Adjustment Points for many 'newer' Galaxy Radios...

 

DX11B

  1. VR 1....AM/FM S-Meter
  2. VR 2....SSB/CW S-Meter
  3. VR 3....SSB Squelch Range
  4. VR 4....AM/FM Squelch Range
  5. VR 5.....FM Deviation
  6. VR 7....SSB Carrier Balance
  7. VR 8....RF Meter
  8. VR10...Final Bias
  9. VR11...Driver Bias
  10. VR12...SSB ALC
  11. VR13...AM/FM High Power
  12. VR14...AM Modulation
  13. VR16...CW Tone Level
  14. VR20...Final Bias
  15. VR21...TX Offset
  16. VR601..13.8 Volt Power Supply
  17. VR803..AM/FM Low Power

DX22B
  1. VR 1....AM/FM S-Meter
  2. VR 2....SSB S-Meter
  3. VR 3....SSB Squelch Range
  4. VR 4....AM/FM Squelch Range
  5. VR 7....SSB Carrier Balance
  6. VR 8....RF Meter
  7. VR11...Driver Bias
  8. VR12...SSB ALC
  9. VR13...High Power
  10. VR14...AMC
  11. VR15...AM Low Power
  12. VR16...SSB Low Power
  13. VR21...TX Offset
  14. VC 1....10.240
  15. VC 2....10.240

DX2517
  1. VR 1....AM/FM S-Meter
  2. VR 2....SSB S-Meter
  3. VR 3....SSB Squelch Range
  4. VR 4....AM/FM Squelch Range
  5. VR 5....FM Deviation
  6. VR 6....SSB Carrier Balance
  7. VR 7....TX Offset
  8. VR 8....CW Beep Level
  9. VR 9....RF Meter
  10. VR10...Final Bias
  11. VR11...Final Bias
  12. VR12...Driver Bias
  13. VR13...SSB ALC
  14. VR14...AM/FM High Power
  15. VR15...AM Modulation Meter
  16. VR16...AM Modulation
  17. VR17...SSB Power
  18. VR18...AM/FM Low Power
  19. VR601..13.8 Volt Power Supply

DX2527
  1. VR 1....AM/FM S-Meter
  2. VR 2....SSB S-Meter
  3. VR 3....SSB Squelch Range
  4. VR 4....AM/FM Squelch Range
  5. VR 7....SSB Carrier Balance
  6. VR 8....RF Meter
  7. VR11...Driver Bias
  8. VR12...SSB ALC
  9. VR13...High Power
  10. VR14...AMC
  11. VR15...AM Low Power
  12. VR16...SSB Low Power
  13. VC 1....10.240
  14. VC 2....10.240

DX2547

AM High Power VR14
AM Low Power VR18
SSB APC VR17
SSB ALC VR13
AM Modulation VR16

 

DX33HML, DX44V, DX55V, DX66V, and DX73V

  1. VR 1....AM/FM S-Meter
  2. VR 4....AM/FM Squelch Range
  3. VR 5.....FM Deviation
  4. VR 8....RF Meter
  5. VR12...Low Power AM Modulation
  6. VR13...AM/FM High Power
  7. VR14...High Power AM Modulation
  8. VR16...AM/FM Low Power
  9. Unmarked VR in R188..AM/FM Medium Power (DX 33HML only)
  10. Unmarked VR in C139..Med Power AM modulation (DX 33HML only)

DX77HML, DX88HL, and DX99V

  1. VR 1....AM/FM S-Meter
  2. VR 2....SSB S-Meter
  3. VR 3....SSB Squelch Range
  4. VR 4....AM/FM Squelch Range
  5. VR 5.....FM Deviation
  6. VR 7....SSB Carrier Balance
  7. VR 8....RF Meter
  8. VR10...Final Bias
  9. VR11...Driver Bias
  10. VR12...SSB ALC
  11. VR13...AM/FM High Power
  12. VR14...AM Modulation
  13. VR16...AM/FM Low Power
  14. VR20...Final Bias
  15. VR21...TX Offset
  16. Unmarked VR in R189..AM/FM Medium Power for DX 77HML only

