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Service Manual SC-140
2. Safety instruction
WARNING : Only Competent Service personnel may carry out work involving the testing or repair of this equipment.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce petentially hazardous X-RAY RADIATION. To avoid such hazards, the high
voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is
26KV(21” - 29”) at max beam current. The high voltage must not, under any circumstances,
exceed 29.5KV (21" - 25”) or 30KV (28” - 29"). Each time a receiver requires servicing, the high voltage
should be checked. It is important to use an accurate and reliable high voltage meter.
2. The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-RAY RADIATION
protection, the replacement tube must be exactly the same type tube as specified in the parts list.
SAFETY PRECAUTION
1. Potentials of high voltage are present when this receiver is operating. Operation of the receiver outside the cabinet
or with the back board removed involves a shock hazard from the receiver.
1) Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions mecessary
when working on high voltage equipment.
2) Discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated
and if broken, glass fragments will be violently expelled.
2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.
3. When replacing a gigh wattage resistor ( metal oxide film resistor) in the circuit board, keep the resistor 10 mm
away from circuit board.
4. Keep wires away from high voltage or high temperature components.
5. This receiver must operate under AC 220~240 volts, 50Hz. NEVER connect to DC supply or any other power or
frequency.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this equipment have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection
afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its
supplements, electrical components having such features are identified by designated symbol on the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitutes
replacement parts which do not have the same safety characteristics as specified in the parts list may create X-RAY
Radiation.
Summary of Contents for DSC-3210E
Page 32: ...Service manual SC 140 31 Block diagram TDA8944J...
Page 35: ...Service manual SC 140 34...
Page 37: ...Service manual SC 140 36 Block diagram TDA6107Q...
Page 42: ...Service manual SC 140 41 5 Circuit description 5 1 Block diagram...
Page 60: ...Service manual SC 140 59 5 9 2 2 STR F6654 oscillating operation...
Page 78: ...Service manual SC 140 77 8 PCB Layout...
