Sony BVU-950 - Page 67

10-6. DT SERVO ADJUSTMENT
10-6-1. Hysteresis Cancel Level Tentative Adjustment
machine conditions
for adjustment
spec.
adjustment
* Disconnect 8-pin connecter on
brush-board of upper drum
¢ $201/DT-21(B8-1): No. 1,2 ON
«STOP mode
- After step 1, press the S202 on
the DT-21 board (C1).
Check that the 0102 (Hysteresis
Cancel! mode famp) on the
DT-21 board lights.
- After the adjustment is compiet-
ed, set the all S201 to OFF, and
connect &pin connecter to the
brush-board of the upper drum.
Step 1.
CH-A: TP401/DT-21(H-4)
CH-B: TP402/DT-21(H-4)
DC level=0+0.1 Vdc
CH-A; @ RV305/DT-21(G-1)
CH-B; @ RV306/DT-21(G-4)
Step 2. @RV101/DT-21(E-2)
TP401 /DT-21(H-4)
A
GNO level
A=18025V
Step 3. Q@RV401/DT-21(F-3)
TP401 /DT-21(H-4)
/ \
A=170t5V
Step 4.
CH-A; TP401/DT-21(H-4)
CH-B: TP402/DT-21(H-4)
GND level
A=140£5V
CH-A: @RV101/DT-21(E-2)
CH-B: @ RV102/DT-21(E-2)
7-6