DX949 and DX959

  1. VR 1....AM S-Meter
  2. VR 2....SSB S-Meter
  3. VR 3....SSB Squelch Range
  4. VR 4....AM Squelch Range
  5. VR 6.....SSB Carrier Balance
  6. VR 7....TX Offset
  7. VR 9....RF Meter
  8. VR10...Final Bias
  9. VR12...Driver Bias
  10. VR13...SSB ALC
  11. VR14...AM High Power
  12. VR15...AM Modulation Meter
  13. VR16...AM Modulation
  14. VR17...SSB Power
  15. VR18...AM Low Power
  16. VC1....10.240

Roger Beep Mods:

The tone and time of the roger beep on the 10 Meter mobiles can be changed as follows:

Disabling Talkback:

DX 949 and DX 959 SWR ALERT:
  • SYMPTOM:
    • SWR ALERT LED stays on when SWR is below 3:1
  • PROBLEM:
    • Q1 on SWR PC board is too sensitive
  • SOLUTION:
    • Replace C5 with a 22K ohm 1/4 watt resistor

10 Meter Mobile Radios with Excessive Noise on Receive and Low Receiver Sensitivity:

  •  SYMPTOM:
    • Excessive noise on receive and low receiver sensitivity
  •  PROBLEM:
    • High noise level at TR17
  •  SOLUTION:
    • Resolder C49 flush to circuit board

DX 2517 SSB DISTORTION:
  • SYMPTOM:
    • Excessive SSB receiver distortion
  • PROBLEM:
    • Unstable VCO drive signal at IC2 pin 5
  • SOLUTION:
    • Replace R121 with a 5.6K ohm 1/8 watt resistor
DX 2517 and DX 2527 "Buzzing / Motorboating:"
  • SYMPTOM:
    • Buzzing or motorboating sound in either the transmit or receive
  • PROBLEM:
    • TR602 is oscillating
  • SOLUTION:
    1. Replace C602 with a .01uF cap
    2. Remove C608
DX 73V RF Power Meter Adjustment:
  • SYMPTOM:
    • RF Power Meter does not adjust properly
  • PROBLEM:
    • VR8 does not have enough range
  • SOLUTION:
    • VR8 should be a 100K potentiometer. Some radios were mistakenly built using a 10K instead of a 100K potentiometer. Replace the 10K pot with a 100K pot.
DX 2517 Talkback Squeal:
  • SYMPTOM: 
    • Talkback squeals when mic gain is at max 
  • PROBLEM: 
    • Excessive drive to IC-8 pin 4 
  • SOLUTION: 
    • Replace R-221 with a 200K ohm resistor

Wiring Instructions for Galaxy Echo-only Boards:

  1. Solder brown wire on white connector labeled J4 to an 8 volt source
  2. Solder black wire on white connector labeled J4 to DC ground
  3. On radio mic jack locate and remove audio input wire to main pc board
  4. Solder white wire from J2 to audio input pin on mic jack
  5. Solder black wire from J2 to ground pin on mic jack
  6. Solder white wire from J1 to main pc board where audio input wire was
  7. Solder black wire from J1 to main pc board ground
  8. Mount attached dual potentiometer to desired location
Using Road King 56 with DX 73V:
  • Symptom:
    • Loss of Talk Back when using Road King 56 microphone
  • Cure:
    • Talk Back can be restored by adding a 470k ohm resistor from junction of C155/R207 to the junction of C187/R235 on the solder side of the board. This will also give you clean talkback on SSB and FM. Try different values of resistance to get the amount of volume you want. The less the resistance the louder the talkback will be.

Alignment for the DX 88HL Frequency Counter (EPT210010) (This is the older/larger model)

  1. Set band button to high
  2. Set band switch to "A"
  3. Set mode switch to "AM"
  4. Set clarifier fine/coarse to 12 o'clock
  5. Set channel selector to 1
  6. Connect oscope to C618
  7. Adjust T601 for peak
  8. Connect frequency counter to IC 608 pin 9
  9. Adjust VC603 for 3.27675
  10. Connect frequency counter to IC 607 pin 1
  11. Set mode switch to "USB"
  12. Adjust T602 for 2.67310
  13. Set mode switch to "AM"
  14. Adjust VC602 for 2.67375
  15. Set mode switch to "LSB"
  16. Adjust VC601 for 2.67435
  17. Set mode switch to "USB"
  18. Re-adjust T602 for 2.67315
  19. Repeat steps 13 through 18 until all frequencies are correct
DX 2517 (EARLY) Technical Update

(Effects radios shipped only in about the first two months of production.)

