Tektronix 2212 Service Manual page 161

2212 Service Manual
Adjusbnent Procedures
c. Check: CRT Readout for TVL 17 Fl.
d. Set:
Trace INTENSITY to maximum for a viewable
display.
Check for a display like Figure 5-2 (NTSC) I Figure 5-3 (PAL).
Press: SLOPE to select Field 2.
Check that the Negative SLOPE LED is on
Readout: TVL 17 F2 (NTSC) I 330 F2 (PAL)
Check for a display like Figure 5-4 (NTSC) I Figure5-5 (PAL)
e. Rotate:
LEVEL fully ccw.
Check that the CRT Readout displays: TVL ALL,
a bright display and triggered on all lines with the vertical
sync.pulses running across the display.
f. Rotate: LEVEL slowly through its range.
Check that ALL LINES and line 1 (NTSC) I 314 (PAL) till
line 262 (NTSC) I 625 (PAL) can beselected.
g. Press:
SLOPE to select field 1.
Rotate: LEVEL slowly through its range.
Check that ALL LINES and line 1 till line 263 (NTSC)
I
313 (PAL) can be selected.
Step 5. Adjust CH 2 AC clamp (see Figure 5-6)
a. Set:
b.
Rotate:
c. Set:
Set:
d. Select:
Check:
Adjust:
Trigger MODE ........................... P-P AUTO
CH 2 INPUT Coupling .............. GND
VOLTS/DIV ............................... 0.1 V
LEVEL .....••...........•..................••
ccw
CH 2 POSITION so the trace is situated on the
graticule center.
CH 2 Input Coupling to AC.
Trigger MODE to TV LINES
A flat field from the TSG-100
CRT Readout for CH 2: "0.1V~C'
CLAMP OFFSET so that the black levelof the signal is
at the graticule center.
e. Change the input signal from minimum to maximum picture level.
Adjust: CLAMP GAIN so that the black level of the signal is at
the graticule center.
Repeat point d. and e. if necessary.
Revised 3/93
5-27