Heathkit Service Bulletins - HL-2200 (Revised & Complete)
Joseph W Lutz
joelutz at JUNO.COM
Sat Jan 31 00:07:25 EST 1998
April 6, 1984
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-1
Interfacing The Linear To Kenwood Exciters
The ALC voltage to Kenwood transceivers and transmitters should not
exceed -8 volts. To ensure the proper voltage to the Kenwood, add:
An 8 volt zener diode [PN 56-621] across the ALC connector on the
back
of the amplifier. Connect the banded end of the diode to the ground lug.
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April 26, 1985
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-2
T2 Overheats And Fails When Operating On 220 Volt
Line
When the linear amplifier is wired for 220 volt AC line operation, and
the contacts on SW2 [PN 61-45] or a high voltage transformer winding
opens, excessive current will flow through the primary of low voltage
transformer T2 [PN 54-238], causing it to fail. To prevent this failure,
the black-green lead and the black-yellow lead of T2 are lifted and
connected together with a wire nut.
To do this, refer to the drawing at the right and remove the black-green
lead at lug 3 of terminal strip AE (the lead from T2 at grommet AK) and
the black-yellow lead at lug 2 of SW2. Connect these wires together with
a wire nut [PN 432-199].
Make this wiring change on units you receive for service which are wired
for 220 volt AC operation. Let the customer know that this wiring change
has been made. If he wants to operate on 120 volts AC, he'll have to
reconnect these wires as shown in the assembly manual.
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October 25, 1985
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-3
PN 21-79 Capacitor At C7 Unavailable
The .001 uF, 6000 volt ceramic capacitor used at C7 is not available from
our vendors. Until an exact replacement capacitor is obtained from other
sources, two 5000 pF, 3000 volt ceramic capacitors [PN 21-116] will be
connected in series at C7. A bulletin will be issued to notify you when
the PN 21-79 capacitors are once again available.
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May 30, 1986
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-4
Power ON/OFF Switch Fails
Since the introduction of the HL-2200 Linear Amplifier, the failure rate
of the OFF/ON switch [PN 61-45] at SW1 has been high. This switch was ot
rated high enough to handle the surge current at turn on. The switch
needed for this application could not be supplied by our vendors. To
prevent switch failure, a modification was made to add a high-current
relay in the primary circuit and control the relay with the Power switch.
The Relay Modification Kit [PN 830-94] is available from Heath Parts
Replacement.
The Relay Modification Kits should be installed in all HL-2200s wired for
120 VAC operation. The Power switch rating is not exceeded when wired
for 220 VAC operation.
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May 30, 1986
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-5
Standby Switch Operates Backwards
When the Standby switch, SW5, is set to the "IN" position, the amplifier
should be on; in the "OUT" position, the amplifier is off. The Standby
switch currently used in the HL-2200 and stocked in Heath Parts
Replacement is a rocker switch; the original switch was a toggle switch.
In all HL-2200 Amplifiers using the rocker switch and wired according to
the manual, Standby switch SW5 operates backwards. To correct, move the
wire from lug 1 of SW5 to lug 5.
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December 23, 1986
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-6
L3 Mounting Clip Won't Fit Hole In Coil Shield Panel
The 80 meter input coil [PN 40-1012] at L3 now supplied by our vendor has
a coil clip that is too large in diameter to fit the mounting hold in the
coil shield panel. The coil clip on the new coil is .417" in diameter;
the old clip is .406" in diameter. This difference is less than 1/64 of
an inch. The .406" diameter clip is no longer being manufactured.
The new coil can be installed in either of two ways:
1) Remove the coil clip from the old coil being replaced and use this
clip to replace
the clip on the new coil. The old and new coils have the same
diameter coil
form.
2) If the old clip isn't available, enlarge the mounting hole in the
coil shield panel
about 1/64" larger in diameter.
When the new [PN 40-1012] coils are placed in Parts Replacement stock,
customers who order the new coil will also be sent an instruction sheet
[PN 597-4650] to tell them to use the clip from the old coil or to
enlarge the mounting hole.
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January 16, 1987
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-7
ICOM Antenna Relay Contacts Fails When Connected
To Antenna Relay Jack On Linear Amplifier
The 120 VDC at the Linear Amplifier antenna jack exceeds the 24 VDC
maximum rating of the antenna relay contacts in the ICOM transmitter.
This excess voltage causes the relay contacts in the ICOM transmitter to
weld together. To prevent this, conect the ICOM transmitter to the
Linear Amplifier using a 12 VDC relay
A relay box for this purpose is available from ICOM America, Inc.
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February 6, 1987
HL-2200 Bulletin No:
2KW Linear Amplifier HL-2200-8
Voltage Across Modification Relay Too High
When the PN 890-94 Relay Modification Kit is installed and the Linear
Amplifier is wired for 220 VAC operation, the voltage across the relay is
about 200 VAC; the relay is rated at 120 VAC. To reduce the AC voltage,
change:
Two 1500 ohm resistors to two 4700 ohm resistors [PN 3-21-7].
The two 4700 ohm resistors are connected in parallel for a total
resistance of 2350 ohms. Heath Parts Replacement stock of [PN 890-94]
Modification Kits are being reworked.
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Thats everything I hold up to 1989 that covers the HL-2200. Enjoy!
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73 de Joe W7LPF/4 [NNN0KUU]
QWCA - SOWP - NCVA - FISTS - RCC
Gordonsville, Va 22942 [Orange Co]
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