Akai GX 65 Service Manual

Page 1

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STEREO CASSETTE DECK

SPECIFICATIONS

mom GX-65

Track system ............ 4 track 2 channel stereo
Heads

Erase head ............ Xl

Recording head ,4 LC-OFC SGX X1

Playback head ......... LC-OFC SGX X1
Motors

Capstan drive ......... Electronically controlled DC

motor X1

Reel drive .., ,. DC motor ><1
Wow and flutter . H 0.06%(DIN), 0.035(WRMS)
Tape winding time ........ 80 sec4(C-60 Tape)
Frequency response
Normal tape .......... 15H2t019,000Hz :3dB
CrO2 tape ............ 15Hz to 19,000Hz inB
Metal tape . ., 15Hz to 21,000HZ iSdB
S/N .................... 57dB(Metal tape)
Dolby B type NR switch ON: 1m»
proves up to 5GB atlkHz,10dB
above SkHz
Dolby C type NR switch ON: Im
proves up to 15dB at SOOHZ,
ZUdB at lkHz to 10kHz

Total harmonic distortion . 0.7%
Input(Level/lmpedance)
Line ................. 70m\/47kohms
Output
(Level/Impedance)
Line ................. BSBmV/Zkohms
Headphone ..,. 1.3mW/80hms
Power requirement ...... AC 220V, 50Hz for Europe ex-
cept UK
AC 240V, SOHZfor UK and Aus-
tralia

AC 110V-120V/220V-240V,
50Hz/60HZ convertible for
other countries

Dimensions ............. 425(W)><137(H)x353(D) mm
(167X5.4X13.9 inches)
Weight ................. 5.5kg(12.1 lbs)

Standard accesories
Connection cord ................ X2
Operators manual .............. X1

For improvement purposes, specifications and design are subject to change without notice.
Noise reduction manufactured under license from dolby laboratories licensing corporation.
DOLBY and [I] symbol are trade marks of dolby licensing corporation.

Page 2

k SAFETY INSTRUCTIONS

PRECAUTIONS DURING SERVICING

. Parts identified by the A (as) symbol are critical for

safety. Replace only with parts number specified.

In addition to safely. other parts and assemblies are spe-

cified [or conformance with such regulations as those ap-

plying to spurious radiation

These must also be replaced only with specified replace-

ments.

Examples: RF converters, tuner units. antenm selector

switches. RF cables. noise blocking capacitors. noise

blocking filters. etc.

. Use specified internal wiringi Note especially:

1) Wires covered Mill IVC tubing
2) Double insulated wires
3) High voltage leads

4, Use specified insulating materials for hamrdous live

parts. Note eSpecially:

l) Insuluti n Tape

2) PVC tubing

3) Spacers (Insulating Barriers)

4) Insulation sheets tor transistors

5) Plastic screws tor fixing microxwitch (especially in
turntable)

, when replacing AC primary side components (trans-
formers. power cords. noise blocking capacitors. etcr).
wrap ends of wires securely about the terminals before
soldering.

unis???

6 Observe that wires do not Contact heat producing parts
(healsinks. oxide metal film resistors. fusible resistors,
etc.).

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* INFORMATION

7. Check that replaced wires do nol contact shurpedged or
pointed pflflsr

3. Also check areas surrounding repaired locations.

9. Use care that foreign objects (screws. solder droplets,
etc.) do not remain inside the set,

SAFETY CHECK AFTER SERVICING

Atier servicing, mire measurements of leakage-current or
resistance in order to determine that exposed pnrts nre ac»
ceptnhly insulated Item the supply circuit.

The leakage~current measurement should [redone between
accessible metal parts (such as chassis. ground terminal.
microphone jacks. signal and the earth ground througharesisteroi 1500 ohms paral-
leled with 2 oils ltF capacitor. under the unit's normal
working conditions The leakage-current should be less
than 0.5 mA rms AC.

The resistance measurement should be done between acv
cessible exposed metal parts and power cord plug prongs
with the power switch (if included) "ON. The resistance
should be more than 2.2 Mohms.

SYMBOLS FOR PRIMARY DESTINATION

Alphabet indicates the destination ol the units as listed
below.

Destinations

USA
UK
Canada

Ausrrslls
w.

Universal Are:
Custom version

VOLTAGE CONVERSION (E Model only)

Before connectingthe powercordjet the VOLTAGE SE-
LECI' OR located on the rear panel with a screwdriver so
that the correct voltage is indicated.

SERVICE MANUAL

I. CONTROLS

Ir I . FRONT PANEL

o .A. EJECT button
To open the cassette holder and
elect the cassette tape.

9 POWER button
To turn Ihe power on and off.

0 Cassatt Md and Holder
Load a cassette tape here.

0 REMOTE SENSOR Wlndaw
For reception of the remote control
signal lrom the optional RC-695 re-
mote control unit.
Keep away lrom strong light and di-
rect sunlight as this will Interfere Wllll
the remote control function.
Note 10! the RC-GSS remote
control unit
The DISPLAY, IPSS, MEMORY A -
B and FIEC CANCEL bultons no

lunctiun on Illa GX-GS remote control.

0 FL Display
Tells you what the cassette deck is
doing

0 MONITOR Bumon (T APE/SOURCE)
To selecl between TAPE and
SOURCE monitor modes.

This button is incorporated with an
auto monitor system.

0 COURIER RESET Bmon
To reset the digital laps counter to
the 0000 position,

0 COUNTER MEMORY Button
To turn the counter memory system
on and all.

0 Operation Button; («:nowlno
button. btPlay button. »:Flll
forward button. M: REC PAUSE
humn, l:$iap bIIIIOn. O:AUTO
MUTE bulb)

To start and stop recording and
playback, to wmd the tape and to
engage the auto mute mode.

0 npx FILTER swltoh
(- om- OFF)
To turn the multiplex tiller on and oft

O DOLBY NR GWPEIETVPE Snloet
Swltch (. C-TYPE/n B-TYPE)
To select between a type or c type
noise reduction lor recording and
playback purposes.

0 DOLBV NR ONIOFF awlwh
(. om- OFF)
To turn the DOLHY NR system on
and all for recording and playback
purposes.

. REC LEVEL Camrol
To set the recording input level. The
level adiustmenl is the some amount
for both left and right channels.

SERVICE MANUAL

Fig l-l

. REC BALANCE control
(LEFT/RIGHT)
To set the recording input level Iolt
and light channel balance.
Normally set the control to the cell-
tar click " l " position.

. BIAS Oomml (-20H'20)
To adjust the recording bias current
during recording,
The bias adluslment range ls be-
tween -20°/o and +20% M the
proper bias current tor Normal, Clo:
and Metal position tapes. Normally
set the control lo the center cllck 0'
position

0 PHONES LEVEL control (MINI
MAX)
To adjust mo output level ol the
PHONES isclr.

O PHONES Jack
For headphone connection.

0 TIMER START Snitch (REC/OFF]
PLAY)
To select operauon of the nmer start
lunchon when the power is turned
on.