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Fluke 43B Service Manual

Fluke 43B
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43B
Service Manual
7-10
Measure TEMP on N501 pin 5 (=X503 pin 6); TEMP senses the battery temperature.
Measure IBATP on X503 pin 3 (= N501 pin 9); IBATP senses the battery current.
4. +3V3SADC must be +3.3V (supplied by N501 pin 65). If not correct, check if the
+3V3SADC line is shorted to ground. If it is not, then replace N501.
5. SELMUXn (TP591, TP592, TP593) supplied by the D-ASIC must show LF pulses
(0V to +3.3V, 0.5...3 seconds period).
6. Check TP536, TP537, and TP534 for signals shown below (typical examples,
measured signals may have different pulse amplitude and repetition rate).
TP536: if at a fixed level, replace D531.
TP537: if not correct, trace signal to PWM circuit on the Digital part.
TP534: if at a fixed level, replace N531.
0V
500 ms
TP536
TP537
+3V
TP534
+0.5V
7.5.4 Keyboard
Proceed as follows if one or more keys cannot be operated.
1. Replace the key pad, and the key pad foil to see if this cures the problem.
2. Press a key, and check ROW0...5 (measure spots MS432..MS437) for the signal
shown below :
50 ms
500
µ
s pulsesPress key
0
V
+3.3
V
Release key
If no key is pressed the ROW lines are low if a battery is installed; if the 43 is powered
by the the mains adapter only, the lines are alternating pulsing and low.
3. Check COL0...3 (measure spots MS438...MS441) for a +3.3V level. Then press and
hold a key, and check the matching COL line for the signal shown below:
50 ms
500
µ
s pulsesPress key
0
V
+3.3
V
Release key
If not correct, check the connections from X452 to D471; replace D471.
For the ON/OFF key see 7.5.13.

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Fluke 43B Specifications

General IconGeneral
CategoryPower Quality Analyzer
InterfaceRS-232
Volts AC/DCYes
OhmsYes
ContinuityYes
Diode TestYes
CapacitanceYes
Harmonics MeasurementUp to 51st harmonic
DisplayLCD
Battery LifeApproximately 6 hours
Weight1.1 kg (2.4 lb)
Data StorageYes
Amps AC/DC0.1 to 1000 A (with clamp)
Power MeasurementW, VA, VAR, PF
Dimensions50 mm
Current Measurement RangeVia current clamp accessories (not built-in)

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