Oki IP-6620 Maintenance Manual page 526

These four switches installed on the front cover are the cover switches and interlock switches used
for detecting the cover open/close status. A set of one cover switch and one interlock switch is
provided on each end of the cover. When the cover is opened, the engine controller firmware detects
that the cover switch is OFF and processes it as an error. As a result the interlock switch turns off, and
the following three power supplies generated on the ACT3 board are turned off forcedly.
- P36VAR_HCB power supply
- P36VAR power supply
- P24VAR power supply
Thus the carriage and other driving parts are forced to stop.
(6) Take-up reel unit
The take-up reel unit comprises a fixed side unit, a sliding side unit, a TUR upper limit sensor and
a TUR lower limit sensor. The media is fixed to the paper tube of the flange with a tape to set the
media so that the media passes over the TUR upper limit sensor and TUR lower limit sensor in
the right side take-up unit. The engine controller firmware performs the take-up operation so that
the media is positioned between the TUR upper limit sensor and TUR lower limit sensor.
(a) Tension winding
In addition to loose winding mode, the printer also supports a tension winding mode in which
the media is taken up under a certain tension. The winding mode is switched only from the
operation panel.
(b) Inner/outer take-up directions
Both inner and outer take-up directions are supported. The take-up direction can be selected
regardless of the take-up mode. The take-up direction is changed using the switch installed on
the take-up unit. However, the loose mode is available only with the outer take-up direction.
(c) ON/OFF
The take-up reel unit is turned OFF by setting the take-up direction switch lever to the center.
OKI Data Infotech Corporation CONFIDENTIAL
Chapter 8 Operation Mechanism
8-5