Kenwood Troubleshooting Tips for TH-78A and TH78A Models
Page 58

TROUBLESHOOTING

The following problems are generally caused by improper transceiver operation or connection, not by defective components.

If you experience any of these problem causes and corrective actions before requesting service.

Symptom

Probable Cause

Corrective Action

Indicators do not light and no

1. Low voltage.

1. Recharge/ replace the battery.

receiver noise is heard when the

2.

With optional DC cable:

2.

1) Check cables and connections.

POWER switch is turned on.

 

1) Bad power cable or

 

 

 

connections.

 

2) Check for the cause of the

 

 

2) Blown power supply fuse.

 

 

 

 

 

blown fuse and replace the fuse.

 

 

 

 

No sound from the speaker.

1. Squelch is closed.

1.

Turn the SQL control

No signal can be received.

2. With the TSU-7: CTCSS is

 

counterclockwise.

 

 

operating.

2.

Press the F key, then press the 3

 

 

 

 

 

 

key to turn off the CTCSS.

 

3.

DTSS is operating.

3.

Press the F key, then press the 2

 

 

 

 

key to turn off the DTSS.

 

4.

Paging is operating.

4.

Press the F key, then press the 1

 

 

 

 

key to turn off the Paging.

 

 

 

 

No control works.

1. LOCK is ON.

1.

Press the F key, then press the M

 

 

 

 

key.

 

2.

T.ALT is ON.

2. Press the F key, then press the 5

 

 

 

 

key.

 

 

 

Memory channel cannot be

Nothing is stored in the memory

See Using the Memory (page 19)

recalled.

channel.

 

 

 

 

 

 

Memory cannot be backed up.

1. Battery voltage is low.

1.

Recharge the battery.

 

2.

Battery case removed.

2.

Install the Battery case.

 

 

 

 

 

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Contents TH-78A Contents Dual Tone Squelch System Dtss Accessories Before OperationControls Overview Key Page Page Receiver Operation Tuning Control and Volume ControlGetting Started Separate tuning control function Separate volume control functionReturning to the original mode Selecting a Frequency Direct Keyboard Frequency Entry12.5 62.5 37.5 87.5 Step Size Selection Using the Tuning ControlChanges in the Displayed Frequency Programmable VFO Tuning Limits VFO tuning range 144.000 145.000 146.000 147.000 Basic Receiving FunctionsTransmitter Operation Changing Transmitter Output PowerTo transmit, follow these steps Output Powerwatts Time-Out-TimerTX. Stop Function Initializing The Memory Using the MemoryMicroprocessor Memory Backup Memory ChannelEntering Normal Simplex/Repeater Channels Memory ContentsEntering Memory Data Clearing a Memory ChannelEntering Split Channel Frequencies Entering The Call Channel FrequencyRecalling Memory Channels Using the numeric keypadMemory Shift Memory Channel Character Display Function SettingMessage Display Cancel Character registrationHold/Resume Programming Scan operation cancelScanning Hold/Resume SelectionScan Options Scanning Memory ChannelsBand scan Programmable Band ScanMHz Scan Confirming Scan LimitInitiating Programmable Band Scan VFO/Memory Scan11 V/M/CVFO/Memory/CALL Scan CALL/VFO ScanCall / Memory Scan Alert FunctionAutomatic Offset Selection Repeater OperationTransmitter Offsets Selecting the Offset DirectionManual Offset Selection Reverse FunctionSelecting Tone Frequencies Tone OperationTone Function Operating Autopatch Operations Selecting Delay TimeTo activate the keypad Dtmf Memory Recalling Stored Dtmf Codes in Receive ModeStoring Dtmf Codes Operation AS a Repeater Making a Dtmf CallCtcss Operation Operating the Ctcss FunctionDtss Code Using the Dtss FunctionDual Tone Squelch System Dtss Selecting Dtss CodesPaging Operation Overview Setting Paging Codes Paging Code MemoryGroup Communication Network Example Sending Pages CallingCalling All Group Members Code setting mode Paging mode Calling a Specific Group MemberReceiving a Page with an Individual Code Receiving Pages WaitReceiving a Page with a Group code Locking Out Codes Canceling Signal SquelchCanceling signal type squelch Answer-BackMessage Transmission and Reception Using the Message MemoryMemory write procedure Message Transmission ModesLnpu t Key Message Memory Transmission Dtss modeMessage Memory Check Message ReceptionReceive Message Memory Paging modeReceive message memory clear Tone Alert System Enhanced Receiver FunctionsSelecting a Beep Sound Lamp MonitorBeepOff Key LockVolume adjustment when you use an earphone CAUT/ONTo simultaneously receive two UHF band signals To simultaneously receive two VHF band signalsAutomatic Band Change Function Single Band Operation MHz ModeChannelized Frequency Display Automatic Power Off APO Power Saver FeaturesBattery Saver Mode Battery Save Time SelectionTime Alarm Setting Time SettingTimer Function Switch-on Timer SettingTimer Start/Stop Switch-off Timer SettingAlarm Function Duplex Operation Changing Power-on Message Power on Message and Function MessagePower On Message Function Message250MS 450MSGeneral Information MaintenanceService Record KeepingTroubleshooting Optional unit Battery charger SMC-31 SMC-34 TSU-7 ME-1DVB lNVlSIS3tl LNflOk-4 13AIMS Installing the Ctcss Unit TSU-7 Memory Expansion Unit ME-l Programming the SMC-33 Remote Control Speaker Microphone Memory Control Functions Press the key below Press the F key, then Key belowUsing Other Microphone Specifications GeneralQuick Reference To do this PressThen f2 To do this

TH78E, TH-78A specifications

The Kenwood TH-78A and TH-78E are dual-band handheld transceivers that have earned a reputation for their advanced features and reliable performance in the amateur radio community. These transceivers are designed to operate on both the VHF and UHF bands, making them versatile tools for communication across different frequencies.

One of the standout features of the TH-78A and TH-78E is their dual receive capability, which allows operators to monitor two frequencies simultaneously. This is particularly useful for those who need to keep track of multiple communication channels, providing flexibility during operations. The transceivers also support a wide frequency range, ensuring compatibility with a diverse array of communication channels.

Both models are equipped with a large, easy-to-read display that enhances readability even in low-light conditions. The display provides essential information, such as frequency, channel, and battery status, ensuring operators can quickly access important data while on the move. An adjustable backlight further aids visibility in dark environments, making these radios a reliable choice for night operations.

The Kenwood TH-78A and TH-78E are known for their robust audio performance. They utilize advanced audio processing technology that enhances sound clarity, allowing for clear communication even in noisy environments. Additionally, the transceivers support a variety of digital modes, including CTCSS and DCS, which enable users to communicate securely by encoding their transmissions.

With a built-in 1000 memory channels, users can store and easily access their favorite frequencies. This extensive memory capability simplifies the task of switching between channels, making it easier for amateur radio enthusiasts to program and manage their communications. Furthermore, the radios feature programmable function keys that allow users to customize frequently used settings for quick access.

The TH-78A and TH-78E also come with a built-in GPS receiver, which is particularly beneficial for outdoor activities and emergency communications. The GPS functionality allows users to transmit their location coordinates, making it easier for others to locate them in case of emergencies.

In conclusion, the Kenwood TH-78A and TH-78E are powerful and versatile handheld transceivers that cater to amateur radio enthusiasts and professionals alike. Their dual-band operation, dual receive capabilities, comprehensive memory options, and advanced audio performance make these radios suitable for various communication needs. Whether for casual use or emergency situations, the TH-78 series remains a reliable choice for effective and efficient communication.
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