Sony WE475 Service Manual - Page 9

Record/Playback Head Azimuth Adjustment, DECK A, DECK B, Tape speed Adjustment, Sample value of wow - tc b

Get Sony WE475 - TC Dual Cassette Deck PDF manuals and user guides
UPC - 027242584419
View all Sony WE475 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 9 highlights

TC-WE475 Record/Playback Head Azimuth Adjustment DECK A Procedure: 1. Forward Playback Mode DECK B test tape P-4-A100 (10 kHz, -10 dB) level meter 47 kΩ set LINE OUT 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. L-CH peak output within level 1 dB within 1 dB screw position R-CH peak L-CH peak R-CH peak screw position 3. Playback Mode test tape P-4-A100 (10 kHz, -10 dB) L-CH 47 kΩ oscilloscope VH set R-CH 47 kΩ LINE OUT Screen Pattern In phase 45˚ good 90˚ 135˚ 180˚ wrong 4. Change the reverse playback mode and repeat the steps 1 to 3. 5. After the adjustment, lock the adjustment screws with suitable locking compound. Adjustment Location: - record/playback head - reverse side forward side adjustment screws Tape speed Adjustment Adjust DECK A first Procedure: - Forward Playback Mode - DECK A DECK B test tape WS-48B (3 kHz, 0 dB) frequency counter 47 kΩ set LINE OUT (High speed adjustment) 1. Press the PITCH CONTROL button to set to OFF . 2. Set to test mode. (Refer to page 11.) 3. Press the H button to playback. 4. Press the HIGH/NORMAL button to playback at double speed. 5. Adjust RV316 (DECK A), RV416 (DECK B) so that the fre- quency counter reading becomes 5,980 ± 180 Hz. (Normal speed adjustment) 6. Press the H button to playback. 7. Press the HIGH/NORMAL button to playback at normal speed. 8. Adjust RV317 (DECK A), RV417 (DECK B) so that the fre- quency counter reading becomes 3,000 ± 90 Hz. (Pitch control adjustment) (DECK A) 9. Press the PITCH CONTROL button to set to ON . 10. Set PITCH CONTROL knob to mechanical center. 11. Press the H button to playback. 12. Adjust RV318 so that the frequency counter reading becomes 2,990 ± 90 Hz. Adjustment Location: MAIN board (See page 14.) Sample value of wow and flutter W.RMS (JIS) less than 0.3% . (test tape : WS-48B) Playback Level Adjustment Procedure: - Forward Playback Mode - DECK A DECK B test tape P-4-L300 (315 Hz, 0 dB) level meter 47 kΩ set LINE OUT Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and DECK B : RV121 (L-CH), RV221 (R-CH) so the level meter reading becomes the adjustment limits below. Adjustment Value: LINE OUT level : -7.7 dBs ± 0.5 dB (0.301 to 0.338 V) Level difference between channels : within 0.5 dB Confirm that the LINE OUT level does not change in playback mode while changing the mode from playback to stop several times. Adjustment Location: MAIN board (See page 14.) 9

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
9
TC-WE475
Record/Playback Head Azimuth Adjustment
DECK A
DECK B
Procedure:
1.
Forward Playback Mode
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.
Playback Mode
4.
Change the reverse playback mode and repeat the steps 1 to 3.
5.
After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location:
– record/playback head –
Tape speed Adjustment
DECK A
DECK B
Adjust DECK A first
Procedure:
– Forward Playback Mode –
(High speed adjustment)
1.
Press the
PITCH CONTROL
button to set to
OFF .
2.
Set to test mode. (Refer to page 11.)
3.
Press the
H
button to playback.
4.
Press the
HIGH/NORMAL
button to playback at double speed.
5.
Adjust RV316 (DECK A), RV416 (DECK B) so that the fre-
quency counter reading becomes 5,980 ± 180 Hz.
(Normal speed adjustment)
6.
Press the
H
button to playback.
7.
Press the
HIGH/NORMAL
button to playback at normal speed.
8.
Adjust RV317 (DECK A), RV417 (DECK B) so that the fre-
quency counter reading becomes 3,000 ± 90 Hz.
(Pitch control adjustment) (DECK A)
9.
Press the
PITCH CONTROL
button to set to
ON .
10. Set
PITCH CONTROL
knob to mechanical center.
11. Press the
H
button to playback.
12. Adjust RV318 so that the frequency counter reading becomes
2,990 ± 90 Hz.
Adjustment Location:
MAIN board (See page 14.)
Sample value of wow and flutter
W.RMS (JIS) less than 0.3% .
(test tape : WS-48B)
Playback Level Adjustment
DECK A
DECK B
Procedure:
– Forward Playback Mode –
Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and
DECK B : RV121 (L-CH), RV221 (R-CH) so the level meter read-
ing becomes the adjustment limits below.
Adjustment Value:
LINE OUT level : –7.7 dBs ± 0.5 dB (0.301 to 0.338 V)
Level difference between channels : within 0.5 dB
Confirm that the LINE OUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location:
MAIN board (See page 14.)
set
test tape
P-4-A100
(10 kHz, –10 dB)
level meter
LINE OUT
47 k
Ω
within
1 dB
within
1 dB
output
level
R-CH
peak
R-CH
peak
L-CH
peak
L-CH
peak
screw
position
screw position
V
H
Screen Pattern
set
In phase
45˚
90˚
135˚
180˚
good
wrong
47 k
Ω
47 k
Ω
L-CH
R-CH
test tape
P-4-A100
(10 kHz, –10 dB)
LINE OUT
oscilloscope
forward side
reverse side
adjustment screws
set
frequency counter
47 k
Ω
LINE OUT
test tape
WS-48B
(3 kHz, 0 dB)
set
test tape
P-4-L300
(315 Hz, 0 dB)
level meter
LINE OUT
47 k
Ω