Fresenius Medical Care 2008K2, Руководство по устранению неисправностей

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2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
Page 408
d)
CAUTION!
Due to the time consuming work that may be performed if
the following resistance reading is misinterpreted proceed VERY carefully.
Do NOT read just
the meter’s numeric display, read ALSO its UNITS (“Ω”,
“KΩ”, “MΩ”) AND the location of its decimal point!
e) Measure resistance at TEST connector pin 4 (4 pins from left). More than 75.0
Ω
(0.075 K
Ω)?
Yes More than 75.0
Ω! See procedure number
CR- 1.0.20 (page 408).
No
Way less than 75.0 Ω. Possible -12 volt short. One of the card cage boards (which can be
isolated by removing them one at a time and measuring resistance until pin 4 is more than 75
Ω. After all boards have been removed and the measurement is still less than 75 Ω the
motherboard may be bad.
CR- 1.0.20 ISOLATE NEGATIVE TWELVE VOLT PROBLEM
Per Figure 4A and NOTE A (page 9), proceed according to how the machine is equipped ( 1) Old OR 2)
New Style Power Logic Board :
1) IF Old Style Power Logic Board: Replace the Convertor board * with a known good or with a
known good New Style Power Logic Board and remove the Convertor board*
2) IF New Style Power Logic Board: Replace it with a known good New Style Power Logic Board
1
OR
with a known good Old Style Power Logic Board AND Convertor board*
* CAUTION! To avoid damage, the ‘Convertor board’ MUST be installed with the ‘solder side’ towards
the front of the machine AND matched pin for pin to the TEST connector.