AT&T Leich MAGNETO Bedienungsanleitung

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American Telephone and Telegraph Company

Printed in U. S. A.

BELL SYSTEM PRACTICES

Station Installation and Maintenance SECTION C41.106

Iuue 1, 9-30-45

AT&T Co Provisional

MAGNETO STATIONS

LEICH SET

1. GENERAL

1.01 This section gives general information relating to the

apparatus, use, connections and maintenance of Leich

magneto station wall sets.

1.02 Hand sets furnished with these wall sets are not of the

Leich types and maintenance information for the hand

sets is covered in other sections.

Z, APPARATUS AND USE

2.01 The Leich sets are wood wall sets having a dark oak

finish. The sets are of the anti-sidetone type and are

equipped with biased high impedance ringers. Sets may be

obtained with either a three or five bar hand generator, as

desired.

2.02 Code and piece part numbers of apparatus or parts

which may be required for replacement purposes are

listed below.

Leich Code or Pi-

Part No.

533A-2600

535A-2600

3A Generator

SA Generator

3C Hookswitch

26 Induction Coil

SA-2600Ringer

Pc 1086

Pc 1087

Pc 1092

Pc 1093

Pc 1098

Pc 1161

Pc 1164

Pc 1166

Pc 1185

Pc 1207

C41.106

Pace1

Description of Apparatus or Parts

Oak wall set having 3 bar hand generator

Oak wall set having 5 bar hand generator

3 bar hand generator

5 bar hand generator

Switchhook and switchhook contact as-

sembly

Anti-sidetone coil used with 335A-2600 or

535A-2600 Magneto Telephones

Biased high impedance ringer equipped

with gongs and gong standards

Gong locknut

Hexagonal nut for gong

Adjusting pivot for ringer

Locknut used with Pc 1092

Ringer magnet

Ringer biasing spring

Spring bracket for Pc 1161

Ringer armature

Generator magnet

Generator pinion

MAGNETOSTATIONS

LEICHSET

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Page 2

Leich Code or Piece

Part No. Description of Apparatus or Parts

Pc 1208 Generator pinion spring

Pc 1211 Generator gear

Pc 1214 Hub collar for Pc 1211

Pc 1215 Cap for Pc 1207

Pc 1240 3 bar generator armature

Pc 1241 3 bar generator gear shaft

Pc 1242 Generator contact assembly

Pc 1245 Generator crank and handle

Pc 1268 5 bar generator gear shaft

Pc 1270 5 bar generator armature

Pc 1546 Ringer yoke

Pc 2961 Locknut used with ringer yoke

Note: If screw of screw terminals requires replacement

the standard P-136632 screw (1/4" 6-32 galv. B.H.M.

screw) may be used.

3. INSTALLATION

3.01 Attach Leich sets to the various mounting surfaces with

the fasteners regularly used for attaching subscriber

acts.

3.02 The generator crank and handle and the hookswitch

lever (switchhook) are enclosed in a small envelope

placed inside the set. Attach hookswitch lever to the contact

assembly as indicated in Fig. 1. Place generator crank and

handle on generator in the usual man~~ru.' , ./

I I I'

l ! ! -.......

' I '

I I I

1, ' I I'

LoosenS'Nitchhooksetscrew,press

against upper end of hing::d O;Jeratlng

arm and slide switchhook through

slotted hole in side of set and

under set screw as shown.

Tighten set screw. Fig. I

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3.03 Where the use of a condenser in the induction coil

network is required (see 4.01) mount an 1149B 1/2 mf.

condenser on the door of the set as indicated in Fig. 2 (1st

position). Attach condenser with strap P-225255 and two 1•

No. 6 R.H. blued wood screws. Where it is local practice to

connect a condenser in series with the talking circuit, mount

a 149A 1 mf. condenser in the same location. If a condenser

is also required for the induction coil network, mount it in loca-

tion shown as 2nd position in Fig. 2.

