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Maintenance
760A / 760D / 760N
4–5
NOTE. The parts lists in this manual should be used when ordering replacement
parts.
Replacement parts are available from or through the local Tektronix, Inc., field
office or representative.
Changes to Tektronix instruments are sometimes made to accommodate
improved components as they become available, and to give you the benefit of
the latest circuit improvements developed in our Engineering Department. It is,
therefore, important when ordering parts to include the following information in
your order:
1. Part Number
2. Instrument Type or Number
3. Serial Number
4. Modification or Option Number (if applicable)
If a part that has been ordered has been replaced with a new or improved part, the
local Tektronix field office or representative will contact the customer concern-
ing any changes in the part number. After repair, the circuits may need
readjustment.
TROUBLESHOOTING INFORMATION
The following paragraphs describe information contained in ROMs in the 760A.
It is intended to help the technician isolate any problems that appear to originate
with the DAC.
The service switch, S340, selects different look–up tables in the scale–shaper
ROM. (Positions 8 & 9 are unused).
Position 0 selects normal scale.
Position 1 is the Expanded scale that is also enabled when the EXPAND SCALE
push button is depressed.
Position 2 an absolute linear scale used for DAC linearity checks which has 35
leading zero positions and two all–ones positions for markers.
Obtaining Replacement
Parts
DAC Servicing