6-46
2. Connect the CALIBRATOR output signal to the CH 1 BNC using one of the supplied 10X coded
probes. Set the 2430 VOLTS/DIV setting to 200 mV. Press SAVE on the 2430, then MENU OFF.
1. Press SAVE/RECALL SETUP and then press the fifth menu selection button to do a PANEL INIT.
Vertical Deflection Bad (Horizontal stripe only) or Horizontal Deflection Bad (Vertical stripe only).
Display Output (schematic diagram 18):DEFLECTION
PROBLEM
2. Check the collector of
0269
for a voltage swing of -131.8 V to -111.8 V as the EDGE FOCUS
pot is adjusted from one extreme to the other. Check the wiper of R300 for a voltage swing of 0
to 50 V as the pot is adjusted from one extreme to the other. If not correct, check the pot and the
+61 V supply.
1. Check the EDGE FOCUS adjustment.
Poor Edge Focus:
3. If the output of R400 tracks the display intensity changes, check R395, R297, C295, and P174.
2. Check the wiper of R400 for a varying voltage as the DISP INTENSITY is increased to high inten-
sity levels. If not correct, check Q500, CR500 and VR316 for shorts or opens.
1. Check the HIGH DRIVE FOCUS adjustment.
Poor Focus at High Intensity:
5. Check the intensity grid, cathode, and anode voltages for correct levels. If not correct, trouble-
shoot faulty circuit.
An HV probe is required for the following step.
WARNING
I
4. Check for -300 Vat the junction of R248 and R247. If not correct, check CR611, CR610, C618
and the 150 V peak ac supply.
3. Check at the collector of
0152
for a voltage swing of -175 V to -115 V as the FOCUS pot is
adjusted from one extreme to the other.
2. Check junction of R262 and R145 for a voltage swing of 0 to 15 V as the FOCUS pot is adjusted
from one extreme to the other. If not correct, troubleshoot pot, connectors between the pot and
the junction, and the 15 V supply to the FOCUS pot.
1. Check the ASTIG adjustment.
No Focus at Any Intensity:
If all the focus voltages and adjustments are correct in the following checks and proper focusing can-
not be attained, suspect a defective crt. Check all the crt voltages and EXT CAL Display ADJUSTS for
the crt to verify their accuracy before changing a suspected crt.
FOCUS
Check operation of the Readout State Machine.
2. No display is seen.
Table
6-6
(cont)
Maintenance-2430 Service
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