Problem Isolation - Epson FilmScan 200 Service Manual

5.1 PROBLEM ISOLATION

The FilmScan 200 has a sophisticated, built-in self-diagnostic function that reduces troubleshooting time
by identifying failed components.
The following tables show motor resistance ratings and sensor test points.
Motor
Main Scan Motor
Preview Motor
Sensor
Photo Interrupter A
(Main scan HP)
Sensor
(Preview scan HP)
Micro switch board A
(Detect APS Holder
Installation)
Micro switch board B
(Detect front cover
Open/close status)
Rev. A
Table 5-1. Motor Coil Resistance
Table 5-2. Sensor Status
Check Terminal
Pin 2 of CN8
Pin 1 of CN4
Pins 6 and 7 of CN4
Pins 1 and 2 of CN12
Coil Resistance
APPROX. 8 ohms
APPROX. 83 ohms
Signal Level Status
High (+5 V) Inside of home position
Low (GND) Outside of home position
High (+5 V) Inside of home position
Low (GND) Outside of home position
Open APS holder is not installed.
Close APS holder is installed.
Open Front cover open
Close Front cover close
TROUBLESHOOTING
5-1