In selected state measured spectrum switch voltage is normal, damage of judging the tuner. mbbservice manual download site
 mbbservice manual download site
The machine tuners for "low level", namely when the switch receives a frequency voltage to low level 0 v, the rest of the band switch voltage of high level, in contrast to the common C tuner. The tuning for TECC2984VD28A shape, choose tesco, cheap C tuner, plus a few components to the substitution. Method is as follows: C tuner four grounding foot a little plastic shell, in addition to outside the function IF the feet from the roots after 90 ° bend the external 5 cm of a soft line, plug in the base plate and welding and IF good grounding the feet. According to the appended drawings welding on the surface of the copper foil on three only PNP silicon triode and only around 10 k Ω resistance, and connected with the corresponding feet can. This example of choice is the "Shanghai painting" the tuner. Although its working voltage is 12 v, but it is in the original machine can still work normally when power supply is 9 v .mbbservice manual download site