ADJUSTMENT
As for preparation for adjustment, adjusting method and re-
placement of pickup refer to the relevant explanation in Service
Manual “ADJUSTMENT PROCEDURES OF AUDIO
PRO-
MECHANISM
SECTION
l
Driving Force Check
Torque Meter
Specified Value
Tape 1
Play: TW-2412
Over
50 g
Tape 2
’
Over 60 g
Reverse Play: TW-2422
Over 50 g
Over 60 g
l
Torque Check
Torque Meter
Specified Value
Tape 1
Tape 2
Play: TW-2111
27 to 60
gem
27 to 60 g.cm
Reverse Play: TW-2121
27 to 60
gem
27 to 60 g.cm
Fast Forward: TW-2231
55 to 120
gem
55 to 120 g.cm
Rewind: TW-2231
55 to 120 g.cm 55 to 120
gem
l
Head Azimuth
Test Tape Instrument Connection
MTT-114
Headphones socket
(Load resistance: 32 ohms)
l
Tape Speed
Test Tape Adjusting Specified Instrument
i
Point
Value
Connection
High
Ml-T-1 11
Tape1 :
6,000
i
Speaker
speed*
VR404 100 Hz
terminal (Load
Tape2: resistance: 6
j
VR402 ohms)
Normal
MTT-111
Tape1 :
3,000
+
speed
VR401
i
60 Hz
i
Tape2:
1
VR403
*Short TP402 @ and TP402
0
when performing the high speed
adjustment.
TAPE
SECTION
!
L
Position of each switch or control
Volume Max
Graphic Equalizer Center
Function
Tape
Dolby NR
Off
Beat cancel
A
Tape selector
Normal
Dubbing speed
Normal
l
Bias Frequency
Adjusting
Specified Value Instrument
Point
!
Connection
L411
100
kHz
Q421 Emitter
/
(BEAT CANCEL Switch : A)
l
Bias Current
1
Adjusting Point
Specified Value Instrument
’
Connection
L: VR407
Normal: 20
i
3 V
L: Pin 1 of
CNP404*
R: VR408
PI:
Pin 5 of
GNP404
l
Erase Current Check
Resistor for measurement:
1 ohm
Specified Value
30i7mV
l
Playback Amplifier Sensitivity
r
Tast Tape
Adjusting
Specified
Point
Value
Instrument Connection
1
t
MT-T-1 50
L: VR405
1
R:
VP,406
Normal:
L: Pin3 of TP401
560
mV
R:
Pin1
of TP401
l
Record /Playback Sensitivity (Tape 2)
Test Tape: UR-121
Input Level Adjusting
Specified
Instrument Connection
Point
Value
l
1
L: VR409
Ret
Level: Input: AuxAIideo
R: VR410 103
mV Output: TP401
* 1: Adjust the oscillator so that TP401 output is 103 mV in the
recording mode.
l
Playback Amplifier Sensitivity Check
Test Tape
1
Specified
Instrument
Value
Connection
2.7 V
+
3dB Speaker terminal
(Load resistance:6 ohms)
Figure 18 ADJUSTMENT POINTS
-
18-
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