NOTf
1 SELECTOR SWITCH I AM 2 FM 3 PHONCXI) 4. PH0NCX2) 3. AUX 6. MIC 7. COMMON
2 ALL RESISTANCE VALUES IN OHMS KKILOHM M:MEGOHM,ALL RESISTORS 1/4W UNLESS OTHERWISE SPECIFIED
3 UNLESS OTHERWISE NOTED IN SCHEMATIC ALL CAPACITORS IN MFD PF PICOFARAD
4 THERE MIGHT BE SLIGHT CHANGES IN THE ACTUAL SET
3 ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED, DC VOLTAGES SHOWN ARE MEASURED FROM CHASSIS
WITH
NO SIGNAL INPUT, LOUONESS SWITCH IN OFF
POSITION.
LINE
VOLTAGE
I20V
AC,
USING
A HIGH IMPEDANCE DIGITAL MULTIMETER
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS,
UNDER NO CIRCUMSTANCES SHOULD
THE ORIGINAL DESIGN BE MODIFIED
OR ALTERED WITHOUT PERMISSION
FROM THE ZENITH RADIO CORPO-
RATION.
ALL COMPONENTSSHOULD
BE REPLACED ONLY WITH TYPES
IDENTICAL TO THOSE IN THE ORIG-
INAL CIRCUIT. SPECIAL COMPO-
NENTS ARE USED TO PREVENT
SHOCK AND FIRE HAZARD. THESE
CRITICAL COMPONENTS ARE SHADED
ON THE SCHEMATIC AND PARTS
LIST FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OC-
CASIONALLY DIFFER FROM THE
ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST
SAFETY AND PERFORMANCE IM-
PROVEMENT CHANGES INTO THE
SET IS NOT DELAYED UNTIL THE
NEW SERVICE LITERATURE IS
PRINTED.
TEST
POINTS
A
FM.
ANTENNA INPUT
D
1ST. FM.
IF.
INPUT
F
MPX. INPUT
G
FM
IF OUTPUT
H
FM
DETECTOR OUTPUT
K
AM IF INPUT
L
AM.
RF INPUT
M
19KHZ OSCILLATOR OUTPUT
SWITCHES
SW
1
SELECTION AM FM PHONO(1) PHONO(2) AUX MIC)
SW
2
TAPE
DUBBING (1-> 2 OFF 2->1)
SW
3
TAPE
MONITOR (1 SOURCE 2)
SW4
MODE
(STEREO - MONO)
SW5
LOUDNESS
(ON
-
OFF)
SW6
FM
MUTE
(ON
-
OFFJ
SW7
HIGH
FILTER (ON-OFF)
SW8
LOW
FILTER (ON- off)
1W9 DE
EMPHASIS
(
25us
-
75us)
SW10
SPEAKER (OFF A
.
B
.
A+B)
SW
1 1
POWER
(ON-
OFF
)
SW3 TAPE MONITOR SWITCHES
1,5
PLAY BACK
(1)
RIGHT
2,6
SOURCE RIGHT
3,7
FLAY
BACK(2)
RIGHT
4,8
COMMON RIGHT
9,11
PLAY BACK(1) LEFT
10,14
SOURCE LEFT
11,15
PL
AY BACK(2) LEFT
12,16
COMMON LEFT
SW10 SPEAKER SWITCHES
1,6
OFF RIGHT
2,7
A RIGHT
3,3
B RIGHT
4,9
A+B
RIGHT
5,10
COMMON RIGHT
11,16
OFF
LEFT
12,17
A LEFT
13,8 B
LEFT
14,19
A+B
LEFT
15,20
COMMON LEFT
SW2
TAPE DUBBING SWITCHES
1,5
A— 8 RIGHT
2,6
OFF
RIGHT
3,7
B—A RIGHT
4
,8
COMMON RIGHT
9,13
A - B LEFT
10,14
OFF
LEFT
11,15
B-A LEFT
12,16
COMMON LEFT
MODEL MC7051 - SCHEMATIC
50
To Next Page
Loading...
