Harman kardon ap 2500 service manual

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The Harman Kardon

Model AP2500 Manama
STEREO PREAMPLIFIER

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harmen/kardon AP2500

The following marks found in the parts list of this manual
identify the models as follows.

{ED : North America area model Black version

QB : International model Black version

CONTENTS

SPECIFICATIONS .................... 2 GENERAL UNIT AND PARTS LIST .............. 5

LEAKAGE TEST ........ 2 P. C. BOARDS ............................. .6
DISASSEMBLY PROCEDURES .. ...3 ELECTRICAL PARTS LIST .. ....7
POWER CORD REPLACEMENT. 3 SCHEMATIC DIAGRAMS ., 11
CONTROLS AND FUNCTIONS .................... 4 WIRING DIAGRAM ..................................... 13
harman/kardon

Parts and Servzce Office
240 Crossways Park West,Woodbury.N Y 11797
111270500A152 KSSOB-1 1500 Printed in Japan

OOSZdV

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AP2500

SPECIFICATIONS

Input Sensitivity
(at 1V output. 1kHz)
CD, Aux, Tuner, Video, Tape

Nominal Limit

Normal 134mV 135th15mV/35 kohm
Gain -10dB 453mV 450mV:15mV
Phono (MC) 120.0uV lZBpVi-lOuV/SB kohm
Phono (MM) 2.2mV 2.2mV10.2mV/49kohm
Frequency Response
l-3dB down)
Normal 0.2Hz - 380kH2 0.25Hz - 350kHz
Gain ~10dB 0.2Hz - 510kHz 0.25Hz - 450kHz

Input Overload Level
(at lkHz, THU 01%)

Phono (MC) 8.8mV > 5.5mV

Phone (MM) 154.0m > 150mV
Signal to Noise Ratio

(IHF A)

CD, Aux, Tuner. Video, Tape 105GB > 95 dB

Phono (MC) 78.0 dB > 74.0d8

F'hono (MM) 81.0dB > 75.0dB

Nominal Limit

Channel Separation

(at IDkHz)

CD, Aux, Tuner, Video, Tape 66.0 dB > 50.0 dB

Phono (MC) 65.0 dB > 55.0 dB

Phono (MM) 65.0 dB > 60.0 dB
Harmonic Distortion

(at 1V, 1 kHz)

Normal 0.0067%< 0.01%

Gain -10dB 0.0036%< 0.01%
RIAA Equalization

(at Tape out)

20Hz -20kHz 0 dB:0.5 dB
DIMENSIONS 17.4" x 4.1" x13.7

(WxHxD) (443x105x347 mm)
WEIGHT 12.8lbs/5.8kg
POWER SUPPLY

North America area model
International model

ACIZOV, 60 Hz
AC230/240V, 50/60HZ

POWER CONSUMPTION 25W

These specifications are service target specs.

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

LEAKAGE TEST (FOR SERVICE ENGINEERS IN THE USA)

Before returning the unit to the user, perform the following safety checks:

1. Inspect all lead dress to make cer-
tain that leads are not pinched or
that hardware is not lodged be-
tween the chassis and other metal
parts in the unit.

2. Be sure that any protective de-
vices such as nonmetallic control
knobs, insulating fishpapers,
cabinet backs, adjustment and
compartment covers or shields,
isolation resistor-capacity net-
works, mechanical insulators, etc.
which were removed for servicing
are properly reinstalled.

3. Be sure that no shock hazard exists; check for leak-
age current using Simpson Model 229 Leakage
Tester, standard equipment item No. 21641, RCA
Model WT540A or use alternate method as follows:
Plug the power cord directly into a 120»vo|t AC
receptacle (do not use an Isolation Transformer for
this test). Using two clip leads, connect a 1500 Ohm,
lO-watt resistor paralleled by a 0.15 uF capacitor, in
series with all exposed metal cabinet parts and a
known earth ground, such as a water pipe or con-
duit. Use a VTVM or VOM with 1000 Ohms per volt,
or higher sensitivity to measure the AC voltage drop
across the resistor. (See Diagram.) Move the resis-
tor connection to each exposed metal part having a
return path to the chassis (antenna, metal, cabinet,
screw heads, knobs and control shafts. escutcheon,
etc.) and measure the AC voltage drop across the
resistor. (This test should be performed with the
power switch in both the On and Off positions.)

TO EACH EXPOSED
METAL SURFACE OF
UNIT UNDER TEST

SIMPSON MODEL 229 ETC. FOR
LEAKAGE TEST

TO AC GROUND SUCH
AS WATER PIPEBX CABLE,
CONDUIT, ETC

HIGH GROUND

VOLTAGE LEAD
on +LEAD
VTVM
.0 AC SCALE 0-

l,5l<fl
10W

VVV

___l|_

0,15uF

TEST PROBE

CONNECT TO KNOWN
EARTH GROUND

TO EXPOSED
METAL PARTS

A reading of 0.35 volt RMS or more is excessive and indicates a potential shock hazard which must be corrected

before returning the unit to the owner.