Oki ML421 Maintenance Manual - Page 28

in the print head and the other in the SP/LF driver, is monitored by the A/D port

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Oki Data CONFIDENTIAL (4) Overheat alarm (a) Head overheat alarm The voltage of the output HTEMP signal of the thermistors, one of which is contained in the print head and the other in the SP/LF driver, is monitored by the A/D port of the MPU to control the voltage. Temp Stop Mode up 125°C 118°C 116°C Mode down Mode and print control • Characters less than 38ips • Characters more than 38ips Mode 1 2 3 4 5 6 7 DUTY 100% 87% 30% 13% 9% 5% 0% PrintSpeed Pass 100% 1 100% 1 100% 1 90% 1 80% 1 70% 1 Stop - Mode 1 2 3 4 5 6 7 DUTY 100% 87% 30% 13% 9% 5% 0% PrintSpeed Pass 100% 1 85% 1 70% 1 55% 1 40% 1 30% 1 Stop - • Only Image Mode 1 2 3 4 5 6 7 DUTY 100% 87% 30% 13% 9% 5% 0% PrintSpeed Pass 100% 1 85% 1 70% 1 100% 2 80% 2 50% 2 Stop - • When the temperature is between 118°C and 125°C, the mode switches sequentially to higher level. When the temperature falls below 116°C, the mode switches to lower level. • When the temperature exceeds 125°C, printing will stop. • When temperature gradient is steep, higher mode shall be specified directly. 42113901 Rev.2 28 /

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42113901
Rev.2
28 /
Oki
Data
CONFIDENTIAL
Stop
Mode up
Mode down
Temp
125
°
C
118
°
C
116
°
C
(4)
Overheat alarm
(a)
Head overheat alarm
The voltage of the output HTEMP signal of the thermistors, one of which is contained
in the print head and the other in the SP/LF driver, is monitored by the A/D port of
the MPU to control the voltage.
Mode and print control
Mode
1
2
3
4
5
6
7
PrintSpeed
100%
100%
100%
90%
80%
70%
Stop
DUTY
100%
87%
30%
13%
9%
5%
0%
Pass
1
1
1
1
1
1
–
• Characters less than 38ips
Mode
1
2
3
4
5
6
7
PrintSpeed
100%
85%
70%
55%
40%
30%
Stop
DUTY
100%
87%
30%
13%
9%
5%
0%
Pass
1
1
1
1
1
1
–
• Characters more than 38ips
Mode
1
2
3
4
5
6
7
PrintSpeed
100%
85%
70%
100%
80%
50%
Stop
DUTY
100%
87%
30%
13%
9%
5%
0%
Pass
1
1
1
2
2
2
–
• Only Image
•
When the temperature is between 118
°
C and 125
°
C, the mode switches sequentially
to higher level. When the temperature falls below 116
°
C, the mode switches to lower
level.
•
When the temperature exceeds 125
°
C, printing will stop.
•
When temperature gradient is steep, higher mode shall be specified directly.