Safety Precautions; General - Commodore 1930 Service Manual

1930 SERVICE MANUAL
SAFETY PRECAUTIONS
Picture Tube Replacement
The primary source of X-radiation in this monitor is the
picture tube. The picture tube utilized in this chassis is
specially constructed to limit X-radiation emissions. For
continued X-radiation protection, the replacement tube
must be the same type as the original, including suffix
letter, or N.A.P. Consumer Electronics corp. (NAPCEC)
approved type.
Safety goggles must be worn when the picture tube is
replaced.
Parts Replacem ent
Many electrical and mechanical parts in NAPCEC
monitors have special safety-related characteristics.
These characteristics are often not evident from visual
inspection nor can the protection afforded by them
necessarily be obtained by using replacement
components rated for higher voltage, wattage, etc. The
use of a substitute part which does not have the same
safety characteristics as the NAPCEC recommended
replacement parts shown in this service manual may
create shock, fire or other hazards.
GENERAL
A
ESD
All ICs and many other semi-conductors are susceptible
to electrostatic discharges (ESD). Careless handling
during repair can reduce life drastically. When repairing,
make sure that you are connected to the same potential
as the mass of the set via a wrist wrap with resistance.
Keep components and tools also at this potential.
To prevent ICs and transistors from being damaged,
highvoltage flash-overs should be avoided. For checking
the high voltage, a suitable meter should be used. The
picture tube should be discharged only as indicated.
Removing the chassis
- Remove the backcover
- Slide out the chassis
- After repair the connecting cables of the chassis
should be fixed in the original way.
Be careful when measuring the EHT-section and the
picture tube.
Use plastic instead of metal tools for adjusting. This is
necessary to avoid a short-circuit or to avoid causing a
circuit to become unstable.
Never replace components when the set is switched on.