Heathkit IM-16 Installation instructions

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595-889-03

Assembly
and
Operation
of the
SOLID-STATE
VOLTMETER
Model lM-16
HEATH COMPANY
BENTON HARBOR,
M|CHIGAN 49022
TABLE OF CONTENTS
Introductiofl. ... ... r...... .... c...
Parts LiSt. "..... o. r r... r........
Step-By-Step Assembly
Circuit Board Assembly., . . . . . . c .
Switch Prewiring And Subpanel
Assembly. . . .. o........... r..
Front Panel Mounting And Wiring. . . .
Cable Assembly Wiring. . . . . . . . . . .
Front Panel Assembly Installation. . " "
Circuit BoardWiring.......... o r o
Rear Panel Assembly, Wiring And
Installation. . . .... r..,. o.. o.,.
Meter-Knobs-Battery Installation" . . .
Probe Assemb1y. r.... ...... ....
Calibratiofr. . . . . . . . . . . . . o o . . o , , . .
Final Assembly. o . . . . .. ... ... . . . ' ..
Operation... o... r... r.... o. r. o c i.
In Case Of Difficulty. " . ..r .. . . . . . . .. .
Troubleshooting Chart. . . . . . . . . . . o o o .
MaintenanC€. . . . . . o . . . , , . . . . . r . . r .
Accessory Probgs" o o . . . .,. oo.. i. c
Speeifications. .. . . . . .. ... . . i o . . . ..
Circuit Dgscriptioh. . .. .. . . . o . . . . . . .
FactoryRepairService.,.. ... ..
Functional Parts List. . .. ... ..
Chassis Photograph. c . . r . o . . r € .,
Circuit Board X-Ray View
(fold-out from Page). . . . . . . . r . r
Replacement Parts Price List" . . . .
Voltage Chart. . .(fold-out from page).. . .
Schematic. . .(fold-out from page).
2
3
4
B
10
72
13
L4
16
1B
20
22
24
26
30
31
32
32
33
34
3?
3B
39
40
40

INTRODUCTION
The Heathkit Model IM-16 Solid-State Voltmeter
combines the features of a vacuum tube volt-
meter and the portability of a volt-ohmmeter
in an attractively styled cabinet. Operationfrom
the power line or from the internal battery is
selected by a single switch. Battery operation
permits accurate voltage and resistance meas-
urements at remote locations without an AC
power source.
All measurement functions (AC Volts, DC- or
DC+ Volts, or Ohms) are selectedbyoneswitch.
Separate range switches are provided for Volts
and Ohms. Voltage readings as low as .01 volt
and resistance readings from .2 ohms to over
500 megohms are read on the large 6 inch
meter. The separate scales for the lower AC
voltage ranges are required to follow diode
response at lower applied voltages.
Additional features of the Solid-State Voltmeter
include: a printed circuit board and a cable
assembly for easyandneat construction, a single
test probe to eliminate tangled test leads, and a
dual-winding fower transformer that allows you
to wire the Voltmeter to operate from either a
120 or 240 volt AC power source.
All of these features combine to give you a
versatile, attractive, and accurate test instru-
ment for long and dependable service at mini-
mum cost.
Refer to the "Kit Builders Guide" for complete
information on unpacking, parts identification,
tools, wiring, soldering, and step-by-step as-
sembly procedures.

