home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Ham Radio 1997
/
WOHR97_AmSoft_(1997-02-01).iso
/
mods
/
kenwood
/
asb_text
/
asb0028.txt
< prev
next >
Wrap
Text File
|
1997-02-01
|
3KB
|
66 lines
==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 28
MODEL: DG-5
SUBJECT: REPAIR OF UNIT
1. Symptoms: Two dots on LED display
Check: Het input and VFO input connections (Dirty, intermittent,
missing.)
2. Display reading wrong frequency
Check: If display frequency is reading off by 2 MHz and last
four digits on display reading (894.9) check carrier input wire
(Dirty, missing, intermittent.)
3. No display or dim display
Check: 5v reg (IC power) not working or plated thru holes not
plated thru.
Above are common mechanical failures that occur with DG-5. We suggest
the following troubleshooting procedure:
Check:
A. Power all power supply levels.
B. Reference oscillator Q21 and divider chain IC5-11 (RF, waveforms, DC.)
C. Carrier, VFO and HET, also counter (When applicable) for RF, Waveforms
and DC levels; see service manual for proper levels.
Note: Operation of the circuits are essential before proceeding.
It's been Kenwoods experience that when problems do occur with the DG-5
that approximately 90% of the problems will be caused by insufficient
solder connections and not the actual components themselves.
Note: We suggest the following procedure if buffers, mixers and oscillators
are working properly: See service manual for proper levels.
Check:
A. All sloder connections (loose or cold.)
B. Solder all plated thru holes: 32 guage wire inserted in plated
thru holes takes approximately 30 minutes to do and is very,
very, effective.
Service Suggestion:
A heat gun and freeze spray often are very effective in locating cold
or not-plated thru holes.
A. Heat board with heat gun (expands board).
This often caused dormant or loose connection to appear.