Harman kardon hk 495 i service manual

Page 2

i

hk49

SPECIFICATIONS

0 FM SECTION Nominal Limit
Tuning Range 87.5 - 108.0 MHz
50dB Quieting Sensitivity

Mono 15.7dst19dBf
Stereo 37dBf s 41dBf
Usable Sensitivity 10.7dBf515dBf
Image Ratio 42dB2 36dB
IF Rejection 94de75dB

Spurious Response Rejection 74dB ZGOdB
Capture Ratio 1.25stZdB
Alternate Channel Selectivity 623de 50dB

AM Rejection 57de45dB
Signal to Noise Ratio
Mono 82de75dB
Stereo 75dB 2 70dB
Total Harmonic Distortion
Mono 0.07% s 0.3%
Stereo 0.06% 50.4%
Stereo Separation at 1kHz 53de40dB

0 AM SECTION
Tuning Range
Usable Sensitivity

520~1,710kHz

External Antenna 11W 5 ZOpV

Loop Antenna 240uV/m
Selectivity 39dB z 33dB
Signal to Noise Ratio 54dBZ48dB
Image Rejection 40dB a 35dB
IF Rejection 62dB z SOdB
0 AUDIO SECTION
Usable Sensitivity

Video/CD 135mV :i: 25mV

Phono 2.2mV : 0.3mV
Signal to Noise Ratio

Video/CD 82dB 2 78dB

Phono SOdB 2 72dB

Nominal Limit
Channel Separation at 10kHz
Video/CD 52dB Z 43dB
Phono 57de45dB
IM Distortion Ratio O.1%50.2%
RMS Output Power 50W 245W

89, 1kHz, THD 0.09%
Damping Factor at 1kHz 702 60
Tone Control Characteristics

Bass at 50Hz

Boost 10dB a: 2dB
Cut - 10dB a: 2dB
Treble at 10kHz
Boost 10dB 2 2dB
Cut - 10dB a: 2dB
Loudness Control
at 10kHz 3dBtldB
at 50Hz 10dB a: 2dB
DC Output Voltage
L channel OmV d: 60mV
R channel OmV :I: 60mV
RIAA Equalization at
Tape Out 1.2dB :3}; dB/0.3dB :50 dB
(20H2/20kHzl

C DIMENSIONS (W x H x D) 17-1/2" x 4-1/16" x 14-1/2"
(443 x 103 x 368 mm)

. WEIGHT 15le 7oz 17kg)
. POWER SUPPLY AC120V, 60Hz
. POWER CONSUMPTION 220W

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

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

LEAKAGE TEST (FOR SERVICE ENGINEERS IN THE U.S.A.l

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

SIMPSON MODEL 229 ETC. FOFI
LEAKAGE TEST

1, Inspect all lead dress to make cenain
that leads are not pinched or that
hardware is not lodged between

the chassis and other metal parts TO EACH EXPOSED
METAL SURFACE OF
2. Be sure that any protective devices UNIT UNDER TEST

in the unit.

such as nonmetallic control knobs,
insulating fishpapers, cabinet backs,
adjustment and compartment covers
or shields, isolation resistor-capacity
networks, mechanical insulators,
etc. which were removed for servic-
ing 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 power 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, 10-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 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

TO AC GROUND SUCH
AS WATER PIPE, BX CABLE,
CONDUIT, ETC.

HIGH
VOLTAGE
OH + LEAD

GROUND
LEAD

6

VTVM
.0 AC SCALEO-

1.5m
10W

VVV

HI-

0-I5MF

TEST PROBE

CONNECT TO KNOWN
EARTH GROUND

TO EXPOSED
METAL PARTS

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.