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TECHNICAL GUIDE
Cal. H024A
AC terminal
Tweezers
Switch spring
I. STRUCTURE OF THE CIRCUIT BLOCK
2. To reset the circuit of the watch with its case back
closed, press the buttons “A”,”B”, “C” and “D” at the
same time and hold them for 2 to 3 seconds until the
display becomes blank. Then release the buttons and
check that the display shows “12:00’00” AM, Sunday,
January 1st” .
* Before closing the case back, apply a small quantity of
sillicon oil to the contact portion of the case back with
the buzzer lead terminal (piezoelectric element).
3. Be sure to set the digital time first before setting the
analogue time, as the analogue section is governed by
the "second" of the digital section.
* For time/calendar setting, refer to the instruction booklet
of each caliber.
1. After the battery is replaced with a new one, or after the
battery is re-installed following the repairing
procedures, be sure to short-circuit the AC terminal of
the circuit block and the switch spring with conductive
tweezers to reset the circuit as illustrated at right.
II. REMARKS ON INSTALLING THE BATTERY
H024A
A
B
C
D
Upconverter coil
Crystal unit
AC terminal
Input terminal (–)
Buzzer output terminal
C-MOS-IC
Input terminal (+)
Coil output terminal
• The explanation here is only for the particular points of Cal. H024A.
• For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL
INSTRUCTIONS.”
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