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
--------------------------------------------------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------------------------------------
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- - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - -
More information about the Heath
mailing list