Servo; Reel Torque Offset Adjustment; Tension Offset Current Adjustment - Panasonic AJ-D400P Service Manual

7. Servo

7-1. Reel Torque Offset Adjustment

BOARD Servo
SPEC. 20 ± 2mV
TEST TP301 (S), TP302 (T), TG300 (GND)
ADJUST VR501 (T), VR502 (S)
MODE PLAY
M.EQ Digital Volt Meter
1. Confirm the power off and make a short-circuit
between TP116 and TP505.
2. Turn the power ON and then set the tube* to cover
the sensor LED and place the unit in no tape load-
ing mode.
3. Hold the S-Reel by hand and press the PLAY key.
4. Adjust the VR502 so that the TP301 (S-Reel) is
within specification.
5. Hold the T-Reel by hand and press the PLAY key.
6. Adjust the VR501 so that the TP302 (T-Reel) is
within specification.
7. Make a open-circuit between TP200 and TP505.
<Note>
1. Make a black tube* by yourself.

7-2. Tension Offset Current Adjustment

BOARD Servo
SPEC. 2.5 ± 0.1V
TEST TP402
ADJUST VR402
MODE EJECT
M.EQ
Digital Volt Meter
1. Adjust the VR402 so that the TP402 voltage is
within specification.
7-3. PG Shifter Adjustment
BOARD Servo
SPEC. 126.3 ± 2.5µs
TEST TP113, TP102
ADJUST VR101
MODE PLAY
TAPE Color Bar
M.EQ
Oscilloscope
1. Adjust the VR101 so that the T is within specifica-
tion. (Trigger : TP113)
TP102
Trigger
TP113
(TRIG)
T