Onkyo TA-RW111 - Adjustment Procedures; Precautions; Test Equipment;Tools Required; Tape Speed Adjustment

TA-RW111
ADJUSTMENT PROCEDURES
PRECAUTIONS
1. Before adjustment, clean the following parts with an
alchol moistend swab.
* record/ playback head * erase head
* pinch roller * capstan
2. Do not use magnetized screwdriver for adjustmenis.
3. Demagnetize record/ playback head with a liead de-
magnetizer.
Tape speed adjustment
TEST EQUIPMENT / TOOLS REQUIRED:
Audio oscillator
Digital frequency counter
Oscilloscope
Attenuator
AC voltmeter
Non-magnetic screwdriver
Test tapes
TCC-153 10kHz, —15dB
MTT-II11 :3kHz, —10dB
MTT-150 :Dolby level calibration
400Hz, tone 200nWb/m
Connect the digital frequency counter to the line output terminal.
Load the test tape MTT-111 into the cassette holder.
Connect the test point TP-2 to the ground to be the unit to adjustment mode.
Press the forward play button. (The unit becomes the high speed. )
Adjust the trim resistors R802(Deck A) and R817(Deck B) so that the frequency counter reading becomes 6000Hz to 6020Hz.
Press the forward play button. (The unit becomes the normal speed. }
Adjust the trim resistors R803(Deck A) and R818(Deck B) so that the frequency counter reading becomes 3000Hz to 3010Hz.
Item Connection of Line input | Test tape} Mode , Output Adjustment Adjust
instrument indicator point
4 —>——— um i i ——_ _ ccm + —s
AC voltmeter
ue
.
Maximum
and
Head and oscillo- | AC Head azimuth h
1 eae scope to TCC-153 | PB voltmeter | 05 2414 Same phase
azimuth LINE output Oscilloscope | @ore™ at channels
+ OurpO Ns coP LandR
terminal
+
]DECK
A
_| AC voltmeter R117 (ch. L)
2 |) LayPack | +5 terminals MTT-150|PB AC Rek Be
level voltmeter | DECK B
TP R119 (ch. L)
R120 (ch. R)
B; Frequency METAL Fre
3p oy| Counter to TAPE |REC vee | b-403 85kHz+ 2kHz
requency| 1549 XS-C90 counter
Repeat the
recording
IkHz, — 23dB Same level and play back
4 [Bias fig-2 and Gog (REC/PBIAG oe Ri at 1kHz and | until the 1kHz and
" 12kHz, - 23dB 12kHz 12kHz playback
signals are same
level.
REC AC Attenuator or 350mV
Record . UD-1 voltmeter | AF OSC output
bs) fig-2 1kHz
level C-90 REC Ppl AC R219 (ch. L) | Same level
voltmeter | R220 (ch. R) at REC/PB
Blank tape NORMAL :::::: UD-1 C-90 PLAY torque-:::+++++*: 30-- 70g // em
HIGH «+ ++++e ++ XL-II C-90 FF. REW torque :::::80~-180¢// cm
METAL-::::---:- XS C-60 Back tention --++-++++"++°- 6~12¢ 7 cm