Texas Instruments BA-20 Profit Manager User Manual - Page 99
Accuracy Information, TVM, Cash Flow, and Bond worksheets:
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Error Possible Causes Error 5 No solution exists • TVM worksheet: the calculator computed I/Y when FV, (N Q PMT), and PV all have the same sign. (Make sure cash inflows are positive and outflows are negative.) • TVM, Cash Flow, and Bond worksheets: the LN (logarithm) input is not > 0 during calculations. • Cash Flow worksheet: the calculator computed IRR without at least one sign change in the cash-flow list. Error 6 Invalid date • Bond and Date worksheets: a date is invalid (for example, January 32) or in the wrong format (for example, MM.DDYYYY instead of MM.DDYY. • Bond worksheet: the calculator attempted a calculation with a redemption date earlier than or the same as the settlement date. Error 7 • Iteration limit exceeded • • TVM worksheet: the calculator computed I/Y for a very complex problem involving many iterations. Cash Flow worksheet: the calculator computed IRR for a complex problem with multiple sign changes. Bond worksheet: the calculator computed YLD for a very complex problem. Error 8 Canceled iterative calculation • TVM worksheet: $ was pressed to stop the evaluation of I/Y. • Amortization worksheet: $ was pressed to stop the evaluation of BAL or INT. • Cash Flow worksheet: $ was pressed to stop the evaluation of IRR. • Bond worksheet: $ was pressed to stop the evaluation of YLD. • Depreciation worksheet: $ was pressed to stop the evaluation of DEP or RDV. Accuracy Information The calculator stores results internally as 13-digit numbers but displays them rounded to 10 digits or fewer, depending on the decimal format. The internal digits, or guard digits, increase the calculator's accuracy. Additional calculations use the internal value, not the value displayed. Appendix - Reference Information 95