Mechanical Adjustments; Electrical Adjustments - Sony TC-WE675 Service Manual

TC-WE675
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/FRONT (DECK A) and REC MUT-
ING W buttons with the power off, press the ! button to turn
on the power. The fluorescent display tube lights up for about
one second, and the test mode is set. The test mode performs the
following 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