Sony DNW-A100 Maintenance Manual page 41

Adjustment (Check)
1. Connect the oscilloscope's CH-1 input as follows:
X: Pin 2 of CN2 (soldered test terminal)
G: Pin 6 of CN2 (soldered test terminal)
2. During turn the search dial at uniform speed and
reverse direction (3), adjust the sweep time on the
oscilloscope to align the 1 cycle waveform to 8
divisions width.
3. During turn the search dial at the same as step 2,
checks that the duty ratio on waveform satisfy the
specification. If the specification is not satisfied,
perform the adjustment.
1RV1/PTC-69 (inside RV)
Adj. point:
Specification: Duty ratio 0.50 ± 0.04
(A = 4.0 ± 0.3 divisions width)
4. Connect the oscilloscope's CH-1 input as follows:
X: Pin 3 of CN2 (soldered test terminal)
G: Pin 6 of CN2 (soldered test terminal)
5. During turn the search dial at uniform speed and
forward direction (2), adjust the sweep time on the
oscilloscope to align the 1 cycle waveform to 8
divisions width.
6. During turn the search dial at the same as step 5,
checks that the duty ratio on waveform satisfy the
specification. If the specification is not satisfied,
perform the adjustment.
1RV2/PTC-69 (outside RV)
Adj. point:
Specification: Duty ratio 0.50 ± 0.04
(A = 4.0 ± 0.3 divisions width)
Adjust eight divisions in width
A
Waveform on Oscilloscope
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
Perfection
1. Turn off the POWER switch.
2. Unsolder and remove the three test terminals from
CN2 on the PTC-69 board.
3. Remove a screw fixing the PTC-69 board, then fix the
PTC-69 board and PTC protector with removed screw.
4. Hook the harness that connected to the lower control
panel assembly.
5. Remove the dial rubber and dial knob from the search
dial assembly.
6. Reinstall the search dial assembly to the lower control
panel assembly.
7. Reattach the panel on the lower control panel assem-
bly.
8. Reattach the dial knob and dial rubber.
Center of jitter
3-2. Dial Pulse Adjustment (PTC-69 Board)
3-5