Pioneer VSX-45TX Service Manual page 117

5
4 Diagnostic mode
This mode is only for servicing and checking the circuit design,
and not open to users.
When the STEREO/DIRECT key and TONE + key are both held
pressed for 2 seconds in Standby mode, the power is turned on,
and the number of times of each defect or Speaker relay off by
abnormality detection is sequentially displayed on the FL display.
Displayed items:
• DC detection
• Overload detection
• Fan detection
• Temperature detection
Hold the STEREO/DIRECT key and TONE + key pressed for 2
seconds in Standby mode.
PROTECT CHECK
DC
PROTECT CHECK
OVERLOAD
PROTECT CHECK
FANTOP
PROTECT CHECK
TEMP
When the MULTI CH IN key and TONE − key are both held
pressed for 2 seconds in standby mode, all clear the counter for
detection.
Protection Process List
Item Purpose
To detect amplifier damage
(defect status) A process to
DC
protect speakers
detection
(for protection of connected
external devices)
To detect overloading
(abnormal status) With low-
AMP
load driving or a short circuit
overload
of the speaker terminals (for
protection of the amplifier)
Protection function against a
Fan
temperature rise at the heat
control
sink
To know that the rotating fan
Fan stop
is forcibly stopped
5
6
003
002
000
000
Detection Method
Turns muting on and
Detects when the DC_DET port speaker relay off, then
becomes "L". turns off the power after 3
seconds.
Turns muting on and
Detects when the AMP_OL port
speaker relay off, and
becomes "L" (checks by interrupt).
immediately turns off the
power.
HY, F : Detect temperature
Turns muting on and
more than 100°C.
speaker relay off.
KU, J : Detect temperature
Rotate the fan
more than 125°C.
HY, F : Detect temperature
of 90 to 100°C.
Rotate the fan
KU, J : Detect temperature
of 110 to 125°C.
HY, F : Detect temperature
of 80 to 90°C.
Rotate the fan
KU, J : Detect temperature
of 80 to 110°C.
Detect temperature of 70 to 80°C. Fan is leading hold
A condition except the above. Stop the fan
Turns muting on and
Detects when the FAN_DET port speaker relay off, then
becomes "L". turns off the power after 3
seconds.
VSX-45TX
6
7
Process Warning Indication
Flashing "AMP ERR" for
3 seconds.
Flash the standby LED
after the power off.
None
Continue flasing with
"OVERHEAT"
Flashing "FAN STOP"
for 3 seconds
7
8
A
B
C
Remarks
Once detected and turned
the power off, input a key
never again.
D
Mute, relay and warning
indications is leading hold.
E
Mute off & relay on
(normal mode)
If the FAN_DET port
becomes "H" within 3
seconds, the unit resets
automatically. After the
power off, the key input is
possible once again.
F
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