Harman kardon tu 905 service manual

Page 2

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SPECIFICATIONS

OFM SECTION Nominal Limit
Tuning Range 87.3 ~ 108.4 MHz
50dB Ouieting Sensitivity

Mono 15.2dBf S 18dBf
Stereo 36.2dBf S 40dBf
Usable Sensitivity IO.2dBf(|HF) S 15dBf
Image Ratio 56dB 2 soils
IF Rejection 83dB 2 70dB
Spurious Response Rejection 88dB Z GDdB
Capture Ratio 1.1oe s 2.0dB
Alternate Channel Selectivity 72dB Z 55dB
AM Rejection 54dB 2 45dB
Signal to Noise Ratio
for U.S.A. 8: Canada models
Mono 82dB 2 75dB
Stereo 73dB 2 mm
for General model
Mono 76.5dB 2 69dB
Stereo 67.5dB Z 64dB
Total Harmonic Distortion
Mono 0.09% S 0.2%
Stereo 0.15% S 0.3%
Stereo Separation at 1kHz
for U.s.A. & Canada models 53dB Z 45dB
for General model 53dB 2 40:13

Output Level/Impedance (Stereo) 775mV/2.2kfl

0AM SECTION Nominal Limit
Tuning Range 515 ~1,680 kHz
Usable Sensitivity
External Antenna IOpV S 20pV
Loop Antenna 280/4V/m
Selectivity 42dB Z 35dB
Signal to Noise Ratio 53dB 2 50113
Image Rejection 44dB 2 38dB
IF Rejection 67dB 2 50dB
ODIMENSIONS (w x H x D) 17-1/2"x2-11/16"x14-1 1/16"
(443 x 68 x 372 mm)
OWEIGHT 7 lbs. 11 oz. (3.5 kg)

CPOWER SUPPLIES
for U.s.A. & Canada models AC120V, 60Hz
for General model AC 100/120/220/240V,
50/60Hz
.POWER CONSUMPTION 15W

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

The FM section modulation is 100% for U.s.A. and Canada models
and 53% for General model.

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.)

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 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 0.15uF 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, 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 ETCi FOR
LEAKAGE TEST

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

HIGH
VOLTAGE
0R +LEAD

GROUND
LEAD

7%

vrvm
.0 AC SCALEQ

1.5kn
10W

WV

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015uF
TEST PROBE
TO EXPOSED CONNECT TO 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.