==============================================================================
                             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.