Sam4s SPS-500 SERIES Service Manual page 92

6-7 IO B'D problem (Boot, Thermal Printer, Feed motor, Auto-cutter)
6-7-1 Boot Flash ROM (A29F800UV) problem of IO B'D
 Related RESET
→ Check the reset block (74HC14, U24) & reset time (150 ~ 270ms).
 Related System signals (Address, Data, nCE, nOE, nWE)
→ Check these signals whether it short / open.
 Related System Clock
→ Check the crystal, if it operates correctly or not.
→ Clock frequency is 9.216MHz.
 Related boot Flash ROM program (A29F800UV)
→ If the boot program is erased during servicing, boot error is occurred.
→ Refer to chapter 3 for boot program recovery and download.
6-7-2 Thermal Printer problem
 Print Operation Fail
→ Check the harness between PRINTER and IO B'D, if it is connected or not.
→ Check the TPH voltage.(+24V),
→ Check the Control Signal on micom (data, clk, latch, strobe)
→ Check the Thermister of printer.
→ Check the ADC port of micom.
→ Check related circuit & component whether short or not.
 Feed motor Operation Fail
→ Check the harness between PRINTER and IO B'D, if it is connected or not.
→ Check the Voltage.(+24V),
→ Check the Phase signal.
→ Check the Driver (TEA3718, U19,22) enable signal (SPS-530)
→ Check the Driver (TEA471, Q11,Q12) enable signal (SPS-520)
→ Check the sensor's input.
→ Check related circuit & component whether short or not.
6-7-3 Auto-cutter problem
 cutting Operation Fail
→ Check the harness between PRINTER and IO B'D, if it is connected or not.
→ Check the Driver (TEA3718, U24) enable signal.
→ Check the sensor's input.
→ Check related circuit & component whether short or not.
SAM4S SPS-500 SERIES
6 Troubleshooting
6-7