Dial Pulse Adjustment (Ptc-69 Board) - Sony DNW-A100 Maintenance Manual

3-2. Dial Pulse Adjustment (PTC-69 Board)

3-2. Dial Pulse Adjustment
(PTC-69 Board)
When the PTC-69 board was replaced or the dial pulse
generating circuit on the PTC-69 board was repaired,
perform the dial pulse adjustment.
n
Be sure to perform the adjustments with the search dial
assembly separated from the lower control panel assembly.
When uniting both assemblies, remove the search dial
assembly from the lower control panel assembly as
follows:
1. Remove a panel from the lower control panel assem-
bly. (Refer to Section 2-3-2 of the maintenance
manual part 1.)
2. Remove the dial rubber, dial knob, and search dial
assembly from the lower control panel assembly.
(Refer to the exploded views in Section 2 of the
maintenance manual part 2, volume-2.)
3. Disconnect the harness from CN69 on the KY-364
board of the lower control panel assembly.
Hook
Harness
Test terminals
3-4
Search dial assembly
PTC-69 board
BVTP3 x 8
PTC protecter
Preparation
Tools List
. Oscilloscope: TEKTRONIX 2465B or equivalent
. Solder iron
. Test terminals, such as covered wire (3 pieces)
Preparation
1. Remove the PTC protector after removing a screw.
2. Solder the three test terminals to the connector CN2's
pins 2, 3 and 6 on side B of the PTC-69 board.
3. Fix the PTC-69 board with a screw that is removed at
step 1 (without the PTC protector).
4. Attach the dial knob and dial rubber to the search dial
assembly.
5. When the PTC-69 board is replaced, set RV1 and RV2
to the mechanical center.
When the potentiometer RV1 or RV2 is replaced, set it
(RV1 or RV2) to the mechanical center.
6. Connect the harness to CN69 of the KY-364 board
with this harness unhooked.
7. Turn on the POWER switch after connecting the
power cord.
8. To turn the search dial to JOG mode, press the JOG
button.
PWH2.6 x 5
PTC-69 board
Dial rubber
Dial knob
RV1
RV2
Mechanical center
DNW-A100/A50/A45
DNW-A100P/A50P/A45P