Jvc JL B44 Service Manual

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MOTOR AND TURNTABLE
Motor:

Drive System:

Speeds:

Variable Speed Range:

Wow & Flutter:
Signal-to-Noise Ratio:

Platter:

TONEARM
Type:

Effective Arm Length:
Tracking l'irror:

Overhang:

Stylus Pressure Range:

Usable Cartridge Weight Range:
Adjustable Arm Height Range:

No. 2335

SERVICE MANUAL

MODEL JL-B44

DIRECT DRIVE TURNTABLE

8-pole 24-slot DC servo-controlled motor
Direct-drive system

33-1/3 and 45 rpm

Within 3.0% (both for 33-1/3 and 45 rpm)
Less than 0.05% (WRMS)

Better than 60dB

31cm-diameter die-cast aluminum alloy
(Weight: 1.6 kg)

Statically~balanced S-shaped tubular arm
with JVC-developed TH balancing system
245mm

Less than 11°30'

15mm

0 to 3 grams (Steps by 0.1 gram)

12 to 32 grams (Including Head Shell)

43 to 52mm

SPECIFICATIONS lllllllllllllllllllHlllllIlllllIlllllIllllllllllll|llllllllllllllllllllllllIllllllllllllll

FEATURES
Anti-skating. arm lifter. cue lever strobosc0pe, low-capacity
output signal cable. etc.

BASE

Type: 41-p1y beechwood laminate

Adjustable Base Height Range: 10mm

Dust Cover: Smoked acryl plastic

GENERAL

Power Source: AC 120V 60Hz only (U.S.A. & Canada)
(AC 220V 50Hz only
(Switzerland & Scandinavian)
AC 240V 50Hz only (Australia & U.1(.)
AC 100, 120. 220 or 240V (Selectable)
50/60Hz '

Power Consumption: 5W (SOHz), 4.5W (60Hz)

dimensions: Height x Width x Depth =
7-1/2 x 19-3/8 x 16-1/4 inches or
19 x 49 x 41 cm

Weight: 28.6 lbs or 13 kg (net)

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TONEARM ADJUSTMENT
ADJUSTING STYLUS PRESSURE (Fig. 1)

1.

Remove the arm from its res_t, being careful not to damage the stylus tip. If the anti-skating weight is
removed from its holder the tonearm will not tend to move towards the center of the record and it will
be easier to adjust to zero balance.

Turn the main weight in either direction to achieve zero balance; this is when the tonearm is balanced
with the stylus tip at the level of the record surface.

Put the arm back on its rest and clamp it in place.

Hold the main weight so that it does not move and turn the scale ring so that its 0 mark is aligned
with the index line on the weight shaft. If the main weight is allowed to move at this time the correct
stylus pressure will not be obtained.

Turn the main weight clockwise (this moves it forward) being careful not to touch the scale ring. The
scale ring turns with the main weight; match the stylus pressure required with the index line on the weight
shaft. Fig. 3 shows the setting for a stylus pressure of 2 g.

Stylus Pressure Dual Cap

Main WEIth

[moves backwards or
forward when turned)

Index Line

.
Main Weight Sh I

Fig. l

ANTI-SKATI NG ADJUSTMENT (Fig. 2)

l.

The anti-skating device must be adjusted according to the stylus pressure of the cartridge being used.
Attach the loop on the string attached to the anti-skating weight to one of the grooves in the anti-skating

bar as shown in Fig. 3.
The anti-skating bar has three grooves; the inner one is for a stylus pressure of 1.5 g and the center one

is for a stylus pressure of 2.0 g.
If you are using a cartridge which requires a stylus pressure of less than 1.5 3, remove the anti-skating

weight.

Index Line

1.5 gr. Stylus Pressure
20 gr. Stylus Presswe

25 gr. Stylus Pressure

Ami-skating Lever

Anti-skating Weight

Anti-skating Bar Fig 2

JL-B44 (No. 2335) -2-