(1) RS flip-flop is always 9 feet high, mostly RT2, R809 open, RT2 poor performance, Q802 internal damage; (2) RS flip-flop 13 feet is always low; (3) Q801 internal damage to 11-pin output level is always low; (4) Q812 breakdown leakage, RY02 contact adhesion can not be separated.syGservice manual download site