PIONEER CT-L5/ZVYXK
Manual de Servicio

CT-L5

6.2.1 Playback Section
(1) Tape Speed Confirmation
No. 1 Mode PLAY Input Signal/Test Tape NCT-111 (3 kHz) Adjustment Points VR2701 (Main Unit) (Refer to Fig. 6�4) Measurement Points TP R (W183) ( MAIN UNIT) Adjustment Value Remarks FWD adjustment REV Confirmation ( 3000 Hz +60 Hz ) �60

3000 Hz

+10 �10

Hz

(2) Head Azimuth Adjustment
¶ This unit is equipped with auto tape selector. ¶ Do not switch between forward and reverse operation with the screwdriver inserted.
No. Mode Input Signal/Test Tape Adjustment Points Head azimuth adjustment Screw (Fig. 6�4) Measurement Points TP L (W185) TP R (W183) ( MAIN UNIT) Adjustment Value Max. Playback signal level Remarks After adjustment, apply silicon bond to the head azimuth adjustment screw.

1

PLAY

STD-331E test tape (Playback: 10 kHz, �20 dB)

(3) Playback Level Adjustment
¶ Since this adjustment determines playback DolbyNR level, Perform it carefully.
No. Mode Input Signal/Test Tape Adjustment Points L ch R ch Measurement Points TP L (W185) TP R (W183) ( MAIN UNIT) Adjustment Value Remarks

1

PLAY

STD-331E test tape (Playback: 315 Hz, 0 dB)

VR2301 VR2302

�3.7 dBV

6.2.2 Recording Section
(1) Recording Bias Adjustment
¶ After the adjustment, caution should be exercised so as not to become under bias by checking the distortion rate.
No. Mode Input Signal/Test Tape Adjustment Points Measurement Points Adjustment Value Remarks

1

REC/ PAUSE REC = PLAY

Input a 315Hz signal to the AUX � terminal of XC-L5. Load the STD�632 test tape and record/playback the 315Hz and 10kHz signals. (see the Note below)

Input signal level L ch R ch

�23.7 dBV
TP L (W185) TP R (W183) ( MAIN UNIT) Repeat adjustment until playback level of the 10kHz signal is within 0.5dBV ±0.5dB from that of the 315Hz signal.

VR2801 VR2802

2

Note: Set the 10kHz input signal level to the same value as the 315Hz input signal level of step 1.

(2) Recording Level Adjustment
No. Mode REC/ PAUSE REC = PLAY Input Signal/Test Tape Input a 315Hz signal to the AUX � terminal of XC-L5. STD�632 test tape and record/ playback the 315Hz signal. Adjustment Points Measurement Points Adjustment Value Remarks

1

Input signal level L ch R ch

�7.7 dBV
TP L (W185) TP R (W183) ( MAIN UNIT) Repeat recording, playback and adjustment until playback level of the 315Hz signal becomes �7.7dBV±0.5dB.

VR2441 VR2442

2

*:

In case of adjustment as a single unit, enter the signal at 13P(RECL) and 15P(RECR) of CN2601(MAIN UNIT). At this time, connect an output buffer amplifier to the oscillator, and then connect a series resistor (180 �) after the impedance has become sufficiently low. (For MPX filter impedance matching)

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