H”
• IC901 pin rf (XDIS) does not go “H”
• IC902 (expander) is faulty
3. 768fs (33.86688 MHz) is not present to
IC701 pin <znm (XTAL)
• IC811 (3-multiplying circuit) is faulty
• Clock signal 256fs is not sent from
MOTHER board (CN302 pin 4)
• CN302 pin 1,5 (D.FGND) and pin 3
(+3.3V) are open or shorted
• CN302 and FFC connection is loose,
or FFC is disconnected
DVD DRAM ERR
1. IC706 (D-RAM) is faulty
2. IC701 pin <znv (XRST) does not go “H”
• IC901 pin rf (XDIS) does not go “H”
• IC902 (expander) is faulty
3. Faulty communication line between
IC701 and IC706
• Data line, address line, WE, etc.
4. D903 (1SS367) is faulty
CD DSP ERROR
1. IC509 (CD DSP) is faulty
2. 768fs (33.86688 MHz) is not present to
IC509 pin ua (XTAL)
Same as cause 3 of DVD DEC. ERROR
3. IC509 pin 2 (XRST) does not go “H”
• IC901 pin rf (XDIS) does not go “H”
• IC902 (expander) is faulty
EEPROM ERROR
1. IC903 (EEPROM) is faulty
Error display
Causes  (typical example)
PRAWN DRAM ERR
1. IC808 (D-RAM) is faulty
*1
2. IC801 (DSD decoder) is faulty
3. 768fs (33.86688 MHz) is not present to
IC801 pin qa (MCKI)
Same as cause 3 of DVD DEC. ERROR
4. IC801 pin 9 (XRST) does not go “H”
• IC901 pin rf (XDIS) does not go “H”
• IC902 (expander) is faulty
5. Faulty communication line between
IC801 and IC808
• Data line, address line, WE, etc.
6. D904 (1SS367) is faulty
D+3.3V is not present to IC808
RF AMP ERROR
1. IC001 (RF AMP) is faulty
2. Loose connection between CN503 on
MAIN board and CN001 on RF board,
or FFC disconnection
CN503 pin ql (CLK RF), pin w; (DATA
RF) and pin wa (SDEN) must be checked
*1 DSD decoder is also checked.
Causes Common to Each IC:
1. Faulty communication line between microcomputer and each
IC.
Disconnected patterns, floating series resistors, bridge, etc.
2. Faulty IC supply voltage.
Particularly, check D+3.3V voltage. (D+5V for display mi-
crocomputer)
3. Faulty microcomputer communication port to each IC
Note:
In case of more than two errors, the error display is switched over
one after another, thus making the reading difficult.
In such a case, press again the 
[        AMS        ]
 dial to make a
recheck for error reading.
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22
SCD-XA777ES
4-2. AUTO CHECK (AUTOMATIC VARIOUS MEASUREMENTS)
The auto check is performed to check if the set operates stably. Though a checking is made automatically, whether the measured data are
within the specification is evaluated by the service person. The auto check results in NG immediately, if the check itself causes an error.
Setting Method of Auto Check Mode:
1. After setting the test mode, rotate the 
[        AMS        ]
 dial to select “92. SET CHECK” and press the 
[        AMS        ]
 dial to enter.
2. When “SET TEST START” is displayed, rotate the 
[        AMS        ]
 dial clockwise by 2 clicks to select “1. TOTAL CHECK?”
and press the 
[        AMS        ]
 dial to enter.
3. When “10. TOTAL CHECK” is displayed, rotate the 
[        AMS        ]
 dial clockwise by 1 click to select “11. AUTO  CHECK?”.
CD and SACD (SL) Disc Operation Check
Checking method:
1. Press the 
[OPEN/CLOSE]
 button to open the tray and place the test disc *1.  The [OPEN/CLOSE] key is disabled immediately after the
machine enters the TEST mode. Be sure to initialize the table.
2. Press the 
[        AMS        ]
 dial, and the following check will be performed automatically.
