3
Safety Instructions
Important Safety Notice
Many electrical and mechanical parts in this chassis have special safety-related characteris-
tics.
These parts are identified by in the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components
as
recommended in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet. Do not use a line Isolation Transformer during this
check. Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known
good earth ground (Water Pipe, Conduit, etc) and the exposed metallic parts. Measure the AC
voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity.
Reverse plug of the AC cord into the AC outlet and repeat AC voltage measurements for each
exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS, which is, cor-
responds to 0.5mA. In case any measurement is out of the limits specified, there is possibili-
ty of shock hazard and the set must be checked and repaired before it is returned to the cus-
tomer.
AC Volt-meter
To instrument’s
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
0.15uF
1.5Kohm/10W
