Salter Brecknell CS-250 - Manual (Page 22)

CS-250 Series Chair Scales Service Manual
- 21 -
11.5. Check PCB Voltages
If the problem is in the PCB, use a multimeter to check the following voltages
11.5.1 AC Power
Check the AC power socket out put voltage.

Voltage must be a -20% and +10% of the normal AC voltage.
11.5.2 Adaptor Voltage
Check the adaptor output cable connecter voltage

Voltage must be minimum 9VDC and maximum 15VDC
11.5.3 PCB Input Voltage
Check the PCB input power connecter voltage

Voltage must be minimum 9VDC in to the pin AD+
11.5.4 Check Battery Voltage and Charging Voltage
1. Check the Battery Voltage,

Voltage must be minimum 6VDC. If below the 6VDC connect the adaptor
for charging

The battery voltage below the 5.5VDC, replace the battery and install new
6V/3.4Ah battery.
2. Check the Battery Charging Voltage;

Remove the battery connection terminals (Red and Black) from the battery.

Connect the power and turn on the scale

Voltage into the terminal minimum 6.5VDC
11.6 Trouble Shooting
Problems Possible cause Common Solutions
Display is blank.
No self test Mains power is turned
off. Power supply faulty
or not plugged. Internal
battery is not charged.
On/Off switch problem Check power is getting inside the
scale and on/off switch is working.
Verify the voltages, which is on the
power labels.
Blank display
after self test Pan not installed.
Unstable weight, load
cell damaged Check the pans are installed
correctly. Try to turning on again.