PARTS LIST
NOTE: The numbers in parentheses inthe Parts To order replacement parts, refer to
List are keyed to numbers on the Parts Picto- Replacement Parts Price List and use
rial (fold-out from Page ?). Parts Order Form furnished with this
the
the
kit.
PART PARTS DESCRIPTION
No. Per Kit PART
No. PARTS DESCRIPTION
Per Kit
RESISTORS
1/2 wortt
(1) 1-103
1- 119
1-1 3
r-20
L-22
t-25
t-26
1- 30
1- 35
1- 38
2-3t
2-33
SWITCHES
(11)63-433 1 3-position, l,wafer (Power)
1 33 Q (orange-orange-b1ack) (12)63-434 1 ?-position, l-wafer (Ohms)
1 560 Q (green-blue-brown) 63-463 1 4-position, 4-wa-fer
1 2700 Q (red-violet-red) (Function)
2 t0 KQ (brown-black-orange) 63-464 1 B-position, 3-wafer (Volts)
2 22 KQ (red-red-orange)
2 41 Ko (ye11ow-violet-orange) DIODES-TRANSISTORS-LAMP
1 100 KQ (brown-black-
yellow) (13) 56-31
1
1
2
2?0 KO (red-violet-yellow) (L4)57-21
1 MO (brown-black-green) (15)41?-118
3.3 MO (orange-orange- (16)41?-140
6.8 volt zener diode
Silicon diode
2N3393 transistor
Field eff ect transistor (FE T)
Neon pilot lamp
Cabinet half shell
Chassis
Front panel
Subpanel
Rear panel
Battery bracket (1-1/2 volt)
Battery bracket (9 volt)
End cap
Side rail
Front panel bezel
Grommet (B halves)
Line cord strain relief
(for round cord)*
Line cord strain relief
(for flat cord)
Handle
Cup insulator
Foot
Line cord retainer
Pilot lamp lens
Pointer knob
Plain knob
1
4
6
1
1
green)
Precision 1%, 1/2 Wortt
(2) 2-131 1 10 c,
2-24 1 90 s,
2-29 1 900 s}
(17)4t2-t5
90- 346-2
(18) 2oo-493
203-486- 1
(19) 203-487-1
203-488-1
(20) 204-254
(2t) 204-77e
(22) 204-75e-L
(23) 204-?60-1
2L0-34
(24)73-27
(25) 75-30
7 5,71
(26) 211-32
(27)26L-42
(28) 261-28
(2e) 261-30
(30) 413-10
462-245
462-246
METAL PARTS
2-39 1
2-40 1
2-42 1
2-45 1
2-t46 1
2-t47 1
Precision I %,
(3)2-56-1 1
2-55-L 1
CAPACITORS
(4) Zt-Zt 1
(5) zs-ror z
(6)es-tsr 1
(7)25-54 1
CONTROLS
(B) 10-21e 2
(e) 10-57 2
(10) 12-80 1
I 2t62 r, (2.162 Ks,)
1 6838 O (6.838 KO)
21.62 KQ
68.38 KO
216.2 KQ
683.8 KQ
2,162 MQ
6.838 MQ
Wdtt
632.4 KQ
1.3676 MQ
PLASTIC PARTS
1
1
4
2
1
4
1
.005 pfd disc
,015 trrfd tubular
250 pfd electrolytic
10 pfd electrolytic
2000 f}
10 KO tab mount
50 Kf) dual tandem, tab mount
*This strain relief is supplied for use in areas
ma.inly outside the U. S., where 2- ot S-wire
round cords are required.

