Service
Manual
OLS-01-10
Fault Localization, Component Level
General Notes
Caution when performing measurements: the potential of the LED casing is not ground but
VBAT.
Voltage Supply
Nominal battery voltage (points H05 to H06):
2.2
V to 3.5 V.
OnlOff Control
Switching on the instrument
Turn on the instrument with the ONIOFF key.
Point H05: approx. -0.2 V (first Q3 then U3.2 are turned on)
U1 pin 12:
Low after high edge (RESET)
Signal OFF-OUTIU1 pin 20: High
Signal CPFFIU 1 pin 11
:
High
Permanent operation
Hold down the ONIOFF key for >2 s at power-on.
Signal PERM-INIU1 pin 10:
el V after approx. 2 s
U1 pin 21:
Low
(=>
Q7 disabled)
Switching
off
the instrument
Turn off the instrument at the ONIOFF key.
Signal
CPFFIU 1 pin 11
:
Low pulse (Q4 on)
Signal OFF-OUTIUI pin 20: Low
Reference point: ground connection of C6
+5
v
Supply
Measure the supply voltages. Reference point: Ground wnnection of C6.
U2 pin 5: +5.00 V 250 mV
Battery Monitor
The signal BLINK-IN (U2 pin 2) goes from HIGH to LOW if the voltage VBAT e 2.2 V.
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