HEATHKIT SB-104 MANUAL PDF

This is Heathkit's one and only kitted solid state sideband transceiver. Except for one very short lived disastrous experiment, the later transceivers were fully assembled from a well known manufacturer and badged as Heath. I love this rig for its simplicity and straightforward design. I used mine for years, with no bad incident.

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Circuit Board Schematic Index. Inside front cover Pin-out Diagrams. The - V F O A f h e could cause a short circuit. Converter assemblies. The pushbuttons on switches S2 and S3 operate in m e If you do not get the expected results after you insert each following ways: circuit board, refer to the boxed "Possible Cause Chart" which follows.

If none of the difficulties listed is the cause 1. Push in t o latch. Release by pushing again and quickly of the malfunction, refer to the appropriate parts of the removing your finger. Example: the ON switch. Push i n to latch. Release by depressing another button in some cases, damage could result. A push-to-talk switch, as found on most microphones, is a 3. To release a depressed button in a group, gently push convenient way to key the transmitter in the following another bunon in the same group until the depressed steps.

I f your microphone cord is not already wired t o an button releases. Amphenol 80MC2M connector furnished ,you should refer t o Figure in the Installation Section of this Manual for the necessary wiring diagram. All other pushbuttons should be released Refer to Figure for front panel locations and to Figure out.

Make sure the keyway in the socket mates with the key on the plug. If you have difficulty in removing a circuit board, use screwdrivers in the board pullers as shown in Figure A. Connect the power supply t o the electric outlet. Display does not light. No voltage at switch S3, section C, pin 6. The meter should read 0 B. Voltage at "A" on display board too low or missing. Depress the PWR button.

The meter should read 0. Refer to the "Display Troubleshooting Chart". It will require a few seconds Page Pilot lamps do not light. I Power supply switch at OFF position. Power plug wired incorrectly. Power cable from power supply wired incorrectly. Defective power switch. Chassis wiring. In mobile installation, polarity of the power B. IC or IC Defective power supply.

Meter does not read Meter defective. Meter switch wiring incorrect. Chassis wiring incorrect. Shorting wire across meter terminals not 3. Supply voltage to Transceiver incorrect. WWV --? The pilot lamps should light and the display should read FFFF. The digit letter on the switch at 3. VOX does not operate. The last digit does not disappear. Switch defective. Switch wired incorrectly. Connect your microphone t o the MIC socket see E. The relay should click as it A, Depress the H I button.

Terminal H1 should measure. The voltage should be 0. Voltage a t H I is not. D l defective. Chassis wiring of the relay circuit. Q, or Q A On card A, use your ohmmeter t o check the resistance from the center conductor of J l O l t o the ground foil.

Page The display should read NOTE: The high frequency oscillator coils will be adjusted in the following steps. Refer to Figure for the method of Depress the CW The display should read inserting the alignment tool in the coil, and making a "flag" Then rotate the tool as shown in the HFO 1.

Incorrect counter readout. Time base not running. Diodes D l 0 7 through IC, IC IC, or IC Turn this control fully counterclockwise. Figure Connect the meter common lead to the chassis and connect the other lead to the free lead of the S2 vertical resistor marked TP near Q J Adjurt each HFO coil as described i n the following chart.

Before you adjust each coil for the peak voltage, turn it counterclockwise to 0 volts. Then rotate the Figure slug clockwise for the peak voltage, which will be typically 0.

BAN0 switch. In the following step, if the alignment tool will not 6. Refer to the HFOIpremix circuit board in the maintenance section. After the adjustment is completed, I reposition the VFO and tighten the mounting screws. Release the ON button. I 1 The object of this adjustment is to center the kHz 2. Turn the BAND switch to 3. Plug board D into compartment D. You may be able to see this display at two positions of the coil slug.

I Refer to Figure fold-out from Page and When you have the correct position, the display will engage the VFO adjustment control through hole FY read lower with counterclockwise rotation of the in the side of the VFO assembly.

Turn the control alignment tool. If the display is unstable. Figure 1 - 3. A Depress the LSB button. Do not turn display is the same as the US8 frequency you wrote the control beyond the point where the display down, and the same frequency is displayed when becomes stable.

The same frequency is not displayed in both LSB and following steps. Connector S No sound from speaker. Speaker connections. EDGE B. AF gain control connections. Detail D. ALCIfilter board into connector K. Position the switch wafers on the side away from the front panel. A Remove the phono plug from socket J l O l on circuit ' Plug c j m ,- board compartment.

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Heathkit Schematic and Manual Archive

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