Sam4s SAP-630 Series, Service Manual

Page: 62 / 64

6 Troubleshooting
6-6 SAM4S SAP-630 SERIES
6-6 Main B’D problem (Boot, Thermal Printer, Feed motor, Auto-cutter)
6-6-1 Boot Flash ROM (MX29F800CBTI-70) problem of Main B’D
 Related RESET
→ Check the reset block (LM809M3X, U51) & 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.
→ If the boot program is erased during servicing, boot error is occurred.
6-6-2 Thermal Printer problem
 Print Operation Fail
→ Check the Flat cable between PRINTER and Main 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 Main B’D, if it is connected or not.
→ Check the Voltage.(+24V),
→ Check the Phase signal.
→ Check the Driver (TEA3718, U36,39) enable signal.
→ Check the sensor’s input.
→ Check related circuit & component whether short or not.
6-6-3 Auto-cutter problem
 cutting Operation Fail
→ Check the Flat cable between PRINTER and Main B’D, if it is connected or not.
→ Check the Driver (TEA3718, U41) enable signal.
→ Check the sensor’s input.
→ Check related circuit & component whether short or not.