Heathkit IM 2410 Manual

Page 1

FREQUENCY
COUNTER
Model lM-241O

595-2383-10

- 544.._. A

Heathkif

Page 9

Page 7

-1_EEA:THKITA , I , _
KEY HEATH QTY. DESCRIPTION CIRCUIT KEY HEATH QTY. DESCRIPTION CIRCUIT
No. PanNo. Comp No. No. PanNo. Comp.No
CAPACITORS DIODES
Mica c1 sese 5 1114149 03, I4.

D7,D8
B1 2077 1 24 pF C15 D9
131 20.100 1 30 pF 012 C1 56-136 2 F0777 _ . D1, D2
B1 20490 1 51 DF 02 01 56-87 2 111$?ng Jfgyulglinze, D5, De,
'31 20102 1 1°° F C5 01 57-65 2 1N4002 013, 014
B1 20" 2 15° PF 021- 022 131 57-42 2 3A1 D11, D12
81 20-139 2 330 pF C7. 014
TRANSISTORS - INTEGRATED CIRCUITS
t
Ceramic (IC 8)
NOTE: Transistors and integrated circuits are marked for iden-
82 21-759 2 33pF 010,025 tification in one of the following ways:
32 21 -176 9 .01 F round 019, C23,
024,628, 1t Part number.
8:23; 2. Type number. (On integrated circuits this refers only
634, , to the numbers; the letters may be different or miss-
In.
Ba 21-717 8 .01 pF (108) square 03,68, 9)
09, C11, 3 Part number and type number
C13. 016. 4. Part number with a type number other than the one
617. 020 shown.
B4 21-70 1 .01 pFIarge romd 039
D1 417-293 5 2N5770 transistor 02, O4.
05. 06.
Tantalum 07
D1 417-292 1 2N5771 transistor 03
BS 25.220 2 10 il-F (10M) 018 011 D1 417-826 1 Selected transistor 01
85 25281 1 3 F . , . .
as 25282 1 6: FF :2 CAUTION: Any IC that is furnished With Its pins pressed Into a
foam pad can be damaged by static electricity. DO NOT re-
move it from the foam pad until you are instructed to do so in a
step.
Electrolytic
Dz 442-644 1 78L12 Ic U27
Be 25-917 2 IOILFGIBWOIVIC 035,037 De 442-54 1 7605 IC U26
B7 25-891 1 470 of 038 D4 443-750 1 5369 IC U10
53 25272 1 WOW 036 05 443.1 1 7400 IC W
05 443-941 1 7433 or 5433 IC U11
De 443-16 1 7476 IC U5
Other Capacitors 05 44334 1 749210 ua
D15 443-940 1 8647 IC U2
59 21-41 1 14pFresln(bm-yel-blk-grn) 027 6 4434594 3 9363 'C 31 U19«
310 29-64 1 .15proncalbonais c1 U20, U21,
811 31-67 1 7-25 pFirImmer C26 U22, U23..
U24.U25

*This part is critical to continued satatyt Replace only with a Heath
Company part.

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Page 17

NOTE: When you install a transistor or
integrated circuit [IC] in each of the
following steps, align its flat with the
flat on the board, Lnsert the leads into
their correct holesl Positi on the transis-
tor or lC 1/4 above the board Then
solder the leads to the foil and cut off
the excess lead lengths

Brut

T
1/4'

FLAT

IDENTIFICATION
ML DRAWING /

[ )QG: 2N5770 transistor (#417-
293),

( J U27: 731.12 3 (#4424544).

( )Q7; 2N577U transistor (#417-
293)

Perform the following steps in area B.

[ )Q's: 2N577o transistor (#417-
293),

( ]Q3: 2N577l transistor (#417-
292)

( JQ4: 2N5770 transistor (#417-
293]

( 1402: 2N5770 transismr (#417-
293],

[ )"Ql/FBI: Selected transistor
[#4174328]. Place a ferrite bead
on the gate (G) lead of this transis-
tor before you install it

FERRITE
BEAD

0 y. 1/2 A 1 menss) 2
us 3/8 5/: no

051194); a A s

PICTORIAL 1-7

The steps performed in this Pictorial are

/ V in this area of the circuit boards
1%

m-

Perform the following steps in area A.

( 1] C27: 725 pF trimmer Solder the
lugs to the foil.

( ) Install two fuse clips in the circuit
board as shown Position each
clip so its shoulders are away
from the other dip. Then solder
the clips to the foil

SHOULDER

( ) Locatethe clear tubing and cutoff .
a 1-1/2" lengths

( ] Flatten the tubing and cut each
end as shown.

I. CUT HALF WAY

THROUGH
\lfl
\$2.cur OPEN
\3I8 TO END

( ] FL Locate the 1/4»en1pere fuse
and insert it into the prepared tub»
ing. Then install the fuse into the
fuse clips.

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Page 36

OPERATIONAL TESTS

Refer to Pictorial 5-1 (Illustration Booklet, Page 5) for
the following steps,

WARNING: When the line cord is connected to an AC
outlet, line voltage is present at the DANGER areas of
the Frequency Counter. Be careful that you do not
touch these areas or an electrical shock will result.

Set the front panel switches as follows:
( ] SW1: POWER- OFF
( ) swz: GATE - 1 sec

[ ] SW3: FREQUENCY RANGE-10 Hz TO 50
MHz

NOTE: If you do not obtain the proper results in any of
the following steps, unplug the line cord and proceed
to the Initial Test Difficulties" chart on Page 43.

[ ). Plug the line cord into an AC outlet.
( ] Move the POWER switch to ON.

( ) The decimal points of displays V2. V3, and V4
should light.

[ ]' Move the POWER switch-to OFF and unplug
the line cord from the AC outlet.

Before you install an IC, first be sure the pins are
straight. Then lay it down on one of its rows of pins. as
shown below, in Part A, and roll the IC over until the
pins are at right angles or are bent in slightly as shown
in Part B. Repeat this process for the other row of pins.

@

CAUTION: When you install a protected IC. be sure it
does not get damaged by static elecn-icity. Once you
remove the foam pad from the IC, DO NOT let go of the
IC. Install the 1C as follows. Read the entire step before
you pick up the IC.

1. Pick up the IC and touch the foam pad with
both hands.

2. Hold the IC with one hand and remove the
foam pad with the other hand.

3. Continue to hold the IC with one hand and
straighten any bent pins with the other
hand.

4. Continue to hold the [C with one hand and
touch the foil side of the main circuit board
with the other hand.

5. Align the pin 1 end of the IC with the index
mark on the circuit board. See the inset
drawing on Pictorial 5-1.

6. Then push the IC pins into the IC socket.
Once in the socket, the 1C is protected. Sup-
port the circuit board from the foil side of
the circuit board as you install each IC.

[ ) U10: Install a 5369 IC (#443-750) into socket
U10.

( ] U8: Install a 7492 1C [#443-341 into socket U8.

( ) U9: Install a 74L8901C (#4434513) into socket
U9.

Detail 5-1A