Teac C-3X Service Manual

Deck settings: TEAC test tapes:
MONITOR sw.: TAPE MTT-150: For Dolby level calibration
NR SYSTEM sw.: OUT MTT-316: For playback frequency response
SPEED sw.: STANDARD check for METAL, Co(Cr0,)
5-1 PLAYBACK PERFORMANCE EQ sw.: METAL MTT-216: For playback response check for NORMAL
MEASURING
ADJUST —_|POINT:
ITEM SETTING INPUT SIGNAL, (or CHECK) REMARKS
RESULT
Conn.: Fig. 5-2 OUTPUT:
1,
REC/PLAY
head
Azimuth
nut
of
|
@
Phase:
about
0°
azimuth OUTPUT cont.: convenient MTT-316 (12.5 kHz) R-P heads ‘on ‘scope (Fig. 5-4)
output level position (Fig, 5-3) Max. output on
OUTPUT: |
Phase: 45° min.
2. Phase shift Same as above MTT-316 Check (315 Hz)
90° min.
(12.5 kHz)
- - TP1/TP2
MTT-150 R11/R21 2.5 dB (581 mV)
Spec. setting of
OUTPUT: OUTPUT cont.
3. Specified output zs MTT-180. OUTPUT cont, 1° 5 dB (436 mV) |e Spec. output
level
PEAK LEVEL meter
level
4, PEAK LEVEL meter - MTT-150 RIZ/R22 eA
EQ: METAL, Co(CrO,)
Adjust for 10 kHz to-be the output:
same level as ref. signal MTT-316 R10/R20 Fig. 5-9
(315 Hz)
5. Frequency response | ~~ - ----~~~~----4~-----------}-------- -- =
OUTPUT: At 10 kHz,
, should be 3 dB to 6 d8|
EQ: NORMAL MTT-316 Check higher than measured
in above step.
SPEED: STANDARD and __| Fully-erased tape: OUTPUT:
HIGH (Use bulk tape eraser) {82.48 min. ist0)] Ratio of spec.
6. Signal-to-noise ratio |EQ: METAL . . METAL . fe 55 dB min. (HI) output of
Co(CrO) . .MTT-5061 Check 48 dB min. (STD)| —5 dB to noise
NORMAL )IMTT-501 = 53 aB min, (Ht)
PHONES:
7. Headphone output | conn: Fig, 5-5 MTT-150 Check ~15.8 dB 43 dB 8 ohm load
(89.0 mV to 178 mV)
AC Voltmeter
f=}
0° (IN PHASE) 45° g0° 180°
Fig. 5-4 Confirming phase relationship
DECK under TEST
PHONES
one
Fig. 5-5 Test setup for headphone check

Teac C-3X Specifications

General

Brand	Teac
Model	C-3X
Category	Cassette Player
Language	English