UPMSP Radio & Colour TV Technique case studies
UPMSP Radio & Colour TV Technique · Put your knowledge to work in context.
UPMSP Intermediate Vocational Trade – Radio & Colour TV Technique is a Class 12 vocational credential awarded by the Uttar Pradesh Madhyamik Shiksha Parishad. It is designed for students who want a practical, employment-oriented qualification in consumer electronics servicing rather than a purely academic science route. The UPMSP Radio & Colour TV Technique case studies are 5 cases and about 3,424 words.
1Dark Screen with Normal Sound on a 14-Inch Monochrome TV
A 14-inch monochrome CRT television is brought to the workshop with normal sound but a completely dark screen. The customer says the picture disappeared suddenly after a power interruption.
749 words, about 4 min2Chirping SMPS in a 21-Inch Colour TV
A 21-inch CRT colour television is dead, but a soft 'chirp-chirp' is heard from the SMPS about twice per second. The mains is 230 V AC.
706 words, about 4 min3UHF Yagi Installation with Long Coax and Low MER
A viewer 32 km from a UHF transmitter installs a 12-element Yagi with 12 dBd gain on a 6 m mast. The downlead is 30 m of RG-6 coaxial cable with a published loss of 0.25 dB/m at 600 MHz, plus four connectors estimated at 0.5 dB each.
650 words, about 3 min4PAL Receiver Shows a Black-and-White Picture
A 29-inch PAL-D/K colour CRT television produces a sharp black-and-white picture and good sound, but no colour on any channel. The customer says colour worked intermittently for a few weeks before failing completely.
672 words, about 3 min5PA Amplifier Distortion at High Output with a 4-Ohm Load
A 100 W public-address amplifier is used in a school hall with two 8 Ω speakers connected in parallel, giving a 4 Ω load. At low volume the sound is clean, but as the volume is advanced past about 60 W output, the sound becomes harsh and the heatsink becomes very hot within ten minutes.
647 words, about 3 min