iRobot Roomba Red - Appendix K: Power Supply Test Procedure

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Appendix K: Power Supply Test Procedure
For 1.25A FAST Power Supply
Equipment:AC Voltmeter, DC voltmeter, ammeter, variable voltage AC supply, power resistor (18 ohm 50 W for 1.25 A charging brick).
Method
1.
Plug power supply into variable voltage AC supply with AC voltmeter connected across AC supply. Connect resistive load across output of power supply,
with DC ammeter connected in series to measure current supplied to load. Connect DC voltmeter across resistive load and ammeter, so ammeter voltage drop
is included in voltage reading.
2.
Set AC supply voltage for 90 VAC. Failure if DC output voltage < 20 VDC or > 24 VDC; DC output current <1.0 A or > 1.45 A.
3. Set AC supply voltage for 240 VAC. Failure if DC output voltage < 20 VDC or > 24 VDC; DC output current <1.0 A or > 1.45 A.
4.
Disconnect power supply from AC supply. Set AC supply voltage for 60 VAC. Reconnect power supply to AC supply.
Failure if output current isn’t zero (power supply should shut down)
For 600mA SLOW Power Supply
Equipment:AC Voltmeter, DC voltmeter, ammeter, variable voltage AC supply, power resistor (37 ohm 25 W for 600 mA power supply).
Method
1.
Plug power supply into variable voltage AC supply with AC voltmeter connected across AC supply. Connect resistive load across output of power supply,
with DC ammeter connected in series to measure current supplied to load. Connect DC voltmeter across resistive load and ammeter, so ammeter voltage drop
is included in voltage reading.
2. Set AC supply voltage for 90 VAC. Failure if DC output voltage < 20 VDC or > 24 VDC; DC output current <1.0 A or > 1.45 A.
3. Set AC supply voltage for 240 VAC. Failure if DC output voltage < 20 VDC or > 24 VDC; DC output current <1.0 A or > 1.45 A.
4.
Disconnect power supply from AC supply. Set AC supply voltage for 60 VAC. Reconnect power supply to AC supply.
Failure if output current isn’t zero (power supply should shut down)