  •  SYMPTOM -- Receive audio goes off when the Noise Filter and Roger Beep are both switched on.
  •  PROBLEM -- 8 volts for the Noise Filter board is provided by the switching board (EPT0SSB80A). The 8 volts should come from a constant source but instead is switched on and off by the Roger Beep.
  •  SOLUTION -- Our technician has come up with an easy way to correct this problem. Cut the red wire next to CN13 located on the switching board. (See picture labeled "INCORRECT") Strip and solder this wire to resistor R90 which is located on the corner of the main board closest to the switching board. The lead closest to the switching board is a constant 8 volt source. (See picture labeled "CORRECT")

DX 2517 External Jack Wiring Problem:
  • SYMPTOM:
    • Plugging an external speaker into the EXT. SP. jack on the back of the radio causes the PHONE jack on the front panel to stop working.
  • PROBLEM:
    • The external speaker jack and the front panel phone jack may be wired backwards in some DX 2517 radios.
  • SOLUTION:
      Performing steps 1 through 8 will fix this problem and step 9 is for fixing the problem of receiver audio coming through the PA jack on the back of the radio when the mode switch is not in PA mode.  
      1. Remove covers from radio
      2. Unsolder pink wire on the phone jack that comes from the internal speaker.
      3. Unsolder orange wire from main PCB that comes from external speaker PCB marked SP2.
      4. Unsolder yellow wire from the external speaker PCB marked SP3.
      5. Solder this yellow wire to the main PCB where the orange wire in step 3 was.
      6. Unsolder orange wire from SP2 and discard.
      7. Solder new wire from SP2 on external speaker PCB to where pink wire on Phone jack was.
      8. Solder new wire from SP3 on external speaker PCB to pink wire of the internal speaker.
      9. Unsolder buss wire in C245 and replace with a 102 or .001uf ceramic cap.

 

Radio Potentiometer Reference Chart

 

 

33

44

55

66

73

77

88

99

VOL/SQ

A

A

B

B

 

A

A

B

MIC/RF

C

C

D

D

 

C

D

D

DIM/PO

~

~

E

E

 

~

~

E

ECHO

F

~

~

~

 

~

~

~

DUAL ECHO

~

A

~

B

 

B

A

~

ECHO/VC-ECHO

~

~

~

~

 

~

~

B

CLARIFIER

~

~

G

G

 

~

~

~

FINE/COARSE

~

~

~

~

 

H

H

I

POWER

~

J

~

~

 

~

~

~
 

Accessory Echo Boards and Echo/VC/Robot Boards use POT-A

Part Number

Description

Knobs Used

POT-A

50KA/50KB/SW (large)

1 and 2

POT-B

50KA/50KB/SW (small)

1 and 2

POT-C

1KB/1KA (large)

1 and 2

POT-D

1KB/1KA (small)

1 and 2

POT-E

1KB/1KA/SW

1 and 2

POT-F

50KB

3

POT-G

20KB

3

POT-H

20KB/1KB (large)

1 and 2

POT-I

20KB/1KB (small)

1 and 2

POT-J

1KA

3

KN-1

small flat (requires spring 1)

 

KN-2

round outer (requires spring 2)

 

KN-3

medium flat (no spring required)

 

KN-SPACER

plastic spacer for knobs

  

 

 A NOTE ABOUT POT VALUES:

  • The first number is the value of the rear pot, controlled by the inner shaft.
  • The second number is the value of the front pot, controlled by the outer shaft.
  • On switched pots, the switch is part of the rear pot and is controlled by the inner shaft.
  • The letter "A" means that the pot is tapered.
  • The letter "B" means that the pot is linear.

    FOR EXAMPLE:

      25KA/10KB/SW means that --
      • the rear pot is 25,000 ohms and is tapered,
      • the front pot is 10,000 ohms and is linear, and
      • the rear pot is switched
DX 77HML
  • SYMPTOM:
    • Excessive noise on transmit with mic gain off
  • PROBLEM:
    • DC voltage is leaking into the audio through C128
  • SOLUTION:
    • Replace C128
FC 347
  • SYMPTOM:
    • External frequency counter is erratic and unstable 
  • PROBLEM: 
    • L22 is out of alignment 
  • SOLUTION: 
    1. Remove bottom (speaker) cover of radio 
    2. Set channel selector to 1 
    3. Set band knob to D on 6 band models and E on 8 band models 
    4. Set band switch to HI (if applicable) 
    5. Connect scope to bare lead of L50 (located next to IC10) 
    6. Adjust L22 (inside radio) for maximum signal on scope.