Sony HCD-EH10 Service Manual page 12

HCD-EH10
DECK SECTION 0 dB=0.775 V
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
• Test Tape
Tape Signal
P-4-A063 6.3 kHz, -10 dB
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
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
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.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
L-CH
peak
3. Mode: Playback
test tape
MAIN board
P-4-A063
PHONES jack
(6.3 kHz, –10 dB)
(J102)
set
waveform of oscilloscope
in phase 45 °
good
12
Used for
Azimuth Adjustment
MAIN board
PHONES jack
(J102)
level meter
+
–
within
1dB
Screw
position
R-CH
peak
oscilloscope
V H
90 ° 135 ° 180 °
wrong
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 –
mechanical deck
(H-21SB)