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STEP
1
2
3
4
5
6
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7
8
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9
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10
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11
I 12
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13
14
ADJUSTMENT •
ITEM
FWD Playback
Level
REV Playback
Level
REC Peaking
BIAS OSC
BIAS
Current
FWD
Recording
Level
REV
Recording
Level
Bias leak
NORMAL
Position FWD
Frequency
Response
NORMAL
Position REV
TEST TAPE
I
SUPPLY SIGNAL
!MODE
700 Hz 7-1/2 ips.
FWD!
0 VU Test Tape
700
Hz
7-1/2 ips.
REV!
0 VU Test Tape
23.2 kHz from
an Oscillator
REC
REC
REC
NORMAL Blank
Tape 1 000
Hz
·
FWD/
i-5 .5 dBm' Recording
i
REC
I
NORMAL Blank
Tape 1,000 Hz
REV/
i
-5 .5 dBm Recording
REC
No signal input
Mic and Line
REC
Volume are MAX.
NORMAL Blank
i
Tape 1.5 kHz,
FWD/.
15 kHz -25.5 dBm
REC
Recording
NOR.\1AL Blank
Tape 1.5 kHz,
REV/
Frequency
• 15 kHz -25.5 dBm
REC
Response
Recording
EE Position
EE Blank Tape
Frequency
1.5 kHz, 20 kHz
FWD,
Response
-25.5 dBm
REV/
(3-3/4
ips)
Recording
REC
EE Position
EE Blank Tape
I
Frequency
1.5 kHz, 25 kHz
FWD,.
Response
-25.5 dBm
REV/
(7-1/2 ips)
Recording
REC
FWD
i
Distortion
1,000 Hz -5 .5 dBm • FWD/
Recording
I REC
Confirmation
REC
!
Distortion
1,000 Hz -5.5 dBm REV/
Recording
I REC
Confirmation
ADJUSTMENT
POINT
YRS
50
kB
VR6 SO kB
VLl lmH
Tl
VR3 20kB
VR2 20kB
VRl 20kB
FLl
(Mic Amp PCB)
VCl
VC2
VR410kB
I
VR9 30 kB
RESULT
REMARKS
• -5.5±0.5
dBm•
i
(410 mV)
!
I -5.5±0.5
dBm I
(410 mV)
! Maximum AC
Voltmeter
indication
Set TAPE SELECTOR
to "NORMAL"
Tape Speed 3-3/4 ips.
See NOTE 6, 7, 9 and
Figs. 9-3, 94, 9-5.
Set TAPE SELECTOR
to "NORMAL"
100 ±
0.5
kHz ·
Tape Speed 7-1/2 ips.
Connect a Frequency
Counter between TP
and GND. Fig. 9-5.
140±2 mV
-5 5+0 5 dBm
. -
.
(410mV)
!
-5.5±0.5 dBm
I
(410 mV)
i
Minimum
1.5 kHz,
15 kHz
flat
1.5 kHz,
15 kHz
flat
1.5 kHz,
20kHz
flat
1.5
kHz,
25 kHz
flat
NORMAL:
EE
See NOTE 8.
NORMAL:
EE
:
See NOTE 8.
Set TAPE SELECTOR
to "NORMAL"
Tape Speed 7-1/2 ips.
Connect a AC Volt-
meter between TP and
GND Fig. 9-5.
Tape Speed 3-3 /4 ips.
Recheck Recording
Level. See NO'TE 10.
I Tape Speed
3-3/4
ips.
Recheck Recording
Level. See
NO'TE
10.
I
Tape Speed
J.3/4
ips.
Recheck Recording
Level. See NO TE 10.
Tape Speed
7-1
/2 ips.
Recheck Recording
Level. See NO'"TE 10.
Less than 0.5%
Less than 0.4%
Less than 0
.5
%
Less than 0.4%
- - - - - - - - - - - - - - - S E R V I C E MANUAL
G X - 7 4 7 d b x - - - - - - - - - - - - - - -
37
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