Pioneer VSX-816-S Service Manual - Page 129

AMPLIFIER SYSTEM PROTECTION OPERATION SPECIFICATION, DC-abnormality detection

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5 6 7 8 7.3.2 AMPLIFIER SYSTEM PROTECTION OPERATION SPECIFICATION 1. DC-abnormality detection DC detection is only enabled 2 seconds after power-on. A If there is a fault in the power amplifier or a high-level signal lower than 5 Hz is input, the DC_DET port becomes "L". If the "L" is detected, the microprocessor will perform as following flow chart. In the case of simultaneous detection with the overload protection circuit, DC-abnormality detection is performed preferentially to overload detection. When a DC abnormality is detected, A.MUTE* is turned on, speaker relay is turned off, then "AMP_ERR" flashes on the display. *A.MUTE : Audio mute command B ↓ The abnormality continues for 3 seconds. ↓ Continues. ↓ Recovery The power is shut off. The program restarts. ↓ Power key not effective and POWER LED blinks. 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. C 1 TESTMODE ON (A55F+A55F) 2 When power off, push FRONT ENTER key + ADVANCED SURROUND key continuously 2sec. (2: When a DC abnormality is detected and the power is shut off.) Any other key input from front panel or remote control will not be detected. 2. Overload detection If the speaker terminals are short-circuited or low-load driving is detected, the OL_DET port becomes "L". If the "L" is detected, the microprocessor will perform as following flow chart. When an overload is detected, A.MUTE* is turned on, speaker relay is turned off, then D "OVERLOAD" flashes on the display. ↓ The abnormality continues for 3 seconds. ↓ Continues. The power is shut off. ↓ Recovery The power is shut off even if the unit recovers. E F VSX-816-K 129 5 6 7 8

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7.3.2
AMPLIFIER SYSTEM PROTECTION OPERATION SPECIFICATION
1.
DC-abnormality detection
DC detection is only enabled 2 seconds after power-on.
If there is a fault in the power amplifier or a high-level signal lower than 5 Hz is input,
the DC_DET port becomes “L”.
If the “L” is detected, the microprocessor will perform as following flow chart.
In the case of simultaneous detection with the overload protection circuit,
DC-abnormality detection is performed preferentially to overload detection.
If the speaker terminals are short-circuited or low-load driving is detected, the OL_DET port becomes “L”.
If the “L” is detected, the microprocessor will perform as following flow chart.
*
A.MUTE
:
Audio mute command
↓
The abnormality continues for 3 seconds.
↓
Continues.
↓
Recovery
The power is shut off.
The program restarts.
↓
Power key not effective and POWER LED blinks.
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.
(
2
: When a DC abnormality is detected and the power is shut off.)
Any other key input from front panel or remote control will not be detected.
2.
Overload detection
↓
The abnormality continues for 3 seconds.
↓
Continues.
↓
Recovery
The power is shut off.
The power is shut off even if the
unit recovers.
When a DC abnormality is detected, A.MUTE
*
is turned
on, speaker relay is turned off, then
"AMP_ERR" flashes on the display.
When an overload is detected, A.MUTE
*
is turned on,
speaker relay is turned off, then
"OVERLOAD" flashes on the display.