2-1. Dial Pulse Adjustment (PTC-69 Board)
Adjustment (Check)After Completing Adjustment (Check)
1. Connect the oscilloscopeOs CH-1 input as follows:1. Turn off the POWER switch.
X:Pin 2 of CN2 (soldered test terminal)2. Unsolder and remove the three test terminals from
G:Pin 6 of CN2 (soldered test terminal)CN2 on the PTC-69 board.
2. During turn the search dial at uniform speed and3. Remove the screw securing the PTC-69 board, then
reverse direction (3), adjust the sweep time on thesecure the PTC-69 board and PTC protector with
oscilloscope to align the 1 cycle waveform to 8removed screw.
divisions width.4. Hook the harness that connected to the control panel
3. During turn the search dial at the same as step 2, checkassembly.
that the duty ratio on waveform satisfies the5. Remove the dial rubber and dial knob from the search
specification. If the specification is not satisfied,dial assembly.
perform the adjustment.6. Install the search dial assembly to the control panel
Adj. point:1RV1/PTC-69 (inside RV)assembly.
Specification: Duty ratio 0.50 ?0.047. Attach the panel on the control panel assembly.
(A = 4.0 ?0.3 divisions width)8. Attach the dial knob and dial rubber.
4. Connect the oscilloscopeOs 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, check
that the duty ratio on waveform satisfies the
specification. If the specification is not satisfied,
perform the adjustment.
Adj. point:1RV2/PTC-69 (outside RV)
Specification: Duty ratio 0.50 ?0.04
(A = 4.0 ?0.3 divisions width)
Adjust eight divisions in width
Center of jitter
A
Waveform on Oscilloscope
2-2 (E)BKNW-119/120/121/122/123 |
ACEC
