Akai GXC 39 D Service Manual

Page 2

CASSETTE TAPE DECK

MODEL GXC-39D

ALSO APPLICABLE TO MODEL GXC-39

SECTION 1 SERVICE MANUAL ............................................................ 3
SECTION 2 PARTS LIST ..........................
SECTION 3 SCHEMATIC DIAGRAM

Page 5

I. SPECIFICATIONS

An asterisk next to a figure indicates the minimum guaranteed performance.

TRACK SYSTEM

4 track, 2 channel stereo system

TAPE SPEED

1-7/8 ips. (4.75 cm/sec) 13%

WOW AND FLUTTER

Less than 0.08% W.R.M .5.
*Less than 024% R.M.S.

TOTAL WOW AND FLUTTER

*Less than 0.3% R.M.S.

FREQUENCY RESPONSE LOW NOISE TAPE
CHROME TAPE

Fe-Cr TAPE

30 to 14,000 Hz 1'3 dB
*50 to 13,000 Hz 1'4 dB
30 to 16,000 Hz i3 dB
*50 to 14,000 Hz :4 dB
30 to 17,000 Hz i3 dB
*50 to 14,000 Hz 1'4 dB

DISTORTION FACTOR

Less than 1.5% at 1,000 Hz 0 VU recording

TOTAL DISTORTION FACTOR
LOW NOISE TAPE
CHROME/FeCr TAPE

'*Less than 3% at 1,000 Hz 0 VU recording
*Less than 5% at 1,000 Hz 0 VU recording

SIGNAL TO NOISE RATIO

Better than 47 dB
*Better than 40 dB

TOTAL SIGNAL-TO-NOISE RATIO

*Better than 40 dB

RESIDUAL NOISE

Less than 10 mV at 8 ohm load

OUTPUT LI NE OUTPUT

0.775V (*0 dBm 11.5 dB), using a 333 Hz 0 VU
prerecorded tape.

DIN OUTPUT 0.55V
HEADPHONE OUTPUT 30mV/8 ohm, using a 333 Hz 0 VU prerecorded tape.
SPEAKER OUTPUT 4.5W at 8 ohm, each channel
INPUT/IMPEDANCE MIC More than 0.3 mV/ 10 k ohm
LINE More than 50 mV/430 k ohm
DIN More than 3 mV/30 k ohm

RECORDING/PLAYBACK LEVEL
LOW NOISE TAPE
CHROME TPAE

0 dBm i2 dB, 1,000 Hz 0 VU recording
-3 dBm 11.5 dB, 1,000 Hz 0 VU recording

CROSS TALK

Better than 25 dB, 1,000 Hz 3 VU recording

ERASE RATIO
RECORDING BIAS FREQUENCY

Better than 70 dB, 1,000 Hz 3 VU recording
65 :3 kHz

BIAS LEAK

Less than -20 VU

RECORDING TIME

90 rnin. stereo recording using a C-90 cassette tape.

FAST FORWARD AND REWIND TIME

90 sec. using a C-90 cassette tape

HEADS RECORDING/PLAYBACK HEAD

ERASE HEAD

4 track, 2 channel GX recording/playback head
Type: P4-341

Gap: 1.7 microns

Impedance: 1,000 ohm 120% at 1 kHz

D.C. Resistance: 190 ohm

2 track, 1 channel erase head

Type: E4-100

Gap: 0.2 to 0.3 mm

Impedance: 730 ohm 110% at 100 kHz

D.C. Resistance: 6.0 ohm

Page 37

10. ILLUSTRATION 0F REAR CHASSIS BLOCK

19 \

REAR

Ref.

10-]
10-2
10-3x

10-4X

lO-Sx

l 0-6x

10-7
1078
10-9
1010
lo-llx

10-12

10-13x
10»14x
lO-le
10-16x
10-17):
1048K
10-19

10-20
10»21X

10722x
10-2 3x
10-24x

-;-- When ordering Darts. please describe Parts Number, Serial Number, and Model Number in detail.

O
a 0
Q
a
CHASSIS BLOCK
Parts No, Description sews):
REAR CHASSIS BLOCK
TC612066 Trans. Table CH>5308
BT631934 Power Trans. CGT-40 381')
BT631883 Power Trans. CGT-4l
(39,39-3 core) 3H~m
BT631912 Power Trans. CGT738
(CSA) +328
BT631923 Power Trans. CGT-39
. (CEE) 38-4-32?
BT631901 Power Trans. CGT-37
(JPN) 36747327
25325495 Tapping Screw #2 3x6
TC516598 Trans, Retainer 05*5337
135479507 Slide SW. 8-3 25-3-65
151631945 Strain Relief SR-4N-4 2-7-49
132246936 Strain Relief SR-6W»1
(3 core, CEE) 2+3
EW374894 AC Cord U/L 3M 26-3-19
EW524845 AC Cord 2.5M (JPN) 253731
EW315448 Australia Cord (3 core) 29-3-11
EW496855 AC Cord VM-0099 (CEE) 25.3.21
EW604585 Power Cord BSI 25.3.31
ZW273881 Earth Lug M4 (3 ore)
132639990 Lamp Shield B CWlle
TC613697 Volt Indication Plate CW75018
JACK PLATE BLOCK
B1636445 Jack Plate Block Comp.
3.1636434 Jack Plate Block Comp
(3?)
EJ624104 Jack Plate 1-2 31*S121
151639011 Jack Plate 1-1-4 (39) SHAH
EA659687 RC. Board, Jack 00-532]

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