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M-AX10
3.1 Key Inputs
A key input becomes valid after 40 ms, to eliminate chatter. The ATT.THROUGH key input from OFF to ON becomes valid when the key is held pressed for 2 seconds.
Port 16 (SPRYH)(Pin16) is set to "L" 10 ms after ATT.THROUGH switching signal input, and relay is set to OFF. After another 30 ms, the INDICATOR port is processed. Port 31 (FMT)(Pin31) is set to "H," and muting is set to ON. Switching process is performed 100 ms after ATT.THROUGH switching signal input. When switching ATT THROUGH from ON to OFF: Data transfer to the DAC IC is performed 2 seconds after the key input. When switching ATT.THROUGH from OFF to ON: Port 2 (LD), port 3 (CLK), and port 4 (SRD) are fixed to "L" before DACVR (pin 13) is set to "L," 30 ms after relay becomes OFF. (See "6. DAC Volume Transfer."(P.49))
3.2 Switch inputs
The MODE switch (rotary switch) setting is read when the power is turned on. The switch operation with POWER ON is invalid. (See "7. WARNING."(P.50))
4. KEY PROCESSING (IC901)
4.1 ATT.THROUGH Switching
The ATT.THROUGH key input from ON to OFF becomes valid when the key is held pressed for 2 seconds. Any other key input during these 2 seconds is invalid. When switching from OFF to ON, the key input becomes valid at normal timing. After another 2 seconds, port 31 (FMT)(Pin31) is set to "L," and muting is set to OFF. After another 3 seconds, port 16 (SPRYH)(Pin16) is set to "H," and relay becomes OFF.
Key input valid
EEPROM writing
1
Relay
2 10 msec 3 5 sec
Mute
4 40 msec 5
LED ON/OFF processing 2 sec
6 40 msec
Switching
7
100 msec VOL. processing (ON � OFF)
8 2 sec
VOL. data line processing (OFF � ON)
9
Silent processing
0 200 msec
Fig.2 Timing chart when ATT. through key is pressed
47
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