E.
F. Johnson Factory Service Bulletins
Documentation Project
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| Number | Date | Models Affected | Reason |
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5-26-69
|
Messenger 123 | Receiver Inoperative | |
|
6-25-69
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Messenger 320, 323 | Audio Output Transformers | |
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4-25-72
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Messenger 123, 123A | On-Off Switch Damage | |
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6-30-72
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Messenger 109 | Capacitors Incorrectly Installed | |
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6-27-72
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Messenger 122, 123, 123A, 223 | Part Number Change | |
|
1-10-73
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Messenger 122, 123A | Receiver Oscillation | |
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1-10-73
|
Rechargeable Battery Unit | Possible shorting of circuitry | |
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3-29-73
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Messenger 109 | Antenna Breakage | |
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3-30-73
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Johnson Duo-Scan Receiver | Locking on low band | |
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3-14-73
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Messenger 323 | Squelch Operation | |
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5-7-73
|
Messenger 122 | Wrong Resistor Installed | |
|
8-2-73
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Johnson Duo-Scan Receivers | Defective pilot lamp | |
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9-11-73
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See Doc For Models | Transistor Substitution | |
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10-24-73
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Messenger 123A | Positive Ground | |
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5-20-74
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Messenger 130 | Squeal When Transmitting | |
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6-3-74
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Messenger 250 | Tone Quality | |
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8-5-74
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Johnson Transceiver Tester | Measure Mod. in mobile install | |
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8-12-74
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Messenger 125 | Self-modulation with Power Supply | |
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2-11-75
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Messenger 124, 124M, 320, 323 | Self-modulation | |
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5-7-75
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Johnson VHF Mini-Scan | Audio Distortion | |
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7-2-75
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Messenger 123A, 123B, 123SJ, 130 | High Frequency Osc Dropout | |
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7-2-75
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Messenger 123A, 123B, 123SJ, 130, 132, 250 | Audio Distortion | |
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3-20-73
|
All Models | Sweep Alignment | |
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n/a
|
Messenger 109 | Test Procedure | |
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n/a
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Messenger 123A | Test Procedure | |
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n/a
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Messenger 125 | Test Procedure | |
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n/a
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Messenger 124M | Test Procedure |
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Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.