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15
TECHNICAL GUIDE
Cal. 5J32A
III. VALUE CHECKING AND ADJUSTMENT
● Coil block resistance
Second coil block : 2.00 KΩ ~ 2.45 KΩ
Hour and minute coil block :
Coil for driving hands : 1.00 KΩ ~ 1.20 KΩ
Coil for detecting generation : 280 Ω ~ 360 Ω
Note: Measure the coil block resistance after installing each coil block to the movement, checking that
stable measurements may be obtained.
B
A
Patterns for checking
the coil for driving hands
a
b
* The motor driving the hour and minute hands uses a special driving system so that they move quickly
to indicate the current time immediately after the time relay function is activated. The hour and minute
coil block has two layers of coils, one for driving hands and the other for detecting generation, and it is
necessary to measure the resistance of each layer of coil.
• The illustration below shows the patterns to which the probes of the tester should be applied to measure
the resistance of the respective coils.
Patterns for checking
the coil for detecting generation
● Checking for leakage between coil for driving hands and coil for detecting generation
* If the hour and minute hands do not move properly when the time relay function is activated, that is, if
they remain stopped or will not move smoothly, check for the leakage between coil for driving hands
and coil for detecting generation. This checking is required only if such a problem is found.
If leakage is detected, replace the hour and minute coil block with a new one.
How to check the leakage
1. Make the tester ready for measuring the resistance.
2. Apply the probes of the tester to 1 “A” and “a”, 2 “A” and “b”, 3 “B” and “a”, and 4 “B” and
“b”, respectively, to measure the resistance.
3. If the four measurements obtained are all infinitely great, that is, if the resistance was unable to be
measured for all the four cases, there is no leakage between coil for driving hands and coil for
detecting generation. As a guideline, there is a leakage if measurements of less than 2 KΩ were
obtained.
● Generating coil block resistance
340 Ω ~ 440 Ω
Note: Measure the generating coil block resistance after installing it to the movement, checking that
stable measurements are obtained.