Sansui 661 Service Manual

Page 2

3 (ULSILL

661

This service manual is designed for service engineers to repair,

adjust, maintain and order the replacement parts of the 661 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

M32 19 E
1. SPECIFICATIONS ................................................ 2
2. BLOCK DIAGRAM AND LEVEL DIAGRAM . .. ............. 3

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

2~2. Level Diagram ...................... 4

3. THREADING OF DIAL CORD .................................... 5
4. ALIGNMENTS AND ADJUSTMENTS ............................ 6
4-1. Driver Circuit Board Adjustment ............................ 6

4-2. FM IF Alignment ............................................ 7
4-3. FM Dial Calibration and RF Alignment .................... 7, 8
4-4. FM Signal Meter, Mono Distortion and Muting Adjustment .... 8

4- -5. MPX Alignment ............................................ 9

4- -.6 AM IF, Dial Calibration RF and Signal Meter Alignment . 9, 10

5. TROUBLESHOOTING CHART .................................. 11
5-1. Troubleshooting on Power Supply Section .................. 11

5-2. Troubleshooting on Audio Section .......................... 11

5-3. Troubleshooting on Tuner Section .... .. 11. 12

6. PARTS LOCATIONS AND PARTS LIST . . . ...... 13
6-1. F4501 Pre Amplifier Circuit Board .... 13, 14
6-2. F-1491A Tuner Circuit Board ........................ 15, 16, 17

6-3. F~1499A Driver Circuit Board .......................... 18, 19

6-4. F-1500A Power Circuit Board ............................ 19, 20

6-5. Other Parts (Front Side) ............................... 21, 22

6- 6. Other Parts (Top Side) ................ 23

6- 7. Other Parts (Bottom Side) ................. . 23

7. SCHEMATIC DIAGRAM 0F TUNER SECTION . . 24
8. SCHEMATIC DIAGRAM OF AUDIO SECTION . . 25
9. PACKING LIST ............................. , 26
10. ACCESSORY PARTS LIST. 26
11. MAINTENANCE ........... 25

11-1.

Voltage Adjustment 26