Akai GXC-704D

Adjustment Test Tape Adjustment
Step J 'P Mode ae Result Remarks
Item Supply Signal Point
= = = ==
1
Playback
level
333
Hz,0
VU
PLAY
VR2
—-5.5
+0.5
dBm
adjustment Test Tape 50 kB (410 mV)
aoe
mei
|
i
4
VU Meter
pp 333 Hz,0 VU VR3 0VU
2
Sensitivity
PLAY
Festa
ets
. Test Tape 5 kB indication
adjustment
|
Rec peaking 14 kHz from Ll Hein (Refer to NOTE 5
3
;
.
REC
AC
voltmeter
:
adjustment
an
oscillator
3.3
mH
eae
and
Figs.
15,
16)
- indication
Low Noles. |
LN Position Blank tape 1,000 Hz to
frequency
1,000
Hz
VR5
10,000
Hz
2 response 10,000Hz | REC/PLAY| = 30048 flat
adjustment —25.5 dBm response
recording
a
CrO,
CrO,
Position
Blank
tape
1,000
Hz
to
Set
tape
selector
to
frequency 1,000 Hz 10,000 Hz
5 REC/PLAY CrO,.
response
10,000
Hz
flat
(Refer
to
NOTE
6)
confirmation —25.5 dBm response
recording
Low Noise
Recording Blank tape ays
6
“level
1,000Hz
|
REC/PLAY|
VN
:
P
ae
ae
adjustment —5.5 dBm me
recording
Distortion 1,000 Hz .
7 Factor -5.5dBm | REC/PLAY Ee bes than 13% (Refer to NOTE 7)
; : CrO,: Less than 2.0%
Confirmation
recording
2
r Bias Filt Macsianal FLI Minimum Recording volume to
8 psec pn REC DO7-002 AC voltmeter | maximum. *
q He P (ORG) indication | (Refer to NOTE 9)
19 kHz 19 kHz FL2 Minimum
9
filter
from
an
REC
DO7-001
AC
voltmeter
ot
ro
NOLE>
adjustment oscillator (BLK) indication :
Chart-1
NOTES: 1. Because each of these adjustments are vital to perfect Dolby NR circuit operation, be sure that they are
carried out with as little error as possible.
2. Except for Steps 5 and 7 set tape selector to Low Noise position.
3. Set Dolby NR switch to OFF position.
4. Use the following cassette measuring tape:
LN tape:
CrO, tape:
Fuji FL C-60
TDK SA C-60
5. Stop recording bias oscillator while making Rec Peaking Adjustment (Refer to Fig. 16).
6. If a flat characteristic cannot be obtained from 1,000 Hz to 10,000 Hz at CrO, position, re-adjust at
Step 4.
7. If it does not comply with the specifications, repeat Steps 4 to 6 and re-adjust.
8. Adjust the oscillators frequency to give a frequency counter reading of 19.00 kHz.
9. Unless the core is moved intentionary this adjustment is not necessary.
17