Sansui P-M7 - Adjustment Procedures; Automatic Disc Size and Music Selection Adjustments; Tone Arm Height and Sensor Adjustments

3. ADJUSTMENTS
Note: Before adjustments of 3-1 and 3-2, remove the arm rest only.
3-1. Adjustment of Automatic Disk Size
Selection Operation (See Figs. 3-1, 3-3 and 3-4)
1) By using 30cm size record, actually carry out the automatic disk
size operation (lead-in operation). Adjust the lead-in adjusting
cam (See Fig. 3-4) by the tone arm placed on the arm rest (the
Position @ as shown in Fig. 3-3 so that the stylus tip may
come down to the position (the lead-in groove position) 146 mm
away from the disk center (See Fig. 3-1).
By using 17cm size record, actually carry out the automatic disk
size operation (lead-in operation). Confirm that the stylus tip
may come down to the lead-in groove position.
i)
—
Fig. 3-1 Cartridge
wer Disc
Pea es 46mm
3-2. Adjustment of Automatic Music Selection
Operation (See Figs. 3-2, 3-3 and 3-4)
@ Required disc and measuring instruments
1) Tester (DC voltmeter)
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) Arule with graduation marks starting from the edge.
A. Tone Arm Height Adjustment
Adjust the stylus and disk as shown in Fig. 3-2, by rotating the tone
arm height adjusting screw (See Fig. 3-4) to the position @) as
shown in Fig. 3-3. (Stop the stylus at a position about 130 mm away
from the disk center.)
Fig. 3-2
wi Disc without grooves
Disc with grooves
! eceereyeUuN
| Lead-out groove
Fig. 3-4
Tension Adjusting
Screw
Make two(2) turns:
around this
P-M7
B. Sensitivity adjustment of E and F sensor
1. Setting
At the tone arm 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 above the flat surface nears 10 cm away from the disc
center.
2. How to adjust (See Fig. 3-3, Top View on Page 8)
a) Connect the DC voltmeter across the test terminal E and G
(ground) and then adjust the voltage to DC 1V by rotating the
volume (fVR1) <E sensor adjustment>
Connect the DC voltmeter across the test terminal F and G
(ground) and then adjust the voltage to DC 1V by rotating the
volume (fVR2) <F sensor adjustment>
Note: When adjusting both the sensors with the stylus stopped on a
lead-over groove of an ordinary record disc, note that there is
a difference in detection position between E sensor (leading
sensor) and F sensor.
b
—
C. Level adjustment of F2 signal
1. Setting
Set the stylus in the same way as described under Section 2, and
then move the tone arm downward. (Check that the stylus stays
ona lead-over groove.)
2. How to adjust (See Fig. 3-3, Top View on Page 8)
a) Connect the DC voltmeter across test terminal Fz and G (ground)
and then adjust the voltage to DC 1V by rotating the volume
(fVR3).
Fig. 3-3
Tone Arm Height
Adjusting Screw
Lead-In
Adjusting Screw
Test Terminal
Arm Servo Adjusting Cam
Sensor Holder
Fastening Bolt
‘Tone Arm Height
Adjusting Screw
Lead-In
Adjusting Cam