Circuit Description - Pioneer VSX-1019AH-K Service Manual

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5.2 CIRCUIT DESCRIPTION

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[1] Protection Circuit Process List
Item
To detect amplifier damage
(defect status)
A process to protect speakers
DC
(for protection of connected
detection
external devices)
To detect overloading
AMP
(abnormal status)
overload
With low-load driving or a
short circuit of the speaker
terminals (for protection of the
amplifier)
DC Detection Circuit
TE
L 13942296513
E
POWER PACK ASSY
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Purpose Detection Method
Detects when the DC_PROTECT
port becomes "L".
(Pin 80 of IC3004)
Detects when the OL_DET port
becomes "L" (checks by interrupt).
(Pin 71 of IC3004)
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Process
Turns muting on and
speaker relay off, then
turns off the power after 3
seconds. Then flashes
MCACC indicator.
Turns muting on and
speaker relay off, and
immediately turns off the
power. Then flashes
PHASE CONTROL
indicator.
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Warning Indication
Once detected and turned
the power OFF.
Flashing "AMP ERR" for
Standby/ON button will be
3 seconds.
disabled. Press "TUNE-" &
"Multi-zone ON/OFF"
button together for 5
seconds, the unit will
re-check again the DC
detection port. If the DC
detection port become "H"
for 3 seconds, the unit will
returns to normal condition
automatically.
None
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V6 DISPLAY ASSY
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DIGITAL MAIN ASSY
C
COMPONENT ASSY
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Remarks
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C
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