DOWNLOAD Sony SCD-XA777ES Service Manual ↓ Size: 12.67 MB | Pages: 127 in PDF or view online for FREE

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

Sony SCD-XA777ES Service Manual ▷ View online

3
SCD-XA777ES
Notes on chip component replacement
• Never reuse a disconnected chip component.
• 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.
CAUTION
Use of controls or adjustments or performance of procedures
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 following caution label is located
inside the unit.
SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE  TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable.  (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
This label is located on the left exterior.
US and Canadian models
AEP model
4
SCD-XA777ES
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.
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.
CLEANING  OF  OPTICAL  PICK-UP LENS
In cleaning the lens of optical pick-up, use the air blower.
Never use a cotton swab for cleaning the lens of optical pick-up,
which otherwise causes a trouble.
RESETTING  OPERATION  AT  POWER  ON
If the power is turned on with a disc loaded in the set, a sequence
of operation as shown below will be performed.
(The operation varies depending on the type of disc)
Condition: continue mode
(1) CD
 1.
Sled reverse move (sled in)
 2.
Disc detect
 3.
IC setting for CD
 4.
Servo error signal offset auto adjustment
 5.
Spindle kick for LD on
 6.
LD on
 7.
Focus search
 8.
Focus servo on
 9.
Spindle kick
 10. Spindle servo on
 11. E-F balance auto adjustment
 12. Tracking & sled servo on
 13. Focus bias auto adjustment
 14. Focus servo gain auto adjustment
 15. Tracking servo gain auto adjustment
 16. Jump to lead-in area
 17. Read TOC
 18. Stop
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
(2) SACD (single layer)
 1.
Sled reverse move (sled in)
 2.
Disc detect
 3.
IC setting for SACD
 4.
Servo error signal offset auto adjustment
 5.
Spindle kick for LD on
 6.
LD on
 7.
Focus search
 8.
Focus servo on
 9.
Spindle kick
 10. Spindle servo on
 11. E-F balance auto adjustment
 12. Tracking & sled servo on
 13. Focus bias auto adjustment
 14. Focus servo gain auto adjustment
 15. Tracking servo gain auto adjustment
 16. Jump to lead-in area
 17. Read TOC
 18. Stop
(3) SACD (dual layer)
 1.
Sled reverse move (sled in)
 2.
Disc detect
 3.
IC setting for SACD
 4.
Servo error signal offset auto adjustment
 5.
Spindle kick for LD on
 6.
LD on
 7.
Focus search
 8.
Focus servo on (layer 0)
 9.
Spindle kick
 10. Spindle servo on
 11. E-F balance auto adjustment (layer 0)
 12. Tracking & sled servo on (layer 0)
 13. Focus bias auto adjustment (layer 0)
 14. Focus servo gain auto adjustment (layer 0)
 15. Tracking servo gain auto adjustment (layer 0)
 16. Jump to lead-in area
 17. Read TOC
 18. Focus jump (layer 0tlayer 1)
 19. E-F balance auto adjustment (layer 1)
 20. Tracking & sled servo on (layer 1)
 21. Focus bias auto adjustment (layer 1)
 22. Focus servo gain auto adjustment (layer 1)
 23. Tracking servo gain auto adjustment (layer 1)
 24. Focus Jump (layer 1tlayer 0)
 25. Stop
Part No.
MODEL  IDENTIFICATION
– Back Panel –
Model
Part No.
US and Canadian
4-235-601-1
[]
AEP
4-235-601-2
[]
5
SCD-XA777ES
HOW  TO  OPEN  THE  DISC  TABLE  WHEN  POWER  SWITCH  TURNS  OFF
OPTICAL  PICK-UP  SERVICE  POSITION
Place the insulator on the MAIN board, then install the base unit (DVBU4B) on it as shown in the figure.
disc table
loading panel assy
tapering driver
cover (CAM)
2
Draw out the loading panel assy
in the direction of arrow 
B
.
1
Insert a tapering driver in the hole
at the bottom of the unit,
turn the cover (CAM) fully in the
direction of arrow 
A
.
B
A
base unit
(DVBU4B)
MAIN board
insulator
6
SCD-XA777ES
Note:
 Follow the disassembly procedure in the numerical order given.
D-POWER/POWER  BOARDS  AND  RF  BOARD  SERVICE  POSITION
1
Remove the case.
2
Turn over the set.
4
two bottom plates
3
four screws (3 
×
 8)
3
eight screws (3 
×
 8)
D-POWER board
POWER board
INSTALLATION TWO WIRES (FLAT TYPE) (25/35 CORE)
Note: When the wire (flat type) (35 core) is disconnected 
from the RF board, then it is again connected, 
disconnect the wire (flat type) (25 core) once, 
and reconnect the wire (flat type) (35 core) first.
wire (flat type) (35 core)
wire (flat type) (25 core)
RF board
– BOTTOM  VIEW –
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Sony SCD-XA777ES Service Manual ▷ Download

  • DOWNLOAD Sony SCD-XA777ES Service Manual ↓ Size: 12.67 MB | Pages: 127 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony SCD-XA777ES in PDF for free, which will help you to disassemble, recover, fix and repair Sony SCD-XA777ES Audio. Information contained in Sony SCD-XA777ES Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.