Canon i9100, s520, s750, s820, s820d, s820mg, s830d, s900, s9000 서비스 매뉴얼

(1) Be careful not to get any grease on the timing slit strip.

If grease gets on the timing slit strip, its slits will not be read correctly, resulting in
error. If grease gets on the strip, use alcohol to remove it completely.

(2) Do not fold or scratch the timing slit strip.

If the strip is folded and a white line is created or if a slit is scratched, replace the
timing slit strip.

If the timing slit strip is contaminated with grease:
Determine the extent of grease contamination and choose the appropriate
method:
a) When there is only a small amount of grease (about 2 mm width)

Step 1: Wipe the strip clean using alcohol.
Step 2: Conduct a test print.
Step 3: Check once again that no grease remains on the strip.

b) When there is a significant amount of grease (greater than 2 mm width)

Step 1: In addition to Step 1 above, replace the carriage board
assembly (since there is the danger that grease may have come in
contact with the sensors on the board).
Steps 2 and 3, as above.

Use caution when removing or installing the logic board  to prevent possible damage
from short circuiting.
When the printer is turned off after use, the capacitor on the logic board will continue
holding a charge for some time. In this condition, shorting the components on the
logic board will damage the components.
Therefore as a preventive measure, follow step (1) or (2) below before removing or
installing the logic board.
(1) After disconnecting the AC power, wait for some time

S900/S820 : about 60 seconds
S750/S520 : about 90 seconds

(2) Use a resistance of about 100 to 500 ohms to short-circuit the capacitor terminals

for 1 sec.
S900 : C401
S820 : C411
S750 : C504
S520 : C582

S900 / S820 / S750 / S520