2.1.8Alarm Circuit

(1)Head drive time alarm circuit

This circuit monitors the drive time using the HDALM signal interlocked with the overdrive signal of each drive circuit.

If the drive time of any drive circuit exceeds the specified time, the drive fault alarm circuit sends an ALARM-N signal to turn on the SCR (SO).

This cause the secondary coil (40V) of the transformer to be short-circuited, causing an overcurrent to flow through the primary coil and making the AC fuse (transformer ASS) open.

(2)Alarm processing when DC power is low.

+ 40V is converted into the POWLEV signal (0V to +5V) by R531 and R532 and input into the A/D port of the MPU to control the drive time and the print speed (pass number) of the head.

+40V

R531

POWLEV

R532

(a)Head drive time

The head drive time is lengthened to compensate for the amount of voltage drop by monitoring the POWLEV signal once every 500 μ sec. to control and maintain the impact necessary for each printing pin at the fixed value.

(b)Print speed

Voltage, +40V

Pass number

Print speed

 

 

 

38V or more

1 Pass

100%

25V to 37V

1 Pass

100~30%

25V or less

1 Pass

30%

 

 

 

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Oki Microline Printer, 3391, 3390 specifications Powlev

3390, Microline Printer, 3391 specifications

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