Kenwood TL 922 Service Manual

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KENWOOD

SERVICE MANUAL

TL-922

LINEAR AMPLIFIER

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CONTENTS

SECTION 1 . IMPORTANT NOTICE ..................... . ........................................ 3
SECTION 2.1 TECHNICAL SPECIFICATIONS ............................................... 3
SECTION 2.2 TUBE SPECIFICATIONS. 4
SECTION 3. FEATURES. 4
SECTION 4. CIRCUIT DESCRIPTION .. 5
SECTION 5. VIEWS
External View ........................................................................ 8
Intemal View ........................................................................... 9
SECTION 6. PRINTED CIRCUIT BOARDS
Rectifier Uriit (X43-1280-10) . . 1 0
Meter Unit(X54-1300-10).... 10
SECTION 7. PARTS LIST .............................................................................. 1 1
SECTION 8. PACKING .................................................................................. 13
SECTION 9. DISASSEMBLV AND ADJUSTMENT NOTES ............................ 14
SECTION 10. DISASSEMBLY ....................................................................... 1 5
SECTION 1 1. LINE VOLTAGE CHANGE... .. 20
SECTION 12. TROUBLESHOOTING . 21
SECTION 13. ADJUSTMENTS ............ 22
SECTION 14. REFERENCE DATA [EXAMPLE]. ............................................... 24
. SECTION 15. SCHEMATIC DIAGRAM [W Type]...: ....................................... 27
SCHEMATIC DIAGRAM [K Type] ........................ Attached sheet
ILLUSTRATIONS:
Fig. 1 Linear Power Amplifier and Mode Switching Circuit .......................... 5
Fig. 2 Fan Motor Delay Stop Circuit ........... . 6
Fig. 3 Meter Drive Circuit 5
Fig. 4 Transformer Thermal Protection Circuit .. 7
Fig. 5 Chassis and Front Panel. .. 15

Fig. 6 Subpanel ...................... .. 16
Fig. 7 Rear Panel ................. .. 16
Fig. 8 Electrolytic Assembly. 17
Fig. 9 Relay and Meter Mountings . .. 17

Fig. 10 Disassembly Power Transformer ............ .. 18
Fig. 11 Dieassembly Filament Transformer ........ .. 18
Fig. 1 2a Disassembly Plate Variable Capacitor ..... .. 19
Fig. 12b Output Coupling Capacitor
Fig. 13 Rectilying Unit .................

Fig. 14a Input Voltage Terminal Boards [K TypeL
Fig. 14b Input Voltage Terminal Boards [W Type].
Fig. 15 Equipment Connection.

Fig. 16 Coil Locations .....
VIEWS:
Tube Basing ..... 3
Front and Rear. 8
Inside Top and Bottom ..................................................................................... 9
Printed circuit Boards
Rectifier Unit ................................................................................................. 10
Meter Unit... .. 10

Packing ......