nr*un @
PART
No. PARTS DESCRTPTION
Per Kit PART
No. PARTS DESCRIPTION
Per Kit
WIRE
89-23
134- 1 60
344-59
341-1
343-11- 1
OTHER HARDWARE
1
1
1
1
1
1
1
1
1
1
1
1
2
1
Line cord
Cable assembly
Hookup wire
Black test lead
Shielded test lead
Front body
Center body
Rear body
Probe tip
Switch lever
Insert insulator
Contact spring
Rivet
E washer
6-32 x 1/4" black screw
6-32 x 1/4" phillips head
screw
6-32 x 3/8" screw
#6 x t/4" sheet metal screw
6-32 xlf2" screw
6-32 decorative screw
6-32 x 7/t6" spacer stud
6-32 nut
#6 fiber shoulder washer
#6 lockwasher
#6 solder lug
MISCELLANEOUS
4-40 x lf4" screw
4-40 nut
#4 lockwasher
Control nut
Control flat washer
Control lockwasher
Speednut
Power transformer
100 microampere meter
Circuit board
2-lug terminal strip
3-lug terminal strip
Battery connector
Battery holder spring
Alligator clip
Alligator clip with threaded
insert
Phone jack
Phone plug
Knob bushing
Line cord plug adapter
Nut starter
Identification label
Kit Builders Guide
Parts Order Form
Manual (See front cover for
part number.)
Solder
(51) 250-52
(52)zez-z
(53) 254-e
(54) 252,1
(55) 253-10
(5q zsq-q
(57\ 252-7s
54-117
407 -125
85-1?8- 1
(58) 431-2
(5e) 431-10
(60) 432-33
(61) 258-?
(62) 260-1
260- 51
(63) 436-20
(64) 438-28
(65) 455- 50
432-27
490- 5
391 - 34
59?-308
597-260
10
10
10
11
6
3
1
PROBE PARTS
(3 1) 45e-44
(32) 45e-45
(33) 45e-43
(34) 477-tt
(35) 45e-46
(36) 45e-47
(37) 258-53
(38) 256-15
(3e) 253-51
1
1
1
1
1
1
1
1
1
1
1
6
1
1
1
1
1
1
#6 HARDWARE
(40) zso-rro 1?
(4t)zso-zze e
(42) 250-8e
(43) 250-365
(44) 250-t62
(45) 250-303
(46) 250-304
(47) 252-3
(48) 253-2
(4e) 254-L
(50) 25e-1
2
B
4
4
4
12
3
11
3
Before you start to assemble this kit, read the
Kit Builders Guide for complete information on
wiring, soldering, and step-by-step assembly
procedures.
CIRCUIT BOARD ASSEMBLV
Components will be installed on the circuit
board by following the steps on Pictorials 1
STEP-BY-STEP ASSEMBLY
NOTE: One t-L/Z volt C-cell battery, and one
9-volt (NEDAI602) battery will be required for
operation of this completed volt ohmmeter. You
may want to purchase these batteries now, to
have them ready when you finish assembling
the kit.
and 2. Position the parts as showninthe Pictor-
ials. Resistors will be called out by resistance
value (in Q, KQ, or MO). The color code will
also be given for color-coded resistors. Some
precision resistors may be marked in O or KQ.
For example, 2162 gl = 2.L62 KQ. Be sure to
install the correct resistor in each step.

@ n"r"u
CONT INUE
{...2
START
( ) Locate the circuit board (#85-
1?8-1) and position it lettered
side up as shown in Pictorial 1.
Then perform the following
steps. Do not solder or cut off
any leads until you are directed
to do so in a step.
( ) 100 KO (brown-black-yellow)
( ) 560Q (green-blue-brown).
( ) ZZOO Q (red-violet-red)"
NOTE: Precision resistors are
identiJied by resistance value.
MA = megohm = 1,000,000 ohm
KQ = kilohm = 1,000 ohm
Example: 2.162 Kf,) = 2162 n
NOTE: The Solid-State Voltmeter
can be wired for use with either a
120 volt AC power source or a 240
volt AC power source. Followeither
the 120 VOLT WIRING steps or the
240 VOLT WIRING step, whichever
applies to your needs. ( ) 6.838 MO 1% precision.
( ) 2.162lAlO L% precision.
I2O VOLT WIRING
( ) 1" bare wire. Use hookup wire
with insulation removed.
( ) 1" bare wire.
( ) 683.8 KO 1ft precision.
( ') 216.2 KQ 170 precision.
( ) 68.38 KO 1$ precision.
( ) ZL.AZ KQ 170 precision
240 VOLT WIRING
( ) 3/4" barewire.Usehookupwire
with insulation removed.
\_l u
,.+lr-J
I l. ,
( ) Solder all connections and cut
off the excess lead lengths.
( ) 6.838 KQ l/e precision.
( ) 2,162 KQ 170 precision.
( ) 10 KSl (brown-black-orange ( ) 900 Q lft precision.
( ) 10 KSl (brown-black-orange). ( ) 10 O 170 Precision.
( ) 90 f,) 170 precision.
( ) 3.3 MO (orange-orange-
( ) 22 Ka (red-red-orange).
( ) ss n (orange-orange-black).
( ) 4? KO (yellow-violet-orange
) 22 KA (red-red-orange). ( ) 270 KO (red-violet-yellow).
( ) 47 KO (yellow-violet-orange) ( ) Solder all connections and cut
off the excess lead lengths
PROCEED TO PICTORIAL 2
( ) Solder all connections and cut
off the excess lead lengths.
PICTORIAL I

