23
Subject to change without notice
3.13 Locate and identify delay line cable on YF board and make
a short across the delay line.
If the trace does not become visible, exchange the YF
board. Thereafter adjust item 24, 25 to 36 and 65 to 67
as described in the Adjustment Procedure.
If the trace becomes visible in the screen center, the YF
board has no error. Continue with item 3.14.
See photo C3.13
3.14 Exchange the YP board and make a complete oscilloscope
adjustment as described in the Adjustment Procedure.
3.15 Replace the CRT and make a complete oscilloscope ad-
justment as described in the Adjustment Procedure.
If the power supply is not defective, the crt
heater glows, the X plates are short circuited
and the Y plates are short circuited, the beam
must be visible as a spot in the screen center.
If not the crt cathode has no emission.
Item Instrument Behavior What to do
4.1 Analog and digital mode:
Trace(s) not focused (ap-
prox. 2 cm height) and
readout not readable
Replace the CR board to see if the trace can be focused. If this is the case a readjustment of item 5 (CRT
minimum intensity), 6 (Focus symmetry) and 7 (Astigmatism correction) are required as described in
the Adjustment Procedure.
Item Instrument Behavior What to do Remark
photo C3.13
HM1508-2 Troubleshooting
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