hi,

You should use one of suggested fixes. But you used both of them and so come to trouble once again. You do not set TI flag anymore but now check for it before transfer.
Better just disable serial interrupt on transmitter side:

//transmit program 
#include<reg51.h> 

void Serial_Init(void) 
{ 
SCON=0x52;  // set TI flag to indicate that UART is free
ES=0;       // disable serial interrupt due we have no its ISR
// EA=1;    // enable rest interrupts if it needs
TMOD=0x20; 
TH1=0xE6; 
TR1=1; 
} 

void Transmit_Char(unsigned char c) 
{ 
while(!TI); //Waits until previous transmit has been done
TI=0; 
SBUF=c; 
}

Code above should help to send byte now.

Regards,
Oleg