START
CONTINUE
PICTORIAL 2

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6-32x1/4"
ELACK SCREW
$
46 SOLDER LUG
d6 FIBER SHOULDER IVASHER
Detqil 3A
( ) Mount the battery bracket assembly to the
chassis as shown in Pictorial 3. Use two
6-32 x t/4" blaek screws, #6 lockwashers,
and 6-32 nuts.
( ) Set the chassis aside temporarily.
9 VOLT
BATTERY BRACKET
cHASStS
t-t/2 voLT
EATTERY
BRACKET
d4 LOCKTIASHER
4-40 NI.JT
B
1
ts
I
#6 LOCKWASHER
6-32 NUT
PICTORIAL 3
Refer to Pictorial 3 for the following steps.
( ) Locate the chassis (#200-493) and position
it as shown.
( ) Mount the circuit board to the chassis with
ten 4-40 x t/4" screws, #4 lockwashers,
and 4-40 nuts. Do not tighten the screws
until all of them are installed.
( ) Mount the 9-volt battery bracket as shown.
Use three 6-32 x l/4" black screws, #6
lockwashers, and 6-32 nuts.
( ) Refer to Detail 3A and install the cup insu-
lator, #6 fiber shoulder washer, and #6
solder lug at one end of the 1-1/2 volt
battery bracket. Use a 6-32 x 3/8" screw
and a 6-32 nut. Be sure the mounting holes
are positioned as shown.
( ) At the other end of the t-L/Z volt battery
bracket, mount the battery holder spring,
two #6 fiber shoulder washers, and a #6
solder lug. Use a 6-32 x 3/B".screw and a
6-32 nut.
BATTERY HOLDER
SPRING
6-32 t3/82 ,6 FIBER
SHOULOER WASHER
l-1,/2 voLT \
BATTERY HOLDER
BRACKET

n"*ut @
NOTE WIDE
SPACE BETWEEN
LUGS 2 AND 5
NOT€: WHEN INSTALLINc OIODES. BE SURE TO
PLACE THE CATHOOE ENO A5 DIRECTEO. THE
CATHOOE END I5 MARKED IVITH EITHER A COLOR
END,COLOR OOT. COLOR BA ND. OR A SYMBOL.
SYMBOL
COLOR COLOR COLOR (CA THODE
OOT 8A ND END END)
SWITCH PREWIRING AND SUBPANEL
ASSEMBLY
Refer to Pictorial 4 for the following steps.
( ) Locate the 8-position, 3-dafer switch
(#63-464) and position it as shown.
( ) Connect the 1.36?6 MQ 1 watt precision
resistor between lug 2 (NS) and lug 5 (NS)
on waJer 1 of the switch.
( ) Cut one lead of the 632.4 KQ 1 watt pre-
cision resistor to L/2". Connect this lead
to lug 2 on wafer 1 (S-2). The other lead of
this resistor will be connected later.
( ) Remove the insulation from at-l/4" hookup
$rire. Connect this 'bare wire from lug 6
of wa.fer 1 (S'1) to lug 6 of wafer 2 (S-1).
Detoil 4A
( ) Connect the lead from the cathode end of
another silicon diode to lug 4(S-2), and the
other lead to lug 2 (NS) of wafer 2. Position
the diode as shown.
( ) Connect the cathode lead of the remaining
silicon diode to lug 2 (S-2), and the other
lead to lug 11 (S-1) of wafer 2. Position the
diode as shown.
( ) Set the switch aside temporarily.
Refer to Pictorial 5 for the following steps.
( ) Locate the subpanel (#203-48?-1) and posi-
tion it as shown.
( ) Mount the 2-lug terminal strip at A. Use a
6-32 x L/4" black screw, two #6 lock-
washers, and a 6-32 nut as shown in Detail
5A.
( ) Connect the lead from the cathode end of a
silicon diode (#57 -27) to lug I (NS) and the
other lead to lug 4 (NS) of wa"fer 2, Position
the diode as shown. Refer to Detail 4A for
identification of the cathode lead.
PICTORIAL 4
t5f-27
{NOTE
CATHODE
VOLTS RANGE
swtTcH (963-4641
'i::..
..:::.:r.j.:i... A.
,.,,t",-1';,r'ti'., 1,1,q,,. #)
::1 ..:::.:::i::..::::.:.:.:tjl/.- 6_32 x I /4"
' .'.r.::jj'r':,.j.i::i:::jjjjjjj BL ACK SCR EW
C6 LOCKWASHER
Detail 5A

