Mitsubishi M-T7100 Service Manual page 11

ELECTRICAL ADJUSTMENT
| 2 | METER SENSITIVITY (OVU)
1. 1 kHz,
EXAMPLE
Set the OSC output control, so ze TAPE SPEED
3150 Hz Test tape
(M61AT751263)
PB
PeN
that the LINE OUT PUT level
METER is lit.
* See Note 2.
_
ae
oN
fe | oy
Lch4 Rch
9 | METAL POSITION VR201 VR201b
FREQUENCY RESPONSE
L METER LEVEL
METAL blank tape, 1kHz, 10kHz,
—26.0dBm.
REC/PB
LINE OUT, VR402
e Connect an AC milli-voltmeter to
LINE OUT.
26.0 +0.3dBm (1kHz, 10kHz)
* See Note 2, 3.
CrO, POSITION
FREQUENCY RESPONSE
CrO, blank tape, 1kHz, 10kHz,
—26.0dBm
REC/PB
LINE OUT, VR401
e Connect an AC milli-voltmeter to
LINE OUT.
M.P.X. FILTER
2 VR402 VR401 oe eee (1kHz, 10kHz) VELA x oe Oe
BIAS(@) (S)BIAS
BIAS DIP POINT VR403 oF ene 4 ee,
NORMAL blank tape. NOR
(Se
OSC t Te
REC
LINE OUT, T402
BIAS had W e d BSI
A
e Connect a Digital DC voltmeter
between TP1 (+), and TP2 (-).
Minimum level.
* Before this adjustment, set
VR403 and VR403b as shown
below.
Lch Rch> an
Lech
VR 102
VR101
LEVEL
&
Lech
VR301
ch
REC
LEVEL
ESR
VR80 1b
METAL blank tape.
REC
P401 pin @, T401
NORMAL blank tape, 1kHz,
10kHz, —26.0dBm.
oh
-26.0 +0.3dBm (1kHz, 10kHz)
* See Note 2, 3
LINE OUT, VR102 (Lch),
VR102b (Rch)
e Connect an AC milli-voltme-
ter to LINE OUT.
-6.0 +0.3dBm
LINE OUT, VR1
e Connect a frequency counter
to LINE OUT.
3150 +5Hz
SYS-CON PCB
VR1
TAPE
0 SPEED
Fig 6-2
4
FRONT
| 4 | 10kHz PB LEVEL
10kHz Test tape
(M61AT750778)
PB
LINE OUT, VR101 (Lch),
VR101b (Rch)
e Connect an AC milli-voltme-
ter to LINE OUT.
-21.0 +0.2dBm
(io [RECESS
NORMAL blank tape, 315Hz,
—6.0dBm.
REC/PB
LINE OUT, VR310 (Lch),
VR301b (Rch)
e Connect an AC milli-voltme-
ter to LINE OUT.
-6.0 +0.2dBm
* See Note 2, 3.
NOTES 1.
2.
All adjustments are without DOLBY, dbx, and MPX FILTER.
Controls Setting:
Output volume: Max, Rec balance: Center click position.
Rec level volume: Max, Bias Adj. volume: Center click position.
. Use the following cassette measuring tape:
NORMAL TAPE
CrO, tape
METAL TAPE
: MAXELL UDI C-—60
: TDK SA C—60
: TDK MA C-—60