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Frontier 750 - 6901 ARCNET COMMUNICATION ERROR


tis
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Hi all. The LP7500 printer errors occurred E06901 - 0001, 0008,0009,521. I replaced the circuit board J391423, but with no effect. All current sources were checked and are OK. We observed  in Printer control box2 a fan does not work. Normal the fan is allways on. The display does not show temperatures, but the processor heats. Please help me.

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