Seiko 5M84A - Technical Guide - Coil Resistance and Generation Check; Checking Coil Resistance; Checking Automatic Generating System

Cal. 5M84A
18/21
TECHNICAL GUIDE
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Value checking
• Coilresistance(coilblocks)
Check the resistance of each COIL BLOCK if they are within the range in the following table.
COIL BLOCK
4002516
1.7 K
Ω
- 2.1 K
Ω
GENERATINGCOIL
BLOCK
4002514
280
Ω
- 380
Ω
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Checking the automatic generating system
1. Apply the probes of the tester as shown in
the illustration, and measure the voltage of
the RECHARGEABLEBATTERY. The obtained
voltageiscalledthe“initialvoltage”.
Notes:
* When applying the minus probe of the
tester to the RECHARGEABLEBATTERY,
take care not to short-circuit the lead
terminal (-) and the RECHARGEABLE
BATTERYCLAMP.
* If a short-circuit has occurred, leave
the watch untouched for more than 10
minutes,andmeasurethevoltageagain,
checking that a stable measurement is
obtained.
2. Closethecasebacktentatively,andswingthe
watch from side to side 200 times at a rate
of 2 to3 swings asecond, making an arc of
approximately 20 cm.