Pentax LX Quick Help/Reference Manual page 3

42. Film chamber
43. Film rewind shaft
44. Film guide rail
45. Shutter curtains
46. Watch data film blind
47. Film blind thumb screw
48. Diopter adjustment screw
49. Sprocket
50. Film take-up spool
51. Back cover release pin
52. Back cover release lug
53. Film pressure plate
54. Rubber grip
55. Automatic advance contacts
56. Auto film rewind coupling
57. Base plate
58. Battery chamber cap
59. Tripod socket
60. Film transport relay pin
61. Film rewind/Multiple exposure button
62. Film transport rate control coupling
63. Film transport coupler
64. Rim of back cover
Batteries
Operating the Camera Without Batteries
When the LED shutter speed display no longer lights, batteries are dead. However, the LX camera incorporates an electro-mechanical shutter system
which allows the photographer to continue taking pictures over a broad range of shutter speeds even when the batteries no longer function due to
exhaustion or temporary failure from temperature extremes. Should battery failure occur while shooting within the camera's mechanical shutter speed
range (i.e., from 1/2000 second to "X") no interruption of camera operation will take place. However, should batteries fail while operating in the
"Automatic" exposure mode or within the electronically controlled shutter speed range (from 1/60 second to 4 seconds) the mirror will automatically lock
up as a warning.
To continue picture-taking, simply turn the shutter speed dial to any of the mechanically operated settings (1/2000 second to "X").
NOTE: Should you wish to save the exposure being made when the mirror lock-up occurred, before changing the shutter speed dial, first cover the lens
with the lens cap. Then, release the mirror as described above and press the film rewind/multiple exposure button at the base of the camera. Advance the
film and take the picture.
Inserting the Batteries
The electronic systems of your Pentax LX operate on two 1.5-volt mini
batteries which are packed separately with your camera. To insert the
batteries, first remove the battery chamber cap at the base of the camera by
inserting the edge of a coin and turning in the direction of the arrow. Place the
two batteries in the chamber as shown making sure the positive (+) sides face
up.
Replace the chamber cap and tighten securely.
Battery Check
After inserting the batteries it is often helpful to make a quick check to see if
batteries are inserted properly and the camera's electrical systems are
functioning. To check battery voltage, activate the camera's metering system
by pressing the shutter button partway and observe the viewfinder LED
shutter speed display. The shutter speed LED will glow continuously if
normal voltage is being supplied.
Low Battery Warning
When batteries become weak the viewfinder shutter speed LED will begin to
flicker. Although all electronic systems will continue to function accurately
until the display goes out completely, both batteries should be replaced
promptly to ensure uninterrupted operation of the camera's electronic
exposure controls.