Teac CT M28 S Service Manual

Page 2

CAUTION
BEFORE SERVICING THE CHASSIS. READ THE SAFETY PRECAUTION". X-RAY RADIATION
PRECAUTION AND PRODUCT SAFETY NOTICE" ON PAGE 2 OF THIS MANUAL.

X-RAY RADIATION PRECAUTION .

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards. the
high voltage must not be above the specified limit. The normal value of the high voltage of this receiver is
27 KV at zero beam current (minimum brightness) under 220V AC power source. The high voltage must not.
under any circumstances. exceed 30 KV.

2. Each time a receiver requires servicing. the high voltage should be checked following the HIGH VOLTAGE
CHECK procedure in this manual. It is recommended the reading of the high voltage be recorded as a part
of the service record. it is important to use an accurate and reliable high voltage meter.-

3. The primary source of 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.

4. Some parts in this receiver have special safety-related characteristics for X-RAY RADIATION protection.
For continued satetym parts replacement should be undertaken only after referring to the PRODUCT
SAFETY NOTICE below.

SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone untamiiliar with the necessary precautions on this
receiver.

The following are the necessary precautions to be observed before servicing this chassis.

I. Since the power supply circuit of this receiver is directly connected to the AC power line. an isolation
transformer should be used during any dynamic service to avoid possible shock hazard.

2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube.
The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter
proof goggles and keep picture tube away from the unprotected body while handling.

3. When replacing a chassis in the cabinet. always be certain that all the protective devices are put back in
place, such as; non-metallic control knobs. insulating covers, shields. isolation resistor~capacitor network
etc.

4. When replacing parts or circuit boards. disconnect the power cord.

5. When replacing a high wattage resistor (oxide metal film resistor) on circuit board. keep the resistor 10mm
(1/2 in.) away frOm circuit board.

6. Connection wires must be kept away from components with high voltage or high temperature.
7. If any'tuse in this TV receiver is blown, replace it with the FUSE specified in the chassis parts list.
8. The receiver is designed to operate with 200V {50Hz) AC mains.

PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristica. These

characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection. r-~

afforded by them cannot necessarily be obtained by using replacement components rated for higher wattage,
etc. Replacement parts which have these special safely characteristics are identified in this manual and-its
supplements electrical components havrng such features are shaded on the schematic diagram and the parts
list. .