Akai GX-77 Service Manual

Remarks
Erase ? Upper edge of Left Ch. head core is 0.1 mm
é Optional WD Pper ecg
Head Height ee (k)@) higher than upper edge of tape.
Recording ‘ U dges of Left Ch. head core and tape
: Optional FW Pper cee P
Head Height (a) ©) ©) are the same height. See NOTE 6.
Playback , U dges of Left Ch. head core and tape
; Optional FWD Pper &dpes ©. P
Head Height | Onto | ew (4)@)@) | are the same height. See NOTE 6.
Playback 8,000 Hz
Head Azimuth 3-3/4 ips
Alignment Test Tape
8,000 Hz
3-3/4 ips
Test Tape
Maximum output, both channels.
Playback
Head Angle
Alignment
Adjust head gap surface so that there is no
change in output level when tension is
applied to the supply reel side.
Recording
Head Azimuth
Alignment
Maxell UD Tape
15,000 Hz
-—20 dBm
Maximum output, both channels.
See NOTE 7.
Adjust head gap surface so that there isno
change in output level when tension is
applied to the supply reel side. See NOTE 7.
Recording
Head Angle
Alignment
Maxell UD Tape
15,000 Hz
~20 dBm
Fig. 39
NOTES: 1. As perfect head adjustments are vital to tape deck performance, be sure that these adjustments are carried
out properly.
. Be careful not to use a magnetized driver or other magnetized tools in the vicinity of the heads.
Use only new tape as level variation is likely to occur when using old tape.
. Demagnetize heads with head demagnetizer before and after head adjustment.
. Set tape speed to 7-1/2 ips.
. Simultaneously adjust the front and back tilts of head until uniform contact is ensured betweenthe tape
and the surface of head.
. Set Tape Selector Switch to NORMAL Position.
. Adjustments outlined in Fig. 39 are only for FWD side heads. However, adjustments for REV side heads
are exactly the same.
Anh WN
co 4
31

Akai GX-77 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	3 3/4 ips, 7 1/2 ips
Wow and Flutter	0.03% (19 cm/s)
Heads	3
Motors	3
Dimensions	440 x 244 x 358mm
Inputs	Line input (RCA)
Outputs	Line, Headphones