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WARNING: X-RADIATION

X-RADIATION CAN BE CAUSED IF CRITICAL

COMPONENTS ARE REPLACED BY NON-CONFORM
COMPONENTS. THESE COMPONENTS ARE MARKED IN
THIS SERVICE MANUAL BY AN * .

WARNING: SAFETY

ELECTRIC SHOCK OR FIRE HAZARD CAN BE
CAUSED IF CRITICAL COMPONENTS ARE REPLACED

BY NON-CONFORM COMPONENTS. THESE

COMPONENTS ARE MARKED IN THIS GUIDE BY A ,L SIGN.

REPLACE WITH CONFORM TYPES ONLY !

1. Comply with all caution and safety-related notes on or inside the
instrument cabinet, on the chassis, or on the picture tube.

2. When service is required, maintain correct lead dress and parts
placement. Extra precaution should be taken to assure proper lead
dress in the High Voltage circuit area.
Where a malfunction has occurred, those components or drcuits that
indicate evidence of abnormality should be replaced or corrected.
Always use the manufacturer's safety specified replacement compo-
nents.

3. Do not remove, install or handle the picture tube in any manner
unless shatter-proof goggles are worn. People not so equipped
should be kept away when picture tubes are handled. Keep the
picture tube away from the body while handling.

4. Protective shields are provided on this chassis for the protection of
both the service technician and the costumer.
Protection shields removed for service convenience must be re-
installed correctly and ANY MISSING SHIELD MUST BE RE-
PLACED. DO NOT OPERATE THIS INSTRUMENT WITHOUT THE
PROTECTIVE SHIELDS IN

POSITION AND

PROPERLY SE-

CURED.

5. After any service intervention, the service technician must be sure
that no protective device built into the instrument by the manufacturer
has become defective, or inadvertently defeated during servicing.

Therefore, the following checks are recommended for the continued
protection of the costumer and service technician.

GROUNDING CONTINUITY TEST

- Remove main plugs from wall outlet.

- With an ohm-meter in its lowest resistance range, measure resistance
between the grounding prong of the mains plug and all accessible
conductive parts.
THE METER MUST BE READ ZERO OHM.

- The mains plug still being removed from the wall outlet, switch on the
instument.
- Switch an ohm-meter in its highest resistance range, measure resis-

tance between the grounding prong of the mains plug and the two other

prongs of the mains plug.
BOTH METER READINGS HAVE TO BE MORE THAN 5 MEGOHM
(5 Mohm).

ANY

MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED

ABOVE THE INDICATIVE

OF A

POTENTIAL

SHOCK HAZARD

AND

CORRECTIVE ACTION MUST BE TAKEN BEFORE RETURNING

THE INSTRUMENT TO THE COSTUMER.

X-RADIATION AND HIGH-VOLTAGE LIMITS

The

primary source of X-radiation in solid state display units is the

picture tube. The picture tube is specially constructed to limit

X-

radiation

emissions. The shields and mounting hardware for picture

tubes have an X-radiation protection function and must be properly in

place.
For continued

X-radiation protection, the replacement tube must be the

s ane type as

the original, including suffix letter. High voltage is

—

a ntained within specified limits by the use of dose tolerance safety

.e a:ac

erponents/adjustments

in the power supply drcuit. Refer to

an X-radiation warning note on the Chassis Schematic and
Labels in the Basic Service Data for specific high-voltage

—

• z

as:

cnassis

and X

radiation Protection Circuits. If high voltage

: s

d limits, check each component spedfied in the

diagram and take necessary corrective action.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in display units have special
safety-related characteristics. These characteristics are often not evi-
dent from visual inspection nor can the protection afforded by then
necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which have these
spedal safety characteristics are identified in this Data and its Supple-
ments and Bulletins. Electrical components having such features are
identified by

or * on the schematics and on the parts lists in this

Data and its Supplements and Bulletins. The use of a substitute
replacement which does not have the same safety characteristics as
the recommended replacement part shown in the parts lists in this Data
and its radiation.

NOTE

FOR USERS IN THE UNITED KINGDOM :

IMPORTANT:
T

wires of the mains lead are coloured in accordance with the following code:

Green and Yellow:

EARTH

Blue: LIVE
Brown: NEUTRAL
Plug fusing value: 5 A

As the

colours of the wires in the mains lead of this apparatus may not correspond with the coloured

markings

identifying the terminals in your plug, proceed as follows:

The wire