FirstPosition

r----------------------------1;

2¼ in. : SecondPosition :F"" r~'-"2M· 'c'...Y

,--1.----------------- ------ 1..1...,,

1JinL~[ ______________________}~;

Fig.2

3.04 Where a KS-8058 (400 ohm) resistance is to be used in

the induction coil network, attach it directly to ter-

minals designated A and R in Fig. 2.

4. CONNECTIONS

Induction Coil Networks

4.01 The induction coil in the Leich set is equivalent in

electrical characteristics to the 104A induction coil used

in other magneto station sets. To obtain satisfactory sidetone

balance when used on the different types of subscriber loops

employed in the Plant, the induction coil networks used with

the 104A induction coil are also used with the Leich sets.

Table 1 in•licates the connections to be made in the sets to

obtain the proper network for the transmission codes specified

on the service order.

C41.106

Paael MAGNETOSTATIONS

LEICHSET

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TABLE 1

Zone Code Network Connection• (See Note)

Connect an •1149B (1/2 mf.) condenser be-

tween A and R

Connect a KS-8058 (

400 ohm) resistance be-

tween A and R

Connect an 1149B (1/2 mf.) condenser be-

tween C and R

Strap P-294521 or a piece of wire from C to R

•Condenser or resistance must be ordered sepa-

rately unless otherwise specified locally.

Note: Terminals A, C and R may not be designated in

the sets but location of these terminals is shown in

Fig. 2.

Line and Ringer Connection•

4.02 Line and ringer connections for the sets are the same

as those shown in Sections C64.141 and C64.142 for

high impedance ringers on magneto non-polarized ringing lines.

The short green ringer lead of the SA ringer corresponds to

the black ringer lead and the longer green ringer lead corre-

sponds to the red ringer lead of ringers in other station sets.

4.03 To facilitate making ringer connections three terminals

are provided on the door of the set just below the

ringer. These terminals are permanently connected to the Ll,

G and l2 terminals (line terminals) of the set but are not so

designated in the set. Lo.cation of the respective terminals is

shown in Fig. 3.

4.04 Where it is local practice to connect a condenser in

series with the talking circuit, connections to this con-

denser are made by cutting the loop provided in the green

wiring conductor which is turned back in the wiring form on

the door and then soldering the cut ends of the loop on the

lugs of the 149A condenser.

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Fig.3

Ringer Connection Limitations

- , - Green

t 8rown

White

4.05 Not more than 8 of the 535A sets (5 bar hand gen-

erator and

26(){)<d

ringer) should be connected to a

bridged ringing line having a loop resistance of lOO{)<d.The

number of sets which may be connected to lines of greater or

less resistance is in inverse proportion to the loop resistance,

e.g., 4 for a line with a

2000w

loop and 16 for a line with a

500"'

loop, etc. Where these limits are exceeded it will be nec-

essary to use other standard 5 bar hand generator sets such

as the 417P. In general, the 533A sets (3 bar hand generator

and

2600"'

ringer) are used on divided ringing lines but

used

on bridged ringing lines not more than 8 of these sets should

be connected to a line having a loop resistance of

800w.

The

permissible number of sets for bridged ringing lines of greater

or less resistance is proportional as in the case of the 5 bar

generator sets.

4.06 On bridged ringing lines the permissible number of

normal station ringers on the line shall be reduced by

one for each loud ringing bell connected thereto (392B or 592B

subscriber set).

C41.106

Page

MAGNETOSTATIONS

LEICH

SET

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t'aa-e6

Leich Set Connections

4.07 The connections for the Leich set are shown in Fig. 4.

On some of the sets the terminal designations shown

on the circuit label for the hand set cord may be incorrect but

the black, red and white conductors of the hand set cord should

be connected respectively to terminals 2, 3 and 4. These ter-

minals may be marked Y, R and G.

terminating hand set

cord, secure cord stay hook under screw head of terminal 1

(vacant). Some care is required in passing stay hook through

cord hole in side of set to avoid damaging hard rubber grommet.

