Garrard SP 25 Mk3 Service Manual

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Service manual
for

Garrard Model SP25 Mklll

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Model SP25 Mk III Module SP25 Mk III

Single record playing unit

(Also other models in the Garrard Autoslim mechanism range, including Model SP25 Mk IV)

Garrard
Sales Service Department
Kembrey Street

Swindon Wiltshire England
Telephone: Swindon (0793) 6211
Telex: 44180

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contents

General information
Installation

Wiring

Fitting pickup cartridge
Installation adjustments
Operating instructions
Maintenance

Exploded view and spare parts list 10 11
Service adjustments 12
Dismantling 13
Fault charts 14

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diagrams

Fitting counterbalance weight diagram 1
Transit screw positions diagram 2
Parking peg assembly diagram 3
Voltage changeover block connections diagram 4
Pickup tag strip connections diagram 5
Phono socket connect-ions diagram 6
Pickup cartridge connections diagram 7
Stylus force dial and bias compensator diagram 8
SP25 Mk III, general view diagram 9
Turntable clip removal diagram 10
SP25 Mk III, turntable removed diagram 11
SP25 Mk III, underside view diagram 12
Pickup arm adjustments diagram 13
Intermediate wheel height adjustments diagram 14
Plug-in motor connections diagram 15
Pickup arm overload spring location diagram 16
Switch off lever and selector mechanism diagram 17
Selector actuating lever location diagram 18
Lead clamps diagram 19
Friction I-ink diagram 20
Pickup lifting mechanism diagram 21

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general information

The Garrard SP25 Mk III continues the line of models in
which a proven record playing mechanism has been
adapted to the specialized requirements of a single record
playing unit. To this end a number of refinements and
features are included in this model, all of which add to the
appeal which has made the SP25 Series the most popular
choice in its class.

Notably, an improved damped cueing system is incorpor-
ated and as an alternative to cueing, automatic play of a
single record is now possible. Standard manual play and
Reject facility are of course, still featured. Other refine-
ments include a fully adjustable pickup arm bias com-
pensator and the versatile Garrard Type C2 slide-in
cartridge carrier which facilitates the inspection and
replacement of stylus or cartridge. The tubular aluminium
pickup arm with its precision ball bearing pivots, resiliently
mounted counterbalance weight and calibrated stylus
force dial, remains characteristic of this series of units
and the SP25 Mk lll is powered by a Garrard motor of well
tried reliability.

Special attention has been paid to the relationship
between the turntable and pickup arm, so that the vertical
tracking geometry for the majority of pickup cartridges is
correct when playing the single record. After playing a
record, the pickup lifts, returns to its rest and the unit
switches off automatically.

Model SP25 Mk III is normally supplied as a combined
high and low voltage range unit, which will run on either
110/125V or 220/240V AC according to the setting of the
links in the changeover block. The unit will run on 50Hz
or 60Hz frequency, according to the type of motor pulley
fitted.

The unit plays any record up to 12in diameter at three
standard Speeds of 33% rev/min, 45 rev/min or 78 rev/min.

1

Before connecting the unit, make sure that the power
supply is of the range to which the motor is set. If the
pickup circuit of the unit is connected to an amplifier
whose wiring is not isolated from the power supply, isolat-
ing components must be incorporated in the pickup
circuit, otherwise the pickup circuit can become live.
Always disconnect the power supply and protect the
stylus before servicing a unit.

Garrard record playing equipment is made to play records
complying with 8.8.1928/1965 and |.E.C. Publication 98,
also other similar standards.

If you require spare parts, please quote the code number
for the Garrard unit, unless a full description can be given.
The code number for Model SP25 Mk Ill is 74750 plus its
following three figure stroke number overstamped on its
inspection label attached to the underside of the unit.

Module version

Besides being marketed as a deck only this series of units
is also supplied in module form, complete with module
base, hinged lift-off moulded cover and connecting leads.
The module form is usually supplied for one voltage range
only with a three-core or two-core mains lead already
connected. A phono lead with a five pin DIN plug is
normally fitted and the module may be supplied with or
without pickup cartridge.

Later units in this series

Model SP25 Mk lll is developed from the well-known
Garrard Autoslim' mechanism and this service manual
provides much of the information which may be of use with
both earlier and later models in this series. E'Xploded view
and parts lists supplements for such models may be used
with this manual. Note that the SP25 Mk IV is similar to the
Mk III, but has restyled decor and pickup head, plug-in
Synchro-Lab motor, also new turntable spindle and main
bearings, and close-fit motor pulley. Model 3588 is belt-
drive development from this mechanism. The exploded
view supplement for Model 3588 includes information on
the mechanism differences for this latter model.