Harman kardon hd 7725 service manual

Page 1

The Harman Kardon

Model HD7725

Manual A

COMPACT DISC PLAYER

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0 : General Model
® : General Model Block Version

harman/kardon

240 Crossways Park West. Woodbury, N. Y. 11797
1112-HD7725-A P9307 1200 Printed in USA

Page 2

CLASS 1 LASER PRODUCT
Product complies with DHHS rules CFR subchapter J part
1040:10 at data of manufacture.

DANGER - invisible laser radiation when open and inteIIod< failed
or defeated. Avoid direct exposure to the beam.

CAUI10N - use of all controls, adiuslmens or performance of
procedures other than those specified herein may result in
hazardous Iadiation exposure.

CLASS 1

LASER PRODUCT

Be careful of the Laser Pickup.
Although you cannot see it from the outside, a laser

pickup is located under the disc tray and a precision
lens is built in it.

Since the laser pickup, including the lense element,
is especially sensitive to dust, keep the disc tray
closed when not in use. Also do not put your hand
insidethe unit.

ADVARSEL:
Usynlig laserstréling ved abning nér sikkerhedsafbrydere er
ude af funktion. Undgé udszettelse for straling.

VAROITUS!
Laite siséltaa laserdicdin, joka Iéihettéia nékymatonta silmille
vaarallista lasersateilyé.

L J
CONTENTS
SPECIFICATIONS .............................. 1 CIRCUIT DESCRIPTION IIIIIIIIIIIIIIIIIIIIIIII 19
SAFETY PRECAUTIONS ------------------------- 2 GENERAL UNIT (EXPLODED VIEW) .............. 23
AC LEAKAGE TEST ---------------------------- 2 co MECHANISM (EXPLODED VIEW) ............. 25
ELECTROSTATICALLY SENSITIVE DEVICES ....... 3 GENERAL PARTS LIST ________________________ 26
CONTROLS AND FUNCTIONS ------------------- 4 co MECHANISM PARTS LIST ................... 27
REMOTE CONTROL ---------------------------- 5 ELECTRICAL PARTS LIST ...................... 23
DISASSEMBLY PROCEDURES ................... e .C DIAGRAMS ................................. 33
POWER CORD REPLACEMENT .................. 7 p_ c. BOARDS ______________________________ 38
ADJUSTMENT PROCEDURE ..................... 8 WIRING DIAGRAM llllllllllllllllllllllllll 40
TROUBLESHOOTING -------------------------- 10 SCHEMATIC DIAGRAM ......................... 41
IC FUNCTIONS ............................... 14
SPECIFICATIONS

Nominal Limit
System : Compact Disc Digital Audio

D/A Converter

: Dual 18 Bit Linear D/A Converters, BFs Digital Fllter, RLS

(Real-time Linear Smoothing)

Signal Detection
Error Correction
Low Level Linearity

CIRC System

Frequency Response odB
(20Hz to 20kHz)
Total Harmonic Distortion (THD) 0.0025%
Dynamic Range SBdB
Signal to Noise Ratio 104dB
Channel Separation SBdB
Line Output Level/Impedance 2.0V
Digital Output Level/Impedance
Coaxial 0.5Vp-p
Optical -15dBm

Power Supply
U.S.A. and Canada models
International, Australia and
Asia/Oceania models

AC120V, 60HZ

: a-Beam Semiconductor Optical Laser Pickup

+/-0.5dB @ -90dB

i0.5dB

é0.006%

gQBdB

g100dB

EQOdB

2.0V 10.5V @ 1DkQ

0.5Vp-p :0.1Vp-p @759
~15dBm :SdBm

A0230/240V, 50/60HZ

443mm x 103mm x 326mm

Power Consumption 22 Watts
Dimensions 173/5" x 4" x 13"
Weight 18.9lbs/8.6kg

Specifications and components subject to change without notice. Overall performance will be maintained or improved.