Service Manual

Testing and Measuring Instruments
The use of the following instruments is recommended in inspection and repair of
the Yashica TL Electro-X:
Voltage Stabilizer
This instrument is indispensable to assuring high efficiency in repair and
servicing. It is advisable to use a voltage stablizer featuring a voltmeter and ampre-meter
that provides ready checking and reading of the output voltage and current. Moreover, teh
use of a battery tool and lead wires featuring clips at one end is recommended. By
installing the battery tool in the battery chamber in place of the mercury battery, electric
power can be supplied readily from the voltage stabilizer.
Insulating Resistance Meter
This instrument which features an exclusive resistance scale permits reading of
resistance over a range of several megohms to several hundred megohms and is
employed in the same manner as an ordinary tester. Since it uses a high voltage power
(approx. 500V), however, utmost precaution must be exercised to prevent adverse effect
on other circuits. In the course of use of this insulating resistance meter, particular care
must be taken to protect the transistors from the high-tension supply.
Focal Plane Shutter tester
This instrument permits varied types of tests and measurements of the function of
the focal plane shutter, including the shutter speed (at the top, center and bottom of the
picture area), speed of operation of the front and rear sectors of the shutter, and time-lag
of the X flash synchronizer contact.
Standard Light Source
The standard light source is used for checking the exposure readout circuit. It is
advisable to incorporate this standard light source in the light value tester which is
generally used for testing and repair.
Methods of Repair
4.1 Battery checker circuit
4.1.1 Battery checker lamp fails to turn on.
4.1.1.1 Malfunction of the battery checker switch (SW-3).
Undertake continuity test by employing a tester.
4.1.1.2 Burn-out of the lamp filament.
4.1.1.3
Remove either one of the lamp terminals (brown or green) from the amplifier unit and
test the lamp for continuity with the aid of a tester. If no continuity is determined, it is an
indication of a lamp blow-out, necessitating lamp replacement.
4.1.1.3 Improper contact of the battery checker voltage regulating
resistor (1K ohm semi-fixed resistor) and malfunction of the transistors.
Install the battery, set the SW-3 to "ON" position and check the voltage of (T11) to (T1).
If the voltage is determined to be about the same level as that of the power source, it is an
indication of either an improper contact of the 1K ohm VR or a malfunction of the
transistors.
In this case, check the soldered ends of the 1K ohm VR. If both the soldered sections are
found to be in order, replace the amplifier unit.