Harman kardon hd 7725 cd

Page 2

H D7725

CLASS 1 LASER PRODUCT
Produd complies with DHHS rules CFR subohapter J part
1040:10 at date of manufacture.

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

CAU110N - use of all controls, adjustments or pectormance of
procedures other than those specified herein may result in
hazardous radiation exposure.

CLASS 1

LASER PRODUCT

f N

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
inside the unit.

ADVARSEL:
Usynlig laserstranng ved abning nar sikkerhedsatbrydere er
ude at tunktion. Undgé udsaettelse tor straling.

VAROITUS!
Laite sisaltaa laserdiodin, joka lahettaa nakymatonta silmille
vaarallista lasersateilya.

\ J
CONTENTS
SPECIFICATIONS ------------------------------ 1 CIRCUIT DESCRIPTION ........................ 19
SAFETY PRECAUTIONS ------------------------- 2 GENERAL UNIT (EXPLODED VIEW) .............. 23
AC LEAKAGE TEST ---------------------------- 2 CD MECHANISM (EXPLODED VIEW) ............. 25
ELECTROSTATICALLY SENSITIVE DEVICES ....... 3 GENERAL PARTS LIST ________________________ 26
CONTROLS AND FUNCTIONS ................... 4 CD MECHANISM PARTS LIST _________________ 27
REMOTE CONTROL ---------------------------- 5 ELECTRICAL PARTS LIST ...................... 28
DISASSEMBLY PROCEDURES ------------------- 6 IC DIAGRAMS ................................. 33
POWER COFID REPLACEMENT .................. 7 p. c_ BOARDS _______________________________ 38
ADJUSTMENT PROCEDURE --------------------- 3 WIRING DIAGRAM ............................. 4o
TROUBLESHOOTING -------------------------- 0 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 Filter, RLS

(Real-time Linear Smoothing)

Signal Detection

Error Correction

Low Level Linearity .

Frequency Response : OdB
(20HZ to 20kHz)

Total Harmonic Distortion (THD) 0.0025%
Dynamic Range QBdB
Signal to Noise Ratio 104dB
Channel Separation . QBdB
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
' CIRC System
+/-O.5dB @-90dB

i0.5dB

:0.006%

293dB

g100dB

:90dB

2.0V i0.5V @ 10kg

0.5Vp-p 10.1 Vp-p @ 759
-15dBm radBm

A0230/240V, 50/60Hz

443mm x 103mm x 326mm

Power Consumption 22 Watts
Dimensions 173/8" x 4" x 13"
Weight 18.9lbs/8.6kg

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