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Service manual M695
M695 Fault finding
Doc code 636 718
09/93 3077-HWE
Focus control
Select microscope side A or B:
•
Select A or B, depending on which side the zoom works incorrect
•
Select A if the fault appeares on both sides, A and B.
Action
Reading
Reaction
Possible fault
FOCUS SPEED
set min.
focus speed
1.25 . . . 1.27V
set max. focus speed 5v +-5%
FOCUS UP
FOCUS DN
/footswitch
non-actuated
>4.75V
<0.2V
/footswitch
non-actuated
>4.75V
<0.2V
Voltage ok, but
reacts incorrect
Microscope
(Focus servo,
wiring)
Separate microscope
from the testbox and
check signals
see above
Voltages ok
Microscope
(short circuit on
Focus servo or
wiring)
Bridge swingarm with
servicecable and verify see above
Voltages ok Swingarm-
signals
cable
Voltages not ok
Control unit