Panasonic MX-2A power movement using thick blocks STR-S6709, the power section has four outputs : + B (+142 V) by the D807 rectified by capacitor C815, the C817 filter generated by the three -terminal regulator output +5 V, +9 V, +12 V for CPU and small signal processing circuit ; B3 (+18 V) rectified by the D811 , C819 filter to get , one of the primary power supply optocoupler D803 , the second is in the standby mode instead of B2 as IC804 power .fy4service manual download site

In normal viewing state , CPU29 pin output low , Q806 turns on , Q803 deadline , Q802 deadline , +90 V voltage supply only for D803 . At this time , IC804 input voltage provided by the +15 V. IC803 (SE140N) for the sampling amplifier integrated circuit , followed by sampling of +142 V power supply line to control the zoom level of conduction D803 , to ensure stable output voltage .fy4service manual download site

In standby mode , CPU29 feet high output , Q806 deadline , Q803 conduction , Q802 is turned on. At this time , the guide Q803 through a dual role : ( 1 ) pass through the guide D810 D803 degree increases, the equivalent resistance of the secondary becomes smaller, so that the output voltage of the power supply down to about 15% of the original ; ( 2 ) so B4 ( B4 at this time from the original +90 V down to about 13V) through R833, Q802 IC804 applied to the input , instead of B2 ( B2 at this time has been reduced to about 2V, has been impossible to IC804 effective power ) is IC804 power supply , thereby completing a flat state from the standby state to the power switch .fy4service manual download site