Epson DFX 8500 Service Manual page 76

DFX-6500
13. Paper width sensor
Cl Detection form: Photo reflector
0 Output form
:
Emitter follower
0 Judgemwnt : No paper present: Standard vottage level.
Paper present: The voitage level is double the standard voltage level.
14. CR motor isolation resistance sensor (monitored by pelt AN2 of the CPU)
To provide information about the CR motor life, the analog port (AN2) of the CPU checks the isolation
resistance every time the printer is turned on. If the isolation resistance is equal or less than 2.2 K ohms, a
carriage error is detected and the printer beeps.
15. PSB/PSE Board power off sensor (signal interface)
When the +37 VDC line voltage drops, the PSB/PSE board sends a HIGH POFF signal to the C204 MAIN
board.
2-24
Rev. A