8662A Option H25
08862-92039
Page 8 of 17
On page 8-326, under PRINCIPLES OF OPERATION, add the following NOTE at the end
of the Monitors section:
NOTE
Due to the Option H25 modifications, when operating the instrument in the DFA
mode, certain malfunctions indicated by the front-panel STATUS light may not
represent true malfunctions. This occurs because information sent back to the
microprocessor when operating in the DFA mode is not the same as that originally
sent to the Frequency Output Board by the microprocessor. If the STATUS key is
pressed while operating the instrument in the DFA mode, one of the following status
errors will be generated: 18, 19, 20 or 22. These errors do not indicate a malfunction
during DFA mode; however, if any other status errors are generated then there may
be an instrument malfunction. To clear the first errors mentioned above, return the
instrument to the normal mode of operation and press the STATUS key. Any
STATUS errors generated while operating the unit in the standard mode can be
considered an indication of a malfunction and service may be necessary.
On page 8-327, on Service Sheet 13, replace Figure 8-338, P/O A2A4 Frequency Output
Board Block Diagrams, with the new Figure 8-338, P/O A2A4 Frequency Output/Direct
Frequency Access Assembly Block Diagram, on page 13 of this Insert.
Also on page 8-327, replace part of Figure 8-339, P/O A2A4 Frequency Output Board
Schematic, with the new partial Figure 8-339, P/O A2A4 Frequency Output/Direct Frequency
Access Assembly Schematic, on page 14 of this Insert.
Add page 8-327a, consisting of Figure 8-339A, A2A4A2 Direct Frequency Access Board
Component Locations, found on page 15 of this Insert.
Add page 8-327b, consisting of Service Sheet 13A, containing Figure 8-339B, P/O A2A4A2
Direct Frequency Access Assembly Schematic, found on pages 16 and 17 of this Insert.
Copyright 1986 - HEWLETT-PACKARD COMPANY - Spokane Division
24001 E. Mission Ave, Liberty Lake, WA 99019-9599 U.S.A.
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