Electrical Adjustments - Sony TCM-23DV Operating Instructions (primary manual) Service Manual

Setting:
• Supplied voltage: 2.5 V
• Switch and control position
[VOL ]
w control (RV101)
[PAUSE ]
switch (S105) : OFF
.
[SPEED CONTROL]
(RV602): center click
[VOR]
switch (S104)
Test Tape
Type Signal
P-4-A063 6.3 kHz, –10 dB
WS-48A 3 kHz, 0 dB
0 dB=0.775 V
Record/Playback Head Azimuth Adjustment
Mode: playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
Procedure:
1. Turn the adjustment screw to obtain the maximum reading on
level meter.
Note: Several peaks may appear, but take the maximum.
2. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location:
adjustment screw
Press the N
button.
SECTION 5

ELECTRICAL ADJUSTMENTS

: mechanical center
: OFF
Used for
Head Azimuth Adjustment
Tape Speed Adjustment
level meter
10 k
+
–
EAR jack (J102)
Tape Speed Adjustment
Mode: playback
test tape
WS-48A
(3 kHz, 0 dB)
Procedure:
– Normal Speed –
[REC TIME]
1. Set switch (S601) to NORMAL (4.8 cm/s) posi-
tion, and playback the tape (WS-48A) .
2. Adjust RV601 so that frequency counter reading becomes 3,040
Hz.
Specification values: 3,030 to 3,050 Hz
– Double Speed –
[REC TIME]
3. Set switch (S601) to DOUBLE (2.4 cm/s) posi-
tion.
4. Playback the tape from the beginning for two minutes, then
adjust RV603 so that frequency counter reading becomes 1,540
Hz.
Specification values: 1,535 to 1,545 Hz
Confirm that deflection of the frequency counter reading between
the beginning and the end of tape is within 1% (NORMAL: approx.
30.4 Hz, DOUBLE: approx. 15.4 Hz) .
Adjustment Location:
– MAIN BOARD (Conductor Side) –
J102
RV603
Tape Speed Adjustment
(Double Speed)
– 8 –
frequency
counter
10 k
+
set
–
EAR jack (J102)
J101
RV601
Tape Speed Adjustment
(Normal Speed)