Canon MultiPASS C755 Service Manual - Page 112

D-RAM Test, 2.4 CS tests, 2.3 D-RAM tests

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MultiPASS C755 Chapter 3: Maintenance & Service 7.2.3 D-RAM tests Pressing the 1 button from the test mode menu selects the D-RAM tests. D-RAM Test 1 writes data to the entire D-RAM region and reads it out to check that operations are correct. D-RAM Test 2 just reads data at high speed. Replace the SCNT board if an error occur. Operating 1:D-RAM 6848K VVV. . . . .VVV 6848K: D-RAM total memory capacity (bytes) V : Indicates an address for which write testing is complete. . : Indicates an address for which read testing is complete. Error Normal end Complete (no err) WRT : data written RD : data read ADR : address Error display WRT= 33CC RD= 3333 ADR= 2800 Restart by pressing START/COPY key. Error display Complete (err) Figure 3-29 D-RAM Test 7.2.4 CS tests Pressing the 2 button from the test mode menu selects the CS tests. ADJ LED TIME is used to adjust the CS LED lights-on duration and enter the contact sensor's shading data (pre-scan operation). REFERENCE Details on CS LED lights-on duration adjustment, see 3.1 CS LED Lights-on Duration Adjustment on page 3-6. Tests [2], [3], [4] and Tests [5] are not used in the field. 3-61

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3-61
MultiPASS C755
Chapter 3: Maintenance & Service
1:D-RAM
6848K
Complete
(no err)
6848K: D-RAM total memory capacity (bytes)
: Indicates an address for which write testing is complete.
. : Indicates an address for which read testing is complete.
Operating
Normal end
WRT= 33CC RD= 3333
Error
Error display
Restart by pressing
START/COPY key.
Error display
WRT : data written
RD :
data read
ADR : address
.
.
.
.
.
ADR= 2800
Complete
(err)
REFERENCE
7.2.4 CS tests
Pressing the
2
button from the test mode menu selects the CS tests.
ADJ LED TIME
is used to adjust the
CS LED lights-on duration and enter the contact sensor’s shading data (pre-scan operation).
Details on CS LED lights-on duration adjustment, see
3.1 CS LED Lights-on Duration
Adjustment on page 3-6
.
Tests [2], [3], [4] and Tests [5] are not used in the field.
Figure 3-29 D-RAM Test
7.2.3 D-RAM tests
Pressing the
1
button from the test mode menu selects the D-RAM tests.
D-RAM Test 1 writes data to
the entire D-RAM region and reads it out to check that operations are correct.
D-RAM Test 2 just reads
data at high speed.
Replace the SCNT board if an error occur.