Read Sony DHC-MD555 (serv.man2) Service Manual online
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(3) Power ON terminal
POWER ON:6 pin
Input port for turning on the power of the system stereo from an external equipment when the system stereo is in the STAND BY state. It
Input port for turning on the power of the system stereo from an external equipment when the system stereo is in the STAND BY state. It
is connected to the main microprocessor (microprocessor for controlling the power supply)of the system stereo.
The POWER input terminal of the main microprocessor is pulled up to H by the VDD. When the power on signal (L) from an external
equipment is input, the unit sets into the power on state.
Excessive noise may be output when the external equipment is turned on, etc. To prevent the power from turning on due to incorrect
operations by noises, the following POWER ON signal format is used.
Power on : L (100ms)
n H (100ms) n L (100ms)
Fig. 1-3. Power ON Signal
(4) Others
NC (OPEN):2 pin
Connected to nothing.
Connected to nothing.
VDD:3 pin
GND terminal where current supplied from the +5V power is returned.
GND terminal where current supplied from the +5V power is returned.
FRAME GND:8 pin
Shield part of the MINIDIN cable. Same as GND.
Shield part of the MINIDIN cable. Same as GND.
(Reference) Optional cassette deck signal (2pin:HELP)
Sets to L when data communication errors of the I2C bus are generated and retransmission is requested. Errors are usually not generated.
100ms
100ms
100ms
+5V
0V
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