Service manual

Emerson Radio
11. SECONDARY AREA RECEPTION — Noise
conditions in secondary areas of signal reception
(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. References are
lo the schematic diagram.
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 V4; re-
connect to junction of LI, C16, and R16.
c. Do not make this change for sets operating in
primary signal areas.
T-9-, C-64-, T-8
R-60 R-IOO R-96
it ii n n Jl
R-62(B+,I50V)
R-6l(B-,-l9SV)
TUNER
V-Z9
C-66
T-12
L-12
C-4O(20OV)
C-42(I50V>
C-74(I96V)
0-21 (-I74V)
C-39(200V)
C-4KI80V)
C-S6(IOBV)
C-291-I96V)
VIO. OET. OUTPUT (V-4)
AGC BUS(-?..8V, ANT. SHORTED)
T-7
V-IO
V-9
C-80
R-94(VERT. MOLD)
INDICATED VOLTAGES
MEASURED TO CHASSIS ,
WITH ALL FRONT CONTROLS
COUNTER-CLOCKWISE AND
REAR CONTROLS NORMAL;
NO SIGNAL INPUT.
Figure 5-13—Bottom View of Chassis
12. CABINET PARTS LIST (Models 614. 637. 644, 647).
ITEM
Cabinet
Cabinet back
Safety glass
Mule
Mask extrusion
Panel gasket
Cabinet feet
Selector escutcheon
Bakehte 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 insert — 3/16 shaft
PART NO.
MODEL 614
140279
560097
635023
410805
520103
450044
45005 IS
450045
450045
450046S
450041S
450O46S
587011
587012
587013
MODEL 637
140276
560103
635020
445008
450044
45005 IS
450045
45O045
450046S
450041S
450041S
587011
587012
587013
MODEL 644
140320
560109
520119
410859
591014
445009
450044
450045
450045
450046S
45004 IS
45004 IS
45005 IS
587011
587012
587013
MODEL 647
140325
560115
520119
410859
591014
445009
450044
450051S
450045
450045
450046S
450041S
45004 IS
587011
587012
587013
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