Akai GX-F71

Step
Adjustment Test Tape
Mode
Adjustment
Item
Supply Signal
Parts
OP Amp
VR7
1
Off.Set
i
STOP
Pre Amp
PCB
Voltage
2
PB Level
333
Hz Test Tape
PB
i
VR5
(TF-IOlCL) Pre Amp
PCB
!
10 kHz Test Tape VR6
3
PB EQ
(TF-106CH)
PB
I
Pre Amp PCB
Normal
Normal Blank Tape
Position
VRll
4
Frequency
1 kHz, 10 kHz
REC/PB
Pre Amp
PCB
Response
-25.5 dBm
CrO
2
I
CrO
2
Blank Tape
5
i
Position
1 kHz, 10 kHz
REC/PB
VRIO
Frequency
I
-25.5 dBm
Pre Amp
PCB
Response
Metal
Metal Blank Tape
Position VR9
6
Frequency
I
I kHz, 10 kHz REC/PB
Pre Amp
PCB
Response
-25.5 dBm
7
REC Level
I
Normal Blank Tape
REC/PB
VR8
1 kHz,
-5.5 dBm Pre Amp PCB
8 MPX Filter
I
19 kHz
REC
FL4
from oscillator Pre Amp
PCB
9
Bias Filter
No Signal Input REC
FL3
Pre Amp
PCB
I 10
VU Meter
1 kHz,
-5 .5 dBm
REC
VR4
Sensitivity from oscillator Pre Amp
PCB
NOTES: 1. Output volume should be at maximum.
2. Dolby NR Switch
to OFF Position.
3. Except
for Step 8 set Dolby Filter Switch to OFF Position.
4. Use the following cassette measuring tapes:
Normal Tape Maxell
UD C-60
CrO
2
Tape TDK SA C-60
Metal Tape TDK
MA-C C-60
For your reference:
Confirmation of Dolby level
I) Set to REC/PAUSE.
GX-F51
I
Result Remarks
TPl
0
0.1
VDC
-5.5 ± 0.5 dBm
(410 mV)
-22.5 ± 1.5 dBm
1 kHz to 10 kHz
flat response
1 kHz
to IO kHz
flat response
I kHz to IO kHz
flat response
I
-5.5 ± 0.3 dBm
I
(410 mV)
Minimum
Output
MPX Filter ON
Minimum Output
Set REC Volume
to maximum
0
dB (VU)
indication
2) Input a signal of 400 Hz and adjust the input level so that the level of pin
580 mV when Dolby NR is OFF.
of Dolby LC (HA-12038) will be
3) Check that the level of TP-2 is 580 mV.
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