Checking Of The Main P.c; Measurements And Adjustments - Technics SL-PS740A Service Manual

SL-PS740A ;
m@ CHECKING OF THE MAIN P.C.B.
1. Remove the cabinet (see Ref. No. 1 of the disassembly
instructions). Main P.C.B. Lead wire
2. Remove the front panel ass'y (see Ref. No. 2 of the
same).
4. Remove the main P.C.B. (see Ref. No. 9 of the same).
5. Don't remove the 7 connectors (CN11, CN12, CN13,
CN401, CN415, CN431, CN871).
6. Connect the main P.C.B. ground terminal (LINE OUT
terminal) to the rear panel ass'y with a lead wire.
Ground terminal
(LINE OUT) —
When checking the soldered surface of the main P.C.B.
and replacing the parts, do as shown below.
Box or stand to make operation
P.C.B. stand.
Operation P.C.B.
m@ MEASUREMENTS AND ADJUSTMENTS
Caution:
1. It is very dangerous to look at or touch the laser beam. (Laser radiation is invisible.)
With the unit turned "on", laser radiation is emitted from the pickup lens.
Avoid exposure to the laser beam, especially when performing adjustments.
2. During laser power or focus offset adjustment, never connect the other probe to the unit.
(Otherwise the unit's power supply will sustain damage.)
Oscilloscope
PREPARATION
. Remove the disc holder (see Ref No. 7 of the same).
. Place the test disc on the turntable.
. Turn "ON" the power switch at the player.
again. 3S =.
Tray SW (S1001)
MO & Wh
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