Service manual

6 Troubleshooting
6-4 SAM4S ER-900/SPS-300 SERIES
6-5 MAIN B’D Problem (LAN, USB, Serial)
6-5-1 LAN
 Cable NOT attached (Green LED of LAN connector does not turn on).
→ Check LAN cable. Refer to chapter 2 cable connection diagram.
→ For IRC (Inter Register Communication), It has to be used the cross cable.
→ For LAN, It has to be used the direct connection cable.
→ Check LAN RJ-45 modular jack insert right position..
→ Check the connection. Between I/F B’D and LAN Option B’D and Main B’D.,
 Communication fail occurs (Yellow LED of LAN connector does not blank).
→ Check LAN cable whether cable wire is open or not.
→ Check cable length. Based on LAN specification, the cable length has to less than 100M.
→ Check DM9161B chip and related circuit & component whether short or not.
→ Check the connection. Between I/F B’D and LAN Option B’D and Main B’D.,,
 Related System Clock.
→ Check the crystal, if it operates correctly or not.
→ Clock frequency is 25MHz.
6-5-2 USB
 USB device NOT attached and Communication fail occurs.
→ Check connection of Option Serial and USB B’D.
→ Check USB host whether it is broken or not.
→ Check related circuit & component whether short or not.
→ Check USB source voltage (VUSB).
→ Check the connection. Between I/F B’D and USB Option B’D and Main B’D.,
6-5-3 Serial (COM#1 ~ COM#4)
 Communication fail occurs.
→ If COM#3 or COM#4 is problem, check connection of Option Serial B’D (COM#3,#4).
→ Check communication setting parameter (Speed, Parity, Data Bit…etc,.)
→ Check the interface cable. Refer to Chapter 2 for cable connection.
→ Check the RS3232 driving voltage (+5.4V, -5.4V).
→ Check the connection. Between Main B’D and I/F B’D and Option Serial B’D.,
→ Measure +5.4V, -5.4V on main B’D. If -5.4V voltage level is less than -5.0V, it is OK.
→ Check related circuit & component whether open or not.
→ Check controller chip and related circuit. (COM#1/#2#3/#4→LPC2470)
→ Perform the loop-back test at self test mode. Refer to Chapter3 for loop-back connection.
 Scanner device NOT attached and Communication fail occurs.
→ The source voltage (+5V) for scanner comes out at COM#1,#2,#3,#4..
→ Check the power consumption of scanner. This product limits the power current;
→ Scanner is less than 300[mA]. (Recommend)
→ Check related circuit & component whether open or not.
6-5-4 SDCARD
 Operation Fail.
→ Performs the SDCARD test at H/W test mode.
→ Check the harness between SD B’D and Main B’D, if it is connected or not.
→ Check the 10-Pin harness, it is OK or not.
→ Check related circuit & component whether short or not.