Panasonic AG527DVDE - DVD/VCR/MONITOR, Руководство по обслуживанию

Страница: 6 / 303

2.3. CIRCUIT EXPLANATION
2.3.1. HORIZONTAL OSCILLATOR DISABLE CIRCUIT
The positive DC voltage, supplied from the D503 cathode for monitoring high voltage, is applied
to the IC5301 Pin11 through R503 and R5504. Under normal conditions, the voltage at IC5301
Pin 11 is less than approx. 3 V. If the high voltage at FlybackTransformer Pin 5 exceeds the
specified voltage, the positive DC voltage which is supplied from the D503 cathode also
increases. The increased voltage is applied to IC5301 Pin11 through R503 and R5504. Due to the
increased voltage at IC5301 Pin11,the horizontal oscillator frequency increases, the picture goes
out of horizontal sync, the beam current decreases and the picture become dark in order to
keep X-radiation under specification.
Figure 2
2.4. LASER PRODUCT
CLASS I LASER PRODUCT
- This equipment is certified to comply with DHHS Rules 21 CFR
Chapter 1, Subchapter J in effect as of date of manufacture. (Only
for U.S.A.)
This equipment is classified as a Class I (Class 1) level LASER Product and there is no
hazardous LASER radiation with the safety protection.
Caution:
Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation
exposure.
Never touch the internal parts in order to avoid EXPOSURE TO VISIBLE LASER RADIATION.
Unplug the AC power cord to the equipment when opening the top cover.
When the power switch is On, do not place your eyes close to the front panel opening door or
the other openings to look into the interior unit.
LASER Specification
Class I level A LASER Product (Class 1 level A LASER Product)
Wave Length:
647 - 677 nm (at DVD)
775 - 815 nm (at CD)
Laser Power:
No hazardous radiation is emitted with the safety protection.
2.5. PRECAUTION OF LASER DIODE
CAUTION:
6