Mitsubishi Electric HS-U449 Service Manual page 6

2. Hot Check
The test sequence, with reference to the measuring
circuit in the figure is as follows:
(1) With switch S1 open, connect the VCR to the measuring
circuit. Immediately after connection, measure the
leakage current using both positions of switch S2 and
with the switching devices in the VCR in all of their
operating positions.
120V
S1
AC Leakage Test
Avoid shock hazards. Do not connect this VCR to a TV
antenna, cable or accessory that exhibits excessive leakage
currents. If available, the television instrument or cable to
which this VCR is connected should have the antenna cold
check and leakage current hot check performed.
PRECAUTIONS
Handling and storage
• Avoid using the VCR in the following places:
- extremely hot, cold or humid places,
- dusty places,
- near appliances generating strong magnetic fields,
- places subject to vibration,
- poorly ventilated areas.
• Be careful of moisture condensation.
• If you pour a cold liquid into a glass, water vapor in the air
will condense on the surface of the glass. This is called
moisture condensation.
• Moisture condensation on the head drum, one of the
most critical parts of the VCR, will cause damage to the
tape.
• The VCR is equipped with a moisture condensation
prevention circuit. This circuit operates only when the unit
is attached to an AC outlet.
• Handle the VCR carefully.
• Do not block the ventilation openings.
• Do not place anything heavy on the recorder.
• Do not place liquids on the top cover of the recorder.
• Use the Recorder in horizontal (flat) position only.
S2
GH
(GROUNDING)
OPEN
GROUNDING SUPPLY CONDUCTOR
- 2 -
(2) Close switch S1, energizing the VCR, and immediately
after closing the switch, measure leakage current using
both positions of switch S2, and with the switching
devices in the VCR in all of their operating positions.
Repeat the current measurements of items (1) and (2)
after the VCR has reached thermal stabilization. The
leakage current should not be more than 0.5 mA.
VCR
• Avoid violent shocks to the recorder during packing and
transportation.
• Before packing, be sure to remove the cassette from the
recorder.
AC MILLIAMMETER
A
INSULATING
TABLE
B