SUBPANEL
: Page9
@
TWIST TABs
.I /8 TURN
Detqil 58
Mount the 50 I(fl dualtandemtabmountcon-
trol (#12-80) at B. Refer to Detail 5B and
tudst the tabs 1/8 turn to securethe control
to the subpanel.
In a like manner, mount the two 10 KO tab
mount controls (#10-5?) at C and D.
NOTE: When you mount the switches in the fol-
lowing steps, position the rvafer spacers in a
line parallel with the edge of the subpanel. Some
of the switches supplied with your kit may have
tabs that are offset 30 degreesfrom those shown.
Be sure the tab goes in the correct tab hole;
then secure the switch to the subpanel with a
control nut. See Detail 5D.
( ) Mount the prewired 3-waJer switch (#63-464)
at M.
( ) Mount the 4-position, 4-wafer switch
(#63-463) at L.
NOTE: The following system will be used to
identify switches and their wafer and lug num-
bers. The letter will identify the switch. The
first number will identify the wafer, counting
from the lmob end of the shaft. The number that
follows the dash will identify the lug" For ex-
ample, M2-4 would refer to switch M, wafer 2,
lug 4. The switches, wafers, and lugs are called
out on the Pictorials when they are used in ac-
companying steps.
( ) Connect the free lead of the 632.4 KQ pre-
cision resistor, that comes from ML-z,
to solder lug E (NS).
( ) Connect one lead of a .015 ptfd3KV capaci-
tor to solder lug E (S-2), and theother lead
to M2-9 (NS). Position the capacitor as
shown in Pictorial 5.
()
()
Connect a 3.3 MO (orange-orange-green)
resistor from L1-10 (S-1) to L2-10 (NS).
Connect one lead of a .015 pfd 3 KV capaci-
tor to Ml-5 (S-2), andtheotherleadto L2-8
(S-1). Position the capacitor as shown.
()
()
Mount the ?-position, l-wafer switch
(#63-434) at K.
Mount the 3-position, 1-wafer switch
(#63-433) at N.
)N
()
()
( ) Install a #6 solder lug at E. Use a 6-32 x
If 4" blaek screw and a 6-32 nut"
( ) Refer to Detail 5C and installthephone jack
at G. Use a control lockwasher and control
nut, and position the lugs of the jack as
shown in Pictorial 5.
CONTROL
LOCKWASHER
CONTROL NUT
Detqil 5C

n"*uto @
SPEEDNUT
PILOT LAMP LENS
Detail 6A
FRONT PANEL MOUNTING AND WIRING
Refer to Pictorial 6 (fold-out from Page 11) for
the following steps.
( ) Locate the front panel and position it as
shown. Place a towel or soft cloth on your
work surface to avoid scratching the panel.
( ) Refer to Detail 6A and install the red pilot
lamp lens at F. Press the speednutoverthe
Iens and firmly against the inside of the
front panel.
( ) Install a 2000 Q control (#10-219) at H.
Use a control lockwasher, control flat-
washer, and control nut as shown in Detail
6E}. Position the lugs ofthecontrolasshown
in Pictorial 6.
Detoil 68
( ) tn a like manner, install the other 2000 sl
control (#10-219) at J.
( ) Locate the front panel and install plastic
grommets in the four recessed holes at K,
L, M, and N. Refer to Detail 6C and press
the two halves of each grommet together
until they lock in the hole.
( ) Place the front panel against the front of
the subpanel so the four switch shafts pass
through the plastic grommets. The pilot
lamp lens should go into hole F on the
subpanel, and the lugs of controls H and J
should not touch the edges of the cutouts.
LOCKWASHER
CONTROL FLAT VIASHER
CONTROL NUT

