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The first scope shot shows the parabola 1 signal processing from its be-
ginning at IC1604/pin 4 (ch 1) to the QP coils (ch 3)
P M 3 3 9 4 , F L U K E & P H I L I P S
ch1
ch2
T
ch3
1
2
3
C H 1 ! 2 . 0 0 V =
C H 2 ! 2 . 0 0 V =
C H 3 ! 5 0 . 0 V = A L T M T B 5 . 0 0 m s P K D
W a v e fo r m D Q P 1 – P a r a b o la 1 P r o c e s s
N a m e
C h a n n e l 1
P a r a b o la 1
C h a n n e l 2
D r iv e r o u t p u t
C h a n n e l 3
S ig n a l a t Q P c o il
C h a n n e l 4
T im e b a s e
The second scope shot shows the parabola 2 signal processing from its
beginning at IC1604/pin 6 (ch 1) to the QP coils (ch 4)
P M 3 3 9 4 , F L U K E & P H I L I P S
ch1
T
ch2
ch3
1
ch4
3
2
C H 1 ! 2 . 0 0 V =
4
C H 2 ! 2 . 0 0 V =
C H 3 ! 1 . 0 0 V ~
C H 4 ! 1 0 0 V = C H P M T B 5 . 0 0 m s
W a v e f o r m D Q P 2 – P a r a b o la 2 P r o c e s s
N a m e
C h a n n e l 1
P a r a b o la 2
C h a n n e l 2
I n v e r t e r o u t p u t
C h a n n e l 3
D r iv e r o u t p u t
C h a n n e l 4
S ig n a l a t Q P c o il
T im e b a s e
c h 1 +
L o c a t io n
V o lta g e
I C 1 6 0 4 / p in 4
6 V p - p
I C 1 6 0 1 / p in 4
1 V p - p
C N 1 9 0 2 /p in 6
1 3 5 V p - p
5 m s e c /d iv
S T O P E N V
c h 1 +
L o c a t io n
V o lt a g e
I C 1 6 0 4 / p in 6
2 V p - p
I C 1 6 0 5 / p in 1
1 V p - p
I C 1 6 0 2 / p in 4
1 . 5 V p - p
C N 1 9 0 2 / p in 3
3 0 0 V p - p
5 m s e c / d iv
127
DQP Magnetic field Drive
The Dynamic Quadrapole correction signals were provide by parabola 1
and 2. The higher current used to manufacture the large magnetic fields
in the QP coils and introduce the lower 60 Hz frequency parabola signals
into the horizontal frequency scan are created by IC1603 and Q1605.
The source of this drive signal is comparator IC1603. It manufactures a
pulse to mark the areas of the screen that need to be corrected. The
circuit begins when a horizontal ramp is formed by C1616 at IC1603/pin 6.
The output of this comparator is a low pulse at IC1603/pin 7.
Because the pulse ends at the beginning of the next horizontal cycle, the
second comparator in IC1603/pins 2-1 is used to extend this low pulse
through the horizontal retrace interval. This second comparator inverts
the positive horizontal pulse and outputs it as a low pulse in parallel with
the first comparator output to keep the output low.
This low going output pulse begins just before the horizontal interval and is
applied to DQP driver Q1605.
and 2 signals to the right and left areas of the screen by permitting QP
correction current to flow through the QP coils at this time.
P M 3 3 9 4 , F L U K E & P H I L I P S
ch1
T
1
ch2
ch3
2
ch4
3
C H 1 ! 5 . 0 0 V ~
C H 2 ! 5 . 0 0 V =
C H 3 ! 1 0 . 0 V =
4
C H 4 ! 5 0 . 0 V = A L T M T B 5 . 0 0 u s
W a v e f o r m D Q P 3 – M a g n e tic f ie ld D r iv e
N a m e
C h a n n e l 1
F B T p u ls e
C h a n n e l 2
H r a m p
C h a n n e l 3
D r iv e p u ls e
C h a n n e l 4
Q P D r iv e s ig n a l
T im e b a s e
This drive signal applies the parabola 1
c h 1 +
L o c a t io n
V o lt a g e /d iv
F B T
N /A
IC 1 6 0 3 / p in 6
7 V p - p
IC 1 6 0 3 / p in 7
1 2 V p - p
Q 1 6 0 5 /D r a in
1 3 5 V p - p
5 u s e c / d iv
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