Pioneer KRP-500P Service Manual page 66

1
A
[2] SPECIFICATION OF THE FAN CONTROL
Block diagram
The external fans cool down the whole unit.
DIGITAL Assy
Module_Ucom
B
If an emergency signal
is detected, it will be
transmitted.
C
Panel Main_Ucom
D
MAIN Assy
Operation specifications
DAC output
DAC2
E
DAC1
STOP
Notes:
• The operating temperature of the fan is higher than the ambient temperature, because the sensor temperature is read by the
microcomputer.
• If the critical values for signals are displayed in the address circuit, the fan may be activated or be rotated at higher speed in response
to values lower than the set temperature values shown above.
• Depending on the ventilation conditions behind the unit, the fan may be activated or be rotated at higher speed in response to values
lower than the set temperature values shown above.
F
• When the temperature rises, the sensor voltage of TEMP3 increases.
• When the voltage of the DAC output from the Panel Main microcomputer decreases, rotation speed of the fan rises.
• Normally, the T1 temperature sensor output is used to control the fan.
The T2 sensor detects the temperature inside the unit and assists T1.
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1
2
SENS Assy
TEMP3
T2
TEMP3_2
FAN_NG A
FAN_NG B
TEMP3_1
FAN_ON A
FAN_CONT A
FAN_ON B
FAN_CONT B
External FAN
0xFF
43 45
2
3
External fans
OR OR
R R
TEMP3
T1
FAN__REG
FAN Assy
FAN A: 50 52 FAN A: 54 56
FAN B: 51 53 FAN B: 55 57
KRP-500P
3
4
FAN CH
Assy
FAN_VCC
0 to 12V
FAN_VCC
A
0 to 12V
FAN__REG
B
Temperature
SD
ºC
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