Heathkit Service Bulletins - SB-102 (Complete)

Joseph W Lutz joelutz at JUNO.COM
Wed Aug 13 18:20:44 EDT 1997


                November 25, 1970
SB-102                                          Bulletin No.
SSB Transceiver                                 SB-102-1

                                          Meter Zeroing

SEE BULLETIN NO. SB-101-1 DATED NOVEMBER 25, 1970

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                        September 14, 1972
SB-102                                          Bulletin No.
SSB Transceiver                                 SB-102-2

                       Repeated Heterdodyne Oscillator Tube
                                                  Failure

SEE BULLETIN NO. SB-101-2 DATED SEPTEMBER 14, 1972

--------------------------------------------------------------------------------------------------------------------
                        March 23, 1973
SB-102                                          Bulletin No.
SSB Transceiver                                 SB-102-3

                           Low Grid Drive - Alignment Problems

This has been related to the differences [internal electrode capacitance]
between Tung-Sol & RCA 6146's.  Purchasing has ceased buying Tung-Sol
tubes; all new stock since late 1972 will be RCA's which give better
performance.  In addition, an additional alignment sequence is being put
into the manuals which insures adequate gride drive -- previous tune-up
was done in receive only where the peaks were broader than required for
transmitter tuning.  The new procedure uses the receiver sequence to get
in the "ball park"; the added sequence peaks for maximum grid drive.

The following modifications to the manual will helpavoid the many
questions:

PAGE 103:  8th step, right column, last two sentances:

 Then turn the meter switch to GRID [grid current].  The meter should
have some up-scale indication.  The meter may read as much as full scale
-- this is normal.

PAGE 104: left column #2:

Turn the meter switch to GRID & adjust the MIC/CW LEVEL control for a
grid current reading, just enough so a peak may be seen when making the
adjustment in the next step.

PAGE 104:  Right Column #4 - will be deleted.

PAGE 119:  Right Column #14 - will be deleted.

----------------------------------------------------------------------------------------------------------------
                        March 30, 1973
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-4

                        LMO Instability

We have a possible cure for some of the LMO instability problems in the
SB-102.  The following should help eliminate any stress on the LMO
chassis when installed on the main chassis.

Remove and discard the lockwashers & nuts used to mount the LMO to the
chassis.

Use instead a #6 flat washer [253-25] & hex lock not [252-27] at each
lug, tightening each lug A TURN AT A TIME in a criss-cross pattern.

We recommend this be done on all SB-102 units in for service even if
customer has no complaints about LMO.
----------------------------------------------------------------------------------------------------------------
                        October 29,1973
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-5

                              Low 40 Meter Output

1.  REMOVE the 1-1/2" bare wire from hole 1 on the DRIVER PLATE circuit
board & the ground foil of the RF DRIVER board.

2.  Connect a 3/4" bare wire between the ground foils of these same two
boards.

3.  REMOVE the 1-3/4" bare wire from hole 1 in the DRIVE GRID circuit
board & the ground foil of the RF DRIVER board.

4.  Connect a 3/4" bare wire between the ground foils of these same two
boards.

5.  Remove the 2-3/4" bare wire which ties the groundfoils of the circuit
boards to the shields.

6.  Remove the coil cover.  Then REMOVE rour of the light spring clips &
their hardware as shown:

[[[NOTE:  the pictorial shows removal of the set of clips & hardward
located directly down from the 2 holes in the cover; the other set to be
removed is directly across and down from the 3 holes in the cover.]]]

7.  Readjust the driver grid & drive plate coils as instructed on page
102 in the SB-102 manual.
------------------------------------------------------------------------------------------------------------------
                        May 23, 1974
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-6

                           SB & HW Series Audio Preamplifier & Vox
Circuit
                           Trouble Shooting Guide.

SEE BULLETIN NO: SB-100-3 DTD MAY 23, 1974.
-----------------------------------------------------------------------------------------------------------------
                        May 23, 1974
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-7

               SB & HW Series Instability & Corrective Information.

SEE BULLETIN NO: SB-100-4 DTD MAY 23, 1974.
-------------------------------------------------------------------------------------------------------------------
                        May 23, 1974
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-8

             Alternate Method of Neutralizing The Final Amplifiers

SEE BULLETIN NO: SB-100-2 DTD MAY 23, 1974.
-----------------------------------------------------------------------------------------------------------------
                        December 18, 1974
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-9

                                         Oscillations or Low Drive

SEE BULLETIN NO: SB-100-5 DTD DECEMBER 8, 1974
----------------------------------------------------------------------------------------------------------------
                        May 2, 1975
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-10

                              Self Oscillations Occuring

SEE BULLETIN NO: SB-100-6 DTD MAY 2, 1975
--------------------------------------------------------------------------------------------------------------
                        June 5, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-14

                 Relays Remain Energized After Transmit Condition

SEE BULLETIN NO. HW-100-9 DTD JUNE 5, 1978
---------------------------------------------------------------------------------------------------------------
                        June 5, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-15

                                Poor AGC Action

SEE BULLETIN NO: HW-101-24 DTD JUNE 5, 1978
----------------------------------------------------------------------------------------------------------------
                        June 5, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-16

                            100KHZ Calibrator Spurs

SEE BULLETIN NO: HW-101-25 DTD JUNE 5, 1978.
----------------------------------------------------------------------------------------------------------------
                        July 24, 1978

SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-17
                         Poor Preselector Tracking

SEE BULLETIN NO: HW-100-13 DTD JULY 24, 1978
------------------------------------------------------------------------------------------------------------------
                        July 24,  1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-18

                    Carrier Nulls with IC14 Trimmer Plates Completely
Meshed

SEE BULLETIN NO: HW-100-14 DTD JULY 24, 1978
-----------------------------------------------------------------------------------------------------------------
                        August 7, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-19

                                          Relays Chatter In VOX Mode

SEE BULLETIN NO: HW-100-15 DTD AUGUST 3, 1978
----------------------------------------------------------------------------------------------------------------
                        August 7, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-20

                   Loading Capacitor Turns As Plate Capacitor Is Rotated

SEE BULLETIN NO: HW-100-16 DTD AUGUST 3, 1978.
--------------------------------------------------------------------------------------------------------------
                        August 7, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-21

                "Chirping" & Slow Receiver Recovery

SEE BULLETIN NO: HW-101-32 DTD AUGUST 3, 1978
--------------------------------------------------------------------------------------------------------------
                        August 22, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                         SB-102-22
                        S Meter Drift

SEE BULLETIN NO: HW-100-17 DTD AUGUST 22, 1978.
------------------------------------------------------------------------------------------------------------
                        September 26, 1978
SB-102                                          Bulletin No:
SSB Transceiver                                 SB-102-23

                        Poor IF Sensitivity

SEE BULLETIN NO: HW-100-19 DTD SEPTEMBER 26, 1978.
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That's it for SB-102, covering Bulletins 1966-78 [less 1977 which I do
not have]
Enjoy.
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- - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - -




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