Pioneer CT-L5, Service Manual

CT-L5

24

NCT-111 (3 kHz)

VR2701 (Main Unit)

(Refer to Fig. 6–4)

No.

Mode

Input Signal/Test Tape

Adjustment Points

Measurement Points

Adjustment Value

Remarks

PLAY

1

TP R (W183)

( MAIN UNIT)

3000 Hz       Hz

(1)  Tape Speed Confirmation

(1)  Recording Bias Adjustment

¶

 After the adjustment, caution should be exercised so as not to become under bias by checking the distortion rate.

STD-331E test tape

(Playback: 10 kHz, –20 dB)

Head azimuth

adjustment Screw

(Fig. 6–4)

Remarks

PLAY

1

TP L (W185)

TP R (W183)

( MAIN UNIT)

Max. Playback

signal level

(2)  Head Azimuth Adjustment

¶

 This unit is equipped with auto tape selector.

¶

 Do not switch between forward and reverse operation with the screwdriver inserted.

+10

–10

6.2.1  Playback Section

After adjustment, apply silicon
bond to the head azimuth
adjustment screw.

VR2301

PLAY

1

(3)  Playback Level Adjustment

¶

 Since this adjustment determines playback DolbyNR level, Perform it carefully.

L ch

R ch

VR2302

TP L (W185)

TP R (W183)

( MAIN UNIT)

6.2.2  Recording Section

VR2801

REC/

PAUSE

1

Input a 315Hz signal to the AUX
terminal of XC-L5.

∗

L ch

R ch

VR2802

TP L (W185)

TP R (W183)

( MAIN UNIT)

–3.7 dBV

Input signal level

–23.7 dBV

REC 

=

PLAY

2

Load the STD–632 test tape and
record/playback the 315Hz and
10kHz signals. (see the Note below)

Repeat adjustment until playback level of
the 10kHz signal is within 0.5dBV ±0.5dB
from that of the 315Hz signal.

(2)  Recording Level Adjustment

VR2441

REC/

PAUSE

1

L ch

R ch

VR2442

TP L (W185)

TP R (W183)

( MAIN UNIT)

Input signal level

–7.7 dBV

REC 

=

PLAY

2

STD–632 test tape and record/
playback the 315Hz signal.

Repeat recording, playback and
adjustment until playback level of the
315Hz signal becomes –7.7dBV±0.5dB.

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

Input a 315Hz signal to the AUX
terminal of XC-L5.

∗

No.

Mode

Input Signal/Test Tape

Adjustment Points

Measurement

Points

Adjustment

Value

Remarks

No.

Mode

Input Signal/Test Tape

Adjustment Points

Measurement

Points

Adjustment

Value

STD-331E test tape

(Playback: 315 Hz, 0 dB)

Remarks

No.

Mode

Input Signal/Test Tape

Adjustment Points

Measurement

Points

Adjustment

Value

Remarks

No.

Mode

Input Signal/Test Tape

Adjustment Points

Measurement

Points

Adjustment

Value

*

: 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 

Ω

) after the impedance has become sufficiently low. (For

MPX filter impedance matching)

FWD adjustment
REV Confirmation
( 3000 Hz       Hz )

+60

–60