Akai GX-2800D-SS

VI. AMPLIFIER ADJUSTMENTS
PB.
AMP.
PC.
BOARD
(1)
PB.
AMP
PC.
BOARD(2)
.
_
7
CH-| FRONT LEFT
CH-2 REAR LEFT
CH-3 FRONT RIGHT
CH:
4
REAR
RIGHT
oy
Prev
NOTE;
PB.
AMP
PC.
BOARD
(1)
AND
(2)
ARE
SAME
RC.
BOARD
MS~5022
Fig.
17°
VU METER SENSITIVITY ADJ. FRONT REC.LEVEL ADJ.
6X-280-SS
VR2
VR2b
VRI
.-
VRIb
HIGH
LINE
SENSITIVITY
OUTPUTS _ V.T. VAM,
Hig. 19
1. PLAYBACK OUTPUT LEVEL
ADJUSTMENT
“ 1) Connect a high sensitivity V.T.V.M. to the line
output terminals. ~
2) Depress “7-1/2 ips” Tape Speed Selector Switch,
vRI
VRIb
vRI
VRib
-set
Monitor
Switch
to
TAPE,
and
set
Stereo
SSS
|
PB.
LEVEL
ADJ.
REAR
REC,
LEVEL
ADu.
Selector
to
“4
CH”
position.
3)
Playback
a
250
Hz
“0”
VU
recorded
test tape.
Fig.
18
4)
Adjust
P.B.
Amp.
P.C.
Board
playback
level
adjustment
semi-fixed
resistors
VR1
(50
kB)
and
(A):
FRONT
P.B.
AMP.
P.C.
BOARD
MS-5022
VR1b
(50
kB)
shown
in
Fig.
18
(VR1
front/rear
(B):
REAR
P.B.
AMP.
P.C.
BOARD
MS-5022
left
channel;
VR1b
front/rear
right
channel)
to
(C):
FRONT
REC.
AMP.
P.C,
BOARD
MS-5023
obtain
a
V.T.V.M.
indication
of
4
dB
(1.228V)
(D):
REAR
P.B.
AMP.
P.C.
BOARD
MS-5023
on
each
channel.
E): OSC. P.C. BOARD KF-5010
©)
2.
VU
METER
SENSITIVITY
ADJUSTMENT
After every channel adjustment has been completed,
adjust P.B. Amp. P.C. Board VU meter sensitivity 1
adjustment semi-fixed resistors VR2 (5 kB). and
VR2b (5 kB) shown in Fig. 18 (VR2 front/rear
left channel; VR2b front/rear right channel) to ob-
tain a VU meter indication of “0” VU (0 position).
16