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Sanken STR-G9626 Power Regulator IC.

Maintenance points:
(1) If the B+ voltage has no output, check whether the external overcurrent detection component of the 2 pin is overcurrent, and check whether the 4 or 1 pin power supply is Normal, if necessary, try to repair a 10kΩ resistor in parallel with TLP621 3 and 4 feet.

(2) If the B+ voltage is too high, mainly check the voltage regulator circuit components such as R952 ~ R955, Q928, IC902; B+ voltage is low, Then disconnect the Q924 collector, measure the B+ voltage, see if the fault is in the regulator circuit components or in the R928, D910, C917, D909 and other delay circuit components; B+ with poor load capacity, mainly check R911 ~ R913, IC901, T901, Q901, D906, D924 and other components.

SMPS - 2SC5287 / 2SC5302 / ( version: STR-W6553A )
SMPS - STR-W6553A / STR-W6556A / 5Q0765RT 

"STR-W 6800 Series ICs" for QuasiResonant SMPS with high efficiency and low noise that consume only one-tenth of the electric power compared with that of our conventional devices.

Reference PDF : https://www.dropbox.com/s/7rm7z4wc6uxtmk9/STRW6753.pdf

Sanken Hybrid Voltage Regulator Module, STR Series.

[SANKEN]

STRF6456 = STR-F6454 = IRIS-F6454R