HEATHKIT SERVICE BULLETINS - CONT
Joseph W Lutz
joelutz at JUNO.COM
Thu Jun 19 09:41:33 EDT 1997
Continuing with the SB-102:
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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.
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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.
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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.
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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.
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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.
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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
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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
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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
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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
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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.
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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
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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
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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
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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.
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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
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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.
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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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Okay, that's all I have on the SB-102. Sorry, but never received fiche
for 1977, so there will be blanks.
73 de JOE
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QWCA - NCVA - SOWP - FISTS
Gordonsville, Va 22942 (Orange County)
Looking for: Heathkit HR/HX-20, MR/MT-1,
Collins 516F-2, 312B-4, EFJ TR Switch
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