Microprocessor Back-Up Lithium Battery Replacement; Ordering Spare Parts - Kenwood TR-851A Instruction Manual

Symptom Probable cause Action
Sensitivity is low.
RF GAIN knob is turned too far | Turn RF GAIN knob fully clockwise.
counterclockwise.
Signal is being received but no sound | Wrong mode.
is heard.
; Eee
No contro! works. LOCK is ON.
in disptay. (With the TR-851A/751A)
TUNING control does not alter frequency| COM switch is ON.
Enter another mode.
Press FUNC, F.LOCK keys.
Press COM, MR, or A/B key.
arr |
Beep does not stop after a numeric | Memory write operation is ON. The | Press numeric key 9 or 0.
key is pressed. unit is waiting for entry of split
memory transmit frequency.
after M key is pressed, no control | chanel.
works.
Frequency display is zero.
set mode is ON.
When ''—.———.-—*' is displayed | Nothing is stored in the memory | Press A/B key to set VFO mode.
DCL digital code set mode or call sign | Press CS key.
not increase or decrease the memory
channel! or displayed frequency. (The
switches select VFO or MR, and in-
itiate channel linkage.)
Memory cannot be backed up.
The microphone UP/DOWN switch will | FUNC and 0 keys are pressed.
Press FUNC and 5 keys.
Backup battery voitage is fow. 'See Section 5-5.
Transmit
Symptom
cause transmission.
does not answer. cy mismatch.
Probable cause Action
Qutput 1. Microphone jack is not plugged in.
2. Poor antenna connection.
In CW, pressing the key does not | 1. Key jack is not plugged in.
2. Poor key contact.
In USB, LSB, or CW, the called station | RIT causes send and receive frequen- | Press RIT switch to exit RIT mode.
1, Plug jack in.
2. Connect antenna securely.
1. Plug jack in.
2. Clean contact.
5-5. MICROPROCESSOR BACK-UP
LITHIUM BATTERY REPLACEMENT
Lithium battery replacement should be performed by
an authorized KENWOOD service facility; either your
KENWOOD dealer, or the factory, since this unit con-
tains CMOS type circuitry.
Notes; ——@—@—_—————————
1. When the lithium battery is replaced, the
microprocessor must be reset, using the pro-
cedure in Section 4-4-2.
When the lithium battery fails, the radio's
microcoded functions are not affected. Only in-
formation stored in memory will be creared.
ae
5-6. ORDERING SPARE PARTS
Model and serial number of your transceiver.
Schematic number of the part. Printed circuit board
number on which the part is located, part number
and name, if known, and quantity desired. Part
numbers for most replacement parts is contained in
the service manual (available as an option from your
dealer).