Tape Path Alignment; Tape Speed Adjustment - Teac C-1 Service Manual

5-11 TAPE PATH ALIGNMENT
1. Switch on POWER.
2. Install a "mirror-equipped tape path test tape'.
3. Set the deck in the play mode, retracting the record &
playback head manually so that the head does not
contact the tape and causes disturbance for later adjust-
ment.
4. In the play mode, check that both or either pinch roller
guide(s) do not cause tape curling.
5. If the setting is wrong, fine-adjust the height of the take-
up side pinch roller guide until the tape curling stops.
6. Gradually relax the head retraction until the deck is
operating in the normal play mode. Check that the tape
runs normally.
7. If there is tape curling, particularly at the supply side
pinch roller guide, adjust the height of the tape guide
of the REC & PLAY head by slightly turning the height
azimuth screw near the guide (see item 5-10, Fig. 5-20).
Then adjust the height of the take-up side pinch roller
guide (see item 5-10, Fig. 5-18). Note that height adjust-
ment of the supply side pinch roller guide is not per-
missible.
8. Adjust either or both height/azimuth screw(s) so that
the head appears visually parallel to the tape.
Left Hand Erase Oual-gap Right Hand
Pinch Roller Head Record ond Playback Pinch Roller
T-1438-'
*
This diagram shows the head ass'y etc., as reflected by the mirror
of TAPE PATH test cassette.
Fig. 5-21 Tape path diagram
5-12 TAPE SPEED ADJUSTMENT
Specifications:
Tape speed deviation: 3,000 Hz +30 Hz
Tape speed drift: 15 Hz
NOTE: 1. Before performing this adjustment, clean all
parts in the tape path, particularly the capstans,
the pinch rollers and the heads with the appro-
priate liquid from the TEAC TZ-261 cleaner kit
or with pure alcohol.
2. Tape speed setting should be done after approx.
30 seconds of operating time of the deck.
1. Connect test equipment to the deck, as shown in Fig. 5-
22.
2. Set the OUTPUT control on the deck to obtain a suitable
output level.
3. Set the MONITOR switch to TAPE OUTPUT and the EQ
switch to NORMAL.
. Load and play a TEAC MTT-111 test tape (3,000 Hz
signal).
. Check that the PITCH CONT switch knob is pushed in
to prevent it from affecting the tape speed.
. Adjust VRI on the servo amplifier. PC board ass'y for
a reading of 3,000 Hz +5 Hz on the frequency counter,
using an ordinary scerwdriver whose handle is completely
insulated from the screwdriver blade.
. Pull out the PITCH CONT switch knob to the ON posi-
tion.
. Adjust VR2 so that when the knob is centered, that is
at the click point, the reading on the frequency counter
is 3,000 Hz £5 Hz.
. If the tape speed is much out of specification, check the
pinch roller pressure and the tape driving function and
make sure the tape path is clean.
FREQUENCY COUNTER
DECK WOW & FLUTTER METER
under TEST
Fig. 5-22 Tape speed measurement setup
Servo Amplifier PCB Ass'y
Fig. 5-23 Tape speed adj. locations
17