Detect power each output voltage, in addition to other things voltage controlled voltage 12V were normal. 84-pin terminal voltage detection reset the microprocessor IC6001 is 0.8v, normal should be 4.8V, remove the vulnerability detection capacitor C6011 normal. In order to avoid detours, disconnect the negative terminal of the diode D6001 external connections, and increase access 5V voltage, the drum stops people warehouse and can be loaded, slow rewind the tape, the machine if people stopped photocell captive three seconds, indicating IC6001 normal, but dysfunction or output instruction is wrong.YeFservice manual download site
 YeFservice manual download site

    For ease of analysis, I believe can be seen as two of the reset circuit resets the machine, the first stage uses manifold IC7504 (PST7043) reset, the second stage uses resistive and capacitive components reset. If the second-level reset circuit is faulty, because the signal transmission is blocked, the self-test information screen will display "E9". Detection IC7504 ③ pin voltage is 0.8V, hand touch IC7504 hot. After the needles spin empty ③ pin voltage unchanged, but on-screen resume, determine its corrupt. Difficult to purchase because of the elements and the internal circuitry is unknown, component parameters refer to the second level reset circuit, homemade reset circuit board solder in the back with great success. Similar HDl00, HD80 video opportunities such failures can also do the same.YeFservice manual download site