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HZVservice manual download site
5. After the separation, C Y Y/C signal process SECAM system and NTSC4.43 bright color separation circuit separation of luminance signal to IC5502 (5 feet, with his feet after switch to switch the input of the black and white video signal from the output to attending today the feet, and the system of PAL/NTSC3.58 comb filter separating luminance signal to IC5501ts44. GIF (124 bytes), after the internal switch control from ts14-2. GIF (109 bytes) feet output, after the strip Y1 (A40) (3) feet and A12 (H2) ts36-4. GIF (122 bytes) feet to AV controller IC3001ts15-9. GIF (119 bytes). HZVservice manual download site
PAL/NTSC3.58, NTSC4.43 bright color separation circuit and SECAM system output chroma respectively to IC5503ts44. GIF (124 bytes), 5, 7, attending foot, from today, after the internal electronic switch ts14-2. GIF (109 bytes) feet chroma output NTSC and PAL/SECAM system, including NTSC chroma by strip Y1 (A40), A11 (H1) ts15-6 feet 4. GIF (124 bytes) feet to the electronic switching circuit is composed of Q3005 and Q3008; Chroma PAL/SECAM system by strip Y1 (A40) end feet, A11 (H1) ts09-1. GIF (125 bytes) feet to IC3001ts36-3. GIF (116 bytes), and then by IC3001ts37-1. GIF (124 bytes) feet in two way output: all the way to the Q3005, Q3008 electronic switch circuit, under the standard switch signal control to A plate IC601ts37-2. GIF (121 bytes) feet; The other way directly to IC601ts15-3. GIF (122 bytes) chrominance signal processing circuit inside the foot. HZVservice manual download site
HZVservice manual download site
Second, troubleshooting HZVservice manual download site
HZVservice manual download site
Here are five kinds of failure phenomenon of maintenance and repair. HZVservice manual download site
1. Only in the receiving system of PAL/NTSC3.58 signal without image when the fault is clearly digital comb filter circuit caused no bright color separation induced by abnormal signal output work, should check mainly shown in figure 2 Y/C separation circuit. First detected IC5501ts35-2. GIF (124 bytes) feet input video signal, if not, check the buffer circuit Q5521, Q5522, Q5516 and bias circuit and relevant parts of the video signal coupling circuit; If yes, then respectively detect IC5501 about pin dc voltage is normal. If abnormal voltage should check the pin pin corresponding peripheral circuit; With basic normal pin voltage, then measuring IC5501ts14-2. GIF (109 bytes) feet have colorless subcarrier synchronous clock signal input, if any, should check IC5501 and its peripheral circuit element; If not, check the ts14-2. GIF (109 bytes) foot external signal amplification circuit component.
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