Harman kardon td 420 service manual

Page 2

SPECIFICA TlONS

Track Configuratin

- MECHANICAL SECTION
Record/Playback Tape Speed
Drift 4.75cm/sec.
Wow and Flutter(WTD)

Take Up Torque
Back Tension
F.FWD Torque
FlEW Torgue
F.FWD/HEW Time
(C-BO Tape)

- AMPLlFlEFl SECTION
Bias Frequency
Playback Output(10K £2)
Signal-to-Noise Ftaito

at Line input
(input 1kHz, 100mV)
lHF-A WTD at Dolby Level
Dolby NFI off
LN
CrOz
Metal
Dolby NFI
LN
CFO:
Metal
Dolby C NR
LN
CFO:
Metal

Nominal limit
4-track 2 Channel Stereo
Cassette Deck

02% i 2.0%
0.05%(NAB)S0.1%
0.07%(CCIFI)

SOgr - cm 35~709r ~ cm
Agr - cm 2~69r - cm
100g - cm 70~1509r - cm
100g - cm 70~1509r ~ cm
90sec. S 1 iOsec.

105kH2 i 5kHz
640mV i 1 .5dB

51 dB

54dB

54dB

61dB

64dB S 60dB
64dB S GOdB
66d8

70dB S 66dB
70dB S 66dB

Nominal Limit
Channel Separation 45dB 2 35dB
Crosstalk 70dB 2 50dB
Record/Playback Distortion
(input 1kHz)
LN 0.9% S 2.0%
CrO; 1.5% S 2.5%
Metal 1.3% S 2.5%
MPX filter Attenuation
at 15kl-lz 0.3dB S 1dB
at 19kHz 35dB S 30:13
Erase Ratio(input BOHz)
LN 70:18 2 60dB
Metal 61 dB 2 56dB
input Sensitivity 45mV 40(min)~ lOO(max)mV
(input 1kHz)at Line input
input impedance 22k£2 19(min) ~30(max)k 9
(input 1kHz)at Line input
. DIMENSIONS(W>< H x D) 17-3/ "><5"><12-5/8"
(442 X 126 X 820mm)
- WEIGHT 5.4 kg

POWER SUPPLY
USA. and Canada models
international

AC12OV. GOHz Gib
AC230V, 50/60Hz o 113

~ POWER CONSUMPTION
USA. and Canada models
International and Australia models

TSWGD
16W 03

These specifications are service target specs.
Specifications and components are 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. Replace all protective devices such as non-
metallic control knobs. insulating flshpapers.
cabinet backs. or shields. isolation resistor-

capacltor networks.

eat.

3. Be sure that no shock hazard existszcheck for leakage current
using Simpson Model 229 Leakage Tester. standard equipv

mechanical insulators.

TO EACH EXPOSED
METAL SURFACE OF
UNIT UNDER TEST

SIMPSON MODEL 229E, FOR
LEAKAGE TEST

ment item No.21641, FICA Model WT54OA or use alternate

method as follows:

Plug the AC line cord directly into 120evolt AC receptacietdo not
use an isolation Transformer for this test). Using two clip leads.
connect 3 1500mm. 10-watt resistor paralleled by a 0.15u F ca-
pacitor. 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. esoutcheon, 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 AC GROUND SUCH
As WATER PIPE, Bx CABLE.
HIGH GROUND CONDUIT. ETC.
VOLTAGE LEAD
OR+LEAD
VTvM
-OAC SCALE 0-
1.51m
10w
VW
0.15,»:
TEST PROBE
TO EXPOSED CONNECT To KNOWN

METAL PARTS EARTH GROUND

A reading of 0.35 volt HMS or more is excessive and indicates a potential shock hazard which must be corrected before returning

the unit to the owner.

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