Heathkit Service Bulletins: HO-XXX SERIES (Complete 1966-89)
Joseph W Lutz
joelutz at JUNO.COM
Thu Apr 9 10:50:42 EDT 1998
Janaury 13, 1975
HO-10 Bulletin No::
Monitor Scope HO-10-1
"Hot"
Chassis"
Some transformers [PN 54-130] have been found to break down after about
five hours of use. The the primary shorts to the high voltage secondary,
raising the chassis approximately 1000V above the line voltage.
If a new power transformer has been installed, be sure to let the unit
operate for a while before returning it to the customer.
The vendor has been notified, and corrections will be made in replacement
stock
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October 21, 1980
HO-10 Bulletin No:
Monitor Scope HO-10-2
Replacing the Power Transformer
+ + + + Information not yet available + + + +
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December 9, 1981
HO-10 Bulletin No:
Monitor Scope HO-10-3
Replacing the Power Transformer
(Supercedes SB HO-10-2}
+ + + + Information not yet available + + + +
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June 24, 1988
HO-10 Bulletin No:
Monitor Scope HO-10-4
0.15 uf, 1.6 kV Capacitor [PN 23-94] NLA
The .15 uf, 1.6 kV capacitor [PN 23-94] at C30 and C31 are no longer
available from Heath Parts Replacement. A .1 uf, 1.6 kV capacitor [PN
23-62] and a 0.047 uf, 1.6 kV capacitor [PN 23-91] is used as a
substitute. Connect these two capacitors in parallel with the banded
ends in the same direction.
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October 21, 1980
HO-13 Bulletin No:
Panadapter HO-13-1
Replacing the Power Transformer
+ + + + Information not yet available + + + +
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June 24, 1988
HO-13 Bulletin No:
Panadapter HO-13-2
0.15 uf, 1.6 kV Capacitor [PN 23-94] NLA
The .15 uf, 1.6 kV capacitor [PN 23-94] at C30 and C31 are no longer
available from Heath Parts Replacement. A .1 uf, 1.6 kV capacitor [PN
23-62] and a 0.047 uf, 1.6 kV capacitor [PN 23-91] is used as a
substitute. Connect these two capacitors in parallel with the banded
ends in the same direction.
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October 18, 1985
HO-5404 Bulletin
No:
Station Monitor Scope HO-5404-1
Low Intensity
Low intensity can be caused by arcing between the body of R16, 470 kilohm
resistor [PN 6-474-1], and front panel chassis. On each unit received
for service, position the body of R16 at least 1/16" away from the
chassis and controls.
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January 16, 1987
HO-5404 Bulletin
No:
Station Monitor HO-5404-2
CRT Mounting Spacers Change
To complete a production run of HO-5404 kits, the two 6-32 x 1-3/4" round
spacers [PN 255-708] used to mount the CRT were replaced with four 6-32 x
7/8" hex spacers [PN 255-724] and two 6-32 x 3/4" setscrews [PN
250-1158]. Two of the hex spacers are joined together with the setscrew
to make the 1-3/4" spacer needed. Manual insert [PN 591-5100] tells the
customer how to install these spacers.
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March 31, 1988
HO-5404 Bulletin
No:
Station Monitor HO-5404-3
Q101, Q102, Q115 and Q116 Basing Screened Wrong On
[PN 85-2978-2] Main Board
On the [PN 85-2978-2] main board, the screed showing the drain and source
positions at Q101, Q102, Q115 and Q116 are interchanged. The correct
basing is shown in the drawing:
[[Picture a semi-circle, with the top of the semi-circle 'D', the bottom
'G' and mid-way in the arc, 'S' ]].
The [PN 85-2978-3] main boards are screened correctly atthese FET
locations.
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That is all I show listed for the HO-XXX series (1966-89). Enjoy!
73 de Joe W7LPF/4 [NNN0KUU]
QWCA - SOWP - NCVA - FISTS - RCC
Gordonsville, Va 22942 [Orange Co]
September 20, 1985
HOA-5404 Bulletin
No:
Pan Adaptor Module
HOA-5404-1-1
Not Recommended For Use With HW-9 and HW-99 Transceivers
The HOA-5404-1 Pan Adaptor Module isnot compatible with the Heath HW-9
and HW-99 transceivers. When connected to these transceivers, the sweep
from the HO-5404 Station Monitor could be heard in the receiver audio.
The sweep noise was heard on all bands. Engineering considers the noise
levels objectionable and does not recommend the Pan Adaptor Module be
used with these two transceivers.
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