AEG 3500 - Needle Thread Tension Adjustment; Looper Thread Tension Adjustment

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It is necessary to adjust the thread tension for the seams shown below.
[ ADJUSTING THE NEEDLE THREAD TENSIONS ]
[ ADJUSTING THE LOOPER THREAD TENSIONS ]
The left needle thread tension is too loose.
The right needle thread tension is too loose.
The lower looper thread is tight and/or
the upper looper thread is loose.
The upper looper thread is tight and/or
the lower looper thread is loose.
Loosen the lower looper thread tension
and/or tighten the upper looper thread
tension.
Loosen the upper looper thread tension
and/or tighten the lower looper thread
tension.
Tighten the left needle thread tension.
Tighten the right needle thread tension.
Back side
Front side
Back side
Front side
Front side
Front side
Back side
Back side