Tektronix 4010 Maintenance Manual page 51

value written on shield for same CRT, or to value
midway between fade-positive and dropout for
replacement CRT. Re-adjust OP LEVEL as necessary
to avoid fade-positive after erase cycle, or drop out
from fully written page.
7. Cursor Brightness Check/Adjustment
(R28, Cursor Brightness on TC-l in pedestal)
Page 4-15
Adjust R28 for desired non-storing Alpha cursor
intensity .
8. Corner Focus Check/Adjustment
Page 4·15
(FOCUS ADJUST on High Voltage and Z
Axis Board in display unit)
Adjust FOCUS ADJUST for sameness of diagonal legs
of K written in corner of display. Compromise for
sameness in four corners.
9. Alpha Focus Check/Adjustment
Page 4-16
(R20-Alpha Focus, on High Voltage and Z
Axis Board in display unit)
Adjust Alpha Focus for center-screen focus of
K.
10. Crosshair Cursor Intensity Check/
Adjustment [R29 (R85 on boards numbered
670-1729-04 and lower}-Cursor Brightness
on TC-2J
Page 4-16
Adjust R29 (R85 on boards numbered 670-1729-04 and
lower) in Gin Mode so that the cursor is visible, but does
not store.
11. Vector Focus (R 10-Vector Focus, on
High Voltage and Z Axis Board in display
unit)
Page 4-16
In pseudo vector mode, adjust Vector Focus for
sharpest curved lines positioned near center of display.
12. Vector Drawing Time Check Page 4-16
2.6 ms negative-going pulse at pin 2 on Deflection Amp
and Storage Board following entering of A at
keyboard.
13. Vector Dynamic Geometry Error Check Page 4-16
®
Enter PAGE CTRL SHIFT M Space RUBOUT Space_
7 RUBOUT 7 _ and then check for
~1.5%
deviation
from mean straight line.
Adjustment-4010 Maintenance
14. Vector Parallelism Page 4-17
Enter PAGE CTRL SHIFT M Space RUBOUT Space
@
7 RUBOUT Space
@
7 RUBOUT ? _ Space RUBOUT
? _
Space RUBOUT Space
@
and check that the
difference between horizontal lines is
~2%
of vertical
line length and that the difference between vertical
lines is
~2%
of horizontal line length.
15. Control Character Response Check
Page 4-17
Check control character response as outlined in step 15
of the detailed procedure.
16. (4010-1 Only) Hard Copy Interrogate
Pulse Width Check/Adjustment (HC
INTERR on Deflection Amp and Storage
Board in pedestal)
Page 4-18
Adjust HC INTERR for 300 ns pulses on pin 4 of
Deflection Amp and Storage Board.
17. (4010-1 Only) Hard Copy Amplitude
Check/Adjustment (HC Y AMP, HC X AMP
on Deflection Amp and Storage Board in
pedestal)
Page 4-18
Adjust HC Y AMP for scan 1/4 inch below and 1/8
inch above page full of written characters; adjust HC X
AMP for scan 1/8 inch beyond left and right edges of
page full of written characters.
18. (4010-1 Only) Hard Copy Intensity
Adjustment (Hard Copy Intensity on side of
display unit)
Page 4-19
Position Hard Copy Intensity just below level at which
the Hard Copy scan bar stores.
19. (4010-1 Only) Hard Copy Damping
Check/Adjustment (R21-Hard Copy
Damping on Hard Copy TARSIG Amplifier
Board in display unit)
Page 4-19
Observe at TP32 on Hard Copy TARSIG Amplifier
Board during Hard Copy scan. Adjust Hard Copy
Damping for maximum negative-going pulses with
minimum ringing.
4-5