Pioneer CT-W404R Service Manual - Page 10

CT-W5O4R 5.2 ELECTRICAL ADJUSTMENTS Adjustment Conditions 1. The mechanical adjustments must be completed first. 2. The head must be cleaned and demagnetized. 3. Turn 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 10 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 List of Adjustments Playback sections 1. Head azimuth adjustment. 2. Playback level adjustment. Recording sections 1. Bias oscillator adjustment. 2. Recording bias adjustment. 3. Recording level adjustment. 4. Level meter check. Test Tapes STD-331E STD-631 or STD-632 STD-621 STD-610 : Playback adjustments (See Fig. 5-3) : NORMAL blank tape : CrO2 blank tape : 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. NOTE: This unit has an automatic tape selection feature. Dolby noise reduction and HX Pro headroom extension marufactured under license from Dolby Laboratories Licens'ng Corporation. HX P'o originated by Bang & CPufsen. "DOLBY",the double-D symbol CC and "FIX PRO"are trademarks of Dolby Laboratories Licensing Corporation. 0 dB 30s 0 dB: 315 Hz, 250 iwbfm 315 Hz 30s 6.3 kHz 30s 10 kHz 30s 315 Hz 10s 10s 14 kHz 12.5 kHz 10 kHz 8 kHz 6.3 kHz 4 kHz 2 kHz 1 kHz 500 Hz 10s 250 Hz 125 Hz 63 Hz 40 Hz 20 dB DECK I Fig. 5-3 Constants of the test tape STD-331E PLAY BACK 250 3dB REV azimuth adjustment screw DECK II FWD azimuth adjustment screw RECORDING 250 O 3d8 12 5k 'ok A 3dB 4cl B 125k 'Ok 3dB 5d5 REV azimuth adjustment screw FWD azimuth adjustment screw Fig. 5-4 Head azimuth adjustment Fig. 5-5 Frequency response zone 12