Pioneer CT-501 Service Manual page 26

eaters
CT-501,450,405
3. Playback Level Adjustment
@ This adjustment determines the DOLBY NR level, and must be performed with great care.
Mode | Input signal & test tape Adjustment location | Measuring location Adjustment value
1 STOP Set the TAPE SELECTOR switch to the NORM position. ee dl
2 | PALY | Play the 315Hz/OdB section of | V102 (Left channel) | J101 (L ch.) -7.7dBv (412.1mV})
the STD-331B test tape. V202 (Right channel)| J201 (R ch.) |
a oe —L
4. Level Meter Check
T
| Mode input signal & test tape Adjustment location | Measuring jocation | Adjustment value Remarks
a REC- Apply a 315H2/—10dBv REC LEVEL control | Left and right OUT- | Check that the level meters ""OdB" light up
PAUSE | (316mV) signal te the LINE PUT terminals. within -10dBv+1.8dB of the signal output
INPUT terminals. | level.
5. Recording and Playback Frequency Response Adjustment
Mode Input signal & test tape Adjustment tocation | Measuring location | Adjustment value Remarks
STOP Set the TAPE SELECTOR switch to the NORM position.
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2 REC. Apply a 315Hz/-30dBv REC LEVEL control | Left and right OUT-} -30dBv (31.6mV)
PAUSE | (31.6mV) signal to the LINE PUT terminals.
INPUT terminals.
3 REC/ Record the above signal level V104 (Left channel) Left and right OUT-} Adjust the 6.3kHz playback level to OdB
PLAY onto the STD-6GOB8A test tape V204 (Right channel)] PUT terminals. higher then the 315Hz level. '
at 315Hz and 6.3kHz, and
play back.
4 Record and play back signal up to 12kHz onto the STD-608A test tape, and check that the allowable frequency response
zone shown in Fig. 11-9 is satisfied. If the response zone is not met, change the adjustment value of step 3 withint! _ gp
and readjust step 3. 0.5
Set the DOLBY NR switch to the ON position. Record and play back signals up to 10kHz onto the STD-6O8A test tape, and
check that the allowable frequency response zone shown in Fig. 11-9 is satisfied (for DOLBY NR B and C).
Set the TAPE SELECTOR switch to the CrO, position. Record and play back signals up to 12kHz onto the STD-6(3 test
tape, and check that the allowable frequency response zone shown in Fig. 11-10 is satisfied (for DOLBY NR OFF, Band C).
Set the TAPE SELECTOR switch to the METAL position. Record and play back signals up to 12kHz onto the STD-610 test
tape, and check that the allowable frequency response zone shown in Fig. 11-11 is satisfied (for DOLBY NR OFF, Band C).
Set the TAPE SELECTOR switch to the NORM position.
REC- Apply a 315H2/-10dBv REC LEVEL control | J104 (L ch.) -7.7dBv (412.1mV)
PAUSE | (316mV) signal to the LINE J201 (R ch.)
INPUT terminals.
Set the DOLBY NR switch to the ON position.
6. Recording Level Adjustment
Input signal & test tape Adjustment location
a
(2) ao)
REC/ Record the above signal level V103 (Left channel) | J101 (L ch.) -7.7dBv (412.1mvV)
PLAY onto the STD-608A test tape, V203 (Right channel)} J201 (R ch.)
and play back.
Set the TAPE SELECTOR switch to the CrO, position. Pca ne ot oa
Record the above signal onto Confirm J101 (L ch.) -~7.7dBvt1.5dB
the STD-603 test tape, and
play back.
J201 (R ch.)
Set the TAPE SELECTOR switch to the METAL position.
Record the above signal onto Confirm J101 (L ch.) -7.7dBv:1.5dB
the STD-610 test tape, and
$201 (R ch.)
play back.