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Modifications for the Kenwood TR-7200
  Service notes on TR-7200A  
     
RECEIVER
  1. No squelch: Check C84 47uf on X55-1110-11.
  2. Intermittent receive: Check for D14 touching to ground on X55-1110-11.
  3. Both Q17, Q18 audio transistors burned up: Send for bulletin before replacing.
  4. Poor receiver sensitivity: Check for proper output of Q10 10.245 MHz stage. If it is defective replace xtal.
  5. No receiver audio noise: Check L23 discriminator coil.
  6. No receiver: No C9 voltage at X55-1110-11.
  7. Receiver sensitivity poor: Check D2 MI301.

Transmitter
  1. Distortion on audio TX: Bad Q8 TA7061 IC.
  2. No TX HI: Check for shorting terminals at HI/Low switch.
  3. No TX: Check for proper T9 voltage at X56-1190-11.
  4. No TX: Collector voltage SB at X45-1080-00. Check Q9 2SA496Y.
  5. No TX: Check D1 MI301.

Remember it is Illegal to transmit out of band. This Modification is for Informational purposes ONLY.
Doing such modifications on your radio may void any warranty and damage your equipment.
All mods found on this database are offered to me by other amateur radio hams or captured by Packet system. 
KB2LJJ  take no responsibility or liability for any damage done resulting from any modification.  

 I have been trying to help our ham radio with the radio modifications and have asked for any type of new radio mods.
 However, I haven't received too many.  If all of you contributed a little more,  I believe I would be able to help 
all the other ham's that are looking for these mods. I know it is possible to get more mods from all the Ham's because of
 the wide range that exist throughout the world.  By doing this we can  flourish and enjoy more of this hobby that 
we've taken part in for so many years. Furthermore, I ask you not to forget to send me any modifications that you might
 have through email.  I would really appreciate it.

      Email                webmaster@kb2ljj.com

 73's
   John Ribeiro
             KB2LJJ