DVD-CD Trainer Model ETR 021

Sci-tech DVD-CD Trainer Model ETR 021 is an educational instrument designed for the theoretical/practical study of the workings of a DVD & CD player, as well as the operation of DVD-format digital video and audio signals, and digital audio in CD format. The functional structure of the equipment enables its internal composition to be observed, with various signals involved in its operation analyzed by means of a block diagram and faults introduced, all in order to aid the student learn diagnostic methods and how to locate breakdowns.

Item Description

The trainer includes a DVD & CD player using the latest digital signal processing technology, and offering the best features found on the market today. In the training Manual, the theoretical aspects and the description of the circuits are also included basic that compose the equipment.

The instrument is backed up by extensive documentation (which includes a Training Manual, Teacher’s Manual and Technical Documentation Manual), a Test DVD disk, a Test CD disk*, an
infra-red remote control (batteries included) and an audio/video connector cable.

Using the block diagram, which shows the generic structure of a DVD & CD player, the student can access the main signals involved. The block diagram consists of the following stages:
– Optical Unit (Pickup) – RF Block – Servo systems
– Drivers – Digital Signal Processor – Video Processor
– Audio Processor – System Control – Keyboard, Remote –
Control, Display – Power Supply
The breakdown simulator enables malfunctions to be introduced into the DVD & CD player, thereby simulating a large number of real breakdowns.

Technical Specifications


Power Requirements: AC110-240V, 50/60Hz

Power Consumption: 10W

Weight: 1.7Kg

Dimensions: 430 mm (W) x 207 mm(D) x 42mm

Operating Temperature Range: +5°C to 35°C


DVD (Digital Versatile Disc):

Reading Speed – 3.49~4.06m/sec.

Approx. Play Time

(Single Sided, Single Layer Disc): 135 min.

CD : 12cm (Compact Disc)

Reading Speed – 4.8~5.6m/sec., Maximum Play Time: 74 min

CD : 8cm (Compact Disc)

Reading Speed – 4.8~5.6m/sec., Maximum Play Time: 20 min

VCD: 12cm

Reading Speed – 4.8~5.6m/sec., Maximum Play Time: 74 min (Video+Audio)

Video Output:

Composite Video – 1 channel; 1.0 Vp-p (75ohm load)

Component Video:

Y – 1.0 Vp-p (75ohm load)

Pr – 0.70 Vp-p (75ohm load)

Pb – 0.70 Vp-p (75ohm load)

Audio Output:

S- Video: Luminance Signal: 1.0 Vp-p (75ohm load)

Chrominance Signal: 0.3 Vp-p (75ohm load)

2 channel: L (1/L), R(2/R)

*Frequency response: 48 KHz Sampling- 4Hz to 22KHz

96 KHz Sampling- 4Hz to 44KHz

*S/N Ratio: 110dB

*Dynamic Range: 100dB

*Total harmonic Distortion: 0.004%

*: Nomination Specific