Mechanical Adjustments; Electrical Adjustments - Sony TC-WE475 Service Manual

TC-WE475
SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback/erase head
rubber belts
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
Mode Torque meter
Forward CQ-102C
Forward
back CQ-102C
tension
Reverse CQ-102RC
Reverse
back CQ-102RC
tension
FF/REW CQ-201B
8
pinch roller
capstan
Meter reading
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
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)
30 to 65 g • cm
(0.42 to 0.90 oz • inch)
1 to 6 g • cm
(0.014 to 0.083 oz • inch)
70 to 120 g • cm
(0.97 to 1.67 oz • inch)
SECTION 5

ELECTRICAL 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
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–
AF OSC
10 kΩ
attenuator
600 Ω
LINE IN
Standard Input Level
Input terminal
source impedance
input signal level
Standard Output Level
Input terminal
source impedance
input signal level
Test Tape
Tape Contents
P-4-A100 10 kHz, –10 dB
WS-48B 3 kHz, 0 dB
P-4-L300 315 Hz, 0 dB
0 dBs = 0.775 V
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.
: OFF
level meter
47 kΩ
+
set
–
LINE OUT
LINE IN
10 kΩ
0.5 V (–3.8 dBs)
LINE IN
10 kΩ
0.5 V (–3.8 dBs)
Use
Azimuth Adjustment
Tape Speed Adjustment
PB Level Adjustment