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9. The waveforms should look like those illustrated in Figure 10-10. If the waveform at
J201
pin 14 is bad, troubleshoot the Y line generator (function block I of A2 controller
schematic, sheet 1 of 4).
10. If the waveform at U210D pin 14 is bad, troubleshoot the Z output circuit (function block
M of A2 controller schematic, sheet 1 of 4).
11. Remove the jumpers.
10.0
V/div
0.00 v 1.00
ms/div
0.000 s
J201-14
UZIBD-14
SK199
Figure 10-10. Delta Y Waveform
Analog Zero-Span Problems (Non-Option 007)
1.
On the spectrum analyzer, press
(PRESEI),
[Wi,
ZERO SPAN ,
(e),
(iJ,
[ms,
LCAL),
MORE, and CRT
ADJ
Pattered
.
2. Set an oscilloscope to the following settings:
Amplitude scale
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
V/div
Sweep time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lms/div
Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External
3. Externally trigger the oscilloscope off the signal at A2U207 pin 8 (LBRIGHT).
4. The display should be similar to Figure lo-11 except that the untriggered trace should
show at the left edge of the screen. In these settings,
DEFl
causes switching between the
line generators and the analog inputs (sweep and video).
DEFl
remains high when the
CRT adjust pattern is on. Refer to function block M of the A2 controller schematic, 1 of 4.
5. The sweep input from Jl-41 should go’from 0 V to
+lO
V; the video In signal should go
from about 0 V to 1 V from the bottom to the top of the screen. Apply a dc voltage to
A2J4,
Video In, to test the circuit.
6. In Figure 10-11, there is no synchronization between
DEFl
and the video patterns X POS
and Y POS when
DEFl
is TTL high. The Y POS level when
DEFl
is low is the Video In
level.
lo-12
Controller Section