Seiko 7D56A - TECHNICAL GUIDE: INSPECTION AND MEASUREMENT; Measuring Current Consumption (Whole Movement)

Cal. 7D56A
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Technical guide
REMARKS ON INSPECTION AND MEASUREMENT
l
Value checking
1. Remove the RECHARGEABLE BAT-
TERY UNIT an INSULATOR and the
BATTERY CLAMP WITH SCREWS. and
then reassemble the OSCILLATING
WEIGHT WHEEL and OSCILLATING
WEIGHT, and tighten the SCREW tem-
porary in order to make the movement
ready for measurement.
2. Connect the (-) probe of the tester to
the input terminal (-) of the CIRCUIT
BLOCK and (+) probe to the CIRCUIT
BLOCK COVER A.
input terminal(-)
-
+
How to measure the current consumption for the whole movement
CIRCUIT BLOCK COVER A
3. Swing the OSCILLATING WEIGHT as
the Illustration for more than three
seconds so that the movement detects
the electricity generation and it turns
to the normal hand movement mode.
Note: When swinging the OSCILLATING
WEIGHT, take care so as not to
touch the probes of the tester.
4. Wait for more than 10 seconds until a
stable measurement is obtained, and
then read the measurement.
5. Make sure the read value is less than
0.70 μA.
* When measuring the current consumption using
the SEIKO digital multi-tester (S- 860), use the
range of
40 μ A of SUPPLY V (= 1.55 V) &
GATE TIME (2 S)
Oscillating weight
-
+