Pioneer VSX-C300 Service Manual - Page 53

Operation of the Fan-Control Line

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VSX-C300 7.1.3 Operation of the Fan-Control Line 1. Detection of the heat sink The detection is carried out every other second by taking in the voltage of the thermistor at A/D (PORT 31). 2. According to the temperature detected, the following operation will be executed: 31 pin 15 pin 25 pin 64,66,67 pin 19 pin THRMO DCT Set voltage of A/D FAN START FAN MAX SP RELAY AMUTE Display 0 to 0.1V < 5 L 0.1V to 2.4V 5 to 122(60°C) L 2.6V to 2.8V (70°C)134 - H 2.8V to 3.4V (75°C)145 - L 3.4V to 4.1V (90°C)174 - L 4.1V - (115°C)210 - L L L L "THDCT NG" flashes for 5 seconds. L H H L H H H H H H H H "HEAT UP" flashes for 5 seconds at 20-sec intervals. H L L "OVERHEAT" flashes. • If you wish to switch FAN START from "H" to "L" and FAN MAX from "L" to "H," first set FAN START to "L," then after 100 µs, set FAN MAX to "H." • While "OVERHEAT" is flashing, only the POWER key is functional. 3. FAN operation • Once the fan starts rotating, it continues to rotate at the same speed until the temperature falls to 65°C. • Once the fan starts rotating, it continues to rotate for at least 20 seconds even after the temperature falls to the above-mentioned level. 4. Detection of abnormalities in the fan • If any abnormality is detected in the fan 5 seconds after it starts rotating at high speed, and if H (abnormal) is indicated for the FANDCT connector, "FAN STOP" is displayed for 5 seconds, then the power is turned off. • While "FAN STOP" is displayed, AMUTE is on, and RELAY is off. • While "FAN STOP" is displayed, only the POWER key is functional. • While the fan is rotating at low speed, abnormality detection is not carried out. 5. Abnormality in the thermistor If an abnormality (A/D voltage: 0.1 V or less) is detected in the thermistor, "THDCT NG" is displayed for 5 seconds, then the power is turned off. FAN Driver IC4201 PDG264A SW DCT V+12 12V R420 CN305 FAN+ FANFAN STOP 1SS355 1SS355 5V Q402 DTA124EK FAN Drive TERMO DTC Q404 2SC2712(GRBL) Q405 DTA124EK Q403 2SC2712(GRBL) V+5 CN306 1SS355 Q406 DTA124EK +6V -11.6V 53

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53
VSX-C300
7.1.3 Operation of the Fan-Control Line
1. Detection of the heat sink
The detection is carried out every other second by taking in the voltage of the thermistor at A/D (PORT 31).
2. According to the temperature detected, the following operation will be executed:
THRMO DCT
Set voltage of A/D
FAN START
FAN MAX
SP RELAY
AMUTE
Display
0 to 0.1V
< 5
L
L
L
L
"THDCT NG" flashes for 5 seconds.
0.1V to 2.4V
5 to 122(60
°
C)
L
L
H
H
2.6V to 2.8V
(70
°
C)134 –
H
L
H
H
2.8V to 3.4V
(75
°
C)145 –
L
H
H
H
3.4V to 4.1V
(90
°
C)174 –
L
H
H
H
"HEAT UP" flashes for 5 seconds at 20-sec intervals.
4.1V –
(115
°
C)210 –
L
H
L
L
"OVERHEAT" flashes.
31 pin
15 pin
25 pin
64,66,67 pin
19 pin
• If you wish to switch FAN START from "H" to "L" and FAN MAX from "L" to "H," first set FAN START to "L," then after 100
μ
s, set
FAN MAX to "H."
• While "OVERHEAT" is flashing, only the POWER key is functional.
3. FAN operation
• Once the fan starts rotating, it continues to rotate at the same speed until the temperature falls to 65
°
C.
• Once the fan starts rotating, it continues to rotate for at least 20 seconds even after the temperature falls to the above-mentioned level.
4. Detection of abnormalities in the fan
• If any abnormality is detected in the fan 5 seconds after it starts rotating at high speed, and if H (abnormal) is indicated for the FANDCT
connector, "FAN STOP" is displayed for 5 seconds, then the power is turned off.
• While "FAN STOP" is displayed, AMUTE is on, and RELAY is off.
• While "FAN STOP" is displayed, only the POWER key is functional.
• While the fan is rotating at low speed, abnormality detection is not carried out.
5. Abnormality in the thermistor
If an abnormality (A/D voltage: 0.1 V or less) is detected in the thermistor, "THDCT NG" is displayed for 5 seconds, then the power is turned
off.
FAN Driver
Q404
2SC2712(GRBL)
Q405
DTA124EK
Q402
DTA124EK
R420
Q403
2SC2712(GRBL)
Q406
DTA124EK
1SS355
1SS355
1SS355
FAN Drive
5V
SW DCT
12V
V+12
+6V
-11.6V
IC4201
PDG264A
CN305
CN306
TERMO
DTC
V+5
FAN+
FAN-
FAN
STOP