Sam4s SPS-500, Service Manual

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6 Troubleshooting
SAM4S SPS-500 SERIES 6-5
6-5 MAIN B’D Problem (LAN, USB, Serial)
6-5-1 LAN

Cable NOT attached (Yellow 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.
→ There are 5 RJ-45 Connectors. One is for LAN, the others are for serial RS-232 communication.

Communication fail occurs (Green 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 DM9000B chip and related circuit & component whether short or not.
6-5-2 USB

USB device NOT attached and Communication fail occurs.
→ Check USB device whether it is broken or not.
→ Check USB version. This product supports USB 1.1 version.
→ Check related circuit & component whether short or not.
→ Check USB source voltage (+5V) for HID (Ex ; Mouse, Keyboard, Scanner…etc,.)
6-5-3 Serial (COM#1 ~ COM#4)

Communication fail occurs
→ Check communication setting parameter (Speed, Parity, Data Bit…etc,.)
→ Check the interface cable. Refer to Chapter 2 for cable connection.
→ Check the RS232 driving voltage (+12V, -12V).
→ M12V, -12V on main B’D. If -12V voltage level is less than -7.0V, it is OK.
→ Check controller chip and related circuit. (COM#1/#2 → SC32440A, COM#3/#4 → TL16C752B)
→ Perform the loop-back test at self test mode. Refer to Chapter3 for loop-back connection.

Source voltage for Scanner & Rear VFD does not come out
→ 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.