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14. Record Level | Test Setup:
(1)
Deliver a 1 kHz signal of -60 dB (0.775 mV) to the
Same as Item 13
MIC
jack.
Adjustment
(2)
(3)
Control/Switch Setting:
Set the TAPE SPEED switch to 19 cm/s (7-2 ips).
Record volume control
pe
bod
Place the unit in the stereo-record mode.
ee
specified position on page 25
(4)
Adjust R127, R128, R227 and R228 so that the
VTVM reads 0 + 1 dB.
MONITOR switch
...............
R127 (L-CH forwardgun)
R227 (R-CH forward run)
R128 (L-CH reverse run)
R228 (R-CH reverse run)
Specification:
O+1dB.....
Playback
output
at
19 cm/s
(7-1/2 ips) tape speed
O+2dB.....
Playback
output
at 9.5 cm/s
(3-3/4 ips) and 4.8 cm/s (1-7/8
ips) tape speed
(5)
When
changing
the
TAPE
SPEED
switch
to
9.5 cm/s (3-3/4
ips) and 4.8 cm/s (1-7/8
ips)
make
sure that the VTVM
reads 0 + 2 dB and
that the difference
between
L-CH
and R-CH
is
within 2 dB.
* The
level
difference
between
channels
at
9.5 cm/s and 4.8 cm/s tape speed
Spouete trades rtac ae ee _...
Within 2 dB
(6)
When changing a mode from stereo to monaural,
* The
level difference
between
stereo-record
make
sure
that
difference
between
them
is
within
1 dB.
mode and monaural-record
mode
baila Siibdn a. Sha eae eoase aT brah oy within 1 dB
Note: The adjustment should be performed for
both
L-CH
and
R-CH
in forward
and
reverse modes.
15. Idling
Set the POWER
AMP switch to ON.
Current
Test Setup:
b s
R e d a
power amp circuit board
(2)
Adjust R734
and R834 to obtain 20 mV on the
Adjustment
VTVM
idling current
adjustment
R734
RIGHT
©
R834 |
Specification:
Voltage at checking point......
Note:
Adjust as soon as possible since the POWER
AMP switch is set to ON.
— 34 —
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