ah.1.82. HW-101-78: Tune Control Slips
APRIL 29, 1983
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-78
To prevent the loading shaft from slipping when the tune control is adjusted, install two
nylon washers and a spring washer behind the loading shaft pulley onto the loading
shaft. Use the following installation procedure and illustration to install the washers.
Parts needed:
QTY DESCRIPTION PART NO.
2 flat nylon washer 253-49
1 spring washer 253-36
Procedure:
- Remove V6, V7, V10 and V11.
- Remove the loading shaft pulley.
- Install the spring washer [PN 253-36] between the two nylon washers [PN 253-
49] on the loading shaft.
- Reinstall the pulley by firmly pushing it onto the shaft and compressing the spring
washer between the nylon washers.
- Reinstall V6, V7, V10 and V11.
ah.1.83. HW-101-79: Driver Stage Oscillates on 15 Meters
SEPTEMBER 14, 1983
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-79
Bend the driver neutralizer wire exiting from hole “W” on the RF driver circuit board flat
against the circuit board as shown in the pictorial below. This will eliminate the
oscillation. Perform this on an “as needed” basis.
[[Pictorial shows neutralizer wire bent flat against PCB - down along side of C412.]]
ah.1.84. HW-101-80: Low Transmitter Output Due to Low VFO Output
SEPTEMBER 14, 1983
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-80
To check, measure the voltage at the emitter of Q942. The voltage should be about 8.6
VDC. If the voltage is significantly less (i.e. 7.5 VDC), replace Q942 with a hand-
selected [PN 417-118] transistor with the generic marking 2N3393 on it. This
replacement should increase the output by 0.1 VRF. Next, change R945 from a 4700
HW-101 Service Bulletins Page 158
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