Icom IC-28A Instruction Manual page 29

PROBLEM POSSIBLE CAUSE SOLUTION
1. Power does not come on | ePower cable is improperly con- | eCarefully reconnect power cable.
when the VOL/PWR CON- nected.
TROL is pushed ON. ePower connector is making | eCheck the connector pins.
poor contact.
ePolarity of the power connec- | eDisconnect the power cable,
tion is wrong. replace the blown fuse, then
reconnect the power cable observ-
ing proper polarity.
e Blown fuse. e Check for the cause, then replace
the fuse.
2. No sound comes from the | eVolume setting is too low. e Set volume to an appropriate level.
speaker. eSQUELCH CONTROL is set | eAdjust squelch so the noise from
incorrectly. the speaker is just quieted while
receiving no signal.
e External speaker is connected. eCheck that the external speaker
plug is inserted properly, and that
the external speaker cable is not
cut.
3. Sensitivity is low and only | eAntenna feedline is cut or | eCheck, and if necessary replace,
strong signals are audible. short circuited. the feedline.
4. No or low RF output. e The LOW position is selected | ePush the HI/LO SWITCH to select
with the HI/LO SWITCH. the HIGH output power position.
ePTT SWITCH on the micro- | eCheck the connector pins on the
phone is not operating due to MIC CONNECTOR.
poor connection of the MIC
CONNECTOR.
5. No modulation of the | ePoor connection of the MIC | eCheck the connector pins on the
transmitter. CONNECTOR. MIC CONNECTOR.
6. Frequency doesnotchange | e MEMORY mode is selected. e Select the VFO mode by using the
when the TUNING CONT- VFO/MR SWITCH.
ROL is turned.
7. An abnormal, out-of-band | eCPU malfunction. e Reset the CPU (microcomputer).
frequency is displayed on Refer to SECTION 5- 8.
the LCD READOUT. eLithium backup battery is | e Take your IC-28A/E to ап ICOM
exhausted. authorized dealer or service center.
8. Scan functions do not stop | eSQL/CHK CONTROL is set | ө Adjust squelch so the noise from
even when signals are incorrectly. the speaker is just quieted while
received. receiving no signal.
9. Memory channel frequen- | e ДЇЇ! memories are initialized | eRe-program the memory channels
cies change after resetting after the CPU is reset. after the CPU is reset.
the CPU.