Troubleshooting; Precautions; Troubleshooting Guide - JRC JHS-7 Instruction Manual

6. TROUBLESHOOTING

6.1 Precautions

(1) Exclusive wrench is needed to remove the
antenna from the radiotelephone. If the
removal is forced by any other means, the
antenna or the radiotelephone will be
damaged. Ask a nearest JRC dealer or branch
if the removal is necessary.
(2) Before making repairs or asking for repairs,
check fundamental matters such as operating
procedures and battery conditions.
(3) Unless having suitable measuring
instruments or qualification to make repair,
never disassemble this equipment.
(4) When disassembling this equipment, refer to
Figure 6-1.

6.2 Troubleshooting Guide

NO Trouble
1 CH indicator
does not light
during power
on.
2 No sound
comes out
although
BUSY lamp
is on.
3 BUSY lamp
off and no
voice heard.
4 CH16 lamp
blinks but
no voice
heard.
5 Tx lamp does
not light
during
transmitting.
6 Despite Tx
lamp lighting,
communication
unavailable.
Possible Counter-
cause measure
(1)Battery (1)Charge
discharged battery
(2)PS circuit (2)Check
failure voltages
(1)Speaker (1)Replace
wire break speaker
(2)Loose (2)Check
contact in connector
connector and speaker
(3)AF amp cable
failure (3)Check the
AF amp
(1)Squelch (1)Turn SQ
closed control
(2)IF amp fully
failure counter-
clockwise
(2)Check IF
amplifier
Synthesizer Check
failure synthesizer
Transmitter Check
failure transmitter
Using a Make sure of
different channel No.
channel.
Figure 6-1 Assembly Drawing of the Radiotelephone
11