Minolta XE - 4 Adjustment of Rs and R

(A) Adjustment of Rs and Ri — Adjustment of low brightness and high brightness~
MMeasuring instruments:
: 081 standard circuit tester (Model SC-1) or constant-voltage DC power source Model E-1 or E-2
: Digital tester (Type 2507)
: Brightness bex (Model [.-222 or L-223)
: Power source adapter (081-4204-79)
: Standard lens (50mm F 1.4)
: Temporary cover for brightness calibration (081-1031-79)
: Secrew-driver for brightness calibration
Adjustment procedures:
1. As shown in the figure below, connect the measuring lead wires to IC terminals “6” and “7” of
the printed base plate A (0432) and set the camera to the measuring apparatus.
Measuring lead
wire for 1C "7"
Digital tester (Ranges: V}
Measuring lead
wire for IC "6"
Condition of the body Screw-driver for
to measure: hrightness calibration
* Distance ring:
*Pv button: depressed ;
(Py SW: ON} Temporary cover
Eve shitter: shut , for bright calibration
+ Shutter speed: AUTO
a source adapter
2. Adjustment of Rs
Set the brightness box at Ev 5 (ASA 100), wait about 1 minute, and according to the table
below make correction-for-temperature of Vso0 voltage obtained by attached data or calculat-
ing formula from the voltage between IC terminals “6” and “7”. Then turn Rs to coincide
with the value of Vavo (mV) which has been corrected. Voltage drops if Rs turned right and
it rises if Rs is turned left.
Digital counter POWER: OFF
A-CH
O81 standard circuit tester
—Correction for temperature of Vavo—
Ambient temperature | 10+2.5T | 15+2.50 | 20+2.5C | 2542.5 | 3042.50 | 3542.50 | 0+2.50
Correction value (mV) —13.5 | -9.0 | —4.5 0 44.5 | +9.0 +13.5
3. Adjustment of Ru
Set
the
brightness
box
at
Ev
15
(ASA
100),
wait
for
more
than
5
minutes,
make
correction-
for-temperature
according
to
the
table
below
of
the
voltage
value
obtained
by
the
attached
data
or
calculating
formula
from
the
voltage
between
IC
terminals
“6”
and
“7”,
Then
turn
RL
to
the
voltage
value
of
Vuvio
(mV)
which
has
been
corrected.
@
—Correction for temperature of Vav 10—
Ambient
temperature
10+2.5C
142.50
|
2042.50
|
2542.50
|
3042.50
35+2.5T
|
042.50
Correction
value
(mV)|
—4.5
~3.0
—1.5
0
+1.5
43.0
|
+45
* Adjust Rs and Ri repeatedly.