Harman kardon tu 915 service manual

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The Harman Kardon ,
,* MOdel TU915 Manual No.77A
DIGITAL SYNTHESIZED QUARTZ-LOCKED TUNER

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240 CROSSWAYS PARK WES'L woonmmv, N v 11791
1112H15277AI P058118 1850 PRINTED IN JAPAN

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a SPECIFICATIONS
OFM SECTION Nominal Limit 0AM SECTION Nominal Limit
Tuning Range 87.5 ~ 108.0MH2 Tuning Range 520 ~1,710kHz
SOdB Quietlng Sensitivity Usable Sensitivity
Mono 15.2dBfé 18dBf External Antenna 10/1V S ZOMV
Stereo 36.2dBfS 40dBf Loop Antenna 220uV/m C
Usable Sensitivity 10.6dBf (IHF) S 15dBf Selectivity 54dB 235m;
Image Ratio 98dBZ SOdB Signal to Noise Ratio 54dB 2 SOdB
lF Rejection 105:de 85dB Image Rejection 4BdB 2 38dB
Spurious Response Rejection 120dBZ 95dB IF Rejection GQdB 2 SOdB
Capture Ratio 1.0dB S 2.0dB . _ n _ .. _ ,,
Alternate Channel Selectivity 70dl32 SOdB D'MENSIONSWXHXD) (L/23 $81 1)" 133221;: 1 6
AM Rejection 64dB2 45dB
Signal to Noise Ratio OWEIGHT 8 lbs. 6 oz. (33 kg)
for U.S.A. & Canada models .pOWER SUPPLIES
M°n° 33d3§ 73 ror U.S.A. & Canada models ACI 20v, 60Hz
Stem 75dB 70dB for General model AC100/120/220/240V,
for General model 2 50/60Hz
M 77d 72dB
~ Stir; 69,132 64,; oPOWER CONSUMPTION 16W
_ Total Harmonic Distortion
Mono 0.05% S 0.15%
Stereo 005% g 0.3% This specification is the target of servicing. But, there is a case
Stereo Separation at 1kHZ thatdthe spacification is not applicable to the measurement
, for u.s.A. & Canada models 65dB 2 45dB m ° a tmmem' , {r
; for General model 55dB 2 40dB Specifications and components subject to change without notice. \1 .

Output Level/Impedance (Stereo)
for U.S.A, & Canada models
for General model

780mV/2.2kfl
420mV/2.2kfl

Overall performance will be maintained or improved.

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

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
forservicing are properly reinstalledt

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 0.15pF capac-
itor, 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, escutchecn,
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

T0 AC GROUND SUCH
AS WATER OR BX CABLE,
CONDUIT, ETC.

HIGH

VOLTAGE LEAD
on +LEAD
VTVM
-OAC SCALE 0-
1i5kfl
10W
NM.
0.15;:
TEST PROBE L
To EXPOSED CONNECT T0 KNOWN

METAL PARTS EARTH GROUND

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.