Canon PowerShot 350 Service Manual - Page 72

PEDESTAL, adjusted

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Part 3: Repair Information 3.6 PEDESTAL PURPOSE: Adjusting the Pedestal Standard Level (Black Level). STANDARD: Pedestal Level: 30rnV (+10n-1V, -20mV) a Toms: • Data Transfer Unit Fig. 3-21 Pedestal Level (Black Level) • Oscilloscope • Dark Bag PREPARATION: 1) Cover the lens or place the camera in the dark bag. 2) Set the camera in Test mode. CMD $28 ADR $E01A DATA $41 RET CMD $20 ADR $EOFF DATA $50 RET *When "#50" is input, writing error results and "#60" is indicated, however, the camera manipulates the data as "#50". ADJUSTMENT: 1) Input the following data to the camera. CMD $60 ADR $3 DATA $67 RET 2) Adjust the pedestal level to 30mV (+10mV, -20mV) with the up and down cursor keys. At this time, the leading edge (a) and the falling edge(b) of the wave form should meet the standard. 3) Input the data determined at 2) to EEPROM. (Factory data: Min: $3D, Max: $87) CMD $38 ADR $13 DATA The data adjusted at 2). RET 3-22

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Part
3:
Repair
Information
3.6
PEDESTAL
PURPOSE:
Adjusting
the
Pedestal
Standard
Level
(Black
Level).
STANDARD:
Pedestal
Level:
30rnV
(+10n
-
1V,
-20mV)
a
Fig.
3-21
Pedestal
Level
(Black
Level)
Toms:
•
Data
Transfer
Unit
•
Oscilloscope
•
Dark
Bag
PREPARATION:
1)
Cover
the
lens
or
place
the
camera
in
the
dark
bag.
2)
Set
the
camera
in
Test
mode.
CMD
CMD
$28
$20
ADR
ADR
$E01A
$EOFF
DATA
DATA
$41
$50
RET
RET
*When
"#50"
is
input,
writing
error
results
and
"#60"
is
indicated,
however,
the
camera
manipulates
the
data
as
"#50".
ADJUSTMENT:
1)
Input
the
following
data
to
the
camera.
CMD
$60
ADR
$3
DATA
$67
RET
2)
Adjust
the
pedestal
level
to
30mV
(+10mV,
-20mV)
with
the
up
and
down
cursor
keys.
At
this
time,
the
leading
edge
(a)
and
the
falling
edge(b)
of
the
wave
form
should
meet
the
standard.
3)
Input
the
data
determined
at
2)
to
EEPROM.
(Factory
data:
Min:
$3D,
Max:
$87)
CMD
$38
ADR
$13
DATA
3-22
The
data
adjusted
at
2).
RET