Sam4s SPS-500, Руководство по обслуживанию

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6 Troubleshooting
6-2 SAM4S SPS-500 SERIES
6-2 Power problem
6-2-1 Verifying the power supply
 Checking AC power cord.
 Checking the power switch whether it is on or not. It is located the right side of product.
 Checking the fuse (250V, 3.15A) on IO B’D.
 Separate the power harness between SMPS and IO B’D.
And measure the DC output voltage on SMPS (+24V)
 If it does not go out, please replace the SMPS.
 If it output voltage is ok, check next.
6-2-2 Verifying the IO B’D power line
 Checking the power LEDs on IO B’D, if it is on or not.
 If the power LEDs are off, It must be short between power line and ground. (VDD5V)
In this case, power off and separate the SMPS, MAIN B’D, LCD B’D and measure the resistance
between power line and ground.
 Measure other voltage.(Ex : VDD3.3V, VDD1.8V, Vserial)

If these voltages above mentioned do not go out, check the appropriate regulator or component.
And check power line is short or open.
6-2-3 Verifying the MAIN B’D power line

The main B’D source voltage (VDD5V) is supplied the IO B’D
 Checking the power LEDs on main B’D, if it is on or not.
 If the power LEDs are off, It must be short between power line and ground. (VDD3.3V)
In this case, power off and measure the resistance between power line and ground.
 Measure other voltage.(Ex : VDD1.3V, VDD2.5V)

If these voltages above mentioned do not go out, check the appropriate regulator or component.
And check power line is short or open.
6-2-4 Verifying the LCD B’D power line

The LCD B’D source voltage (VDD5V) is supplied the IO B’D
 Checking the power LEDs on lcd B’D, if it is on or not.
 If the power LEDs are off, It must be short between power line and ground. (VDD5V)
In this case, power off and measure the resistance between power line and ground.
 Measure other voltage.(Ex : VLCD3.3V,VDD3.3V, VLVOLT4.2V)
 If these voltages above mentioned do not go out, check the appropriate regulator or component.
And check power line is short or open.
NOTE :
During servicing & repairing, Be careful against receiving an electric-shock.