Test Mode - Pioneer CT-L5 Service Manual

6.1.2 Test Mode 2

7 How to enter into Test Mode 2
(1) Press the "STOP" key in test mode 1 for at least 2 sec.
(2) When test mode 2 is entered, "TEST" is displayed on the CD
RECEIVER (XC-L5) displays the following, and the "PLAY"
and "REC" LEDs flash faster than in test mode 1.
7 Operation of test mode 2
(1) LINE MUTE opens in REC/REC PAUSE condition.
(2) When abnormal operation is detected, the corresponding code
will be displayed on the CD RECEIVER (XC-L5) display.
Otherwise, operation and display are the same as in normal
condition.
6.2 ADJUSTMENT
Please execute this adjustment in test mode 2.
7 Adjustment Condition
(1) The ground at the time of adjustment shall be W184.
(Refer to Fig. 6–4).
(2) Clean the heads and demagnetize them using a head eraser.
(3) Set the measurement level to 0 dBV = 1 Vrms.
(4) Use the specified tape for adjustment. Use the labeled (A) side
of the test tape.
NCT–111 : For Tape Speed adjustment
STD-331E : For Playback adjustment
STD–632 : Normal blank tape
* As the reference recording level is 250 nwb/m for STD–
331E, the recording level will be higher by 4 dB for STD–
331B (160nwb/m). When adjusting, pay carefull attention
to the type of tape used.
(5) Provide yourself with the following measuring devides:
÷ AC millivoltmeter
÷ Low-frequency oscillator
÷ Attenuator
÷ Oscilloscope
(6) Adjust both right and left channels unless otherwise specified.
(7) Turn the DOLBY NR switch off unless otherwize specified.
(8) Warm up the unit for several minutes before adjustment. In
particular, be sure to warm up the unit in the REC/PLAY mode
for 3 to 5 minutes before starting recording/playback frequency
characteristics adjustment.
(9) Always follow the indicated adjustment order.
Otherwise, a complete adjustment may not be achieved.
Note: In case of adjustment as a single unit, connect a 27 kΩ load
resistor to pins 17(PBR) and 19 (PBL)of CN2601(MAIN
UNIT ).
0 dB 30s
0 dB: 315 Hz, 250 nwb/m
30 s
315 Hz
6.3 kHz
30 s 30 s 10s 10s .......................................................................................................... 10s
12.5
10 kHz 315 Hz 14 kHz
kHz
Fig. 6–3 Test Tape STD– 331E
7 Cancellation of test mode 2
Press the "STANDBY/ON" key or disconnect the AC power
supply.
7 List of Adjustments
¶ Playback Section
(1) Tape Speed Confirmation
(2) Head Azimuth Adjustment
(3) Playback Level Adjustment
¶ Recording Section
(1) Recording Bias Adjustment
(2) Recording Level Adjustment
PLAY BACK
250
3dB
RECORDING
250
3dB
Fig. 6–2 Frequency Characteristics
Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.
6.3
10 kHz 8 kHz 4 kHz 2 kHz 1 kHz
kHz
CT-L5
12.5k
10k
3dB 4dB
315Hz=0dB
12.5k
10k
3dB 5dB
315Hz=0dB
–20 dB
500 250 125
63 Hz 40 Hz
Hz Hz Hz
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