Harman kardon hk 825 service manual

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The Harman Kardon

Madel hk825 ManuaINo.64A
STEREO PREAMPLIFIER

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SPECIFICATIONS Numina. Limit
Input Sensitivity/Impedance
Phono (MM) 2.2mV/47kS2 and 130pF

(MCI 130(1V/56SZ
Aux, Tuner, DAD, Tape 130mV/22kfl
Ham & Noise Ratio

Phono (MM) 80:13 2 76dB
(MC) 74d32 70dB
Aux, Tuner, DAD, Tape ezdez QOdB
Signal-to Noise Ratio (IHF-A)
Phono (MM) 84dB2 BOdB
(MC) 81dB Z 76dB
Aux, Tuner, DAD, Tape 94dB 2 sous
Channel Separation
Phono (MM) 57:13 2 50dB
(MC) ssdez 50dB
Aux, Tuner, DAD, Tape 5&3de EOdB
Overload (20 N 20kHZ)
Phono (MM) zzomv 2 zoom
(MC) 12mV 2 5mV
Aux, Tuner, DAo, Tape 1.1V 2 0.75v

This specification is the target of servicing. But, therejs a case
that the specification is not applicable to the measurement
condition and instrument)

LEAKAGE TEST

Nominal Limit
THD at 2V Output (1kHz)
Phono (MM) 0.005%: 0.01%
(MC) 0.008% S 0.02%
Aux, Tuner, DAD, Tape 0.005%5 0.01%
Frequency Response at -3dB 0.1 Hz ~ 200kHz
Output Level

Rated 1V
Maximum 10V
High Cut Filter at GkHz ~3dB t idB
Subsonic Filter at 15Hz -3dB iv 1dB
Tone Control Characteristics
Bass at 50Hz
Boost 10613 i 2dB
Cut 10dB i 2dB
Treble at lOkHz
Boost 10dB it 2dB
Cut IOdB i 2dB
Dimensions (W x H x D) 443 x 103 x 351 mm
Weight 5.8 kg
Power Supply AC 120V, BOHZ
Power Consumption 45W

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

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 devices
such as nonmetallic control knobs,
insulating fishpapers, cabinet backs,
adjustment and compartment cov-
ers or shields, isolation resistor»
capacity networks, mechanical in-
sulators, etc. which were removed
for servicing are properly reinstalled.

3. Be sure that no shock hazard exists; check for leakage
current using Simpson Model 229 Leakage Tester,
standard equipment item No. 21641, RCA Model
WT540A or use alternate method as follows:

Plug the AC line cord directly into a 120-volt 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 0.15mf capacitor, in
series with all exposed metal cabinet parts and a
known earth ground, such as a water pipe or conduit.
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 resistor
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.)

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,

TO EACH EXPOSED
METAL SURFACE OF
UNIT UNDER TEST

SIMPSON MODEL 229 ETC. FOR
LEAKAGE TEST

TO Ac GROUND SUCH
AS WATER 0R GAS PIPE,
BX CABLE, CONDUIT, ETC.

HlGH GROUND

VOLTAGE LEAD
0R 4 LEAD
VTVM
-OAc SCALE 0-

1.5KOHM
10W

ViA

___._II_

0.15 MF

TEST PROBE

TO EXPOSED
METAL PARTS

CONNECT TO KNOWN
EARTH GROUND