Sony SAWMSP-68 Service manual
SA-WMSP68
SERVICE MANUAL
Ver 1.0 2004.07
•SA-WMSP68 is the subwoofer section
in HT-5800DP/6800DP/DDW960.
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 6 ohm loads, from 28 – 200 Hz; rated 100
watts, minimum RMS power, with no more than
0.8% total harmonic distortion from 250
milliwatts to rated output.
US Model
Speaker system Active subwoofer,
Speaker unit 250 mm cone type
Enclosure type Acoustically loaded bass
RMS output 120 W (6 ohms, 100 Hz,
Input LINE IN (input pin jacks)
Power requirements 120 V AC, 60 Hz
Power consumption 95 W
Dimensions (w/h/d) (Approx.)
Mass (Approx.) 28 lb 11 oz (13.0 kg)
Design and specifications are subject to change without
notice.
magnetically shielded
reflex
THD 10%)
13 3/8 × 16 2/8 × 14 4/8
inches (337 × 410 × 365.5
mm) including front panel
9-879-059-01
2004G04-1
© 2004.07
SUB WOOFER
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
1
r
SA-WMSP68
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.
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 microampers.).
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 lowvoltage 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)
To Exposed Metal
Parts on Set
TABLE OF CONTENTS
1. DIAGRAMS
1-1. Note for Printed Wiring Boards and
Schematic Diagrams ............................................................ 3
1-2. Circuit Boards Location ...................................................... 3
1-3. Schematic Diagram – Main Section –................................. 5
1-4. Printed Wiring Boards – Main Section – ............................ 6
2. EXPLODED VIEWS
2-1. Front Section ....................................................................... 7
2-2. Rear Section ........................................................................ 8
3. ELECTRICAL PARTS LIST........................................... 9
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.)
0.15 µF
1.5 k
Earth Ground
(Fig. A)
AC
Ω
voltmete
(0.75 V)
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.
: LEAD FREE MARK
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 P ARTS WHOSE
PART NUMBERS APPEAR AS SHO WN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
2
SECTION 1
d
DIAGRAMS
1-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
SA-WMSP68
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• B : B– Line.
•Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : Power on
•Voltages are taken with a V OM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F : AUDIO
4
W or less unless otherwise
For printed wiring boards.
Note:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
1-2. CIRCUIT BOARDS LOCATION
MAIN board
SWITCH board
CONTROL board
POWER TRANS boar
POWER AMP board
3
SA-WMSP68
• IC BLOCK DIAGRAM
IC301 STK404-130S (POWER AMP Board)
1 2 3 4 5 6 7 8 9 10 11 12 13
4
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