Sansui 8 Service Manual

Page 2

EIGHT-DELUXE

This service manual is designed for service engineers to repair,

adjust, maintain and order the replacement parts of the EIGHT-DELUXE
correctly.

When ordering the parts, use the stock number and parts name speci-
fically referring to the Parts Locations & Parts List.

For general usage and maintenance of the unit, please refer to the
Operating Instructions attached with the unit.

TABLE OF CONTENTS

Section Title Page
1. SPECIFICATIONS .............................................. 2
2. BLOCK DIAGRAM AND LEVEL DIAGRAM 3

2-1. Block Diagram ............................ 3

2-2. Level Diagram ............................ 4

3. ALIGNMENTS AND ADJUSTMENTS .......... 5

3-1. Driver Circuit Board Adjustment .............. 5

3-2. FM IF Alignment ........................................ 5. 6

3-3. FM Dial Calibration and RF Alignment ...................... 6
3-4. FM Signal Meter, Mono Distortion, Tune Meter and Muting

Adjustment .............................................. 7

3-5. MPX Alignment .......................................... 7, 8

3-6. AM IF Dial Calibration, RF and Signal Meter Alignment ...... 9

4. THREADING 0F DIAL CORD .................................. 11

5. TROUBLESHOOTING CHART ....................... 12

5-1. Troubleshooting on Power Supply Section N ........ 12

5-2. Troubleshooting on Audio Section ......... .12, 13, 14

5-3. Troubleshooting on RF Section ................. ...14, 15

6. PARTS LOCATIONS AND PARTS LIST ................. 16

6-1. F-1419A FM IF Circuit Board ..................... ...16, 17

6-2. F-1261C FM MPX Circuit Board ..................... ..18, 19

6-3. F-1417D AM Circuit Board .................. .20, 21

6-4. F-1472 Equalizer Circuit Board .. 21, 22

6-5. Special Parts List in FM Frontend ....... . . ....... 22

6-6. F-1476 Accessory Switch Circuit Board ...................... 22

6-7. F-1477 Accessory Switch Circuit Board ...................... 22

6-8. F-1473 Tone Control Circuit Board ............... 23

6-9. F-I474 Driver Circuit Board ............. 24, 25

6-10. F-1475 Protector Circuit Board ........ . . . . . . 25, 26

6-11. F-1201A Power Supply Circuit Board ........................ 26

6-12. Other Parts (Front Side) .................................... 27

6-12-1. Section-1 ............ .. .27. 28

6-12-2. Section-2 ....... H . . H ..... 29

6-13. Other Parts (Top Side) .. . ..... 30

6-14. Other Parts (Bottom Side) .............................. 30, 31

7. PACKING LIST ................................................ 31

8. ACCESSORY PARTS LIST ......... 31

9. MAINTENANCE .............................................. 31

9-1. Voltage Adjustment ........................................ 31

10. SCHEMATIC DIAGRAM 0F TUNER SECTION .................. 32

11. SCHEMATIC DIAGRAM OF AUDIO SECTION .................. 33

12. REPLACEMENT 0F MAIN PARTS ... 34

12-1. Tuner Section ............................................ 34

I)

Page 10

EIGHT-DELUXE

3-6. AM IF, Dial Calibration, RF and Signal Meter Alignment
(See Figs. 3- 5, 3-6 and 3-7 on page 10)

.AM GEN E_SCOPE

Note: 1. Selector ..........
. Master Volume ,. . .Minimum
. Confirm start point 0 ml pointer e are alignment.

. in case of using loop antenna, increase output of
AM SSG for 26dB than bar antennas input as it
attenuates input sensitivity for ZédB. (See Fig. 3-4)

5. Nonmetaric, plastic alignment tools should be used
for RF alignment.

Fig. 3-4
BAR ANT®

4x035.)

aJmoa ANT
605m""1VTVM SCOPE
AM SSG LOOP ANT UNIT /7l\
OUTO- TAPE IN OUT
REC _ _ V
0-- fi/ BOAR ANT 0 _Y~ _____ o G j; ____1 o
o- L-<> o- -o
FEED SIGNAL MEASURE
STEP sun ECT _ AD usr AD usr FOR CONDITION
FROM I TO OUTPUT l
1 IF coil Output 60dB OSC trimmer F-1417C T302 Max. IF wave- oBetter to adjust T304 at last for
Genescope cap. (TC303) terminal 30 T304 form Fig. 3-7 easiness
Fig. 3-6 Genescope T305
input T306
2 535kHz 545kHz Bar ANT REC OUT T303 Max. output elf broadcasting station is near,
Dial ANT input 60dB L or R-ch it might be used
Calibration 400Hz VTVM 8:
(30% MOD) Scope I...imi..,imi
AM SSG 5 5 liilll
Use ioop ANT
3 1400kHz 1400kHz Same as above Same as TC303 Same as above Same as above
Dial ANT input 60dB above
Calibration 400:2 OD) W
(30 M . xv. . .. ..
AM 556 we
Use loop ANT
4 Confirm Same as Step 2 Same as above Same as Confirm 535kHz olf not, repeat from Step 2
535kHz above Dial
Dial Calibration
Calibration
5 Confirm Same as Step 3 Same as above Same as Confirm olf not, repeat from Step 3
1400kHz above 1400kHz
Dial Dial
Calibration Calibration
6 600kHz 600kHz Same as above Same as L304 Max. output
RF Adj. ANT input 60dB above T301
400Hz
(30% MOD)
AM SSG
Use loop ANT
7 1400kHz Same as Step 3 Same as above Same as TC301 Same as above
RF Adj. above TC302
8 Signal 1000kHz Same as above Signal VR301 3.3 on meter oTune AM SSG (Max. indication
meter ANT input74dl3 Meter of signal meter)
400Hz l oBefore adjustment, if meter
(30% MOD) 0W. swang out or not enough pre-
AM SSG adjust VR301 until the reason-
Use loop ANT able point
9 6.5kHz 6,5kHz F-l417C REC OUT L303 Min. 6.5kHz
Trape coil Output 1V terminal 36 L or vah
(low pass Audio Osci. VTVM 8:
filter) Scope
1O 9.5kHz 9.5kHz Same as above Same as L302 Min. 9.5kHz
Trape coil Output 1V above
(low pass Audio Osci.
filter)

Page 40

7. PACKING LIST

Part: No. stock No. Description
I 902610] Stylofoam Pucklng
2 9026l0l Styloloam Packing
3 900736l Carton Case

8. ACCESSORY
PARTS LIST

Stock No. Description
9406020 Polishlng Cloth
0433250 5A Quick Acting Fuse
3820040 AM/FM ANT
9207550 Operating Instructions
9227550 Operutlng Instruction Sheet

9. MAINTENANCE

9-1. Voltage Adjustment

The Voltage Selector on the rear panel enables you to
operate at correct voltage in any areas. The voltage has
been preadjusted at the factory, but can be easily
changed as follows.

1) Remove the two screws securing the name plate on
the units rear panel, then remove the name plate.

2) Unplug the Voltage Selector plug once, and reset it
so that the arrow mark on it faces the correct voltage
indication. Also change the power fuse when the
power supply voltage has changed. For 100,117 volt

operation, use a S-am pere glass-tubed fuse. For 220/

240 volt operation, use a 3-ampere one.

Note: The Voltage Selector can be used to eliminate
the trouble caused by the considerable voltage
fluctuation. In this case, it should be set to the
peak voltage.

100V 240V
240V II7V 240V II7V
O O
220V IOOV 2 IOOV
'II 7V 220V

240V "7V 240V 117V
CE 9 69 :32 <9
220V IDOV 220V IOOV