E. F. Johnson Factory Service Bulletins
Documentation Project

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I am looking for other E.F. Johnson CB Service Bulletins.
Number Date Models Affected Reason
5-26-69
Messenger 123 Receiver Inoperative
6-25-69
Messenger 320, 323 Audio Output Transformers
4-25-72
Messenger 123, 123A On-Off Switch Damage
6-30-72
Messenger 109 Capacitors Incorrectly Installed
6-27-72
Messenger 122, 123, 123A, 223 Part Number Change
1-10-73
Messenger 122, 123A Receiver Oscillation
1-10-73
Rechargeable Battery Unit Possible shorting of circuitry
3-29-73
Messenger 109 Antenna Breakage
3-30-73
Johnson Duo-Scan Receiver Locking on low band
3-14-73
Messenger 323 Squelch Operation
5-7-73
Messenger 122 Wrong Resistor Installed
8-2-73
Johnson Duo-Scan Receivers Defective pilot lamp
9-11-73
See Doc For Models Transistor Substitution
10-24-73
Messenger 123A Positive Ground
5-20-74
Messenger 130 Squeal When Transmitting
6-3-74
Messenger 250 Tone Quality
8-5-74
Johnson Transceiver Tester Measure Mod. in mobile install
8-12-74
Messenger 125 Self-modulation with Power Supply
2-11-75
Messenger 124, 124M, 320, 323 Self-modulation
5-7-75
Johnson VHF Mini-Scan Audio Distortion
7-2-75
Messenger 123A, 123B, 123SJ, 130 High Frequency Osc Dropout
7-2-75
Messenger 123A, 123B, 123SJ, 130, 132, 250 Audio Distortion
3-20-73
All Models Sweep Alignment
n/a
Messenger 109 Test Procedure
n/a
Messenger 123A Test Procedure
n/a
Messenger 125 Test Procedure
n/a
Messenger 124M Test Procedure

 



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