Table Of Contents; Service Procedures - Onkyo DX-7500 Service Manual

DX-7500
TABLE OF CONTENTS
Specifications ......... cece cece ete ce ee ee eee e eens ee eeeee enna ens 1
Service PrOCEdUres 2.0... eee e eee ee eee cece eee eee nent neeees 2
Note on compact disc ....... ec ccc cece ccc e eee tenet trae ees 3
Protection of eyes from laser beam during servicing .. 4
Laser warning label .............. 0.0... cece eee e eee eee eee eee 4
Caution on replacement of pickup ................00eseeeee 6
Packing VICW ....... 0c cece cece eee eee nee n eee ee 7
Chassis-exploded View ...............ecceceee ence ee eee n ees 8
Parts Vist .........cc ccc ccce cece rere eee eee rete eeeeeeenen ene eeee ene ees 9
Mechanism-exploded View ..........cc cece eceseeeee renee ens 10
eV oa |) 11
Disassembling procedures ..............ecc cece eee ee eee e ee ees 11
Lubrication 2.00... ...c cece eee eee e see eee net e eee e ene e nee ene eens 12
IC block diagram and descriptions ........-.-..-.:-.-+0- 13
Adjustment procedures ..............c cece cece ee ene eee ene ees 22
Printed circuit board view from bottom side
Main CIPCUlt 20.0.0... eee c cence cece eee tence eee e cnet ees 25
Other pec boards 2.0.0.0... cee cece reese eee e eee ees 29
Printed circuit board-parts list ...............c elec eee 27
Block diagram ...............cce cece cece een eee een eee ee ene 3]
SERVICE PROCEDURES
1. How to Release the Transport Lock
£6 phbtcct she optical assembly including the laser pickup
frirtvitratlon 'related damage during shipping, this unit
tit equipped with a transport lock lever located on the base.
Ge
e Use a screwdriver to turn the lock lever (about 90°) in
the round hole in the direction of arrow ( @ ).
@ Before transporting the unit again, stand it with its left
side facing down, and turn on the power. Wait 2-3
seconds and then turn the lock lever in the opposite
direction of the arrow.
Fig. 1
2. Safety-check out
more.
Form of soldering iron's tip:
2. Work Procedures:
(1) Remove the defective IC
Cut all leads of the defective IC one by one using
a nipper and remove the IC.
IC = iC < ; IC <<
(Inclining)
(Twisting)
Fig. 3
(Rising)
(4) Apply flux to the PC board.
About 2.5 mm
Fig. 4