Harman kardon tu 912 service manual

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The Harman Kardon
,. Madel TU912 Manual 105A
DIGITAL SYNTHESIZED QUARTZ-LOCK TUNER

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harman/kardon
240 Crussways Park WesLWoodburyNYJ 1797
111273152105A9 P7088606 1850 aned in

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SPECIFICATIONS

Nominal Limit

0 FM SECTION
Tuning Range
50dB Quieting Sensitivity

87.5~108.0MH2

Mono 15.2(21ldBf s19l25)dBt

Stereo 38l44ldBf s41i47idBf
Usable Sensitivity 11(12ldBf 515(16id8f
Image Ratio 41de 36dB
IF Rejection 90de75dB
Spurious Response Rejection 77deGOdB
Capture Ratio 1.4dB s 2dB
Alternate Channel Selectivity 58(65)d3250(551d8
AM Rejection 57de45dB
Signal to Noise Ratio

Mono 82(7GIde 75(70)dB

Stereo 74(68)dB a 70(64IdB
Total Harmonic Distortion

Mono 0.07%SO.3%

Stereo 0.08% 50.4%

Stereo Separation at 1kHz
Output Level/Impedance (Stereo)

49(45ldB 2 40(35)dB
750(360)mV/2.2k9
0 AM SECTION

Tuning Range
Usable Sensitivity

520~1,710kH2

External Antenna 11W 5 ZOpV

Loop Antenna ZIOuV/m
Selectivity 39d8233d3
Signal to Noise Ratio 53dBa48dB
Image Rejection 110de 30dB
IF Rejection 64de 50:13

LEAKAGE TEST (FOR SERVICE ENGINEERS IN THE

17-7/16" X 2-11/16" X1473/16
(443 x 68 x 360 mm)

7.3 lbs. (3.3kg)

0 DIMENSIONS (W x H x D)

O WEIGHT
0 POWER SUPPLIES

for U.5.A. model
for General model
0 POWER CONSUMPTION

AC 120V, BOHZ
AC 220/24OV, 50/60Hz
14W

The figures in the parentheses ( I in the FM section are specifications for the
General model.

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

Specifications and components subject to change without notice, Overall per-
lormance will be maintained or improved.

U.S.A.)

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.

, Be sure that any protective devices
such as nonmetallic control knobs,
insulating fishpapers, cabinet backs.
adjustment and compartment cover
or shields, isolation resistor-capacity
networks, mechanical insulators,
etc. which were removed for servior
ing are properly reinstalled.

. 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 ALF 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
UNIT UNDER TEST

METAL SURFACE OF

SIMPSON MODEL 229 ETC. FOR
LEAKAGE TEST

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

HIGH
VOLTAGE
0R +LEAD

GROUND
LEAD

6

VTVM
.0 AC SCALEO-

1.5m
10W

y_._I\M_

_l|__

0.15uF

TEST PROBE

CONNECT TO KNOWN
EARTH GROUND

TO EXPOSED
M ETAL PARTS

resistor. (This test should be performed with the power switch in both the On and Off positionsl
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.