JVC QL-G90B Service Manual

QL-G90B
move. QL-G90B
Contents
Page
Safety Precautions ...........::cssseeeeeesseeeeenenerseeeeeteees 1- 1
1. Features
.......ccecececcscessveesenerenereneraserersenenerens 1- 2
2. Specifications .........c.s-sseeeerenerenenenereaeaeeeeeenens 1- 2
3. Controls and Functions ..........0.:cccseccesseeeeneneees 1- 3
4. Servicing Precautions ...........csseeseeeseeseentereneens 1- 5
5. Technical Explanation ............scseseeeersensesseeenes 1- 5
5-(1)
Programmed Music Scan ............00se:sceres 1- 5
5-(2)
Explanation of Microprocessor
Pins (MB88401M/292K) .........scereeeeeeees 1- 6
6. Stylus Replacement ............-seeeeesseceneeeerseeeenes 1- 8
G-(1)
Removal
........:cccsseceesseetenseesenerseeseeeeses 1- 8
G6-(2) Attachment ...........ccseceeseneeeeereesseneneeees 1- 8
7. Cartridge Replacement ..........:.:::ssseerecenneesenees 1- 8
8. Disassembly ..........:cc.ccsssceccseneetseneeenensceesenanes 1-9
8-(1)
Disassembly Procedure .............:ee:esereees 1-9
8-(2)
Removal and Attachment of Platter
Compartment Door ..........:c:sseeeeeeenenenees 1-10
9. Rope Suspension .........sscecsssssessssreceeeersesenenees 1-10
Page
10. Block Diagram .........:c..ccecesecsecseeeeeetereees
nana neon 1-11
11. Check of Power Supply P.C. Board ............0:2+05 1-11
12. Adjustment Procedures
..........::sssecesensseerenerens 1-12
12-(1)
Lead-In Adjustment ...........:ccscseeseeeetens
1-12
12-(2)
Offset Adjustment ...........::sceeceeeeeeeeen 1-12
12-(4) Detect Position (Touch-Down Position)
Adjustment ...........:ccccceeeeeeeeenneeeneeeees 1-12
13. Connection Diagram .............csceceeeeteeeseeeneee ener 1-13
14. Troubleshooting ........:.::ccccccssecsestseeeneeeeneeenen
1-14
14-(1) When Tonearm Action is Abnormal ...... 1-14
14-(2) When Turntable Operation is Abnormal .. 1-17
14-(3) When Nusic Scan Operation is
Abnormal ........:cccccccsserseneereneeeneeceotn 1-21
16. Power Cord Connections in Different Areas ...... 1-24
Parts List .......2-2::::ssenessseereees Separate-volume Insertion
No, 2717
Mar. 19 84((5