@ nu*"tt
CONTROL NUT
CONTROL FLATWASHER
()
()
()
()
HALF OF
PLASTIC GROMMET
HALF OF
PL ASIIC GROMMET
Detqil 6c
Secure the subpanel to the front panel with
a control flat washer and a control nut on
each switch bushing as shown in Detail 6D.
Strip 1-1,/2" of insulation from a piece of
hookup wire and place this insulationonone
lead of the neon pilot lamp.
Insert the pilot lamp into the pilot lamp
Iens at F. Then connect the insulated lead
to lug 1 (NS) and the otherleadto lug 2 (NS)
of terminal strip A.
Prepare the following six lengths of hookup
wire by first cutting each wire to the indi-
cated length, and then removing L/4" of. in-
sulation from each end. The wires are listed
in the order in which they will be used.
TCH BUSHING
Detqil 6D
( ) Connect a 4" hookup wire from lug 2 of
phone jack G (S-1) to switch L2-5 (S-1),
NOTE: In the following steps, only one end of
each hookup wire will be connected. Eaeh step
will call out the wire length, the switch lug,
and soldering instruction.
( ) 2-L/2" wire to L3-1 (S-1). Be sure to
solder the wire to both the front and rear
lugs on wafer 3,
( ) 3" wire to L3-6 (NS).
( I g-t/+" wire to L2-12 (S-1).
( ) 3-L/2" wire to L2-10 (S-2).
( ) Position the wires toward the rear of the
switch.
[j',,'l 3tt
3-L/4"
3-L/2"
( ) Connect a 4" hookup wire from lug 1 of
phone jack G (NS) to lug 2 of control J (NS).

CABLE ASSEMBLY WIRING Connect the wires from breakout #5 as follows:
Refer to Pictorial ? for the following steps. ( ) Gray to lug 3 of control B (S-1).
NOTE: In the followingsteps,thecableassembly ( ) White-red to lug 2 of control B (S-1).
wires will be connected to components that are
mounted on the subpanel. Notice that the cable ( ) Wtrite-orange to lug b of control B (S-1).
assembly has various colored wires from each
of the ten breakouts. Breakout#l has nine wires.
Refer to the Pictorial for the position ot ;i*" ( ) White-brown to lug 4 of control B (NS).
and location of connections' ( ) Either white-blue to lug z of terminal
strip A (S-2).
connect the wires from breakout #1 as follows: ( ) other white-blue to lug 1 of terminal
( ) white-orange to lug 1 of control J (s-1). strip A (s-2)'
( ) white-yeltow to lug 2 of controt J (s-2). :""?:ir""t-t1," wires from breakout #6 to control c
L.
( ) White-red to lug 3 of control J (S-1). ( ) Orange to lug Z (S_1).
( ) lvtrlte-green to L1-5 (s-1). ( ) Both viotet to lug B (s_z).
( ) Black to L3-4 (S-1).
( ) Orange to L3-5 (S-1). Be sure to solderthe
wire to both the front and rear lugs on
wafer 3.
( ) violet to L3-6 (s-2).
The green and blue wires from breakout #1
and the white-yellow wire from breakout #2
will be connected later.
connect the wires from breakout #B as fo[ows: H"Jai:?]the remainingbreakoutswillbecon-
( ) Brown to L3-12 (S-1).
( ) Red to L3-3 (S-1).
Connect the wires from breakout #4 as follows:
( ) Both blue wires to lug 1 of control H (S-2).
( ) Green to lug 2 of controt H (S-1).
( ) Yellow to lug 3 of control H (S-1).
The gray wire and the white-brown wire from
breakout #4 will be connected later.
Connect the wires from breakout #? tocontrolD
as follows:
( ) Brown to lug 2 (S-1).
( ) Viotet to lug 3 (S-1).
The yellow wire andthe white wire from breakout
#? will be connected later.
( ) Connect the white-greenwirefrombreakout
#8 to switch M2-9 (S-3).
( ) Connect the lead from the positive (+) end
of a 10 trlfd electrolytic capacitor to lug 1
of phone jack G (S-2). Connect the other
lead to lug 4 of control B (S-2).
( ) Carefully examine all connections. Every
lug that has a wire or lead attached to it
should have been soldered. There shouldbe
no blank lugs on wafers trZ,and3 of switch
L, or on waJers 1 and 2 of switch M. No
connections should have been made to any of
the lugs on the end wafers of any switch.
( ) Set the front panel assembly aside,