3. Finally, the test disc will be ejected and the auto check will finish.
4. “AUTO CHECK OK” will be displayed at successful completion of auto check.
5. Recheck is enabled if the 
[        AMS        ]
 dial is pressed in step 4. (Also, use this operation when exchanging the test disc)
6. In case of an error during the checking, the check is interrupted automatically and the error is displayed. (Error display example:
“DISC DETECT ERROR”)  After error display, “CONT?STOP (J/S)” is displayed. In this case, if the 
[        AMS        ]
 dial is pressed,
the check where the error occurred is skipped and you can proceed to the next check. Also, if the x button is pressed, the check
finishes and “AUTO CHECK NG” is displayed when even one NG item exists.
*1 Use PATD-012 or YEDS-18 for CD, and SATD-S5 or SATD-S4 for SACD (SL). Using another disc will result in a checking failure.
Check Items:
Items
Description
Remarks
LOAD IN TIME (msec)
Time until a disc is chucked from the state where loading tray is out
Loading in switch    HtL
SPIN UP TIME (msec)
Time from spindle kick to PLL lock
Lock signal    LtH
RF/VC/FE/TE (ORG)
Offset values before RF (PI), VC, FE, TE signal offset adjustment
At offset 0
RF (8 bit data in hex notation)
RF: A0h
VC, FE, TE (9 bit data in hex notation)
VC, FE, TE: 00h
RF/VC/FE/TE (ADJ)
Offset values after RF (PI), VC, FE, TE signal offset adjustment
VC offset is not adjusted
(Less than ORG value if offset correction is normal)
(Measurement only)
RF (8 bit data in hex notation)
Also, for SACD, the TE offset is
VC, FE, TE (9 bit data in hex notation)
not measured and adjusted
PI/TRVS PP (ORG/ADJ)
PI (ORG): PI value at disc type check (decimal data)
PI level conversion
PI (ADJ): PI value after PI offset adjustment
Read value 
×
 12.9mV
(read value at microcomputer A/D) (decimal data)
TRVS PP (ORG): Traverse level before level correction (AGC)
Traverse level conversion
(decimal data)
Read value 
×
 12.9mV
TRVS PP (ADJ):Traverse level after level correction (AGC)
(decimal data)
12.9mV=3.3V 
÷
 256 (8 bit)
PIOR/CCR/TRCR
PIOR: Set value of PI offset coarse adjusting register
Registers in RF amplifier
CCR: Set value of FE offset coarse adjusting register
TRCR: Set value of TE offset coarse adjusting register
FOCUS/TRK GAIN
Auto gain adjusted values of focus and tracking servos
Reference: 30h
(8 bit data in hex notation)
FBIAS/TRVSC/TRCR2/CFR
FBIAS: Focus bias set value (9 bit data in hex notation)
TRCR2 adjusts the E-F gain
TRVSC: Traverse center value (9 bit data in hex notation)
balance and used for CD only
TRCR2: Set value of E-F balance coarse adjusting register
(Fixed to 06 for SACD)
CFR: Set value of traverse level adjusting register
TRCR2 and CFR are registers in
RF amplifier
MIN JITTER AT F.BIAS
Minimum jitter value in focus bias adjustment (CD only)
Correlative with RF jitter
READ TOC TIME (msec)
Time required for TOC reading
PSP AMPLITUDE
SACD only
1/3 SEEK TIME
Seek time between 1/3LBA and 2/3LBA of the disc
LBA: Absolute address
F) AVE/MIN/MAX (msec):
1/3LBAt2/3LBA    average/minimum/maximum
R) AVE/MIN/MAX (msec):
2/3LBAt1/3LBA    average/minimum/maximum
1/MAX SEEK TIME
Seek time between most inward track (0LBA) and most outward track max
LBA
F) AVE/MIN/MAX (msec):
most inwardtmost outward    average/minimum/maximum
R) AVE/MIN/MAX (msec):
most outwartmost inward    average/minimum/maximum
ERROR RATE
Error rate measurement
Measure for 10 sec at track No.5
For CD: Average value/Maximum value of C1 and C2
For the SACD, 160 block data
For SACD: Average value/Maximum value of PO, PI1 and PI2
except the data under tracking jump
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23
SCD-XA777ES
Items
Description
Remarks
HENSIN
Eccentricity measurement
For the CD only are measured
Eccentricity (actual eccentric amount) of disc, disc pulley total
• Read by dividing by 10
• 0 may be displayed if eccentricity
is small (10um or less) (Due to
measurement reason)
SPIN DOWN TIME (msec)
Time from spindle brake application to rotation stop
FG (IC901 pin ys) monitoring
FG LEVEL [STEP]
FG value of dics inner position
LOAD OUT TIME (msec)
Time until loading table comes out from the state where a disc is in chuck
Loading out switch    HtL
Measured Data Reading Method:
To judge the check result, the measured data must be read.
