In addition Q1305 CAP VS Q1306 DRUM VS Q309 BL power section also has a confirmation sound ( triode all good ) without all the normal output alia , power rear speakers can hear the confirmation tone , switch the recording or playback when the machine without any display and action, monitoring the voltage found instant boot with output, remote control display _ : __ : __ after the power is turned off , after entering the maintenance mode before closing the remote control will always have a display , view data and found that only 2 data , data from other pages are all 00 and see slower, has replaced IC1301 IC4401 fault unchanged, the master CPU 's 32K 20M crystal has a waveform. By not look at the data analysis may EEPROM is not working properly , the normal operating voltage measurement IC4502 D2.8V measure IC4501 D8 MECHA control found no oscillation signal over 20M , this signal is generated by IC4902 HI8/STD8 CONTROL, no signal oscilloscope test , replace the after the crystal was found on the remote control condensation symbols, immediately enter maintenance mode other page data can also be seen, the board Replacing the machine is turned on as usual. Through the repair can be found in the repair of these motherboards motherboard and the machine completely separated , then only the remote control and power supply board can determine the basic part of the normal or not, each power supply in addition to CAP VS, DRUM VS, BL REG controlled no output in addition, the other should be the brightest talent in the normal power supply . Each crystal (of 4 ) should all have waveforms, together with other repair methods generally can accurately find the fault location.Hq7service manual download site