Movement for the C150 aircraft, CPU is MN15151, small signal processing circuit is TA8844A. Power Measurement + B voltage 26V, after removing the standby control transistor Q802, the main voltage is restored to 115V, and Tuning control to normal. Measured Q802 intact, CPU29 foot standby / power control terminal voltage is always O. 7V, with a needle dangling 29 feet, 29 feet voltage can be measured with remote on / off between changes in O ~ 5V. Boot Q803 b pole O. 7V come from? Analysis from the figure, only from R862, measured R862, R845 completely normal, simply remove the R862, on / off properly, the machine repaired. A month later telephone interviews, completely normal.4k7service manual download site