TUNER BOARD
TABLE OF CONTENTS
Tuner Adjustment Table .................................................................. 7-1
Circuit Diagram ............................................................................... 7-2
PCB Layout ..................................................................................... 7-3
Electrical Parts List & Voltage List ................................................. 7-4
9-1
9-1
TUNER ADJUSTMENT TABLE
Waverange
Input frequency
Input
Tuned to
Adjust
Output
Scope/Voltmeter
VARICAP ALIGNMENT
108MHz
87.5MHz
check
7.5V 1V
1.4V 0.2V
FM
87.5 - 108MHz
(50kHz grid)
1602KHz
531KHz
T005
FM
1)
If sensitivity of frequency counter is too low adjust to max. channel separation
(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)
2)
RC network serves for damping the IF-filter while
adjusting the other one.
3)
For AM RF adjustments the original frame antenna has to be used!
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
FM - RF
7.2V 1V
108MHz
87.5MHz
MAX
mod=1kHz
f= 22.5kHz
106MHz
90.1MHz
check
check
VC001
L001
MAX
1700KHz
531KHz
check
T005
1.1V 0.2V
7.2V 1V
1.1V 0.2V
Summary of Contents for MCD139/All versions
Page 2: ...1 2 TUNER KEY PCB CONTROL PCB MAIN PCB AMP PCB POWER PCB Left speaker LOCATION OF PCBS ...
Page 18: ...4 2 WIRING DIAGRAM 4 2 ...
Page 28: ...CIRCUIT DIAGRAM BOTTOM LEFT 6 4 6 4 ...
Page 29: ...6 5 6 5 CIRCUIT DIAGRAM BOTTOM RIGHT ...
Page 47: ...10 1 10 1 EXPLODED DRAWING MAIN UNIT ...
