Savin SLP20 Manual de Serviço descarregar pdf (Página 79)

IMAGE FUSING

SM 2-35 G031/G032

Detailed

Descriptions

The fusing temperature is controlled using the fusing thermistor [A].

The CPU checks the output from the fusing thermistor once a second. The CPU

compares the current and previous temperature, then decides the power-on ratio

for the next second. To maintain the target temperature, the CPU controls the

fusing lamp power-on ratio as shown in the following table.

Current minus Target

Previous minus Current

Over –3°C Within –3°C

Within +3°COver +3°C

Over –3°C

100% 60% 60% 60% 0%

Within –3°C

100% 60% 60% 40% 0%

0 100% 60% 60% 40% 0%

Within +3°C

100% 60% 60% 40% 0%

Over +3°C

100% 60% 0% 0% 0%

Ratio (%): The proportion of time that the fusing lamp power is on

2.6.8 OVERHEAT PROTECTION

If the hot roller temperature becomes greater than 230

C for more than 1 second,

the CPU cuts off the power to the fusing lamp. At this time, SC543 will be

generated.

Even if the thermistor overheat protection fails, there is a thermofuse in series with

the common ground line of the fusing lamp. If the temperature of the thermofuse

[B] reaches 169

C, the thermofuse opens, removing power from the fusing lamp.

At this time, the printer stops operating.

G031D528.WMF

[B]

[A]

CÓPIA NÃO CONTROLADA

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Savin SLP20 Manual de Serviço Página 79