4ghz troubleshooting guide – Spektrum SPMAR9310 User Manual

Page 9

interpreting this as unfriendly noise. Moving the system away from metal

objects or moving the transmitter away from the receiver and powering

the system up again will cause a connection to occur. This only happens

during the initial connection. Once connected the system is locked, and

should a loss of signal occur (failsafe), the system connects immediately

(4ms) when signal is regained.

3. Q: I’ve heard that the DSM system is less tolerant of low voltage. Is

this correct?

A: All DSM receivers have an operational voltage range of 3.5 to 9.6 volts.

With most systems this is not a problem as in fact most servos cease to

operate at around 3.8 volts. When using multiple highcurrent draw servos

with a single or inadequate battery/power source, heavy momentary

loads can cause the voltage to dip below this 3.5-volt threshold causing

the entire system (servos and receiver) to brown out. When the voltage

drops below the low voltage threshold (3.5 volts), the DSM receiver must

reboot (go through the start-up process of scanning the band and finding

the transmitter) and this can take several seconds.

4. Q: Sometimes my receiver loses its bind and won’t connect requiring

rebinding. What happens if the bind is lost in flight?

A: The receiver will never lose its bind unless it’s instructed to. It’s important to

understand that during the binding process the receiver not only learns the

GUID (code) of the transmitter but the transmitter learns and stores the type

of receiver that it’s bound to. If the transmitter is put into bind mode, the

transmitter looks for the binding protocol signal from a receiver. If no signal

is present, the transmitter no longer has the correct information to connect

to a specific receiver and in essence the transmitter has been “unbound”

from the receiver. We’ve had several DX7 customers that use transmitter

stands or trays that unknowingly depress the bind button and the system

is then turned on losing the necessary information to allow the connection

to take place. We’ve also had DX7 customers that didn’t fully understand

the range test process and pushed the bind button before turning on the

transmitter also causing the system to “lose its bind.”

If the system fails to connect, one of the following has occurred:
• The transmitter is near conductive material (transmitter case, truck bed,

etc.) and the reflected 2.4GHz energy is preventing the system from

connecting. (See 2nd question above)

• The transmitter was put into bind mode knowingly (or unknowlingly)

causing the transmitter to no longer recognize the receiver.

2.4GHz Troubleshooting Guide

Problem

Possible Cause

Solution

Aircraft will not

“throttle up”but

all other controls

seem to function

User did not lower

throttle trim and throttle

stick prior to initializing

the aircraft

Lower throttle stick and

throttle trim to their lowest

settings

Throttle channel is

reversed. Futaba

transmitters (equipped

with Spektrum modules)

may require you to

reverse the throttle

channel

Reverse throttle channel

on specific transmitter if

applicable

LED on aircraft

remains flashing

and cannot be

controlled by

transmitter

User did not wait at

least 5 seconds after

powering the transmitter

prior to connecting the

flight battery to the

aircraft

Unplug, then reconnect

flight battery

User bound the aircraft

to a different transmitter

Rebind aircraft to your

desired compatible

transmitter

Transmitter was too

close to aircraft during

the initialization process

Move transmitter

(powered on) a few feet

from the aircraft prior to

reconnecting the flight

battery

Controls appear

to be reversed

after binding

to a different

transmitter

User did not initially set

up transmitter prior to

binding to the aircraft

See the “Binding” section of

this manual

Aircraft does

not function

after connecting

flight battery and

aircraft smells

burnt

User may have

accidentally plugged the

flight battery in with the

wrong polarity

Replace the receiver board

and ensure the RED polarity

marks are facing the same

direction when connecting

the flight battery to the

receiver board