Changed with the remote control mode, display correctly, but still. Estimate mode control circuit malfunction, on this part of the circuit is mounted on a vertical plate, connected directly with the Board seven feet instead of the seven-wire connection, vertical plates left the Board for easy maintenance.
Boards high, medium head (two in one) second SIF output video and mixed-signal sent to the State Board, into two paths (see attached map). Q673 spot followed by mixed signals all the way 3: LN41 NTSC video signal into standard control blocks IC6703 foot, ZN04 is used to filter out 4.5MHz SIF II; L241 PAL or SECAM system video signal enters the IC6706 foot, Z201/Z202/Z203 is used to filter out 5.5MHz, 6.0MHz, 6.5MHz, the second with medium frequency; the C680, L673, C681 highpass filter the video signal, and then via the Z676 gate (4.5 MHz) sent to 27 feet. Second audio and video signal via the CN41, LN40, CN42, QN40, emitter follower strobe into IC67012 and Z671/Z672/Z673 feet, Z674 with 14, 15 feet (500kHz) crystal oscillator signal mixing, and output from 16 feet, and then by Z675 strobe, Q671 shot and then sent to 24 feet.

IC6703, 6-pin input video signal selected by K1, output by 30 feet; 24, 27-foot K2 selected SIF signals from 9 feet out. Controlled by a frequency discriminator, automatic selection. Frequency discriminator is IC67020 4.5MHz resonance L671, 21 feet, with 13 foot input Flyback pulse for automatic identification.

4.5MHz signal input when the 27 foot, K1, K2, and "1" pass, and 25 pin the output voltage is 0V; 24 pin 6.0MHz signal input, the K1, K2, and "2", and output voltage is 8V and 25 feet.

When 25 pin voltage is 0V D003 is conduction, C2, C3 in series in parallel after C1, C1-capacity increase (low resonant frequency), the frequency 4.5MHz; when the 25 pin voltage is 8V D003 reverse-biased as, C2, C3, disconnect does not work on (high resonance), frequency 6.0 MHz. Frequency electronic audio signal after a thriving sent to audio amplifier circuit.

First measuring IC67025 feet voltage, for 0V, description identification errors (receives PAL D/K should for 8V), at focus check IC67020, and 21 feet between of L671 and the 13 feet voltage, measuring 13 feet voltage for 0.3V normal, split Xia L671 check, therein attached porcelain tube capacitor has is deep black, will its removal, with 68PF porcelain tablets capacitor add-ins substitution Hou, image color and the sound recovery normal.