Batt'"_-- -.,,R

Red

F"as.

5. NUMBER CARD HOLDER

Handset

Cord

5.01

If a station number card is required, either P-215591

or P-225816 may be attached to the front of the door

of this set as indicated in Fig. 5. The station number card

holder and station number card should then be added.

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ForP-225816

50JApparatusBlanklessClampingPlate

P-225815and ScrewP-136486

No.44 (.086) Drill 3/a /,--1---- .•.

in. deep.Starting / I ', 21/

64 ,n.Drill approx.

holefor ½ in.. • / i /, ¼ in. deep.

No.6 F.H.W. ~1-~ ½z in.--i4- ./ ·\ Clearanceholefor

Screw. . .1 .....____ . H~. ;rugon apparatus

1--:·-----~,.;:_-:4)~--1¾

2 in.} blank.

. \ '$--L I

l \ j /

' i ,/

_____ J_ _,/.

2½ in.

ForP-215591

50HApparatusBlanklessClampingPlate

P-215576and ScrewP-210167

No.44 (.086) Drill 3/

8 _,---r·-.,,

in.deep.Starting ,' 1

~·

\o/s,n. ',, 1/sin. Drill approx.

holefor ½ in. / 1 1--! -! , ¼in. deep.

No.6 F.H.W. ( ½s '"·Tp

\Clearanceholefor

Screw. 1 \ lugon apparatus

Ti___ - Jblank.

\ I

I I I

I \ /

2•12in. ',, I ,/

I --r---

. <t

Fig.S

I. MAINTENANCE

Hand Generator

6.01 The automatic cut-out should positively open and close

contacts when the handle is rocked back and forth to

the point where the armature just starts to turn. If the cut-out

fails to operate properly, correct this condition when possible

by adjustment of the contact springs or lubrication of the mov-

ing parts with a small amount of oil per KS-6232. The oil may be

applied with a toothpick. If the contact springs require adjust-

C41.106

Pqe7

■

AGNETO

STATIONS

LEICHSET

TCI Library https://www.telephonecollectors.info/

ment adjust these as necessary with a No. 466A tool or equiva-

lent without making a visible kink in the springs. Follow be-

tween front and transfer springs should be approximately 3/64...

Gauge by eye. See that the tension on the transfer spring

sufficient to assure that the back contact will be made in the

normal position.

6.02 When operating the hand generator

there

is a ten-

dency for the shaft to stick or turn hard due to lack

lubrication apply a slight amount of oil per KS-6232 with

toothpick at the oil holes provided in the shaft bearings. If

after lubrication the generator still turns hard, it may be due

to poor insulation of the bushings in the spring pile up or

partial short-circuit in the armature.

the generator turns

freely but no ringing current is applied to the line terminals,

spring adjustment may be faulty or

armature

winding open.

Switchhook

6.03 When the hand set is removed from the hook, the

switchhook shall move upward freely without binding

and

come to a positive stop.

switchhook binds on the

hinge

pin,

replace entire switchhook assembly.

6.04 Contacts shall make with a perceptible follow. Separa-

tion between contact springs shall be minimum .010...

Gauge

by eye.

Ringer

6.05 Ringer gongs are eccentric and where gong adjust•

ment is necessary, loosen the hexagonal nut and locknut

and rotate gong as required. Retighten hexagonal nut and

locknut.

6.06 If armature sticks or binds on adjusting pivot remove

and clean pivot in the same manner as for other

ringers

with

adjustable pivots. Replace adjusting pivot.

6.07

As adjusted by the factory ringers will generally oper-

ate satisfactorily under most conditions encountered on

lines

to which the sets are to be connected. Some improvement

in ringing efficiency may be obtained in some cases by changing

the biasing spring tension.

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