Electrical Adjustments - Pioneer CT-W801R Service Manual

CT-W801R, CT-W851R, CT-W701R
8.2 ELECTRICAL ADJUSTMENTS
Adjustment Conditions
1. The mechanical! adjustments must be completed first.
2. The head must be cleaned and demagnetized.
3. Tum power on allow the deck to warm up for at least a few
minutes before commencing any electrical adjustments.
4. The reference signal is 0 dBV=1 Vrms.
5. Connect a 50 kQ (or between 47k to 52 kQ ) load resistance
to the OUTPUT terminals.
6. Unless otherwise specified, the switches listed below are left
in the positions indicated.
DOLBY NR : OFF
TAPE SELECTOR :NORM
Test Tapes
STD-331E : Playback adjustments
(See Fig. 8-3)
STD-631 : NORMAL blank tape
STD-621 : CrO2 blank tape
STD-610 : METAL 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 (160
nwb/m). When adjusting, pay carefull attention to the type of
tape used.
0dB 30s
List of Adjustments
Playback sections
1. Head azimuth adjustment.
2. Playback level adjustment.
Recording sections
Bias oscillator adjustment.
Recording bias adjustment.
Recording level adjustment.
Level meter check.
SUPER AUTO BLE adjustment.
NOTE: This unit has an automatic tape selection feature.
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Dolby noise reduction and HX Pro headroom extension manufactured
under license from Dolby Laboratories Licensing Corporation. HX Pro
originated by Bang & Olufsen.
"DOLBY",the double-D symbol 00 and "HX PRO" are trademarks of
Dolby Laboratories Licensing Corporation.
0 dB: 315 Hz, 250 nwb/m
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Fig. 8-3 Constants of the test tape STD-331E
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azimuth adjustment screw azimush adjustment screw
Fig. 8-4 Head azimuth adjustment
32
PLAY BACK
RECORDING
Fig. 8-5 Frequency response zone