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Page 13
SIDE RAIL
6-32x1/4"
ELACK SCREWS NOTE
@g! tN rHls END PICTORIAL 8
FRONT PANEL ASSEMBLY INISTALLATION
Refer to Pictorial B for the following steps'
( ) Locate the chassis assembly and position
it as shown in the Pictorial, ( )
( ) Mount a side rail at eachendof the chassis"
Use two 6-32 x Lf 4" black screws in the
holes indicated in the Pictorial, ( )
( ) Position the front panel assembly over the
chassis and line up the pins of the four
switches with the correspondingholes inthe
circuit board" Then very carefully insert the
pins into the holes as you lower the panel
assembly into Place,
Place the bezel over the front panel with
the slotted ends between the side rails and
the panel"
Secure the front panel and bezel to the side
rails" Use a 6-32 x'lft6" spacer stud and
two 6-32 x lfz" screws at each end of the
panel.
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SCREW

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CIRCUIT BOARD WIRING
Refer to Pictorial 9 (fold-out from Page 15) for
the following steps.
In the next four steps you will connect the four
hookup wires that come from VO switchLto the
circuit board. The circuit board holes for these
wires are lettered to indicate the switch lug and
wafer from which they come. These steps will
call out the connections in the same way. Pass
the end of each wire through its hole in the
circuit board; then solder the end ofthe wire
on the foil sideandclipoff anyexcess wire ends.
( ) VO switch lug 10 wafer 2 (S-1).
( ) VO switch lug 12 wafer 2 (S-1).
( ) VO switch lug 1 wafer 3 (S-1).
( ) VO switch lug 6 wafer 3 (S-1).
In the following steps you will connect the wires
from the cable assembly to the circuit board.
Each step will call out the wire color. Pass the
end of the wire through the hole marked with
the wire color. Solder each wire onthe foil side
of the circuit boardrand clip off anyexcess wire
ends.
( ) Gray to GRAY (S-1).
( ) Wfrite-brown to'rI/HT/BRN (S-1).
White-ye1low to WHT/YEL (S-1).
Green to GRN (S-1).
Blue to BLU (S-1).
Yellow to YEL (S-1).
White to WHT (S-1).
Shorter white-b1ue to inner WHT/BLU (S-1),
Longer white-blue to WHT/BLU hole near-
est the edge of the circuit board (S-1).
Locate the 9-volt battery connector and con-
nect its leads to the circuit board holes
marked BATT: Connect the red lead to +
(S-1) and the black lead to - (S-1).
Position the unit as shown in Detail gA for
the following steps.
Remove l/4" of. insulation from each endof
two 4" hookup wires"
Connect one end of either 4" wire to a hole
marked LINE on the foil side of the circuit
board (S-1). Then connect the other 4"wire
to the other hole marked LINE (S-1). The
other ends of these wires will be connected
later.

@ nu*utu
I UNSOLDERED HOLE
FOR I20 VOLT OPERATION
3 UNSOLDERED HOLES
FOR 240 VOLT OPERATI
( ) Solder all switch pins to the circuit board
foil. Do not cut off the switch pins.
( ) Check the circuit board carefully tobe sure
all connections are properly soldered, and
that no solder bridge hasbeen madebetween
the foils. Detail 9A shows the locations of
switch pins and ends of interconnecting
wires that were soldered in the preceding
steps.
4'' HOOKUP WIRE
NOTE: ff your Voltmeter was wired for 120volt
operation, there should be only one unsoldered
hole on the circuit board. If wired for 240 volt
operation, there should be only 3 unsoldered
ho1es. (See Detail 9A.)
( ) Set the unit aside temporarily.
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Detoil 9A