Akai GX 220 Service Manual

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AKAI TAPE RECORDER

MODEL (EX-220

ALSO LLLLLLLLLLLLLLLLL (EX-220D

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TAB LE OF CONTENTS

SPECIFICATIONS .............................. 2
MEASURING METHOD .......................... 3
CONTROL LOCATIONS .......................... 4
DISMANTLING OF TAPE TRANSPORT UNIT &

AMPLIFIERS ................................... 5
TRANSPORT MECHANISM ....................... 7
MECHANISM ADJUSTMENT ...................... II
AMPLIFIER ADJUSTMENT ...................... 14
MAINTENANCE PROCEDURES .................... 16
COMPOSITE VIEWS OF COMPONENTS ............. 17
TROUBLE SHOOTING CHART .................... 22

SCHEMATIC DIAGRAM

When placing order for parts, please use Separate
PARTS LIST or PRICE LIST FOR PARTS.

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3. REVERSE (BLOCK DIAGRAM
ILLUSTRATION)

During Playback mode, when Reverse button (B) is
depressed or the sensing tape passes the sensing pole
($1), the base of TR0202 is grounded. The operation of
TRO202 is stopped and the voltage sent to the base of
TR0203 and operates it. Reverse Relay RL0201 is
actuated and Reverse is effected,

At the same time, the discharge current of Condenser
C0205 (100 M/16 V) actuates TRO4OI and TR104
which assume operating position within a period of from
4 to 8 seconds.

Tension Relay (RL0401) is actuated and a higher voltage
than during reverse playback time (47 V) is supplied to
the Take-Up torque motor. At the same time Mute
Relay (CRL1017) mutes the playback output signal.
Plunger (SR0301) operates and lowers the playback
head, (See Fig. 5-4)

FAST- FORWARD/REWlND

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VIII. MAINTENANCE PROCEDURE

1. LUBRICATION INSTRUCTION CAUTION : DO NOT OVER-LUBRICATE. WIPE OFF
EXCESS OIL WITH A COTTON SWAB SOAKED
IN ALCOHOL, OTHERWISE, THE EXCESS
LUBRICANT MAY BE SCATTERED DURING

For maximum service life and optimum performance,
lubricate the parts identified below after each 500 hours
of operation. Use only light machine Oil of good quality.

Motor OPERATION AND THE RUBBER COMPONENT
PARTS WILL DETERIORATE.

Flywheel Assembly

Pinch Wheel r ......... 1 drop
Also apply a liberal film of light machine grease to each
roller surface of all levers and cams.

2. CLEANING TAPE HEADS AND
OTHER PARTS

Wipe surface of tape heads, guide roller bearing, capstan
bushing and pinch wheel periodically with a soft cloth
soaked in alcohol.

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