Akai GX-646

—r eae
ADJUSTMENT TEST TAPE ADJUSTMENT
oe ITEM suPPLY SIGNAL |MOPE) pont RESUEE roecaaeie
Set TAPE SELECTOR
to “NORMAL”
BIAS Tape Speed 7-1/2 ips.
: Current REY MRS 20KR Peo my Connect a AC Volt-
meter between TP and
GND Fig. 16.
FWD NORMAL Blank
f FWD/ 0+0.5 dBm
6 Recording Tape 1,000 Hz VR2 20 kB
Level 0 dBm Recordin a (0.775)
i79 g
REV NORMAL Blank
7 Recording Tape 1,000 Hz — vRi20Ke | ° eu
Level 0 dBm Recording :
NORMAL
|
NORMAL
Blank
|
Position
FWD
|
Tape
1.5kHz,
|
FWD/
bee
beer
,-
|
Tepe
Speed
3
SUID
8 VCl 15 kHz Recheck Recording
Frequency 15 kHz —20 dBm | REC
: flat Level.
Response Hes Recording
NORMAL NORMAL Blank :
Position
REV
Tape
1.5
kHz,
REV/
EEE,
depo
Sreed
pies
se
9 VC2 15 kHz Recheck Recording
Frequency 15 kHz —20 dBm | REC
‘ flat Level.
Le Response Recording
cue | BE Blank Tape | FWD, 1.5kHz, | Tape Speed 3-3/4 ips.
10 jens 1.5 kHz, 20kHz | REV/| VR410kB 20kHz | Recheck Recording
(3-3/4 ips) —20 dBm recording | REC flat Level.
Sa EE Blank Tape | FWD, 1.5kHz, | Tape Speed 7-1/2 ips.
11 Rewer 1.5 kHz, 25kHz | REV/| VR930kB 25kHz | Recheck Recording
(7-1/2 ips) —20 dBm Recording] REC flat Level.
FWD 1,000 Hz 0 dBm | FWD/ | NORMAL: Less than 0.5%
12
Distortion
Recordin
REC
EE
:
Less
than
0.4%
Confirmation ae L See NOTE 8.
REV NORMAL: Less than 0.5%
13
Distortion
cae
ye
j
om
ee
EE
:
Less
than0.4%
Confirmation ene See NOTE 8.
oe hee ee 0 VU Set MONITOR Switch
14
Sensitivity
from
an
STOP
VR8
1
kB
Ogee
oe
bi
5
; indication to “SOURCE
(JPN) | __ Oscillator
NOTES: 1. Output Level Control should be at maxi- 6. Stop Recording bias oscillator while mak-
mum. ing Rec Peaking adjustment (Refer to Fig.
2. Except for Steps 3, 8, 9 and 10, set Tape 16).
Speed to 7-1/2 ips. 7. When 23.2 kHz indicates the peak, check
3. Except for Steps 10 to 12 and 13, set Tape and ensure that the AC Voltmeter show 16
Selector Switch to NORMAL Position. dB of increase when 15 kHz of input is fed
4. Set Bias Adjustment Volume to center rather than when 1 kHz is fed.
position. 8. If it does not comply with the specifica-
5. Use the following open measuring tapes: tions repeat Steps 6 to 10 and 11, and re-
NORMAL Tape: Maxell UD adjust.
EE Tape : Maxell XLII 9. Unless the core is moved intentionally this
TDK SA adjustment is not necessary.
18