(1) measuring IC601 (20 feet TA8844N) presence of about 0.5 Vp - p chroma signal input, if not, check the 4.43/3.58 MHz band LC601 and LC602 electricity road, related devices and bandpass switching circuit. VPDservice manual download site
 VPDservice manual download site
(2) measure IC601 14 feet 1 h delay line driving signal waveform is normal, without waveform. Should check IC601 16 feet ACC filtering is normal and 17 feet external bypass capacitors is open circuit. VPDservice manual download site
 VPDservice manual download site
Normal 14 feet when the PAL, NTSC, SECAM reception should waveform output, when PAL, SECAM, 14 feet around the dc voltage of 7.4 V, in black and white and NTSC, 14 feet about 10 V dc voltage. VPDservice manual download site
 VPDservice manual download site
 VPDservice manual download site
(3) measuring 1 c601 12 feet signal waveform is normal, if abnormal or no signal waveform, check the 12 feet external 1 h delay circuit device is damaged. VPDservice manual download site
 VPDservice manual download site
IC601 (2), (4) 64 feet signal is normal, if abnormal or no signal waveform, internal demodulation circuit fault, check the color subcarrier oscillation and pattern recognition circuit is normal. First IC601 26 feet color subcarrier oscillation waveform measurement is normal, if abnormal or no signal, should check whether 26 feet external crystal vibration element damage; Was detected in 26 normal feet, 22, 27 feet pattern recognition of the voltage is normal, normal in PAL, 22, 27 feet high level voltage of 10 v; When the NTSC, 22 feet for 5 v low level, and 27 feet for 10 v high level. If the voltage is not normal, 22, 27 feet should look up 22 feet and 27 feet of external circuit device is damaged, if no damage, and in 20 feet chroma signal input is normal, should be replaced IC601 attempt. VPDservice manual download site
 VPDservice manual download site
(5) if IC601 (2), 64 feet when the signal is normal, and test signal is normal IC601 60, 62 feet. If abnormal should check IC601 60, 62 feet external circuit related devices. VPDservice manual download site
 VPDservice manual download site
(6) IC601 7 feet color measurement control voltage is normal (normal value higher than 1.5 V). If 7 feet voltage is low or no voltage. Check 7 feet external circuits with and without damage of metamorphism.

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