Teac Z-6000 - 6-5 DBX PERFORMANCE; 6-7 DBX PCB ADJUSTMENT; PREPARATION; ENCODING ADJUSTMENT

Adjustment and measuring paints without special mention
refer to REC AMPL PCB. (See fig. 6-2}
ADJUST MEASURING
ITEM SETTING INBUTSIGNAL, ||| OORT | Ge uLT | REMARKS
° Connection: Fig. 6-6, but engage 1-kHz filter. ;
@ Record a 1-kHz signal. Push REC MUTE button for several seconds. {At this time, make sure
LED on the button lights). Rewind and play the tape. Find the difference between the 1-kHz
portion and the “'no-signal”’ portion.
23. REC MUTE
function LINE IN.
; 1 kHz/+1 dB :
MTT-5061 {0.859 V) SaecE Cie ratio
; e
no signal
® Record a 1-kHz signal with NR SYSTEM switch OUT, Play this portion with NR SYSTEM switch
set first to OUT, then to DO 8. Obtain the difference in output ievei between OUT and OO B positions.
Repeat the above process using a 10-kHz signal,
24, Dalby NR . LINE IN: OUTPUT:
effect : 1 kHz/-29 a8 Check Variation ©
(B-type) (27.5 mV} 3dB~8dB
MTT-5061 0s P= en bon 4 -- == p+
LINE IN: OUTPUT:
10 kHz/-38 dB Check Variation
{8,69 mV) 8dB~ 10dB
. Repeat the same procedure as above, only see that the NR SYSTEM switch is set to DOC.
uy LINE IN: OUTPUT:
; 1 kHz/-39 dB Check Variation
25. Dolby NR (8.68 mV} | 16 dB ~ 20 dB
affect MTT-5061 emer eer ren poco
(C-type) . LINE IN: OUTPUT:
10 kHz/-49 dB Check Variation
{2,75 mV} 16 dB ~ 20 dB
6-5 DBX PERFORMANCE
Note: DECK settings: TEAC test tape:
® Test DBX performance only after MONITOR sw: TAP MTT5072: For METAL record test
you are sure that the “6-7 DBX MASTER & REC PREGET LEVEL cont:
PCB ADJUSTMENT" is correct. Specified position (item 9)
@ TP,.101/TP,201, TP.103/TP.203: NR SYSTEM sw: dbx
on PLAYBACK AMPL. PCB QUTPUT cont:
Others; DBX PCB . Specified pasition (item 3}
INPUT sw: LINE
ADJUST MEASURING
ITEM SETTING — INPUT SIGNAL lor CHECK) POINT: RESULT REMARKS
LINE IN:
REC/PLAY mode TP.103/TP.203
400 Hz/-14.5 dB Check
MTT-5072 (146 mV). ; ~8.2 dB {300 m¥)
: If, in the above step, the result is not within specifications, adjust using the MASTER and
26. Encocing level REC PRESET LEVEL controis so that the correct vaiue is obtained when the contrals are
in the specified pasitions (item 9),
LINE IN: _| P701-1/P701-4
Seca. oo 400 Hz/-14.5d8 | R727/R827 | on DBXPCB:
{146 mV} ~8.2 dB {300 mV)
Record a 400 Hz signal with NR SYSTEM switch OUT, Rewind and play the recorded portion,
Note the off-the-tape level from OUTPUT. . .(+). Repeat the above process with NR SYSTEM switch
set to dbx. Note the off-the-tape jevel. . {2}. Compare the difference between (1) and (2).
If +1 dB or more, correct with R727/RB27 using {1} as reference.
27. Decoding level | P702-1/P7024
“ ; LINE IN: Check on DBX PCB;
REC/PLAY mode 400 Hz/-14 5 dB -8.2 dB (300 mV}
MTT-5072 :
(146 mV}
| TP,101/TP,201:
R767/RB67 | 8.2 dB (300 mv)
LINE IN: OUTPUT:
400 H2/-14.5dB | Check -10.5dB+2d5 |.
{146 mV} eens, ° {184 mVto 291 mV)
, : OUTPUT:
Check . +22.5dB+3dB
(41.1 mV to 82 mV}
STOP mode : ;
MONITOR sw: SOURCE
NR SYSTEM sw: OUT LINE IN:
ENPUT sw: dbx DISC 20 H2z/-14.5 gB
{146 mV}
‘28. dbx DISC
22