DOWNLOAD Sony HCD-F250AV / MHC-F250AV Service Manual ↓ Size: 8.76 MB | Pages: 82 in PDF or view online for FREE

Model
HCD-F250AV MHC-F250AV
Pages
82
Size
8.76 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-f250av-mhc-f250av.pdf
Date

Sony HCD-F250AV / MHC-F250AV Service Manual ▷ View online

HCD-F250AV
US Model
Canadian Model
SERVICE MANUAL
MINI HI-FI COMPONENT SYSTEM
MICROFILM
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol 
a
 and “PRO
LOGIC” are trademarks of Dolby Laboratories
Licensing Corporation.
• HCD-F250AV is the tuner, deck,
CD and amplifier section in MHC-F250AV.
U.S and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
— Continued on next page —
SPECIFICATIONS
Model Name Using Similar Mechanism
HCD-F100
CD Mechanism Type
CDM-46B1
Optical Pick-up Name
KSS-213D/Q-NP
Model Name Using Similar Mechanism
HCD-RX66
Tape Transport Mechanism Type
TCM-230AWR1
CD
Section
Tape deck
Section
AUDIO POWER SPECIFICATION:
U.S.A models:
POWER5 OUTPUT AND TOTAL HARMONIC DISTORTION:
with 8 
 load both channels driven, from 70–20,000 Hz; rates 100W
per channel minimum RMS power, with no more than 0.9% total
harmonic distortion from 250 mmW to rated output.
Amplifier section
Front Speaker:
Continuous RMS power output
100 + 100 W
(8 
 at 1 kHz, 10% THD)
Total harmonic distortion
less than 0.09%
(8 
 at 1 kHz, 40W)
Center Speaker:
Continuous RMS power output
25 W
(8 
 at 1 kHz, 10% THD)
Rear Speaker
:
Continuous RMS power output
12.5 + 12.5 W
(16 
 at 1 kHz, 10% THD)
The follwing measured at AC 120/240 V, 50/60 Hz
Continuous RMS power output (Rated)
110 + 110 W
(8 
 at 1 kHz, 1% THD)
Continuous RMS power output (Reference)
130 + 130 W
(8 
 at 1 kHz, 10% THD)
Peak music power output (Reference)
1500 W
The follwing measured at AC 110/220 V, 60 Hz
Continuous RMS power output (Rated)
90 + 90 W
(8 
 at 1 kHz, 1% THD)
Continuous RMS power output (Reference)
110 + 110 W
(8 
 at 1 kHz, 10% THD)
— 2 —
Inputs
VIDEO/MD IN: (phono jacks)
voltage 250 mV / 450 mV, impedance
47 k
MIX MIC (except for Australian and European models): (phone jack)
sensitivity 1 mV, impedance
10 k
Outputs
VIDEO/MD OUT (phono jacks): voltage 250 mV impedance 1 k
PHONES (stereo phone jack):
accepts headphones of 8 
 or more
SPEAKER:
accepts impedance of 8 to 16 
REAR SPEAKER:
accepts impedance of 16 
CENTER SPEAKER:
accepts impedance of 8 
SUPER WOOFER:
Voltage 1 V, impedance 1 k
CD player section
System
Compact disc and digital audio system
Laser
Semiconductor laser (
λ
 = 780 nm)
Emission duration: continuous
Laser output
Max. 44.6 
µ
W*
*This output is the value measured at a
distance of 200 mm from the objective
lens surface on the Optical Pick-up
Block with 7 mm aperture.
Frequency response
2 Hz – 20 kHz (
±
0.5 dB)
Wavelength
780 – 790 nm
Signal-to-noise ratio
More than 90 dB
Dynamic range
More than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength:
600 nm
Output level:
–18 dBm
Tape player section
Recording system
4-track 2-channel stereo
Frequency response
40 – 13,000 Hz (
±
3 dB), using Sony
(DOLBY NR OFF)
TYPE I cassette
40 – 14,000 Hz (
±
3 dB), using Sony
TYPE II cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
2 band models:
87.5 – 108.0 MHz
3 band (FM-MW-SW) models:
87.5 – 108.0 MHz
3 band (FM-MW-LW) models:
87.5 – 108.0 MHz
Antenna
FM lead antenna
Antenna terminals
75 
 unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
2 Band type:
530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 1,710 kHz
(with the interval set at 9 kHz)
3 Band type:
MW:
531 – 1,602 kHz
(with the interval set at 9 kHz)
530 – 1,710 kHz
(with the interval set at 10 kHz)
SW:
5.95 – 17.90 MHz
(with the interval set at 5 kHz)
Antenna
AM loop antenna
Antenna terminals
External antenna terminals
Intermediate frequency
450 kHz
General
Power consumption
U.S.A. models:
250 W
Canadian models:
250 VA
Dimensions (w/h/d)
Approx. 280 
×
 375 
×
 455 mm
Mass
Approx. 12 kg (26 lbs. 7 oz.)
Supplied accessories
AM loop antenna (1)
Remote
RM-SF250AV(1)
Batteries(2)
FM lead antenna(1)
Speaker cords(5)
Front speaker pads(8)
Center speaker pads (4)
Design and specifications are subject to change without notice.
— 3 —
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 
!
 OR DOTTED LINE WITH
MARK 
!
