Sansui 7070 Service Manual

Page 2

This service manual is designed for service engineers to repair, adjust,

maintain and order the replacement parts of the 7070 correctly.

When ordering the parts, use the stock number and parts name speci-
fically referring to the Parts Location and Parts Lists.

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

TABLE OF CONTENTS

Section Ti_t/e BE
1. SPECIFICATIONS .............................................. 2
2. ADJUSTMENTS ................................................ 3

21. Driver Circuit Board Adjustment .............................. 3
2-2. Power Meter Adjustment ...............
2-3. FM & MPX Adjustment .................................... 4. 5
2-4. AM IF Adjustment & Tracking ............................... 6
3. THREADING 0F DIAL CORD ..... . 7
3-1. Threading of Dial Cord ...................................... 7
3-2. Attachment of Dial Pointer .................................. 7
4. PARTS LOCATION & PARTS LIST ................. ..., 8
4-1. F-2625 Power Supply Circuit Board (Mother Board) ............. 8
4-2. F-2627 Illumination Circuit Board ........................... 8
4-3. F-Z626 Power Supply Circuit Board ............... .... 9
4-4. F-2624 Driver Circuit Board .................................. 9
4-5. F-2623 Filter Circuit Board .................................... 9
4-6. F-2620 Equalizer & Mic Circuit Board . .. 10
4-7 F-2615 FM Muting Circuit Board ............................ 10
4-8. F-262I Accessory Switch Circuit Board 10
4-9. F-2614 Tuner Circuit Board .............................. a. 11
4-10. F<2622 Tone Control Circuit Board .......................... 12
4-11. Figures .................................................... 12
0 COMMON PARTS LIST FOR RESISTORS
& CAPACITORS ONLY .................................. (Attached)
5. OPERATION BLOCK DIAGRAM ................................ 13
5-1, Power AMP. & Protector Section Block Diagram .............. 13
52. Tuner Section Block Diagram .....
5-3. PLL Block Diagram (1C HA1196) .......................... ..
5-4. FM IF System Block Diagram (IC HAI137W) .................. 14
6. SCHEMATIC DIAGRAM .................................... 15. 16
7. OTHER PARTS ...................
7-I. Top Side ............................................. . 17
7-2. Bottom Side .............................................
7-3. Exploded View .............
8. PACKING LIST ........................................ BACK COVER
9. ACCESSORY PARTS LIST ............................ BACK COVER