Heathkit HM 2103 Manual

Page 2

Assembly
and
Operation
of the

_HEATI-IKIT

RF LOAD
WATTMETER

MODEL HM-2103

HEATH COMPANY

BENTON HARBOR MICHIGAN 49022

L.- TAB LE OF CONTENTS
lntroductionf. . . i ..... - ..... T 2
Parts List ..................... 2
Step-by-Step Assembly

Circuit Board Assembly ........... 3

Cabinet Assembly .............. 6

Cabinet Wiring ............... 7
Calibration .................... 16
Final Assembly .................. l- 18
Operation .................... 19
In Case of Difficulty

+ Troubleshooting Chart ............ 20
Factory Repair Service .............. 21
Specifications .................. 22

' Circuit Description ................ 23

I Schematic .................... 23
Circuit Board X-Ray View ............. 24
Cabinet Photograph ................ 24

Page 9

Page 8

HEATHKITE

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VERY_THIN WIRES, l-EFMIWI llli IMEP, INSHIAIIIIIJ

S E DIMENSIONS
ABOVI.

PUSH BACK THE SHIELD THFN MAKE AN OPENING IN
THE SHIEID AND BIND OVER AS SHOWN PICK Olll
THI INNER LEADS

RIMOVL I'HI INNER INSULATION AND SIREICH OUI
IllE SHIILD. APPLY A SMALL AMOUNT OF SOIDER T0
THI END OI: THE SHIFLD AND IIIF INNER LIADS USE
ONLY ENOUGH I-IEAI FOR IHF SOIDER TO FLOW.

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Detail 4A

NOTE: In the next two steps, leave the lamp leads as long as
possible.

I I Connect the lowest lamp lead to lug 2 of terminal strip
E INS).

I ) Connect the other lamp lead to lug 1 of terminal strip
E (82).

I I Locate the battery connector and connect the black
lead to lug 2 of terminal strip E (8-2).

I I Turn terminal strip E to press the lamp as far into the

lens as possible. Then tighten the hardware. Be sure
the lamp leads are not touching.

3A%% 0 1" 2n

*

I I

Connect the red battery connector lead to mg 1 0f
switch B (8-2).

Prepare both ends of the 21" lengths of cable as
shown in Detail 4A.

Connect the wires from the 2" end of the prepared cable to
switch 8 in the following steps.

I I
I l
I l

Red to lug 7 (5-1).
White to lug 5 (8-1).

Black to lug 3 (5-1 I-

NOTE: In the next step, do not overtighten the meter nuts
as the meter case can be broken. Also, make sure the meter
top is parallel with the top of the panel.

I I

Remove the meter and meter hardware from its
carton. Mount the meter at H with the meter
hardware. See Detail 4B. The shorting wire will be
removed later.

Connect the red wire coming from lug 4 of switch B to
the positive (+) lug of meter H (8-1 I.

Connect the black wire coming from solder lug P to
the negative (unmarked) lug of meter H (NS).

Connect a 3-1/ " black wire to the negative lug of
meter H (8-2). The other end will be connected later.

NOTE: The 2 white wire will be used later.

INSIDE OF
FROKI FAN

METER
HARDWARE
Detail 4B
3" 4 5H 6H

LI-Ld-l-+-|-I_.I_I__i___l_i_l__.__L__|_|