12
SECTION 6
ELECTRICAL ADJUSTMENTS
Note: The adjustments should be performed in the order given in the ser-
vice manual. As a rule, adjustments about playback should be per-
formed before those about recording.
The adjustments should be performed for both L-CH and R-CH.
• Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR, MPX FILTER switch: OFF
DIRECTION MODE switch: g
• Standard Record:
Deliver the standard input signal level to the input jack and set
the [REC LEVEL] volume to obtain the standard output signal
level as follows.
– Record Mode –
Standard Input Level
input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (–3.8 dB)
Standard Output Level
output terminal LINE OUT
load impedance 47 kΩ
output signal level 0.5 V (–3.8 dB)
Test Tape
Type Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
P-4-L300 315 Hz, 0 dB Playback Level Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
Test Mode
1. While pressing two buttons of [ARL] and [REC MUTING ],
press the [POWER] button to turn the power on.
2. All segments of the fluorescent indicator tube are light up for
about one second, and the test mode is set.
The test mode has a special function as bellow.
• Counter RESET & MEMORY Function
(1) Press the [RESET] button to reset the counter.
(2) Press the [REC ] button then the H button to starts
recording.
(3) After record, press the x button to stop recording.
(4) Press the m button to rewind the tape.
(5) Rewinding tape is automatically stopped at the point
where recording was started.
3. To release the test mode, press the [POWER] button to turn
the power off.
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: FWD playback
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
3. Phase Check
Mode: playback
4. Change the REV playback mode and repeat the steps 1 to 3.
(TC-RE340 only)
5. After the adjustment, lock the screw with locking compound.
Adjustment Location: record/playback head (See page 13)
Screw
position
L-CH
peak
within
1dB
output
level
L-CH peak
R-CH peak
within
1dB
angl
R-CH
peak
+
–
V
H
+
–
Screen pattern
Good Wrong
in phase 45
°
90
°
135
°
180
°
LINE OUT jack (J301)
set
R-CH
L-CH
47 k
Ω
47 k
Ω
oscilloscope
test tape
P-4-A100
(10 kHz, –10 dB)
0 dB=0.775 V
+
–
set
47 k
Ω
LINE OUT
jack
LINE IN
jack
600
Ω
10 k
Ω
attenuator
AF OSC
level meter
J301
W
z
+
–
set
47 k
Ω
LINE OUT jack (J301)
level meter
Test tape
P-4-A100
(10 kHz, –10 dB)
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
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m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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