Troubleshooting
025-9567E
59
INSTANT CALL KEY TEST
While the encoder continuous self-test is executing, the Instant Call panels will also execute
a continuous self-test. This Instant Call self-test can be changed to an Instant Call key test.
The Instant Call key test is initiated (only during continuous self-test) by holding down a key
on the Instant Call panel to be tested. The key will need to be held down for one complete
test cycle to be acknowledged. When the key test begins, the key pressed and the
CLEAR
key
of the panel will now begin to blink. The blinking indicates that the key test is now
executing. Now a press of a key whose LED is off will cause its LED to blink. A press of a
key whose LED is blinking will cause its LED to go off. In this way, the LED for the key can
be used to verify the functionality of the key. When the
RESET
key of the encoder is
pressed, the Instant Call panel will resume normal operation.
ENCODER FAULT IDENTIFICATION
Some possible problems and their probable causes are listed in the following table. Use this
information to assist in troubleshooting faults. A particular problem could be caused by a
component that may be on one of several circuit boards in the encoder. For this reason, the
name of the circuit board on which the suspect component resides is identified and will be
one of the following: Encoder Bd, Clock Bd, Front Panel Bd, Supply Bd, Driver Bd, or
Switch Bd (Instant Call panel switch board). The “ENCODER INSTALLATION” section
contains disassembly instructions and a diagram showing the physical location of each board
inside the encoder.
Fault Possible
Cause
Encoder does nothing when
powered on (no LEDs come
on).
Power missing or reversed or fuse, F1, blown.
Supply Bd. or power distribution cable bad.
Encoder Bd. oscillator not operational (U19, Y1, C49, C50).
Front Panel Bd. display not functioning (encoder operational but
display does not show it, check front panel cable).
Power too low (low power causes encoder to reset).
Break level at computer port (break causes encoder to be
reset).
Reset key shorted on Front Panel Bd. (also check cable).
Encoder Bd. reset circuit faulty (U17,).
Encoder illuminates some or all
segments or beeper repeatedly
clicks but self-test does not
execute.
Encoder Bd. microprocessor not executing software (,
U1-U2, U5-U7, U18-U19).
Front Panel Bd. display faulty (encoder operational but front
panel or cable bad).
Encoder Bd. display driver faulty (U8, J2, U19).
Status display apparently out of
control.
Front Panel Bd. display circuitry faulty.
Encoder Bd. display driver faulty (U9, J2,).
display driver faulty (U2, P5).
Cable between Front Panel and Encoder board bad.
Beeper will not sound or
continuously clicks.
Encoder Bd. beeper driver faulty (U8, U16, U17, J2).
Driver Bd. beeper circuit faulty (J3, C11, LS1).
Cable between Encoder and Driver boards bad.
Содержание Model 25
Страница 1: ...Model 25 Programmable Encoder Product Manual 025 9567E...
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Страница 16: ...Specifications 8 025 9567E...
Страница 36: ...Operation 28 025 9567E RELAY TIMING DIAGRAM...
Страница 62: ...Auxiliary Panel Installation 54 025 9567E...
Страница 72: ...Troubleshooting 64 025 9567E...