Adjustment - Sharp Rt-150H Serviceanleitung

RT-150H &
PEAK LEVEL DISPLAY METER ADJUSTMENT
1. Connect instruments as shown in Figure 8-1.
2. Turn off the Dolby NR switch. |
3. Load the unit with a normal tape, and place it in record
mode. Then adjust the record-level controls VR102 and
V R202 so that the electronic voltmeter reads 580mV.
4. Watching the peak level display meter, check that the
segment OdB lights up with the input signal. If the segment
OdB does not light up, perform readjustment following
Table 8-1.
Segment indication Adjustment
Table 8-1
0 dB segment doesn't iight up Remove R603 and R607.
The segments up to +1dB light up. | Remove R601 and R605.
Line in J4-A (L-ch) TP102 (L-ch) Electronic
J4-B (R-ch) TP202 (R-ch) Voltmeter
Record
CR oscillator Attenuator
1kHz; 316mV |
(~10dBV)
Figure 8-1
MECHANICAL ADJUSTMENT
PINCH ROLLER PRESSURE ADJUSTMENT
(See Figure 8-2)
1. Set the unit in the playback mode.
2. Press the tension gauge — which is graduated from 0 to
500g — onto part of the pinch roller to let it leave the
capstan. Then return the tension gauge slowly and take its
reading when the pinch roller touches the capstan or begins
to rotate again. The reading should be 350 to 420 g.
3. If the reading is not within 350 to 420 g, adjust the pinch |
roller by bending the pinch roller press spring or replace it.
in Table 8-2,
TAPE SPEED ADJUSTMENT (See Figure 8-3)
1. Connect the frequency counter to the unit as shown in
Figure 8-3.
2. Load the unit with a test tape (TEAC MTT-111, 3 kHz-
recorded tape) and play its intermediate area. |
3. Then adjust the variabie resistor inserting a high-frequency
adjustment bladed screwdriver through the adjustment hole
at the bottom of the motor so that the frequency counter
reads 2960 to 3000 Hz. |
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
1. Connect instruments as shown in Figure 8-4.
2. Set the tape selector switch at normal position.
3. Put a test tape (TEAC, MTT-114, 10kHz, 250 pWb/mm,
—10 dB prerecorded) into the unit and play it.
4. Adjust the head azimuth adjusting screw so that the elec-
tronic voltmeter reading is maximal.
Note: | |
if a dual-trace oscilloscope is available, perform the adjust-
ment so that the reading of the oscilloscope is maximal and
with the teast phase/output difference between channels.
After the work, check that the head azimuth adjusting screw
has been secured completely. |
Capstan
e Tension Gauge
=
- Pinch Roller % /
Pinch Roller
Pressure Spring
"want 36 eo een
— TW-2231 90 ~— 135 g-cm
TW-2231 90 — 135 g-cm
| Table 8-2.
REC/PB
head.
Test tape
MTT-111]— 7 £
—
Figure 8-2
Torque measurement
cassetie
Line out J4-C (L-ch)
Line out J4-D (R-ch)
Figure 8-3
Dual-trace
oscilloscope
Test tape
MTT-114
10 kHz
250 pWb/
TP103 (L-ch)
Figure 8-4
=.