Teac Z-6000 - 6 ELECTRICAL CHECKS AND ADJUSTMENTS; PRECAUTIONS; PLAYBACK PERFORMANCE

27-6000 |
16
6 ELECTRICAL CHECKS AND ADJUSTMENTS
PRECAUTIONS
1. Since this deck has an automati¢ tape selector, be sure to use test 4,
using test
tapes without such holes, please perform measurements after
having fixed EO70 usec detection switch {CrO,, METAL) and 5.
the METAL pasition switch on the MECHANISM PCB in the
tapes that have tane position detecting holes. When t:
Necessary position with adhesive tape etc.
2. Before performing adjustments and checks, clean and demag-
netize the entire tape path,
3. Make sure the deck is properiy set for the voltage in your local-
ity.
62 PLAYBACK PERFQRMANCE
TFRBOBB & HAs
indicate L-ch/R-ch. (Exampie: R101/R201)
in generai, adjustments and checks are made in the order of
L-ch then R-ch. Double REF, Nos. and test point designations
0 dB is referenced to 0.775 V. Jf an AC voltmeter that references
0 dB ta 1 V is used, appropriate compensation should be made.
6. The AC voltmeter used in the procedures must have an input
impedance of 1M&2 or more,
7. Note the “deck settings” at the top of each chart, The settings
otherwise.
Deck settings:
MONITOR sw
TEAC test tapes:
: TAPE MTT-150:
apply to afl checks for a specific chart unless explicitly stated
For Dothy level calibration
For playback frequency response NR SYSTEM sw: OUT MTT-356:
chack for METAL,
MTT-501: For S/N check with NORMAL
MTT-5061:
For S/N check with CrO,
Adjustment and test points without special mention refer
to PLAYBACK AMPL PCB
TEM SETTING [ INPUT SIGNAL ie cneeG =o MEASURING — REMARKS
Connection: Fig. 6-7 MTT-150 OUTPUT: j Refer to
1. REC-PLAY head
+ Check
| Phase: within 45° Fig. 6-9
azimuth
MTT-356 (12.5 kHz}
he
: Same as above
$
{ NRSYSTEM: OOB
‘2. Max, output
level
MTT-150
OUTPUT:
Max, output at L-&
R-ch’s fon VTVM)
Azimuth screw
of R.P head
(Fig. 6-8}
TP.101/TP201
580 mV {-2.5 dB)-
R117/R217
TP.101/TP201
580 mV ({-2.5 dB)
R135/R236 . OUTPUT:
+1dB+10B
——
fans
Connection: Fig. 6-7
NR SYSTEM: OUT
. Spesified
output level
Same as above
4. PEAK PRO- MONITOR: CAL
GRAM LEVEL
METER r
MONITOR: TAPE
Same as above
MONITGR: CAL
EQ 70 usec detector
switch:
120 wsec (NORMAL)
Frequency
response
Same as above
STOP mode
Short circuit between
TP.106 & GND to release
playback muting
6. Signai-to-noise
- ratio
MTT-156
MTT-150
MTT-356
MTT-501
MTT -5062
OUTPUT cont.} GUTPUT R:
-5 dB (436 mV)
R304 {on MIC | OUTPUT L:
AMPL. PCB) . |... -5dB +0.5d8
{308 mV to 615 mV}
IMPORTANT: Do not. touch OUTPUT cont, during later checks.
R155/R255 . |] PEAK PROGRAM
LEVEL METER:
0OdB
R143/R243
Prior to L-ch
R108/R208
both frequencies
Nearly equal output Refer to
level (1.5 dB) at | ‘Fig. 6-11
OUTPUT:
At 10 kHz should be
approx.4.5dB higher | -
than measured in
above step.
Check
OUTPUT: S/N
48 dB min
(NORMAL)
OUTPUT: S/N
52 dB min
{CrO,}
Check