Wandel & Goltermann OLP-10 - Fault Localization. Component Level; Voltage Supply; +5 V Power Supply and -5 V Power Supply; Reference Voltage Generation (U70)

Service Manual OLP-101-15
6 Fault Localization, Component Level
6.1 Voltage Supply
Nominal battery voltage (point H02 to H03): 2.2 V to 3.5 V
6.2 OnIOff Control
Switching the instrument on
Turn on the instrument by pressing the ONIOFF key.
Point H03:
approx. -0.2
V (Q1 and then U1.2 are turned on)
U11 pin 12:
Delayed high after low (RESET)
Signal
CPFF-INIU11 pin 11
: High
Signal INT2/U11 pin 20: High
Permanent operation
Press the ONIOFF key for
>2 s at power-on.
Signal PERM_IN/U11 pin 10: <I
V after approx. 2 s.
Switching off the instrument
Turn off the instrument by pressing the ONIOFF key.
Signal CPFF-INIU 11 pin 11
:
Low pulses (Q2 on)
Signal INT2/U11 pin 20: Low after high
Reference point: Ground connection of C2 (analog ground)
6.3
+5
V Power Supply and -5 V Power Supply
Measure the supply voltages. Reference point: Ground connection of C2 (analog ground).
U2 pin
5: +5.00 V f 250 mV
U3 pin 5: -4.90 V
+ 250 mV
6.4 Reference Voltage Generation (U7)
Check the reference voltage for the A/D converter. Reference point: Ground connection of C2
(analog ground).
U7 pin 6:
+2.50 V+ 10 mV
U7 also supplies a voltage VTEMP (at U7 pin 3) which is proportional to temperature.
At 25 OC: VTEMP
= 690 mV; TC = +2.3 mV/K (all approximate values).
6.5 Battery Monitor (U6.2)
The LOW-BAT signal (U6.2 pin 5) goes from high to low if the voltage VBAT goes below 2.2 V.
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