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15
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
3. Mode: Playback
Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the speed will switch to double speed or
normal speed each time the HI-SPEED DUB button is pressed.
Procedure:
With the power turned ON, press the
c
/CLOCK SET button,
ENTER button, and DISC 3 button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the
"/1
button.
1. Insert the WS-48B into deck B.
2. Press the
H
button of deck B.
3. Press the HI-SPEED DUB button and play the tape at double speed.
4. Adjust RV1001 of the LEAF SW board so that the reading of
the frequency counter becomes 6000 ± 180 Hz.
5. Press the HI-SPEED DUB button and play the tape at normal speed.
6. Adjust RV1002 of the LEAF SW board so that the reading of
the frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: LEAF SW board
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:
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN301 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
Adjustment Location
[LEAF SW BOARD]
test tape
P-4-A100
(10kHz, –10dB)
oscilloscope
set
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
Pin
2
(GND)
main board
CN301
Pin
3
(L-ch)
Pin
1
(R-ch)
L
R
Reverse
Foward
Remove the cassette lid.
test tape
P-4-L300
(315Hz, 0dB)
level meter
set
main board
CN301
Pin
1
(R-ch)
Pin
3
(L-ch)
RV1002
RV1001
RV1002(Normal Speed)
RV1001(High Speed)
Содержание LBT-LX7
Страница 30: ...HCD LX7 LX8 29 29 6 6 SCHEMATIC DIAGRAM MAIN 1 3 SECTION See page 50 for IC Block Diagrams MICON INTERFACE ...
Страница 32: ...HCD LX7 LX8 31 31 6 8 SCHEMATIC DIAGRAM MAIN 3 3 SECTION See page 28 for Printed Wiring Board ...
Страница 33: ...HCD LX7 LX8 32 32 6 9 SCHEMATIC DIAGRAM DECK SECTION Page 30 ...
Страница 34: ...HCD LX7 LX8 33 33 6 10 PRINTED WIRING BOARD DECK SECTION See page 17 for Circuit Boards Location Page 28 ...
Страница 35: ...HCD LX7 LX8 34 34 6 11 SCHEMATIC DIAGRAM POWER SECTION ...
Страница 39: ...HCD LX7 LX8 38 38 6 15 SCHEMATIC DIAGRAM PANEL VR SECTION See page 50 for IC Block Diagrams ...
Страница 41: ...HCD LX7 LX8 40 40 6 17 SCHEMATIC DIAGRAM TC PANEL SECTION ...
Страница 42: ...HCD LX7 LX8 41 41 6 18 PRINTED WIRING BOARD TC PANEL SECTION See page 17 for Circuit Boards Location ...
Страница 43: ...HCD LX7 LX8 42 42 6 19 SCHEMATIC DIAGRAM CD PANEL SECTION ...
Страница 44: ...HCD LX7 LX8 43 43 6 20 PRINTED WIRING BOARD CD PANEL SECTION See page 17 for Circuit Boards Location ...
Страница 45: ...HCD LX7 LX8 44 44 6 21 SCHEMATIC DIAGRAM CD MOTOR SECTION Page 30 ...
Страница 46: ...HCD LX7 LX8 45 45 6 22 PRINTED WIRING BOARD CD MOTOR SECTION See page 17 for Circuit Boards Location Page 28 ...
Страница 47: ...HCD LX7 LX8 46 46 6 23 SCHEMATIC DIAGRAM TRANS SECTION LX7 model ...
Страница 48: ...HCD LX7 LX8 47 47 6 24 PRINTED WIRING BOARD TRANS SECTION LX7 model See page 17 for Circuit Boards Location ...
Страница 49: ...HCD LX7 LX8 48 48 6 25 SCHEMATIC DIAGRAM TRANS SECTION LX8 model ...