Pioneer VSX-D814-K Service Manual page 75

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3. Board detection
Board detection is only enabled 2 seconds after power-on.
If the board connection from Main Ass'y to Amp&Primary Ass'y is interrupted,
the BOARD_DET port becomes "H".
If the "H" is detected, the microprocessor will perform as following flow chart.
In the case of simultaneous detection with the overload protection circuit,
Board detection is performed preferentially to DC-abnormality detection and Overload detection.
When an boad error is detected, A.MUTE* is turned on,
speaker relay is turned off, then
"BOAD ERR" flashes on the display.
The abnormality continues for 2 seconds.
The power is shut off.
4. Fan stop detection operation flow in the DC abnormality detection
If the fan is forcibly stopped, the 'DC PROT' port becomes "L". Then an abnormality of fan is detected.
When an abnormality of fan is detected,
A.MUTE* is turned on, speaker relay is turned off,
the "AMP_ERR" flashes on the display.
The abnormality continues for 3 seconds.
The power is shut off.
The power key is disabled.
However, when the following keys are pushed so that the key input of a line and the service can be carried out,
power can be on.
1 TESTMODE ON (A55F+A55F)
2 When power off, push FRONT ENTER key + ADVANCED SURROUND key continuously 2sec.
(Effective, only when power-off is carried out by DC detection)
5
6
↓
↓ Continues.
↓
↓ Continues.
↓
VSX-D814-K
6
7
↓ Recovery
The power is shut off even if the
unit recovers.
*A.MUTE : Audio mute command
↓ Recovery
The program restarts.
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8
A
B
C
D
E
F
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