Kyocera TL Electro-X Handleiding

Kyocera Niet gecategoriseerd TL Electro-X

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Yashica TL Electro-X Service Manual
Table of Contents
* Foreword
* 1) Principles of Operation
o 1.1) Exposure readout circuit
o 1.2) Shutter Circuit
+ Principle of variation of the shutter speeds
+ Bulb exposure
o 1.3) ASA Film speed setting
* 2) Electical diagrams
o Schematic diagram
o Wiring diagram
* 3) Testing and measuring instruments
o Voltage stabilizer
o Insulating resistance m eter
o Focal plane shutter tester
o Standard light source
* 4) Method of Repair
o 4.1) Battery checker circuit
+ 4.1.1) Battery checker lamp fails to turn on
+ 4.1.2) Improper voltage range
o 4.2) Malfunction of the exposure readout circuit
+ 4.2.1) Both the "OVER" and "UNDER" indicator lamps fail to turn on
+ 4.2.2) "UNDER" indicator lamp turns on normally, but "OVER" lamp fails to
light, or "OVER" lamp functions normally, but "UNDER" lamp fails to turn on.
+ 4.2.3) "OVER" indicator lamp turns on continuously and "UNDER" lamp
fails to turn on.
+ 4.2.4) "UNDER" indicator lamp turns on continuously and "OVER" lamp
fails to alight.
+ 4.2.5) Adjustment of the exposure readout circuit.
o 4.3) Shutter circuit
o 4.3.1) Shutter speed
o 4.3.2) Shutter remains open
o 4.3.3) Shutter closes automatically at "B" setting
o 4.3.4) Adjustment of the shutter speed
Foreword
This manual contains matters necessary for repair and servicing of the Yashica TL
Electro-X.
The Yashica TL Electro-X incorporates the following functional features which make it
completely different from other focal shutter single-lens reflex cameras:
1. Thru-the-lens exposure readout system which does not require an exposure meter and
provides measurement of the correct exposure at stopped-down aperture through
preselection of either the lens aperture or shutter speed.
2. Electronic-controlled focal plane shutter affording an infinite range of intermediate
shutter speeds (and providing faithful function at 1/1000 sec. even when battery power is
exhausted).
Its exposure readout and electronic shutter systems follow the pattern of those featured in
the Lynx-5000E (14E) and Electro 35, and their merits are outlined in their respective
repair manuals. Generally speaking, therefore, the Yashica TL Electro-X can be said to
be an equipment which offer all advantanges of the above-mentioned cameras.
Principles of operation
The circuitry of the Yashica TL Electo-X can be generally classified into the exposure
readout circuit, shutter circuit and battery checker circuit. The exposure readout circuit
and the shutter circuits are linked to each other with the aid of a slide resistor.
A coaxial dual variable resistor is employed for this purpose. Its top section forms the
balancing resistor (VR-1), while its bottom section functions as the shutter speed resistor
(VR-2).
The circuit pattern consists of a combination of the exposure readout circuit of the Lynx-
5000E (14E) and the shutter circuit of the Electro 35, and correlation between the
functions of these two circuits is maintained through incorporation of the variable
resistor.
1.1 Exposure Readout Circuit
The intensity of the light controlled by means of the diaphragm (exposure reading
through stopped-down) is sensed by the two CdS sensors incorporated in the pentaprism
housing on both sides of the viewfinder eyepiece.
Being a photoconductive cell, the CdS serves to vary the resistance value at a ratio
inversely proportional to the intensity of light to which it is exposed.
Because the CdS and the BALANCING resistor (VR-1) are series connected, the voltage
from the power supply is affected by the degree of resistance offered by both and the
voltage equivalent to the VR-1 is applied to (T5)-(T1).
Both the OVER and UNDER indicator lamps fail to turn on (indicating correct exposure)
when the voltage range at (T5)-(T1) is between 0.6 V and 1.0 V. The OVER indicator
lamp turns on when the voltage rises above this level and the UNDER indicator lamp
alights when it falls short of this range. Consequently, the procedure for setting the
correct exposure (indicated by the OVER/UNDER lamps failing to turn on) consists of
adjusting the VR-1 to a setting where a voltage supply of 0.6 V to 1.0 V will be
maintained at (T5)-(T1) as against the CdS resistance value.
1.2 Simultaneously with the setting of the resistance value of the VR-1 through
exposure readout, the shutter speed resistor (VR-2) which is set coaxially is adjusted
accordingly.
The trigger switch (SW-5) is adjusted to "ON" position when the shutter is a.
charged.
When the shutter release button is depressed, the power switch (SW-2) on b.
the shutter side is turned on, setting the power supply to the circuit. At this stage,
however, the Tr6 and Tr7 are at "ON" position because Tr5 is turned off. Consequently,
the magnet functions to hold the rear sector of the shutter.
c. At the next stage, the trigger switch is turned off and the electric current
controlled by the setting of the shutter speed resistor begins to flow and the charging of
the condensor C1 starts. Immediately after the trigger switch is turned off, the front
shutter sector is activated mechanically and starts its function.
The electric potential of the condenser C1 rises gradually and, when it d.
reaches a given (approx. 2.4 V), the Tr5 turns on and, simultaneously with this, the Tr6
and Tr7 are switched off. This cuts off the supply of electric power to the magnet which
then loses its force of attraction, causing the rear sector to commence operation.
e. As soon as the rear sector completes its run over the entire picture area,
the SW-2 is turned off, thus cutting off the supply of the electric power to the shutter
circuit and completing the shutter operation.
Principle of variation of the shutter speeds
The shutter speed is decided through setting of the shutter speed resistor
(VR-2).
If, for instance, only a very low resistance is offered by the VR-2, a large flow of electric
current is supplied to the condenser C1, necessitating only a very short period of time to
charge it to full capacity. In other words, the terminal voltage of the C1 rises to a given
value within a very short period of time, causing the rear sector to start to function with
hardly any time delay and thus providing fast exposure. If, on the other hand, a high
resistance is offered, a restricted flow of electric current is supplied, requiring a
considerable period of time before the terminal voltage of the C1 can reach level and thus
providing long exposure.

Product specificaties

Merk: Kyocera
Categorie: Niet gecategoriseerd
Model: TL Electro-X

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