Brother BAS-342G Service Manual page 72

6. ASSEMBLY
<Measuring the tension>
1. Move the Y arm (1) forward (in the direction of the arrow) as far as it will go.
2. Use a tension gauge (2) to measure the tension at the middle of the lower belt while referring to "Measurement position" in
the illustration.
* Check that the value for the belt tension is within the following value ranges.
[For a new belt: 650 to 750 N; For a reused belt: 520 to 600 N]
* Be sure to use a belt tension gauge to measure the belt tension, and measure from the middle of the lower belt.
* The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 50 mm and a span length of
333 mm.
* It is recommended that you use the Yunitta U-505 tension gauge.
63
Microphone
position
(Lower belt)
Microphone
position
(Lower belt)
BAS-342G
Finger pressing
position
(Lower belt)
Finger pressing
position
Middle of belt
(Lower belt)
[Measurement position]
1284B
1285B