Printhead; Buzzer Function - Epson LQ-300 + Service Manual

EPSON LQ-300+

2.2.1 Printhead

The table below shows the printhead specifications.
Table 2-1. Printhead Specifications
Item
Number of wires 24
φ0.20 mm
Diameter of wire
See the figure below.
Wire configuration
Note: The figure is seen from the back of the head
facing printing side.
Direct current coil resistance 54.7 ± 3.9Ω (at 25°C)
Number of coils 24
Head drive method Rated voltage drive
Head drive voltage 35V ± 3.5V
• Normal Mode: 0.65A (38.5V x 270µs at 5°C)
Maximum peak current
• Copy Mode:
• Normal: 1350Hz or less
Head drive frequency
• Copy:
• Black ribbon: 0.2 billion stroke/ wire or more
Head life
• Color and film ribbon: 0.1 billion stroke/ wire or
• Temperature: 5 to 55°C
Environmental condition
• Humidity:
Operating Principles
Specification
0.67A (38.5V x 290µs at 5°C)
1350Hz or less
more
10 to 85% (

2.2.1.1 Buzzer Function

This printhead also works as a buzzer. The table below is buzzer specification.
Table 2-2. Buzzer Function -- Specification
Head voltage
Drive frequency
Printer Mechanism
#2
#1
#4
#3
#6
#5
#8
#7
#10
#9
Head Center
#12
#11
#14
#13
#16
#15
#18
#17
#20
#19
#22
#21
#24
#23
Figure 2-3. Wire Configuration
Item Specification
35V ± 3.5V
2kHz, 1.5kHz
Revision C
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