Sony TXD-RE210 Service Manual page 8

3. Playback Mode
test tape
P-4A100
(10kHz, –10dB)
L-CH
set
R-CH
screen pattern
in phase 45 °
good
4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location :
– record/playback head –
forward side
adjustment screws
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48B
(3kHz, 0dB)
set
1. Set to forward playback mode.
2. Adjust RV71 so that frequency reading becomes 3,000± 90Hz.
Frequency difference between the beginning and the end of the tape
should be within ± 3%.
Adjustment Location : AUDIO board.
(see page 9)
Osilloscope
47 k Ω
V H
47 k Ω
TAPE OUT
90 ° 135 ° 180 °
wrong
revers side
frequency counter
47 k Ω
+
–
TAPE OUT
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape : WS-48B)
Playback Level Adjustment
Procedure :
Mode : Playback
test tape
P-4-L300
(315Hz, 0dB)
set
Adjust RV11 (L-CH) and RV21 (R-CH) so the level meter reading
becomes the adjustment limits below.
Adjustment Level :
TAPE OUT level : – 7.7± 0.5dB (0.301 to 0.338V)
Level Difference between Channels : within 0.5dB
Confirm the TAPE OUT level does not change in playback mode
while changing the mode from playback to stop several times.
Adjustment Location : AUDIO board.
Record Bias Adjustment
Procedure :
1. Mode : Record
AF OSC
1) 315Hz
2) 10kHz
attenuator
600 Ω
2. Mode : Playback
recorded
portion
set
3. Confirm playback the signal recorded in step 1 become adjust-
ment level as follows.
4. If these levels do not adjustment level, adjust the RV12
(L-CH) and RV22 (R-CH) to repeat step 1 and 4.
Adjustment level : Playback output of 315Hz to playback output
of 10kHz : ±0.5dB.
Adjustment Location : AUDIO board.
– 8 –
level meter
47 k Ω
+
–
TAPE OUT
(see page 9)
72.3mV (–20.6dB)
blank tape
CS-123
10 k Ω
set
TAPE IN
level meter
47 k Ω
+
–
TAPE OUT