Asahi Pentax ES Operating Manual Excerpts
BATTERY CHECK AND REPLACEMENT
A silver battery powers the TTL meter and electronic shutter. The power circuit is on only when you depress the shutter release (lightly for meter reading and completely for electronic shutter) with the shutter speed dial set at "AUTOMATIC". When not operating the camera, be sure to keep the shutter dial off the "AUTOMATIC" setting and set to any mechanical shutter setting, so that you prevent wasting battery power if the shutter release button is accidentally depressed.
The battery lasts about one year. To check its life, set the shutter speed dial at "AUTOMATIC", and push the black check button alongside the exposure factor control dial. If the meter needle drops to the notch facing "30", the battery has sufficient capacity. If it does not, replace the battery. (If you release the shutter at "AUTOMATIC" setting when the battery is dead, the shutter will operate at the mechanical speed of 1/1000 sec.)
For replacement, use Eveready #544 6V silver battery. Open the battery housing cover on the body front. When inserting, be sure that the
Caution: Do not throw a dead battery into fire, as it may explode. Also, keep beyond the reach of small children.
Reproduced for Historical and Reference Purposes by Paul M. Provencher http://whitemetal.com Not For Resale.
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