1. When “AUTO CHECK OK” is displayed, rotate the 
[        AMS        ]
 dial clockwise by 2 clicks.
2. When “13. DISP RSLT?” is displayed, press the 
[        AMS        ]
 dial to enter.
3. “PLEASE WAIT” will be displayed and in several seconds, “13. DISP RESULT” will be displayed.
4. Rotate the 
[        AMS        ]
 dial clockwise by 1 click, and the “LOAD IN” will be displayed.
5. Press the 
[        AMS        ]
 dial to enter. The LOAD IN TIME measured value will be displayed.
6. Compare the displayed value with the following specified value.
7. Hence, repeat step 4 to 6 (display is variable) and read the measured data respectively.
8. Compare the measured data with the specified value to check for NG item.
Note:
Blank display of measured value means that an error occurred during the checking or no measurement was taken place.
Specified Value:
(1) SACD (Use the test disc SATD-S5 or SATD-S4)
Note:
Measured values in check items are typical ones.
Check items
Specified value
LOAD IN TIME (msec)
:
3000 msec or less
SPIN UP TIME (msec)
: 1652
3000 msec or less
RF/VC/FE/TE AVRG (ORG)
: 98, C, 1DE, 0
RF: 7E-9E, VC: 1F1-10, FE: 1B8-42, TE: 1BB-5C
RF/VC/FE/TE AVRG (ADJ)
: 9F, C, 4, 0
RF: 98-A5, VC : 1F1-10, FE: 1F1-10, TE: 1F1-10
PI/TRVS PP (ORG/ADJ)
: 81, 131, 78, 105
PI ORG: 70-89,  PI ADJ: 122-135, TRVS ORG: 68-114, TRVS ADJ: 55-100
PIOR/CCR/TRCR
: 1A, 31, 1F
No specified value given
FOCUS/TRK GAIN
: 2E, 24
FOCUS: 10-40, TRK: 10-40
FBIAS/TRVSC/TRCR2/CFR
: 2,13, 6, 60
F.BIAS: 1D0-4F, TRVSC: 1D0-30    TRCR2, CFR: no specified value given
READ TOC TIME (msec)
: 1283
2200 msec or less
PSP AMPLITUDE
: 1666
1300 or above
1/3 SEEK TIME
F) AVE/MIN/MAX (msec)
: 967, 928, 990
AVE: 1100 msec or less, MAX: 1300 msec or less
R) AVE/MIN/MAX (msec)
: 974, 933, 993
AVE: 1100 msec or less, MAX: 1300 msec or less
1/MAX SEEK TIME
F) AVE/MIN/MAX (msec)
: 1958, 1938, 1968
AVE: 2200 msec or less, MAX: 2500 msec or less
R) AVE/MIN/MAX (msec)
: 1915, 1909, 1935
AVE: 2200 msec or less, MAX: 2500 msec or less
ERROR RATE
PO MAX/AVE FRAME
: 0, 0
No specified value given
PO MAX/AVE NUM
: 160, 3
MAX: 1000 or less, AVE: 100 or less
PI1 MAX/AVE FRAME
: 0, 0
No specified value given
PI1 MAX/AVE NUM
: 242, 17
MAX: 1000 or less, AVE: 100 or less
PI2 MAX/AVE FRAME
: 0, 0
No specified value given
PI2 MAX/AVE NUM
: 128, 2
MAX: 1000 or less, AVE: 100 or less
SPIN DOWN TIME (msec)
: 1342
2500 msec or less
FG LEVEL [STEP]
: 82
100 or less
LOAD OUT TIME (msec)
:
3000 msec or less
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* Items are not used in the
SATD-S5.
