Sansui 500A Service Manual
This is the 31 pages manual for Sansui 500A Service Manual.
Read or download the pdf for free.
If you want to contribute, please mail your pdfs to info@audioservicemanuals.com.
Extracted text from Sansui 500A Service Manual (Ocr-read)
Page 1
SERVICE MANUAL
AM/ FM MULTIPLEX STEREO TUNER AMPLIFIER
SANSUI ELECTRIC COMPANY LIMITED
Page 2
CONTENTS
TROUBLESHOOTING AUDIO SYSTEM ........ 3, 4,
AMPLIFIER TROUBLESHOOTING CHART... 5,6,7, 8,9, 10,11.12,13
REMOVING THE FRONT PANEL
BONNET & BOTTOM PLATE ................ 14
DIAL MECHANISM ...................................... 14
SCHEMATIC DIAGRAM ................................ 15,16
BLOCK DIAGRAM ........................................ 17
PARTS LAYOUT .......................................... 17
PRINTED CIRCUIT SHEETS ........................ 19
SELECTOR CHART ...................................... 20
CHASSIS DIAGRAM ...................................... 21
ALIGNMENT ................................................ 22, 23, 24
PARTS LIST .................................................. 25, 26, 27, 28, 29
COLOR CODE ................................................ 3O
Page 12
Symptom
Probable Cause
Check Point
(Continued)
7. Divergence in adjustment
Optimum adjustment often needs to
of: ' use measuring instruments.
a. Tracking. TC4, TCS
b. I.F.T. T301. T302
Distortion . Defective overall See Distortion over all program
section sources.
. Defective AM section . Divergence of voltage Measure voltage in AM section and
specified in CIRCUIT replace defective element.
DIAGRAM"
. Detector diode, aging or D301
weak
. Insufficient capacity of C305, C306
capacitor
. Divergence in adjustment See Weak sound.
I-Ium . Defective overall See Hum over all program sources
section
. Defective AM section . Inner contact or poor V4, V6
insulation of tube.
. Insufficient capacity of C305, Co
I capacitor.
Noisy i . Amplifier is OK. See- TROUBLESHOOUING AUDIO
SYSTEM WHEN THE AMPLIFIER
IS GOOD".
. Defective
overall
section
SeeNois over all ro ram sources.
y P 8
. Defective AM section
. Aging or defective tube.
2. Loose contact of rotary
switch.
V4
52a, 52b
Tuning meter
does not work
normally.
. Defective AM tuner
Check as described above.
. Defective tuning indicator circuit
See FM RECEPTION: Tuning meter
does not work normally.
USE OF RECORD PLAYER (MAGNETIC), TAPE DECK
' Symptom
Probable Cause
Check Point
No sound
. Program source de-
Check and repair or replace.
resistor.
fective
. Defective overall See No sound over all program
section sources".
. Divergenceof voltage . Divergence of voltage Measure voltage in head amplifier
specified in CIRCUIT section and replace defective element.
DIAGRAM
. Defective capacitor 01' 0507, C517, R510, R324, C505, C315