Gambro AK 95, Service Manual

Page: 130 / 247

6:3
AK 95 / AK 95 S Service Manual
HCEN 9138 Rev. 10.2005
Calibrations
CPU Testpoint Ref Tetspoint Circuit board Limits (mV)
CPU-C TP 6 TP 5 Control Driver board 45.00 - 55.00
CPU-P TP 1 TP 2 Protective Driver board 45.00 - 55.00
CPU-W TP 3 TP 4 Protective CPU board 4500 - 5500
MM 95 R 24 R 24 MM I/O board 45.00 - 55.00
AD Converters
1. Start the AK 95 S, enter the Service menu
and select Calibrations.
2. Choose AD-converter.
When selecting “AD-Converter” from the display
with the SET knob and press key following
display appears:
SELECT AD-CONVERTER
CPU-C CPU-P CPU-W MM95
3. Select an AD-converter with the SET knob
and press key.
CPU X AD LOW REF SET HIGH
xx.xx mV xx.xx xx.xx xx.xx
4. Measure the voltage (using a 4.5 digit
voltmeter), between following testpoints or
across the resistor:
TP 6
TP 5
CPU C driver board
CPU C A/D ref
AD ref voltage range:
45.00 to 55.00 mV
Buzzer
TP2
Z0VAD
PVREF
TP1
AD ref voltage range:
45.00 to 55.00 mV
CPU W PROM
CPU W
SafeRAM
TP4
Z0VRW
TP3
WREF
AD ref voltage range:
4.500 to 5.500 V
R24
MM I/O AD ref voltage range:
45.00 to 55.00 mV
pH plug
(TP1)
(TP2)
5. Set the “AD REF VOLTAGE” on the
display to the value shown on the voltme-
ter and press .
6. Press
START
UF
STOP
to load the value into the
EEPROM.
CPU X AD-REF VOLTAGE STORED
7. Press to exit.