2 – 17
2.1.8 Alarm 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 causes the secondary coil (40V) of the transformer to short-circuit, causing an
overcurrent to flow through the primary coil and open the AC fuse (transformer assy).
(2)
Alarm processing when DC power is low.
+ 40V is converted into the POWLEV signal (0V to +5V) by R28 and R29 and input into
the A/D port of the MPU to control the drive time and the print speed (pass number) of
the head.
(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
+40V
R28
R29
POWLEV
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%
Содержание MICROLINE 320
Страница 7: ...1 2 1 2 Options 1 Cut sheet feeder unit CSF Attachment assy 2 Pull tractor assy Single bin CSF...
Страница 8: ...1 3 3 Bottom push tractor unit 5 Serial I F RS 232C 4 Roll paper stand Narrow only...
Страница 36: ...2 28 Figure 2 6 Ribbon cartridge Drive gear Ink reservoir...
Страница 47: ...2 39 Figure 2 14 Change lever Release cam Platen Front release gear arm TOP BOTTOM REAR Pressure rollers...
Страница 49: ...2 41 Paper end sensor Sensor lever Shaded portion A B Paper end lever Bottom paper end lever Figure 2 15 C...
Страница 51: ...2 43 Platen Figure 2 16 Ribbon protector Printhead Carriage frame assembly...
Страница 90: ...5 2 Carriage shaft...
Страница 98: ...5 10 9 Carriage Assy NK2 10 SUS Bearing part of the guide roller EM 30L B...
Страница 119: ...6 21 Replace RS232C board Remedied No Yes End Replace driver board...
Страница 121: ...B 1 B SPARE PARTS LIST...
Страница 122: ...B 2 Figure 11 1 Upper Cover Assy 1 2 3 4...
Страница 124: ...B 4 Figure 11 2 Printer General Assy 6 9 8 2 7 4 5 3 10 1...
Страница 129: ...B 9 Figure 11 4 Carriage Assy 12 9 8 6 14 11 10 1 13 7 5 4 3...
Страница 131: ...B 11 Figure 11 5 Option Spare Parts 1 2 3 4 5 6 7 Pull Tractor Bottom Tractor I F Board...
Страница 145: ...Microline 320 321 Turbo Service Manual Part Number 59273701 Printed in the USA...