Service manual

12
HCD-EH10
0 dB=0.775 VDECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
• Test Tape
Tape Signal Used for
P-4-A063 6.3 kHz, -10 dB Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Note: Remove the sheet (azimuth) before this adjustment.
After the end of adjustment, try to paste sheet (azimuth) peeled off
to be the same position.
Adjust the tape mechanism deck detaching it from the set when there
is no hole for the azimuth adjustment in the set.
Procedure:
1. Mode: Playback
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 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
– When there is a hole for the azimuth adjustment –
– When there is no hole for the azimuth adjustment –
set
test tape
P-4-A063
(6.3 kHz, –10 dB)
oscilloscope
V
H
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good
wrong
MAIN board
PHONES jack
(J102)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
set
MAIN board
PHONES jack
(J102)
+
–
level mete
r
test tape
P-4-A063
(6.3 kHz, –10 dB)
mechanical dec
k
(H-21SB)