Toshiba MMY-MUP0721FT6P-UL Service Manual page 207

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
No. of indoor
units from
which signal is
received
normally
E06
E04
— —
No. of indoor
units from
which signal is
received
normally
E04/E06 E06
— E07 —
Duplicated
indoor address
E08 E08
Location
Description System status
of
detection
I/F Dropping out of All stop
indoor unit
Indoor unit Indoor-outdoor Only specified
communication indoor units stop
circuit trouble
Indoor unit Indoor-outdoor All stop
communication
circuit trouble
(E04)
I/F Dropping out of
indoor unit
(E06)
I/F Indoor-outdoor All stop
communication
circuit trouble
(detected at
outdoor end)
Indoor unit Duplicated All stop
I/F indoor address
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Check code detection
Check items (locations)
condition(s)
Condition 1 • Check power supply to
All indoor unit initially indoor unit.
communicating normally (Is power turned on?)
fails to return signal for • Check connection of
specified length of time. indoor-outdoor
communication cable.
Condition 2 • Check connection of
Outdoor I / F board communication connectors
SW103, Bit4 : OFF on indoor P.C. board.
(Factory default) • Check connection of
communication connectors
on outdoor P.C. board.
• Check for failure in indoor
P.C. board.
• Check for failure in outdoor
P.C. board (I/F).
Condition 1 • Check power supply to
Indoor unit initially indoor unit.
communicating (Is power turned on?)
normally fails to return • Check indoor-outdoor
signal for specified power-on sequence.
length of time. • Check indoor address
setting
• Check wiring of Indoor-
outdoor communication
wires
• Check outdoor terminator
resistor setting (SW100,
Bit 2).
• Check power supply to
One indoor unit or more
indoor unit.
initially communicating
(Is power turned on?)
normally fails to return signal
• Check indoor-outdoor
for specified length of time.
power-on sequence.
(detected when power is
• Check indoor address
turned on)
setting
• Check wiring of Indoor-
outdoor communication
wires
• Check outdoor terminator
resistor setting (SW100,
Bit 2).
• Check power supply to
indoor unit.
(Is power turned on?)
Display on main remote
• Check connection of
controller.
indoor-outdoor
Indoor units unavailable for
communication cable.
indoor / outdoor
• Check connection of
communication. :E04
communication connectors
Indoor units available for
on indoor P.C. board.
indoor / outdoor
• Check connection of
communication. : E06
communication connectors
Communication system, if
on outdoor P.C. board.
the termination resistance
• Check for failure in indoor
is not set in any of the
P.C. board.
indoor units.
• Check for failure in outdoor
P.C. board (I/F).
Signal cannot be transmitted • Check outdoor terminator
from outdoor to indoor units resistor setting (SW100,
for 30 seconds continuously. Bit 2).
• Check connection of
indoor-outdoor
communication circuit.
More than one indoor unit • Check indoor addresses.
are assigned same address. • Check for any change
made to remote controller
connection (group/
individual) since indoor
address setting.