Welch Allyn GSI 38, Service Manual

Page: 38 / 96

CALIBRATION PROCEDURE
CONFIG. REGISTER: Durinq routine Calibration it is not necessary to program the
Confiq. Register.
Programming the Config. Register establishes the microprocessors
mode of operation and once programmed should never change. If a new
microprocessor is
installed in location XU7 or XU34 its Config. Register must be
programmed. To program the Config. Register install temporary jumpers (shorts) on
JP1 and JP3 then power up the unit. Almost immediately after power up the unit will
display Config. Register Programmed. At this point power down and remove the
previously installed jumpers. The Config. Register is now programmed.
DEFAULT DATA LOADING: Durina routine calibration it
is not necessary to load
Default Data.
Defautt Data Loading allows the technician to quickly store an averaged
set of calibration values into EEPROM. Also, if a new microprocessor has been
installed the Default Data loads critical power-up information that the processor requires
for operation into EEPROM. When a new microprocessor or Auto/Tymp Board is
installed Default Data should be loaded. Load Default Data by setting Dip Switch
positions 6, 7, and 8 to the “ON” position. Set the Cal/Norm Switch to the Cal Mode,
then power up the unit. At power-up the display should indicate the unit model and
version number (GSI 38 Version X), the Tymp/Reflex Software Revision Number
(Tymp/Reflex Rev XXX), the Audiometer Software Revision Number (Audiometer Rev
XXX), and the Default Parameters which are currently being loaded into EEPROM
(Loading Audiometer Defautts, Loading Programmed Defautts, or Loading Tymp/Reflex
Defaults). When the Default Data Loading sequence is complete the display will update
to the Main Calibration Mode Menu. At this point Dip Switches 6, 7, and 8 should be
returned to their normally OFF position.
The technician may also load an individual set of Default Data by first setting the
desired Dip Switch to the ON position then setting the Cal/Norm Switch to the Cal
Mode position. Dip Switch assignments are as follows:
Dip Switch
Function Location Loaded
6
Tymp/Reflex Defaults
7 Audiometer Defaults
8
Programmed Defaults
Tymp EEPROM
Audio EEPROM
Audio EEPROM