Denon AVR-791 Service Manual

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2. Errors checking mode (Displaying the protection history)
2.1. Operationspecications
Error mode (Displaying the protection history):
When started up, the error information is displayed.
Starting up:
●Allmodelcommonness
With the "STATUS" and "MULT EQ" buttons pressed, press the "ON/STANDBY" button to turn the power on. The error
(protection history display) mode is set.
Now, press the "STATUS" button to turn on the FL display.
2.2. About the display on the FL display
When the "STATUS" button is pressed after setting the error (protection history display) mode, a history like the one
shown below is displayed, depending on the conditions.
(1) Normally (when there has been no protection incident)
FLD
N O P R O T E C T
(2) For ASO (when the last protection incident was ASO protection)
FLD
P R T : A S O
Cause: The line between speaker terminals is shorted, or use speakers having impedance less than that specied.
Supplementary information: As the excess current is detected after operation of the speaker relay, the shorted
speaker terminal and the connected speaker can be identied.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.
(3) For DC (when the last protection incident was DC protection)
FLD
P R T : D C
Cause: DC output of the power amplier is abnormal.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.
(4) For THERMAL (when the last protection incident was THERMALprotection)
FLD
P R T : T H E R M A L
Cause: The temperature of the heat sink is excessive.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.
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Additional causes of protection can be due to loose connections, associated components, Microprocessor, etc.
When the "STATUS" button is pressed again after the above protection history is displayed, the normal display reappears.

Denon AVR-791 Specifications

General

Number of Channels	7.1
HDMI Inputs	4
HDMI Outputs	1
Audyssey Technologies	Audyssey MultEQ, Audyssey Dynamic Volume, Audyssey Dynamic EQ
4K Pass-Through	No
Signal-To-Noise Ratio	100 dB
HDMI Switching	Yes
Input Sensitivity	200 mV
THD	0.08%
Surround Sound Effects	Yes
Digital Sound Processor (DSP)	Yes
DSP Preset Qty	7
Tuner Bands	AM/FM
Preset Station Qty	56
Auto Preset Memory	Yes
HDMI Pass-Through	Yes
Frequency Response	10Hz-100kHz
Power Output	90 W per channel (8 ohms, 20Hz-20kHz, 0.08% THD)
Dolby Technologies	Dolby Digital Plus, Dolby TrueHD
DTS Technologies	DTS, DTS-HD Master Audio, DTS-HD High Resolution Audio, DTS Neo:6
Response Bandwidth	10 - 100000 Hz
Input Impedance	47 kΩ
Audio D/A Converter	24-bit / 192kHz
DSP Presets	Rock Arena, Jazz Club, Mono Movie, Matrix, Virtual, Game
Tuning Range	AM: 520 - 1710 kHz, FM: 87.5 - 108 MHz
Connector Type	HDMI
Amplifier Output Details	90W x 7 (8 ohms, 20Hz-20kHz, 0.08% THD)
Video Conversion	Yes (Composite to HDMI)