Sansui P-L50 - Page 9

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"4. ADJUSTMENTS
Note: Before adjustments of 4-1 and 4-2, remove the arm rest only.
4-1. Adjustment of Automatic Disk Size Selection
Operation (See Figs. 4-1, and 4-4)
1) By using 30 cm size record, actually carry out the automatic disk
size operation (lead-in operation). Adjust the lead-in adjusting
cam (See Fig. 4-4), so that the stylus tip may come down to the
position (the lead-in groove position) 146 mm away from ine
_ disk center (See Fig. 4-1).
2) By using 17 cm size record, actually carry out the automatic ‘disk
size operation (lead-in Seen Confirm that the stylus tip
may come down to the lead-in groove position. |
Fig. 4-1
Cartridge
_Disc
Leen ie
4-2. Adjustment of Automatic Music Selection
Operation (See Figs. 4-2, 4-3 and 4-4)
@ Required disc and measuring instruments
1) Tester (DC voltmeter) 7
Input impedance: 50kohm/V or more. (The higher, the better)
2) A vinyl! chloride record disc without grooves or with wider lead-
out spiral than usual.
3) A rule with graduation marks starting from the edge.
A. Tone Arm Height Adjustment
Adjust the height as shown in Fig. 4-2, by rotating the tone arm
height adjusting screw (See Fig. 4-4) (Stop the see at a | position
about 130 mm away from the disk center.)
Fig. 4-4
Make two(2} turns
around this
Drive Wire
f P-L50/L40
Fig. 4-2
Disc without grooves
‘Disc with grooves —
Lead-out spiral
B. Sensitivity adjustment of E sensor (p. L50)
1. Setting
At the lifter-up position, in case of a record disc without grooves,
stop the stylus at a position about 10 cm away from the disc
center. In case of a record disc having. grooves, stop the stylus
lead-out spira.
: How to adjust (See Fig. 4-3, Top View on Page 14).
a) Connect the DC voltmeter across the test terminal E and G
(ground) and then adjust the voltage to DC 2.5 V by rotating the
volume (fVR1) <E sensor adjustment> |
b) Move the tone arm downward. (Check that the stylus staysona
lead-out spiral.) |
c) Connect the DC voltmeter across test terminal F and G (ground)
and then adjust the voltage to DC 2.5 V by rotating the volume
(fVR2) <F sensor adjustment>
Fig. 4-3
Test Terminal
fs yon
E FArm G
Servo
crewsA
Tone Arm Height
Adjusting Screw.
Lead-in
‘Adjusting Cam
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