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saurav_sdpl,
It looks like a crude current limiter. When the current through R16 is high enough to approach 1 diode drop, Tr5 starts to conduct base current, turning TR5 on. When TR5 turns on it applies a positive voltage to the base of TR6, which then starts to turn off. D4 is for reverse voltage protection of the input.
Regards,
Kral
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