Sansui TU 7900 Service Manual

Page 2

This service manual is designed for service engineers to repair, adjust,
maintain and order the replacement parts of the TU-79OO correctly,
When ordering the parts, use the stock number and parts name specific-
ally referring to the Parts Locations 8: Parts Lists.

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

TABLE OF CONTENTS

Suction Title 3215.9
1. SPECIFICATIONS ............... . ............... . ................. 2
2. ADJUSTMENT ................... . ............ . .......... .... ....... 2

2-1. FM Adjustment 8t Alignment .................................. 3. 4
2-2. AM IF Adjustments 8: Tracking ............................... 4. 5
3. THREADING OF DIAL CORD ....................... . ................ 6
SH. Threading of Dial Cord ................................... . ...... 6
3-2. Attachment of Dial Pointer .... ............ . ..................... 6
4. OPERATION BLOCK DIAGRAM ........................ V ........... 7
4-1. FM, AM Tuner Block Diagram .................................... 7
4-2. PLL Block Diagram (IC HA1196) .............. . ................... 7
5. TROUBLESHOOTING CHART ...................................... 8
6. PARTS LOCATION 8. PARTS LIST .................................. 9
61. F-2549 FM, AM Tuner Circuit Board ......... .. .................... 9
6-2, F-2550 Multi-path Circuit Board ................ _ ............... 10
6-3. F-1511 Power Supply Circuit Board .............................. 10
6-4. F1 519 FM Pack ................................................ 10
65. Figures of Semiconductors .................................... 11
6-6. Other parts ................................................. 12
7. SCHEMATIC DIAGRAM .......................................... 13
8. PACKING LIST ................................................... l4

9. ACCESSORY PARTS LIST ........................................ 14