Motorola M3000 Service Manual

SAFETY WARNING
CAUTION: NO WORK SHOULD BE ATTEMPTED ON AN EXPOSED MONITOR CHASSIS BY ANYONE NOT
FAMILIAR WITH SERVICING PROCEDURES AND PRECAUTIONS.
1. SAFETY PROCEDURES should be developed by
habit so that when the technician is rushed with re-
pair work, he automatically takes precautions.
2. A GOOD PRACTICE, when working on any unit,
is to first ground the chassis and to use only one
hand when testing circuitry. This will avoid the pos-
sibility of carelessly putting one hand on chassis or
ground and the other on an electrical connection
which could cause a severe electrical shock.
3. Extreme care should be used in HANDLING THE
PICTURE TUBE as rough handling may cause it to
implode due to atmospheric pressure (14.7 lbs. per
sq. in.). Do not nick or scratch glass or subject it to
any undue pressure in removal or installation. When
handling, safety goggles and heavy gloves should be
worn for protection. Discharge picture tube by
shorting the anode connection to chassis ground (not
cabinet or other mounting parts). When discharging,
go from ground to anode or use a well insulated piece
of wire. When servicing or repairing the monitor, if
the cathode ray tube is replaced by a type of tube
other than that specified under the Motorola Part
Number as original equipment in this Service Manual,
then avoid prolonged exposure at close range to un-
shielded areas of the cathode ray tube. Possible dan-
ger of personal injury from unnecessary exposure to
X-ray radiation may result.
4. An ISOLATION TRANSFORMER should always
be used during the servicing of a unit whose chassis is
connected to one side of the power line. Use a trans-
former of adequate power rating as this protects the
serviceman from accidents resulting in personal injury
from electrical shocks. It will also protect the chassis
and its components from being damaged by acci-
dental shorts of the circuitry that may be inadver-
tently introduced during the service operation.
5. Always REPLACE PROTECTIVE DEVICES, such
as fishpaper, isolation resistors and capacitors and
shields after working on the unit.
6. If the HIGH VOLTAGE is adjustable, it should al-
ways be ADJUSTED to the level recommended by
the manufacturer. If the voltage is increased above
the normal setting, exposure to unnecessary X-ray
radiation could result. High voltage can accurately be
measured with a high voltage meter connected from
the anode lead to chassis.
4-16
7. BEFORE RETURNING A SERVICED UNIT, the
service technician must thoroughly test the unit to be
certain that it is completely safe to operate without
danger of electrical shock. DO NOT USE A LINE
ISOLATION TRANSFORMER WHEN MAKING
THIS TEST.
In addition to practicing the basic and fundamental
electrical safety rules, the following test, which is re-
lated to the minimum safety requirements of the
Underwriters Laboratories should be performed by
the service technician before any unit which has been
serviced is returned.
__.1000 OHM/VOLT {OR HIGHER) AC VOLTMETER
NOTES' 1. REPEAT EACH CHECK WITH THE LINE CORD
REVERSED IN THE POWER OUTLET.
2 METER READING MUST NOT EXCEED
7% VOLTS AC.
"HOT" LEAO OF METER TO EACH
EXPOSED PART OF CABINET.
AS WELL AS THE CABINET
GROUND LEAD OF METER TO ANY EARTH
GKOUND SUCH AS A COLD WATER PIPE '
~~
Voltmeter Hook-up for Safety Check
A 1000 ohm per volt AC voltmeter is prepared by
shunting it with a 1500 ohm, 10 watt resistor. The
safety test is made by contacting one meter probe to
any portion of the unit exposed to the operator such
as the cabinet trim, hardware, controls, knobs, etc.,
while the other probe is held in contact with a good
"earth" ground such as a cold water pipe.
The AC voltage indicated by the meter may not ex-
ceed 71/2 volts. A reading exceeding 71/2 volts indicates
that a potentially dangerous leakage path exists be-
tween the exposed portion of the unit and "earth"
ground. Such a unit represents a potentially serious
shock hazard to the operator.
The above test should be repeated with the power
plug reversed, when applicable.
NEVER RETURN A MONITOR which does not pass
the safety test until the fault has been located and
corrected.

Motorola M3000 Specifications

General

Brand	Motorola
Model	M3000
Category	Cordless Telephone
Language	English