6
Instruments and conventions for performing diagnosis and repair
3.4) Conventions
By convention, when a measurement has to be taken between
two points, for example
a
b
, the arrow point indicates
where to apply the
red tip
of the multimeter (a),while the
black
tip
is applied at the other end
(b).
When a double arrow appears between two measuring points
(e.g.:
c
d
), the voltage to be measured is alternating (nor-
mally at 50 Hz), therefore it does not matter in which order the
multimeter terminals are applied.
In drawings and tables, when a voltage measurement appears
referring to terminals of components such as DIODES, BJT,
MOSFET and IGBT, the multimeter is used in "diode test" mode
(these measurements are always taken with the machine swit-
ched off and normally give values in the range +0.10 … +0.90
Vdc). In this case the following symbol is affixed beside the
value to be measured
Junction measurement (multimeter in "diode test" mode)
The following symbols will be used in the same way:
AC or DC voltage measurement (multimeter in voltmeter
mode)
Resistance measurement (multimeter in ohmmeter mode)
Current measurement (ammeter clamp or shunt + multi-
meter in millivoltmeter mode)
The measuring conditions (power source on/off etc.) are always
clearly indicated beside the values to be measured.
The connector terminals are indicated by the name of the con-
nector followed by a slash and the number of the terminal; for
example CN1/2 indicates terminal 2 of connector CN1.
Unless otherwise specified, all the measurements must be per-
formed with the boards fitted, together with their connections.
This manual refers to the last updated version of
the power sources and component electronic
boards. As the modifications introduced are very
slight, there should be no problem in identifying
the corresponding points to be tested also in the
boards of the previous version. In the event of difficulty, con-
tact Selco Service.
Remember that the first of the tests to be perfor-
med is the VISUAL CHECK!
The visual check reduces troubleshooting times
and directs any subsequent tests towards the
damaged part!
Summary of Contents for Genesis 90
Page 1: ...REPAIRS MANUAL Genesis 90 E N G L I S H...
Page 17: ...6 WIRING AND CONNECTION DIAGRAM 6 1 Genesis 90...
Page 19: ...18 PC boards location 7 PC BOARDS LOCATION...
Page 20: ...PC boards location 19...
Page 24: ...8 3 Thermal devices connectors locations Description of diagnostic indications 23...
Page 25: ...24 Description of diagnostic indications...
Page 45: ...11 AVAILABLE SPARE PARTS 44 Available spare parts 56 01 090 GENESIS 90...
