Tektronix SDA601, Service Manual

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Maintenance
5- 8 SDA 601 Serial Digital Analyzer
d. Factory Reset see page 3--6
5. Flash Diags.
a. Checksum Memory — Press ENTER to calculate a checksum of all 512
Kbytes of flash memory. The calculation will require approximately 7
seconds.
Typically, you will use the next three flash diagnostic items ( b , c , and d )
together to confirm that the instrument can erase, read, and write to flash
memory. A useful approach is to:
H
Read byte 1000 (
b
);
H
erase sector 1, which begins at byte 10000 ( d );
H
read byte 10000 ( b ) to confirm the erase (the byte value should be FF);
H
then write a new value into the byte ( c ); and finally
H
read it back ( b ), to confirm the write.
b. Read Byte 10000 — Press ENTER to read the content of byte 10000.
c. Write Byte 10000 — Enter a number from 0 to 255 with the number
keys (see Figure 5--2), then press
ENTER
.
d. Erase Sec 10000 — Press ENTER to erase sector 1, which begins with
byte 10000.
e. Read SLM Cals — Developed for use during design and manufacture;
not intended for use in the field.
f. Write Byte Loop — Developed for use during design and manufacture;
not intended for servicing the instrument. Pressing
ENTER
will put the
SDA601 into an infinite loop; switch the instrument Off to exit the loop.
6. Calibration.
a. Calibrate SLM see page 4--2
b. Adj Serial Pot see page 4--4
c. Show Curr Temp — Press ENTER to check the internal instrument
temperature in “A/D units,” not degrees F or C.
d. Set Manuf Watch — Developed for use during manufacture; not
intended for servicing the instrument. Pressing
ENTER will initiate
special, undocumented Watch-mode “conditions.”