JVC TD-V711 - Page 11

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TD-V711 A/BIC/E/G/J/U
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Item Adjustment method Adjusting Standard Remarks
point value
Recording Input LINE IN terminal so that source | VR301, Normal Left and right level difference |
level 1) motor output is — 8 dBs. 401 —8 dBs should be within 1 dB for both
2) Ajust recording signal electric current +0.5 dB |normal and metal. Adjust with
at VR301, 401 so that output is Chrome normal tape. Check that level
— 8 dBs when recorded/played back. Metal difference of chrome and metal
-—8 dBs is within 1.5 dB and left and
+1 dB right level difference is within
1.0 dB.
Level indicator | 1) Apply 1 kHz signal so that line out- | VR903 Input
adjustment put level becomes -—38dB at —Lights at
and check monitor (source). — 38 dB
Adjust VR903 so that FL level in- Lights out
dicator — 30 dB lights. at —40 dB
Lights should go out at — 40 cB.
2) Check that O dB indicator lights at
signal level of —8dB +0.3,
—0.7 dB.
Record/ 1) Record 1 kHz signal so that level Normal Check after adjusting bias elec-
Playback gauge indicator is +6 dB and LINE tape under | tric current and recording level.
distortion OUT output is — 2 dBs. 3.0%
check 2) Playback and measure output with Chrome
distortion gauge and check that it is tape under
at standard value. 4.0%
Metal tape
under
3.0%
Record/ 1)Record at 1 kHz, O dB input. Normal
Playback S/N Stop input during recording and record Over 45 dB
check with no signal. Chrome
2) Playback and measure difference of Over 45 dB
O dB recording output and no signal Metal
recording output with electronic Over 45 dB
voltmeter.
Check that difference is at standard
value.
Erasing check |1) Apply 1 kHz signal from LINE IN and . Over 65 dB /Connect B.P.F. (band pass
adjust recording volume to get
—8 dBs.
2) Raise signal level 20 dB and record.
3) Rewind tape and erase a part of the
recording.
4) Measure output ratio of recorded
part to erased part with electronic
voltmeter.
filter) between electronic
voltmeter and deck to measure.
Check with metal tape.
1 kHz 0 Vu
+20 dB
Deck,
recording,
input
Band pass
filter B.P.F.
erasing
Electronic
voltmeter
(No. 4294)
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