Heathkit SB-10 Series Troubleshooting Manual page 11

ah.1.82.HW-101-78: Tune Control Slips..............................................................................................................158
ah.1.83.HW-101-79: Driver Stage Oscillates on 15 Meters.................................................................................158
ah.1.84.HW-101-80: Low Transmitter Output Due to Low VFO Output..............................................................158
ah.1.85.HW-101-81: Preselector Capacitors Won't Take Solder........................................................................159
ah.1.86.HW-101-82: S Meter Drifts; IF Oscillates...............................................................................................159
ah.1.87.HW-101-83: Oscillation on 15 Meters.....................................................................................................159
ah.1.88.HW-101-84: R1, R6 and R7 Out of Tolerance or Open..........................................................................159
ah.1.89.HW-101-85: VOX Activates When Mike Not Connected........................................................................160
ah.2.SB-100 Service Bulletins............................................................................................161
ah.2.1.SB-100-1: Diode Leakage in The SB-100, SB-101, HW-100...................................................................161
ah.2.2.SB-100-2: Alternate Method of Neutralizing the Final Amplifiers.............................................................161
ah.2.3.SB-100-3: SB & HW Series Audio Preamplifier & VOX Circuit Trouble Shooting Guide.........................162
ah.2.4.SB-100-4: SB & HW Series Instability and Corrective Information...........................................................163
ah.2.5.SB-100-5: Oscillations or Low Drive.........................................................................................................165
ah.2.6.SB-100-6: Self Oscillations Occurring After Installation of Steel Comb Brackets.....................................165
ah.2.7.SB-100-7: S-Meter Drift............................................................................................................................ 165
ah.2.8.SB-100-8: Transmitter Oscillates in Transmit with the Mic Keyed............................................................165
ah.2.9.SB-100-9: Tuning Erratic.......................................................................................................................... 166
ah.2.10.SB-100-10: Relays Remain Energized After Transmit Condition...........................................................166
ah.3.SB-101 Service Bulletins............................................................................................167
ah.3.1.SB-101-1D: Driver Oscillates on 40 Meters..............................................................................................167
ah.3.2.SB-101-2D: Switch Action Improvement..................................................................................................167
ah.3.3.SB-101-3D: Improper Tuning................................................................................................................... 167
ah.3.4.SB-101-4D: Improper Tuning on 40Meters..............................................................................................167
ah.3.5.SB-101-5D: Grounding Problems on Transceivers..................................................................................168
ah.3.6.SB-101-1: Meter Zeroing.......................................................................................................................... 168
ah.3.7.SB-101-2: Repeated Heterodyne Oscillator Failure.................................................................................168
ah.3.8.SB-101-3: SB & HW Series Audio Amplifier & VOX Circuit Trouble Shooting Guide...............................169
ah.3.9.SB-101-4: Diode Leakage in the SB-100, SB-101, HW-101....................................................................170
ah.3.10.SB-101-5: SB & HW Series Instability & Corrective Information............................................................170
ah.3.11.SB-101-6: Alternate Method of Neutralizing the Final Amplifiers...........................................................172
ah.3.12.SB-101-7: Oscillations or Low Drive.......................................................................................................173
ah.3.13.SB-101-8: Self Oscillations Occurring After Installation of Steel Comb Brackets...................................173
ah.3.14.SB-101-9: S-Meter Drift.......................................................................................................................... 173
ah.3.15.SB-101-10: Low Receiver Sensitivity.....................................................................................................173
ah.3.16.SB-101-11: Transceiver Oscillates in Transmit with Mic Keyed.............................................................174
ah.3.17.SB-101-12: Tuning Erratic...................................................................................................................... 174
ah.3.18.SB-101-13: Relays Remain Energized After Transmit Condition...........................................................174
ah.4.SB-102 Service Bulletins............................................................................................175
ah.4.1.SB-102-1: Meter Zeroing.......................................................................................................................... 175
ah.4.2.SB-102-2: Repeated Heterodyne Oscillator Tube Failure........................................................................175
ah.4.3.SB-102-3: Low Grid Drive - Alignment Problems.....................................................................................175
HW & SB Series Manual Page 11