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11.
SECONDARY AREA RECEPTION — Noise
conditions
in secondary areas
(fringe areas), or in areas where noise is excessive
compared to signal level, give rise to problems of sync
stability.
For such areas only, the following simple
changes should be made in the circuit.
to the schematic diagram.
FUS£-i
L-S(HOR.StZE>
L-7(HOR.LIN.)
R - 6 8 — ------- —
C~52-----------^
8 -6 2 (8 + , 150V)
ft~0l<8%H95V)
T U N ER ----------
12.
CABINET PARTS LIST (Models 614, 637, 644, 647).
ITEM
Cabinet
Cabinet back
Safety glass
Mask
Mask extrusion
Panel gasket
Cabinet feet
Selector escutcheon
Bakelite front
Knob — Fine Tuning
Knob — Selector
Knob — Contrast
Knob —
Brighntess
Knob — Vert. Hold
Knob — Off-Volume
Knob — Hor. Hold
Spring insert— 1 / 4 shaft
Spring insert— 3 /8 shaft
Spring itisert— 3 /1 6 shaft
of signal reception
References are
T-9-, C ' 6 4 -
T-8
t
Figure 5-13— Bottom View of Chassis
MODEL 614
MODEL
140279
560097
635023
410805
----
-------
-------
520103
-------
450044
45005IS
450045
450045
450046S
450041S
450046S
587011
587012
587013
Scanned by mbear2k - Jan 20121/17
a.
Remove end of R8 connected to CIO and the AGC
bus; reconnect to chassis.
b.
Remove end of R17 connected to pin 7 of V 4; re
connect to junction of LI, C l6, and R16.
c.
Do not make this change for sets operating in
primary signal areas.
PART N O .
637
MODEL 644
140276
140320
56010S
560109
635020
520119
----
410859
-------
591014
445008
445009
445017
-------
-------
-------
450062
-------
450044
450044
450045
45005IS
450045
450045
450046S
450045
45004IS
450046S
45004IS
45004IS
45004IS
45005IS
587011
587011
587012
587012
587013
587013
Emerson Radio
-T-I2
L*I2
C« 4 0 (2 0 0 V)
C *4 2 (I5 0 V )
C-74 (196V)
C-21 (-I74 V )
C~39(200V)
C -4 *(!8 0 V *
C ~ 5 8 (I0 8 V )
C~29(-198V)
VOX DET. OUTPUT (V~4)
AGC BUS (-3.8V, ANT. SHORTED)
-
-7 :
t
-V-iO
- V -9
«
-C -8 0
• R - 9 4 ( VERT, HOLD )
INDICATED VOLTAGES
MEASURED TO C H A S S IS ,
WITH ALL FRONT CONTROLS
COUNTER-CLOCKWISE AND
REAR CONTROLS NORMAL;
NO SIGNAL INPUT.
M ODEL 647
140325
560115
520119
410859
591014
445009
-------
-------
-------
450044
45005IS
450045
450045
450046S
450041S
450041S
587011
587012
587013
21
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