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SECTION 5
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Mode: playback
Procedure:
– Normal Speed –
1. Set [REC TIME] 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 –
3. Set [REC TIME] 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) –
Setting:
• Supplied voltage: 2.5 V
• Switch and control position
[VOL ] control (RV101) : mechanical center
[PAUSE ] switch (S105) : OFF
[SPEED CONTROL](RV602): center click
[VOR] switch (S104) : OFF
Test Tape
Record/Playback Head Azimuth Adjustment
Mode: playback
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:
0 dB=0.775 V
Type Signal Used for
P-4-A063 6.3 kHz, –10 dB Head Azimuth Adjustment
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
level mete
r
test tape
P-4-A063
(6.3 kHz, –10 dB)
10 kΩ
set
EAR
j
ack
(
J102
)
+
–
adjustment screw
Press the N
button.
frequency
counter
test tape
WS-48A
(3 kHz, 0 dB)
10 kΩ
EAR jack (J102)
set
+
–
J102 J101
RV601
Tape Speed Adjustment
(Normal Speed)
RV603
Tape Speed Adjustment
(Double Speed)
w
.