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harman/kardon HK 3490/230 Service Manual
harman/kardon Service Manual
HK 3490/230
2 x 120W STEREO RECEIVER
CONTENTS
LEAKAGE CHECK 2 EXPLODED VIEW AND PARTS 13
ESD WARNING 3 ELECTRICAL PARTS LIST 14
TECHNICAL SPECIFICATIONS 4 SEMICONDUCTOR PINOUTS 34
TROUBLESHOOTING GUIDE 5 PCB DRAWINGS 58
FRONT PANEL CONTROLS 6 BLOCK DIAGRAM 64
REAR PANEL CONNECTIONS 7 WIRING DIAGRAM 65
PACKAGE LIST AND PARTS 8 AMP BIAS ADJUSTMENT 66
DISASSEMBLY 9 SCHEMATIC DIAGRAMS 67
Released EU2008 harman/kardon, Inc. Rev 0, 09/2008
250 Crossways Park Dr.
Woodbury, New York, 11797
Page 1 of 70
harman/kardon HK 3490/230 Service Manual
SAFETY PRECAUTIONS
The following check should be performed for the continued
protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground (water
pipe, conduit, etc.) by connecting a leakage current tester
between the earth ground and all exposed metal parts of the
appliance (input/output terminals, screwheads, metal
overlays, control shaft, etc.). Plug the AC line cord of the
appliance directly into a 120V AC 60Hz outlet and turn the
AC power switch on. Any current measured must not exceed
o.5mA.
Reading should
not be above
Leakage
0.5mA
Device current
under tester
test
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter Earth
plug as required) ground
AC Leakage Test
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A
POTENTIAL SHOCK HAZARD AND MUST BE
CORRECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.
Page 2 of 70
harman/kardon HK 3490/230 Service Manual
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and
semiconductor "chip" components.
The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on
your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to
prevent electrostatic charge build-up or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges
sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical change sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement
ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material.)
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the
chassis or circuit assembly into which the device will be installed.
CAUTION : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together
or your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES devices.
Each precaution in this manual should be followed during servicing.
Components identified with the IEC symbol in the parts list are special significance to safety. When replacing a component identified with
, use only the replacement parts designated, or parts with the same ratings or resistance, wattage, or voltage that are designated in the
parts list in this manual. Leakage-current or resistance measurements must be made to determine that exposed parts are acceptably
insulated from the supply circuit before retuming the product to the customer.
2
Page 3 of 70
harman/kardon HK 3490/230 Service Manual
Technical Specifications
Audio Section FM Tuner Section
Stereo Mode Frequency Range 87.5