CFG253 Performance Verification & Adjustment Procedures
Page 12 of 19 Procedure #: CP1005 Revision: A
Test Equipment requirements
The test equipment listed in the Table on Page 2 is a list of the equipment needed for
this performance check. All test equipment is assumed to be operating within
tolerance. Detailed operating instructions for test equipment are not given in this
procedure. If operating information is needed, refer to the appropriate test equipment
instruction manual.
Initial CFG253 Set-Up:
AMPLITUDE CCW
DC OFFSET Pushed In
SYMMETRY Midrange Detent
RANGE 1K
FUNCTION All Buttons Out
VOLTS OUT Button Out
FREQ/10 Button Out
SWEEP Button Out
SWEEP RATE Midrange
SWEEP WIDTH Midrange
FREQ DIAL 0.3
1. Set U1 Input Voltage
a. Set digital multimeter to DC mV range
b. Connect multimeter test leads to pins 2 and 3 of Integrated Circuit U1.
Note: Alternate Test Points
Locate R8 and R9 at the front left edge of the Main circuit board.
Pin 2 is connected to the end of R8 nearest the board edge. Pin 3 is
connected to the end of R9 furthest from the board edge.
c. Adjust R10 for approximately 0 mV.
2. Set Q5 Gate Voltage
a. Connect common lead of multimeter to ground and the positive lead to the wire
loop test point near gate of Q5. (on the Main board under rear edge of the
elevated Switch board).
b. Adjust R33 for approximately 0 mV.
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