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ITEM
MEASUREMENT
& ADJUSTMENT
REMARKS
Playback gain
Equipment:
*VTVM
« Oscilloscope
* Test tape---QZZCFM
Playback S/N ratio
Equipment:
«VTVM
* Oscilloscope
* Test tape ---QZZCFM
* Empty cassette
Bias leak
Equipment:
*VTVM
* Oscilloscope
Playback frequency response chart
H
200Hz
AkKHZ = & 3kHz
125Hz
Ae
Fig. 15
Adjustment method
If the measured value is not standard, adjust VR1 (L-CH), VR2 (R-CH).
_ Test equipment connection is shown in fig. 11.
2. Play standard recording level portion on test tape (QZZCFM 315Hz),
and using VTVM measure the output level at LINE OUT jack.
. Make measurement for both channels.
Standard value: 0.65V
|
Adjustment method
_ If measured value is not standard, adjust VR3 (L-CH), VR4 (R-CH)
(See fig. 28 on page 10).
. After adjustment, check "Playback frequency response" again.
1. Test equipment connection is shown in fig. 11.
2. Play standard recording level test tape (QZZCFM 315Hz) and read
output level on VT VM.
Refer to "Playback gain adjustment"
. Place empty cassette (which has been cut) and playback again.
. Measure noise level at this time using VTVM, and determine ratio of
this level to test tape output signal voltage (315 Hz).
e W
| Standard value: Greater than 45dB
1. Test equipment connection is shown below.
L5 (L-CH)
TPS (L-CH)
L6 (R-CH)
TP6 (R-CH)
VIVM _ Oscilloscope
Fig. 16
2. Place UNIT into recosd mode.
3. Adjust trap coil L5 (L-CH), L6 (R-CH), so that measured value on
VTVM becomes minimum.
4 Take adjustment for both channels.
* Playback mode
* Output level control
... MAX
* Playback mode
* Output level control
-» MAX
a
Eanes
* Record mode
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