Denon AVR-X250BT Service Manual

3-4. Protection History Display Mode
3-4.1. Actions
This mode enables the unit to record and display the event when the THERMAL, ASO or DC protection is
activated.
If protections have been activated multiple times, the latest protection operation is recorded.
3-4.2. Starting up
While the power is On, hold down buttons "
TUNER PRESET CH +
", "
TUNE -
" and "
TUNE +
" for at least
3 seconds.
Displays "
PROTECT
" using the "
STATUS
" button.
3-4.3. Displays
· The protection history can be checked.
(1) If no protections has occurred.
NO PROTECT
(2) ASO (if the last protection is ASO)
PRT:ASO
Cause A short circuit occurred between the speaker terminals, or speakers with an impedance outside
the rating were connected.
Note : Short circuits in speaker terminals or speakers can be identied.
If the power is turned on in the abnormal state, protection is activated after around 6 seconds and the
power is turned off.
(3) DC (if the last protection is DC)
PRT:DC
Cause : DC output of the power amplier is abnormal.
If the power is turned on in the abnormal state, protection is activated after around 6 seconds and the
power is turned off.
(4) THERMAL (if the last protection is THERMAL(A) or THERMAL(B))
PRT:THERMAL A
PRT:THERMAL B
Cause : Abnormal heat sink temperature.
(5) Case of Power supply (when the last protection incident is Power protection)
PRT:Power
Cause : Abnormal ( ± B, ± 12V).
Caution : These protections may also be activated due to other factors such as disconnection of connec-
tors or operations around the microcomputer.
After viewing the above protection history, press the "
TUNE -
" button to return to the normal display.
3-4.4. Clearing the Protection History
There are two ways to clear the protection history.
(1) Activate Protection History Display Mode.
Press and hold the following button for 3 seconds.
PRT:DC
Press and hold the "
TUNE +
" button for 3 seconds.
PRT:CLEAR
The above message is displayed and the protection history is cleared.
NO PROTECT
(2) Initialize this unit. (See "Initializing this Unit")
b
Use the method in 3-4.4. (1) if you do not want to erase your settings from this unit.
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
73

Denon AVR-X250BT Specifications

General

Impedance	16 Ω
Receiver type	Surround
Frequency range	10 - 100000 Hz
Pre-out connectivity	Yes
Audio output channels	5.1 channels
Signal-to-Noise Ratio (SNR)	98 dB
Total Harmonic Distortion (THD)	1 %
Power output per channel (1KHz@6 Ohm)	90 W
Power output per channel (1KHz@8 Ohm)	70 W
Power output per channel (20-20KHz@8 Ohm)	130 W
AirPlay	No
Display	VFD
HDCP version	2.2
Product color	Black
Audio decoders	DTS-HD, DTS-HD Master Audio, Dolby Pro Logic II, Dolby TrueHD
HDMI in	5
Composite video in	2
Digital audio coaxial in	-
Supported graphics resolutions	3840 x 2160
AM band range	522 - 1611 kHz
FM band range	87.5 - 108 MHz
Supported radio bands	AM, FM
AC input voltage	230 V
AC input frequency	50 Hz
Power consumption (standby)	0.5 W
Power consumption (typical)	330 W
Number of HDMI outputs	1
Connectivity technology	Wired & Wireless
Speakers connectivity type	Clamp terminals

Weight and Dimensions

Depth	319 mm
Width	434 mm
Height	151 mm
Weight	7500 g