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ITEM
MEASUREMENT & ADJUSTMENT
REMARKS
Overall gain
Equipment :
* AF oscillator
« VTVM
* ATT
* Oscilloscope
* Test tape
(reference blank tape)
---QZZCRA for Normal
Fluorescent meter
Equipment :
* VTVM
* AF oscillator
* ATT
1. Test equipment connection is shown in fig. 19.
6,
R/P head
LINE IN
Test tape
R/P head
Playback mode
VTVM
Oscilloscope
Fig. 19
Place UNIT into record mode, and equalizer selector to 1205, bias
selector to LOW (for normal tape).
Supply 1kHz signal (—24dB) from AF oscillator, through ATT, to
LINE. IN.
Adjust ATT until monitor level at LINE OUT becomes 0.65 V.
Using test tape, make recording.
Test tape
_ Playback recorded tape, and make sure the value at LINE OUT on
VTVM becomes 0.65 V.
_ If measured value is not 0.65 V, adjust VR5 (L-CH), VR6 (R-CH) (See
fig. 28 on page 10).
_ Repeat from step (2).
Test equipment connection is shown in fig. 19.
Set the meter brightness control to "BRIGHT" position.
Supply 1kHz signal (—24dB) to the LINE IN jack, then press the
record button.
Adjust the ATT so that the output level at LINE OUT jack becomes
0.65 V. (=standard input level).
_ Adjustment at "O dB".
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Fig. 20
A. Adjust VRQ (L-CH) and VR10 (R-CH) so that the Fluorescent
meters show an illuminated indication up to "OdB" when the input
signal level is 0.9dB higher than the standard input level.
B. Then confirm that the Fluorescent meters show an_ illuminated
indication up to "+1dB" when the input signal level is 1.0 dB
higher than the standard input level.
Adjustment at "— 20 dB"
ed
20 (15) 10
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Fig. 21
* Record/playback mode
* Input level control ---- MAX
* Output level control
-» MAX
« Standard input level:
MIC «+++ e + —72+4dB
LINE IN --- —24*+3dB
* Record mode
« Input level control
-» MAX.
* Output level control
-» MAX.
* Tepe selectors
-+-normal position
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