 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.
 After correcting the original service problem, perform the following
safety checks 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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY  CHECK-OUT
To Exposed Metal 
Parts on Set
0.15 
µ
F
1.5 k
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A.  Using an AC voltmeter to check AC leakage.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 
!
 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
— 4 —
TABLE OF CONTENTS
1. GENERAL
– FRONT PANEL – ······························································· 5
– REAR PANEL – ·································································· 6
2. DISASSEMBLY
······························································· 8
3. TEST MODE
··································································· 16
4. MECHANICAL ADJUSTMENTS
···························· 18
5. ELECTRICAL ADJUSTMENTS
Deck Section ········································································ 21
CD Section ··········································································· 25
6. DIAGRAMS
6-1.
Block Diagram –CD Section– ·········································· 27
6-2.
Block Diagram –Main Section– ······································· 29
6-3.
Block Diagram –Audio Section– ····································· 31
6-4.
Circuit Boards Location ··················································· 33
6-5.
Printed Wiring Board –BD Section– ································ 35
6-6.
Schematic Diagram –BD Section– ··································· 37
6-7.
Printed Wiring Board –CD Motor Section– ····················· 39
6-8.
Schematic Diagram –CD Motor Section– ························ 41
6-9.
Printed Wiring Board –Audio Section– ···························· 43
6-10. Schematic Diagram –Audio Section– ······························ 45
6-11. Printed Wiring Board –Leaf SW Section– ······················· 47
6-12. Schematic Diagram –Leaf SW Section– ·························· 49
6-13. Printed Wiring Board –Main Section– ····························· 51
6-14. Schematic Diagram –Main (1/5) Section– ······················· 53
6-15. Schematic Diagram –Main (2/5) Section– ······················· 55
6-16. Schematic Diagram –Main (3/5) Section– ······················· 57
6-17. Schematic Diagram –Main (4/5) Section– ······················· 59
6-18. Schematic Diagram –Main (5/5) Section– ······················· 61
6-19. Printed Wiring Board –Panel Section– ····························· 63
6-20. Schematic Diagram –Panel Section– ······························· 65
6-21. Printed Wiring Board –Surround Amp Section– ·············· 67
6-22. Schematic Diagram –Surround Amp Section– ················· 69
6-23. Printed Wiring Board –Power Section– ··························· 71
6-24. Schematic Diagram –Power Section– ······························ 73
6-25. Waveforms ········································································ 75
6-26. IC Pin Function Description ············································· 76
6-27. IC Block Diagrams ··························································· 84
7. EXPLODED VIEWS
····················································· 86
8. ELECTRICAL PARTS LIST
····································· 94
SERVICING  NOTES
The laser diode in the optical pick-up block may suffer electrostatic
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 emission, observe
from more than 30 cm away from the objective lens.
LASER  DIODE  AND  FOCUS  SEARCH  OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output repeatedly.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
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.
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Sony HCD-F250AV / MHC-F250AV Service Manual ▷ Download

  • DOWNLOAD Sony HCD-F250AV / MHC-F250AV Service Manual ↓ Size: 8.76 MB | Pages: 82 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony HCD-F250AV / MHC-F250AV in PDF for free, which will help you to disassemble, recover, fix and repair Sony HCD-F250AV / MHC-F250AV Audio. Information contained in Sony HCD-F250AV / MHC-F250AV 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.