DAV-SZ1000W, HBD-SZ1000W (serv.man2) - Sony Audio Service Manual (repair manual). Page 6

1. The E4.2V form the SUB POWER TRANSFORMAER is provided to the RESET 

IC(IC5004) and the RESET SW(Q5001). IC5002 then boots up by sending the 
system reset signal to the SYSTEM CONTROL(IC5002 12pin).

2. The operation clock of SYSTEM CONTROL(IC5002) is 8MHz(X5001). The 

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SYSTEM CONTROL boots up by reading embedded firmware. This firmware can 
be updated by following a specific procedure.

3. When the SYSTEM CONTROL(IC5002) boots up properly, the LED lights up by  

LED_PWM terminal(28pin).

(Note) How to check if booted properly.

•

When the SYSTEM CONTROL(IC5002) boots up properly, “DEMO” will be 
indicated on the display of the main unit. If “DEMO” is not displayed, you need to 
check the power input signal to the SYSTEM CONTROL(IC5002).

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