Pioneer CT-70R Service Manual page 36

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7. Recording Level Adjustment |
a a
Mode Input signal & test tape Adjustment location Iuheeniving location Adjustment value Remarks
1
1 Recording Apply 315Hz/-10dBv (316 INPUT level control | -7.7dBv INPUT level control position
Pause mV) to LINE INPUT {412.mV) setting
terminals.
Recording Record the signal on the VR307 (left ch.) ~7.7dBv
/playback STD-608A test tape, and VR308 {right ch.} (412.1mV)
then play that section (playback level)
of the tape. TP.1 (left ch.)
TP.2 (right ch.)
3 Recording Record the signal on the VR309 (left ch.) (Dolby NR assy} -7.7dBv Repeat the recording and
/playback STOD-603 test tape, and VR310 (right ch.) (412.1mV) playback, and adjust accord-
then play that section (playback level) ingly.
of the tape.
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4 Recording Record the signal on the VR311 (left ch.) ~7.7dBv
/playback STD-604 test tape, and VR312 (right ch.) (412.1mV)
then play that section (playback level)
of the tape.
1
5 VR307, VR309, and VR311 {left channel) and VR308, VR310, and VR312 (right channel) are to be adjusted in the specified adjustment order. If any
single control is adjusted separately, always check {and adjust) the other controls which follow it in the adjustment procedure order.
8. Level Meter OdB Check
| | Moe | Input signal & test tape Adjustment location | Measuring location Rated specifications
Recording Apply 315Hz/-10dBv INPUT level controt {TP.1 (left ch.) Check that the level is -7.7dBv+2dB when the
pause (316mV) to LINE INPUT TP.2 (right ch.) "'OdB'"' display segment lights up.
terminals. {Dolby NR ass'y)
9. Leader Tape Detector Level Adjustment
S| Mode | input signal & test tape Adjustment location [Measuring location [Adjustment value Remarks
1 Disconnect the CN304 connector.
Stop Apply a 2kHz/-17dBv VR319 Pin 4 of 1C303 DC10.5V+0.25V
(0.4Vp-p) signal to the (PA3010)
TP (PH TR OUT) terminals.
Reconnect the CN 304 connector.
Playback Load a cassette half which
is without any tape
The position marked | TP. (PH TR OUT)
"A" in Fig. 10-19
If the waveform (square wave) at the measured
location is greater than 0.6Vp-p, connect the section
indicated by "A" in Fig. 10-19.
Fig. 10-19 Adjustment location (on foil side of Mother assembly)
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