Pentax ASAHI SPOTMATIC 23102 Service Manual page 40

DEFECTS:
Correct exposure cannot
be obtained,
NOTE:
Pictures taken are either
extremely over-exposed
or under-exposed.
CAUSES:
1. The voltage of the battery is
getting low; perhaps not to zero,
but is below 1.3V.
2. Faulty indication of the needle
of the ammeter.
How to check it:
Push down the AM switch lever
(01069) to switch off the meter.
First, determine if the needle is
in the "off" positbon when the
camera is held at a right position.
Then determine the exact "off"
position of the needle by pointing
the camera to different directions,
viz., upward, downward, to the right
and then to the left. See to it that the
camera once reverted to and held at a
right position before turning it to any other
directions.
When the camera is turned to any of
these directions, the needle must
always rest at the right "off" position.
In the event the resting place of the
needle varies each time the camera
is turned, the ammeter may well be
considered faulty.
23102
SERVICING:
1. Replace the battery.
2. Replace the ammeter.
Page 39