Harman Kardon HK3400 - LEAKAGE TEST; POWER CORD REPLACEMENT; LEAKAGE TEST (FOR SERVICE ENGINEERS IN THE U.S.A.); POWER CORD REPLACEMENT (FOR SERVICE ENGINEERS OTHER THAN NORTH AMERICA)

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- SIMPSON MODEL 229 ETC. FOR
LEAKAGE TEST
tain that leads are not pinched or
that hardware is not lodged be- TO EACH EXPOSED TO AC GROUND SUCH
tween the chassis and other metal METAL SURFACE OF aii Coe el eee CABLE,
. : UNIT UNDER TEST H GROUND ,
parts
in
the
unit.
VOLTAGE
LEAD
2. Replace all protective devices such OR +LEAD
as nonmetallic control knobs, in-
sulating fishpapers, cabinet backs,
adjustment and compartment cov-
ers or shields, isolation resistor-
capacitor networks, mechanical in-
sulators, etc.
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 AC line 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 4F
capacitor, in series with all exposed metal cabinet parts and a
known earth ground, such as a water pipe or conduit. Use a VTVM TO EXPOSED CONNECT TO KNOWN
or VOM with 1000 ohms per volt, or higher sensitivity to measure METAL PARTS EARTH GROUND
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.)
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.
VTVM
OQ AC SCALEQ
TEST PROBE
POWER CORD REPLACEMENT (FOR SERVICE ENGINEERS OTHER THAN NORTH AMERICA)
In order to prevent file or shock hazard when replacing the power cord, follow the procedure below to replace the parts with
the standard supply parts.
PI
CABINET
BACK
POWER CORD
Sy
HOLDER