24
SCD-XA777ES
(2) CD (Use the test disc PATD-012 or YEDS-18)
Note:
Measured values in check items are typical ones.
Check items
Specified value
LOAD IN TIME (msec)
:
3000 msec or less
SPIN UP TIME (msec)
: 1372
2500 msec or less
RF/VC/FE/TE AVRG (ORG)
: 98, C, 1D6, 4
RF: 7E-9B, VC: 1F1-10, FE: 1B8-42, TE: 1BB-5C
RF/VC/FE/TE AVRG (ADJ)
: 9F, A, 1FF, 4
RF: 98-A5, VC: 1F1-10, FE: 1F1-10, TE: 1F1-10
PI/TRVS PP(ORG/ADJ)
: 81, 131, 95, 92
PI ORG: 70-89,  PI ADJ: 122-135, TRVS ORG: 70-120, TRVS-ADJ: 70-120
PIOR/CCR/TRCR
: 1A, 11, 1F
No specified value given
FOCUS/TRK GAIN
: 2E, 2D
FOCUS: 20-40, TRK: 20-40
FBIAS/TRVSC/TRCR2/CFR
: 0, 10, 5, A0
F.BIAS: 1E0-30,  TRVSC: 1F0-10    TRCR2, CFR: no specified value given
MIN JITTER AT F.BIAS
: 94
100 or less
READ TOC TIME (msec)
: 1410
2500 msec or less
1/3 SEEK TIME
F) AVE/MIN/MAX (msec)
: 824, 804, 850
AVE: 1000 msec or less, MAX: 1200 msec or less
R) AVE/MIN/MAX (msec)
: 850, 833, 860
AVE: 1000 msec or less, MAX: 1200 msec or less
1/MAX SEEK TIME
F) AVE/MIN/MAX (msec)
: 2086, 1999, 2151
AVE: 2300 msec or less, MAX: 2500 msec or less
R) AVE/MIN/MAX (msec)
: 1805, 1793, 1835
AVE: 2300 msec or less, MAX: 2500 msec or less
ERROR RATE
C1 MAX/AVE
: 3, 0
C1  MAX: 15 or less
C2 MAX/AVE
: 0, 0
C2  MAX: 0
HENSHIN RYOU (1/10um)
: 89
800 or less (100 um or less)
SPIN DOWN TIME (msec)
: 1272
2000 msec or less
FG LEVEL [STEP]
: 82
100 or less
LOAD OUT TIME (msec)
:
3000 msec or less
Note:
RF, VC, FE, TE, FBIAS and TRVSC measured values are hexadecimal data with positive and negative signs. When comparing the measured
value with the specified value, refer to the following.
Hexadecimal (hex) display 9 bit data
FF
011111111 (+255) 
FE
011111110 (+254) 
(+) Side
(-) Side
MAX
01
000000001 (+1) 
00
000000000 (0) 
1FF
111111111 (-1) 
101
100000001 (-255) 
100
100000000 (-256) 
Hexadecimal (hex) display 8 bit data
7F
01111111 (+127) 
7E
01111110 (+126) 
01
00000001 (+1) 
00
00000000 (0) 
02
00000010 (+2) 
FF
11111111 (-1) 
FE
11111110 (-2) 
81
10000001 (-127) 
80
10000000 (-128) 
MIN
0
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