29
Subject to change without notice
Item
Behavior of the Instrument
Possible Reason / What to do
Remark
3-5.4
Replace the TB board as described in section Board Re-
placement.
If the trace is not visible, continue with item 3-5.5.
3-5.5
Replace the XY board as described in section Board Re-
placement.
Item
Behavior of the Instrument
Possible Reason / What to do
Remark
3-6.1
No Y defl ection or distorted Y
defl ection in all modes (Yt, XY
and Component-Tester).
Replace the XY board as described in section Board Re-
placement.
Item
Behavior of the Instrument
Possible Reason / What to do
Remark
3-7.1
One channel not present.
Switch the oscilloscope off.
Locate the long ribbon cable connecting the FC with the YP
board. Note the instructions of item 4 (FC Board) in the sec-
tion Board Replacement and remove the plug at connector
J2006.
Locate the short ribbon cable connecting the FC board with
the TB board. Note the instructions of item 5 (FC Board) in
the section Board Replacement and remove the plug at con-
nector P4002.
Connect the ribbon cables of a spare FC board and connect
them with J2006 and P4002. Set all potentiometers to midran-
ge position and release all pushbuttons (out).
Switch the oscilloscope on.
– If the missing channel is now visible,
continue with item 3-7.2.
– Otherwise continue with item 3-7.3.
The FC board replacement
enables a fast check of the
instrument control.
As the trace rotation coil
is still soldered on the
original FC board during
this procedure, the trace
will be tilted.
3-7.2
Replace the FC board as described in section Board Re-
placement.
3-7.3
Replace the YP board as described in section Board Re-
placement.
Item
Behavior of the Instrument
Possible Reason / What to do
Remark
3-8.1
No triggering
Switch the oscilloscope off.
Locate the long ribbon cable connecting the FC with the YP
board. Note the instructions of item 4 (FC Board) in the sec-
tion Board Replacement and remove the plug at connector
J2006.
Locate the short ribbon cable connecting the FC board with
the TB board. Note the instructions of item 5 (FC Board) in the
section Board Replacement and remove the plug at connector
P4002.
Connect the ribbon cables of a spare FC board and connect
them with J2006 and P4002. Set all potentiometers to midran-
ge position and release all pushbuttons (out).
Switch the oscilloscope on.
– If triggering is working now, continue with
item 3-8.2.
– Otherwise continue with item 3-8.3.
The FC board replacement
enables a fast check of the
instrument control.
As the trace rotation coil
is still soldered on the
original FC board during
this procedure, the trace
will be tilted.
H M 3 0 3 - 6 T r o u b l e s h o o t i n g
