Sony TCW-E475, Руководство по обслуживанию

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8
TC-WE475
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback/erase head pinch roller
rubber belts capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustment.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustments and measurement should be performed for both
L-CH and R-CH.
• Switch position
DOLBY NR switch : OFF
DIRECTION MODE switch : g
• Standard record position :
Deliver the standard input signal level to input jack and set the
REC LEVEL knob to obtain the standard output signal level
as follows.
– Record Mode–
0 dBs = 0.775 V
Standard Input Level
Test Mode
1. While pressing the H (DECK A) and REC MUTING W
buttons with the power off, press the
!
button to turn on the
power. The fluorescent display tube lights up for about one sec-
ond, and the test mode is set. The test mode performs the fol-
lowing two special functions.
• Playback speed switching function
Pressing the HIGH/NORMAL button switches the playback
speed between standard/double speed.
• Counter RESET & MEMORY function
Resets the counter when recording starts. When rewound with
the
m
(AMS) button after recording, stops at the point where
recording started.
2. To release the test mode, turn OFF the power switch.
Mode Torque meter Meter reading
Forward CQ-102C
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
Forward
back
tension
CQ-102C
DECK A : 1 to 6 g • cm
(0.014 to 0.083 oz • inch)
DECK B : 2 to 9 g • cm
(0.028 to 0.125 oz • inch)
Reverse CQ-102RC
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
Reverse
back
tension
CQ-102RC
1 to 6 g • cm
(0.014 to 0.083 oz • inch)
FF/REW
CQ-201B
70 to 120 g • cm
(0.97 to 1.67 oz • inch)
set
–
+
AF OSC
attenuator
10 k
Ω
600
Ω
LINE IN
level meter
LINE OUT
47 k
Ω
Standard Output Level
Test Tape
Input terminal LINE IN
source impedance 10 k
Ω
input signal level 0.5 V (–3.8 dBs)
Tape Contents Use
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB PB Level Adjustment
Input terminal LINE IN
source impedance 10 k
Ω
input signal level 0.5 V (–3.8 dBs)