Heathkit Service Bulletins - HW-104 (Complete)

[Joseph W Lutz]

                        December 4, 1975
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-1

                        Receiver Inoperative

Check for and remove the shorting wire at FET's Q701 and Q704.  These
part number 417-274 FET's are now being shipped with a shorting wire on
the leads.
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                        January 29, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-2

                       Low Sensitivity and Spurious Products

Complaints of low sensitivity and/or spurious products may be due to Part
No. 56-56 diodes being supplied in the kit instead of the PN 56-24.  The
PN 56-24 diode is Blue, and may have "56-24" stamped on the diode body.
The PN 56-56 is Orange-Red and usuall has "1N4149" stamped on the diode
body, or a small "H'.

A quick inspection of the receiver front-end board can determine if
incorrect diodes were supplied in the kit; all the diodes on the board
should be Blue {PN 56-24}.

This problem may occur in other kits, and should be watched for.
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                        February 23, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-3

                                         AC Hum with AF Gain at Minimum

See Bulletin No. SB-104-23 dated February 23, 1976.
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                        February 23, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-4

        Harmonics & Spurious Radiations Near The Output Signal

See Bulletin No.  SB-104-22 dated February 23, 1976.
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                        February 25, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-5

                Suprious Radiation on 40 and 20 Meters

See Bulletin No.  SB-104-24 dated February 25, 1976.
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                        March 2, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-6

                      Power Drop-Off on 20 Meters

See Bulletin No. SB-104-25 dated March 2, 1976.
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                        March 16, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-7

        Harmonics & Spurious Radiations Near The Output Signal

See Bulletin No.  SB-104-26 dated March 9, 1976.
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                        March 16, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-8

                        High Level 3395 KHZ Spur on 80 Meters

See Bulletin No. SB-104-27 dated March 9, 1976.
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                        March 16, 1976
HW-104                                          Bulletin No:
Solid State Transceiver                         HW-104-9

                Skewed Receiver Response on 80 Meters

See Bulletin No.  SB-104-28 dated March 9, 1976.
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**********ATTENTION******************ATTENTION*****************ATTENTION*********

After 3/16/76 all bulletins which are applicable to both the SB-104 and
the HW-104 will be listed only in the SB-104 Bulletin Section.  The model
number at the upper left corner will be written as SB/HW-104 when the
Bulletin applies to both models.  Bulletins that apply only to the HW-104
will be in this section.

Because of the similarity of circuits used in the HW-104 and SB-104, you
should refer to previously issued bulletins on the Sb-104 when servicing
the HW-104.  Many of the service hints and modifications listed are
applicable to the HW-104.
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That's it for the HW-104 [There is HW-104-10, but it was issued in 1977 -
sorry,
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73 de JOE- - - - - - - - - - -W7LPF/4 (NNN0KUU)- - - - - - - - - - - - -
- -QWCA - NCVA - SOWP - FISTSGordonsville, Va 22942 (Orange
County)Looking for:  Heathkit HR/HX-20, MR/MT-1,
Central Electronics 100V or 200V- - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - -