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Emerson Process Management GmbH & Co. OHG 8-13
Instruction Manual
HASAxE-IM-HS
05/2006
8 Troubleshooting
8-4 Troubleshooting on Components
8-4-3 Measuring Points
8-4-3-1 Measuring Points at BKS Board
(Pin 1 of all connectors are marked within the
silk screen or by use of square pads)
Fig. 8-2: BKS Board (section),
measuring points
8-4-3-1-1 Supply voltage +6 V
Measuring Point: X14
Measuring instrument: DVM
Signal: + 6 V DC (+10 mV / -200 mV)
Failure: No or wrong signal
Potential cause:
a) Supply voltage missing
b) Supply voltage connected wrong
way round or is < 9 V
c) Fuse F2 broken (( 8-4-5,
pg. 8-19)
d) BKS board defective
8-4-3-1-2 Positive reference voltage
Measuring Point: X5, pin 6
Measuring instrument: DVM
Signal: + 5.535 V DC (± 60 mV)
Failure: No or wrong signal
Potential cause:
a) +6V voltage faulty
b) +3 V Reference voltage faulty
(measure at C179, pin 1
(lower pin in fig. 8-2))
How to solve:
a) Connect supply voltage
b) Check polarity or replace
power supply unit
c) Replace F2 (by same type !)
d) Replace BKS board
How to solve:
a) Check supply voltage
b) Replace BKS board
Measure all voltages against GND, available
at X11 and X28 !