SCAMAX
®
2600/4000
Tech. Manual 06/2002
T-50
3.10 Lamp Unit
The power supply circuit diagram also shows the power circuit for the lamp unit. It consists of the
following parts:
3.10.1 Rectifier Board
A small board with rectifier bridge and filter capacitor. Power input is 21.5V AC from the mains power
transformer. Output is +24V DC that is supplied to the electronic ballast of the fluorescent lamp/s.
3.10.2 Electronic Lamp Ballasts
The SCAMAX 2600/4000 has one or two (simplex or duplex) electronic ballasts of the type: EVG
INSTALL-S 1x11W / 24V, one for each fluorescent tube.
These ballasts cause lamp saving start (pre-heating) and ensure optimum life span of the lamps.
Lamp malfunctions (short, end-of-life, excessive voltage, idling, glass breakage, quasi-rectifier operation,
spiral break when switching on and during operation) are recognised by the ballast and are rectified or
cause shutdown. In the case the scanner has to be powered down and the fluorescent tubes have to be
replaced.
Voltage in the lamp circuit is 230 V.
3.10.3 Fluorescent Lamps
Two miniature fluorescent tubes with a diameter of 7 mm and 11 W rated output are used. Each tube is
supplied with its own power by a ballast unit. One tube illuminates the front of documents and the second,
optional, tube illuminates the back.
The tubes have contact pins at their ends that are inserted into spring loaded lamp holders by turning the
tubes on their axis. The two lamp holders are connected by a load-bearing piece of sheet metal that also
shields against unwanted light upwards and downwards as appropriate.
Summary of Contents for SCAMAX 2600
Page 7: ...SCAMAX 2600 4000 Tech Manual 06 2002 T 7...
Page 12: ...SCAMAX 2600 4000 Tech Manual 06 2002 T 12...
Page 14: ...SCAMAX 2600 4000 Tech Manual 06 2002 T 14...
Page 16: ...SCAMAX 2600 4000 Tech Manual 06 2002 T 16 Illustration of optical reduction...
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