Zenith ZVM-121 Service Manual page 12

Page 3-4
B+ ADJUST (R709) Adjustment - Measure the B+ voltage at R709. See
Figure 3-3. TheB+ voltage should be set at 12.7 VDC.
This 10 k!l potentiometer is soldered to the left-hand
side of the chassis PC board. See Figure
3~3.
~
B+
ADJUST
(R7091
'---------~T-,,\\\\\\\\-1\------J
VERTICAL VERTICAL HORIZONTAL
SIZE HOLD HOLD
Figure 3-3
CRT
CONNECTOR