ah.1.78. HW-101-74: Keys Continuously When Used With the SA-5010 Memory
Keyer
JANUARY 21, 1982
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-74
This may be caused by a defective 6EA8 tube [PN 411-124] at V15. To check for a
defective tube, increase the volume to maximum on the HW-101, switch to CW mode,
and listen for a 1-kilohertz tone. If a tone is heard, replace V15.
ah.1.79. HW-101-75: R940 Overheats
MARCH 11, 1982
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-75
If the 100-ohm resistor [PN 6-101] at R940 overheats, change:
- C701 and C801 from 680 pF 300 volt to 680 pF 500 volt [PN 20-735].
Install the higher voltage rated capacitor on all units received for service.
ah.1.80. HW-101-76: Carrier Null Control Installation Change
FEBRUARY 25, 1982
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-76
The case of the 200-ohm carrier null control [PN 10-147] has been changed to an
aluminum case. Therefore, you cannot solder a wire to the case as was done on the
older type control. If you attempt to solder a wire to the case, the heat will damage the
plastic parts inside the control. So, when replacing a carrier null control with the new
type, use the following procedure:
Melt a small amount of solder onto the two mounting tabs of the 200 ohm control [PN
10-147].
Now place a fiber washer on the shaft of the control and install it from the foil side of the
board. Solder the five tabs to the foil.
ah.1.81. HW-101-77: VFO Stops Oscillating at High End of Dial
APRIL 23, 1982
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-77
Two peaks will be noticed when adjusting the VFO coil, one near the top of the coil and
the other near the bottom of the coil. Adjust the VFO coil to the top peak to correct this
problem. However, to do this it may be necessary to adjust the slugs in T941 to reduce
the output level. Reduce the output level from 3-volt RF to about 2-volt RF.
HW-101 Service Bulletins Page 157
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