Oki IP-6620 Maintenance Manual page 561

8.11 Media Heater Section
8.11.1 Configuration
The media heater hardware consists of the following units.
Unit name
Operation panel
IPB5 board
ACT3 board
TRC-MW board
Preheater
Printheater
Afterheater
8-40
Capability
● Inputs heater control settings
● Displays heater status
● Heater control
● DA converter for detecting
thermistor temperature
● TRC-MW board interface.
● Thermistor interface
Controls ON/OFF of the AC
power supplied to each heater.
A heater to warm up the
supply-side paper guide.
A heater to warm up the platen.
A heater to warm up the take-up
side paper guide.
OKI Data Infotech Corporation CONFIDENTIAL
Chapter 8 Operation Mechanism
Remarks
Display capabilities can be switched
using the heater button on the panel.
The heater control of this device is done
not by an independent CPU, but by the
firmware running on the main CPU
(SH3).
● An external fuse is installed on the
TRC-MW board. This fuse blows in
case of overcurrent. Replace the fuse
if it has blown.
● On the TRC-MW board, there is a
LED lighting up when each triac
driving is turned ON.
Checking the LED enables you to
locate the problem, whether it is on
the AC side or on the control side.
● Symbol for pre: PRE
● Symbol for print: PRN
● Symbol for post: AFT