Sony AC-LF1HR / DAV-LF1H Service Manual ▷ View online
2
AC-LF1HR
TABLE OF CONTENTS
1.
SERVICING NOTES
................................................
3
2.
GENERAL
...................................................................
4
3.
DISASSMEBLY
3-1.
Disassembly Flow ...........................................................
5
3-2.
Chassis .............................................................................
6
3-3.
DIAT POWER Board ......................................................
6
3-4.
POWER SWITCH (LFZ) Board And
SW LED Board ...............................................................
SW LED Board ...............................................................
7
3-5.
Top Cabinet .....................................................................
8
4.
DIAGRAMS
4-1.
Block Diagram ................................................................ 10
4-2.
Printed Wiring Board ....................................................... 11
4-3.
Schematic Diagram ......................................................... 12
5.
EXPLODED VIEWS
5-1.
Overall Section ................................................................ 13
6.
ELECTRICAL PARTS LIST
.................................. 14
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
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.
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.
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.
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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
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.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
free 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
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 viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
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.
also be added to ordinary solder.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE
WITH MARK
0
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.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
0
SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
1.5 k
Ω
0.15
µ
F
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
Fig. A.
Using an AC voltmeter to check AC leakage.
Ver. 1.2
3
AC-LF1HR
SECTION 1
SERVICING NOTES
•
SERVICING POSITION
DIAT POWER board
Refer to figure, and inspect the DIAT POWER board.
SW LED board
(CN905)
(CN905)
POWER SWITCH (LFZ) board
(CN901)
(CN901)
CN907
CN903
The units that are required for the system operation check during repair service
Unit
required for checking
required for checking
Unit to be
checked
DVD player:
HCD-LF1H
Subwoofer:
SA-WSLF1H
Front speaker:
SS-TSLF1H
Center speaker:
SS-CTLF1H
Surround speaker (L):
SA-TSLF1H
AC adaptor:
AC-LF1HR
Surround speaker (R):
SS-TSLF1HW
Remote commander:
RM-ADP011
HCD-LF1H
Subwoofer:
SA-WSLF1H
Front speaker:
SS-TSLF1H
Center speaker:
SS-CTLF1H
Surround speaker (L):
SA-TSLF1H
AC adaptor:
AC-LF1HR
Surround speaker (R):
SS-TSLF1HW
Remote commander:
RM-ADP011
DVD player:
HCD-LF1H
HCD-LF1H
Subwoofer:
SA-WSLF1H
SA-WSLF1H
Front speaker:
SS-TSLF1H
SS-TSLF1H
Center speaker:
SS-CTLF1H
SS-CTLF1H
Surround speaker
(L): SA-TSLF1H
(L): SA-TSLF1H
AC adaptor:
AC-LF1HR
AC-LF1HR
Surround speaker
(R): SS-TSLF1HW
(R): SS-TSLF1HW
*1 Only the defective unit.
Units with
Units with
a
mark: The units that are required for the system operation check during repair service.
(However, there can be a case that some units of the system need to not be brought into repair shop depending on the unit.that become defective.)
*1
4
AC-LF1HR
SECTION 2
GENERAL
This section is extracted
from instruction manual.
from instruction manual.
AC adaptor
A
SA-TSLF1H jack (24)
B
DIR-R3 jack (33)
C
POWER indicator (29)
D
POWER (29)
SA-TSLF1H
DIR-R3
5
AC-LF1HR
SECTION 3
DISASSEMBLY
3-3. DIAT POWER BOARD
(Page 6)
3-4. POWER SWITCH (LFZ) BOARD AND
SW LED BOARD
(Page 7)
3-5.TOP CABINET
(Page 8)
3-2. CHASSIS
(Page 6)
SET
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
