Pioneer M-AX10 Service Manual page 49

5. Mode Switching Processing (IC901)
Select the mode of the speakers using the MODE switch (rotary
switch).
Any of three modes (BRIDGE, DUAL and SEPARATE) can be
selected.
Table Mode select indicator processing
Mode Indicator
ACT
Input Port Process Port
27
L 8 (IND BRD.)
(BRIDGE)
28
9 (IND DUAL)
L
(DUAL)
30
7 (IND SEPA.)
L
(SEPA.)
Table Mode select port processing
Mode
Input Port ACT
12 (INPUT2)
INPUT1 : "L"
27
L
(BRIDGE)
INPUT2 : "H"
INPUT1 : "L"
28
L
(DUAL)
INPUT2 : "H"
30
Fixed at "L"
L
(SEPA.)
The MODE switch is disabled while power is ON.
(See "7. WARNING.")
6. DAC Volume Transfer (IC901)
When the status of port 29 (VR1) changes, port 29 (VR1), port 30
(VR2), port 42 (VR3), port 23 (VR4), and port 24 (VR5) are
checked to detect the VOLUME position.
With DUAL, BRIDGE, or SEPARATE, the attenuation volume is
read from the VOLUME position/ATT volume table and
transferred to the DAC IC in Serial mode (MSB first).
When the transfer is completed, LD (port 2) is set to "L" then
returned to "H."
When ATT.THROUGH is ON or port 13 (ATT.THROUGH) is
"L," port 2 (LD), port 3 (CLK), and port 4 (SRD) are fixed at "L."
Then the data are transferred again when port 13 (ATT.THROUGH)
is set to "H."
When switching ATT.THROUGH from ON to OFF or when
turning power ON:
Data transfer is performed 2 seconds after the switch is operated.
Switching
DACVR (pin 13)
Data transfer
2 sec
Contents of Process
Sets to "H".
Sets to "H".
Sets to "H".
Contents of Process
Process Port
13 (DACVR) 14 (SEPARATE) 15 (INVERT)
ATT. through : "L"
"L"
ATT. exist : "H"
ATT. through : "L"
"L"
ATT. exist : "H"
ATT. through : "L"
"H"
ATT. exist : "H"
IC901 PD5508B9
16 (SPRYH)
ATT. through : "H"
"H"
ATT. exist : "H"
ATT. through : "L"
"H"
ATT. exist : "L"
ATT. through : "L"
"H"
ATT. exist : "L"
When switching ATT THROUGH from OFF to ON or when
turning the power ON:
Port 2 (LD), port 3 (CLK), and port 4 (SRD) are fixed at "L"
before DACVR (pin 13) is set to "L," 30 ms after relay becomes
OFF.
Relay
Three data lines
"L"
DACVR (pin 13)
Data transfer is performed once in the following conditions and
terminated:
• When the power is turned on
• When the VOL is operated
• When ATT.THROUGH is switched from ON to OFF
• When ATT.HOLD is switched from ON to OFF
M-AX10
17 (SPRYG)
"L"
"L"
"L"
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