SWF T1201 Checking And Adjusting

Checking and Adjusting the 5 Volt DC Power Supply
To adjust the 5 volt DC voltage on the SWF T1201 and T1501, you will
need a digital multi-meter and a small blade screwdriver, about 1/8
inch or smaller. MESA recommends using a plastic alignment tool
(pictured at right) instead of the screwdriver to minimize the possibility
of electrical shock or shorting of the power supply. These are available
at most electronic supply stores. The other tools used to disassemble
the machine to gain access to the power supply can be found in the
tool kit that came with your machine.

Check the Voltage

Before you adjust the voltage, you should check it to determine if it is within the acceptable range for
proper operation of your machine. To check the voltage you will need to remove the 3 thumbscrews
(fig.1) located on the back side of the control panel. Once these are
green and white wires. Since most test meters have tips that are too large to insert into the connector,
you will need two used needles to act as conductors to make it easier to test the voltage. With power
off, insert the two needles, one each into the connector where the green and white wires are located
(fig.3). Make sure the needles do not touch each other before proceeding.
Now turn the machine on and wait for it to power up completely.
Depending on your test meter, you may need to set it to read the
correct voltage. Some meters are auto-ranging and will only need to
be set to read DC (direct current) voltage. After that, the meter will
automatically determine the best range to view the current voltage.
Other meters may need to be set to read a range of voltage to display
an accurate reading. In this case, set the range to read the lowest
voltage greater than 5.0 volts.
for your machine. Turn off the machine and remove the needles in the connector. Close the panel and
replace the screws.
SWF Standard Single Head –T1201 and T1501
removed, you can swing open the
panel and locate the connector that
supplies the power to the control
panel (fig.2). This connector has
four wires that are colored red,
green, black and white. Some
machines may have a green striped
wire. Use this wire if your machine
has it. For testing the 5 volt DC
power, we will be using only the
Now carefully apply the red test lead
to the needle for the white wire and
the black lead to the needle for the
green wire (fig.4). Allow the meter a
few seconds to adjust and then read
the display (fig.5). For normal
operation, you should have a
reading of 5.03 to 5.08 volts. If your
reading is within this range, there is
no need to adjust the 5 volt power
th