Philips n 4307 service manual

Page 1

PHILIPS

PHILIPS Model N4307

General Description: This model is basically similar to the Stella Model
ST9123A which is described later in this volume. It has a simplified input
stage with a single input/output socket and TI is omitted, the signal being
applied direct to the base of T2 through the blocking capacitor.

PHILIPS Model N4308

General Description: This model is electrically similar to the Stella
Model ST9123A which is described later in this volume.

r-nr Ron/in: Manuals Contact
MAURIT RON TECHNICAL SERVICES
8 Cherry Tree Rd, Chinnor

P" I L I PS Tolz- omfaétigsgiagxfahmszssa M 0d el L F 00 8 5

Email:~enquiries@mauri1ron.oo.uk

General Description: The LFHooS 5 Pocket Memo is a miniaturised,
battery operated, cassette loaded, dictation machine. It is completely self
contained; the battery, micro-cassette and combined microphone/loudspeaker
all being housed within the pocket sized casing. A socket is provided for the
use of stethoscope headphones, if desired in lieu of the internal loudspeaker.
Provision is also made for the re-recording of recorded matter on to a Philips
EL3 581, EL3582 or LFH0084 dictation machine by means of an inter-con-
necting dubbing (copying) lead.

Battery: 9volt (PP3 or equivalent), at 3 5mA approx.

Battery Check: The battery should be checked periodically to see if it still
provides sufficient voltage. To do this, depress the top of the side rocker
switch and press the battery check control (above volume control). If an
audible tone is heard from the loudspeaker the battery is still good.

Dismantling

Case Removal: Remove battery and tape cassette. Withdraw plastic cap
from headphone socket. Remove screws from back and top. Lay machine
face down, depress record button then lift off the rear casing. Ease internal
assembly upwards, free from front casing. Remove safety button and foam
rubber damping pad for safe keeping. Reassemble in the reverse order.
Ensure that battery leads are positioned to lie in the slots provided.

Removal of Printed Panel: Set record button and rocker switch to the
rest position or to the position required for test. Note (or mark) position of
motor switch (S1) slider for future reference, then slacken off screw securing
actuator bracket and disengage bracket from slider. Free lead to headphone

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