Harman kardon tu 920 service manual

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The Harman Kardon

A Model TU920
ACTIVE TRACKING TUNER

Manual 117A

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

«as : North America area model

(in. : North America area model Black version
0 : General model

(3:. : General model Black version

harman/kardon

240 Crossways Park West.Woodbury, N,Y.1 7797
lll2r3l52117A1 P7088709 1500 Prlmed In Japan

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SPECIFICATIONS

OFM SECTION
Tuning range

Nominal Limit

87.5~108.0MH2
50dB Quieting Sensitivity

Mono 14.2dBf§19dBf

Mono for active tracking 14.7dBfg19dBf

Stereo 38.2dBfg41dBf
Usable Sensitivity 1 1.7dBf§15dBf
Image Ratio 49dB g40dB
IF Rejection 92ng75dB
Spurious Response Rejection 94dB
Capture Ratio 1.5dB g 2dB
Alternate Channel Sensitivity 60dB g 50dB

for active tracking 75dB ; 65dB
AM Rejection 59dB ; 49dB
Signal to Noise Ratio

Mono 80:18 ; 75dB

Stereo 73dB g 68dB
Total Harmonic Distortion

Mono 0.09% g0.3%

Mono for active tracking 0.28% g0.5%

Stereo 0,13%§O.4%

0.3% §O.8%
52ng40dB
32ng28dB
750mV/2.2k9

Stereo for active tracking
Stereo Separation at 1 kHz

for active tracking
Output Level/Impedance (Stereo)

0 AM SECTION
Tuning range
Usable Sensitivity

Nominal Limit

520~1,710kHz

External Antenna 14,4V g ZOuV
Loop Antenna 360uV/m § 700uV/m
Selectivity 33dB; 26dB
Signal to Noise Ratio 53ng48dB
Image Rejection 40dB ; 30dB
IF Rejection 66dB ; 50dB
O DIMENSION 17»7/16"X2-11/16x14-3/16
IWXHXD) (443x68x360 mm)
I WEIGHT 7.3 lbs.l3.3 kg)

0 POWER SUPPLIES
for North America area model
for General modle

AC 120V, 60Hz
AC 220/24OV, 50/60Hz

.POWER CONSUMPTION 14W

This specification is the target of servicing. But, there is a care 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 USA.)

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

1. Inspect all lead dress to make certain
that leads are not pinched or that
hardware is not lodged between
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 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
WT54OA 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 I: 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 EACH EXPOSED
METAL SURFACE OF
UNIT UNDER TEST

LEAKAGE TESTER

T0 AC GROUND SUCH

HIGH
VOLTAGE
0R + LEAD

GROUND
LEAD

6

VTVM
0 AC SCALE 0"

CONDUIT, ETC.

1.5 k!)
10W

TEST PROBE

TO EXPOSED
METAL PARTS

CONNECT TO KNOWN
EARTH GROUND

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.

AS WATER PIPE, BX CABLE,