Pioneer CT-1270WR Service Manual page 27

C T - 1 2 - 7 0 W R C B K
Deck II
1. Head Azimuth Adjustment
• Turn VR101 and V R 2 0 1 to mechanical center positions.
No.
Mode Input signal & test tape Adjustment location Measuring location Adjustment value Remarks
1
P L A Y Play the 10kH2/-20dB section
of the STD-331 B test tape.
Head azimuth adjust-
ment screw.
(FWD, R E V ) (See
Fig. 11-6).
L I N E O U T ? Maximum playback signal
level.
2 STOP
Lock the screw with screw lock after completing the adjustment.
2. Playback frequency response check
1
No.j Mode
Input signal & test tape Adjustment location j Measuring location Adjustment value [ Remarks
1 P L A Y STD-331 B
-
L I N E O U T The allowable zone showing i
in Fig. 11-7 is to be satisfied. - ;
.... . 1
3. Playback Level Adjustment
• The adjustment determines the D O L B Y NR level, and must be performed with great care.
No.
Mode Input signal & test tape | Adjustment location Measuring location Adjustment value | Remarks
1 P L A Y Play the 315HZ/CWB section ' V R 1 0 2 (Lch)
of the STD-331 B test tape. . V R 2 0 2 (Rch)
PB D O L , L (Lch)
PB D O L , R (Rch)
-13.5dBv
4. Playback Time Constant Switching Check
• Put the deck into playback mode with no cassette loaded, • >: s ;
• Check that the noise level changes at the line playback output terminals when the T A P E S E L E C T O R switch is changed.
5. Erasure Current Adjustment
No.
Mode
Input signal & test tape Adjustment location Measuring location Adjustment value Remarks
1 R E C
Load the STD-610 Standard
tape without an input
signal being applied.
V R 3 0 3
T P . I E ISOmV A C
/ ^!tn
-c' j r
(FWD)
"1
'r:
6. Recording Bias Adjustment
• After the adjustment, caution should be exercised so as not to become under bias by checking the distortion rate.'
No.
Mode
1
Input signal & test tape | Adjustment location
1
Measuring location Adjustment value
Remarks
1 STOP Set the T A P E S E L E C T O R switch to the NORM position.
2 R E C S T D - 6 0 8 A (NORM)
- 2 0 d B
V R 3 0 1 (Lch)
V R 3 0 2 (Rch)
L I N E O U T
-H.CWBtO.5dB
(6.3k/315Hz)
7. Recording Level Adjustment
No.
Mode
Input signal & test tape Adjustment location Measuring location Adjustment value
Remarks
1 STOP Set the T A P E S E L E C T O R switch to the NORM position.
2
R E C
P A U S E
Apply a 3 1 5 H z / - 1 0 d B v
(316mV) signal to the Line
Input terminals.
Ree Level control
. . .
R E C D O L , L (Lch)
R E C D O L , R (Rch)
-13.5dBv
3 Set the D O L B Y NR switch to the ON position. ( D O L B Y B)
4
R E C /
P L A Y
Record the above signal level V R 1 0 3 (Lch)
onto the STD-608A test tape, i V R 2 0 3 (Rch)
and playback.
R E C D O L , L (Lch)
R E C D O L , R (Rch)
-13.5dBv
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