21
SECTION 5
ELECTRICAL ADJUSTMENTS
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:
Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
0 dB = 0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit ad-
justment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Tape
Signal
Used for
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
Level Adjustment
DECK A/B
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback
set
main board
CN301B
Pin
qs
(L-CH)
Pin
qa
(R-CH)
main board
CN301B
Pin
0
(GND)
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN301B
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin
qa
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
pin
0
pin
qs
L
R
Содержание HCD-M100
Страница 7: ...7 This section is extracted from instruction manual ...
Страница 31: ...HCD M100 M300AV 31 31 6 6 SCHEMATIC DIAGRAM CD MOTOR SECTION CD 36 36 36 36 09 ...
Страница 33: ...HCD M100 M300AV 33 33 6 8 SCHEMATIC DIAGRAM AUDIO SECTION See page 56 for IC Block Diagrams ...
Страница 40: ...HCD M100 M300AV 40 40 6 15 SCHEMATIC DIAGRAM MAIN 6 6 SECTION See page 32 for Printed Wiring Board ...
Страница 45: ...HCD M100 M300AV 45 45 6 21 SCHEMATIC DIAGRAM FRONT AMP SECTION ...
Страница 46: ...HCD M100 M300AV 46 46 6 22 SCHEMATIC DIAGRAM REAR AMP SECTION HCD M300AV ONLY ...