At Head Head-To-Tape Contact Check And Adjustment - Sony DNW-A100 Maintenance Manual

7-1-8. AT Head Head-to-tape Contact Check and Adjustment

Note
The AT head head-to-tape contact adjustment is closely related to the head position
adjustment, head height adjustment, and head azimuth adjustment.
Be sure to perform adjustments (or checks) according to "In case the adjustment is
performed" in this section when the AT head head-to-tape contact is adjusted.
Tools
. Alignment tape CR8-1A (For DNW-A100/A50/A45):
. Alignment tape CR8-1A PS (For DNW-A100P/A50P/A45P): 8-960-098-45
. Oscilloscope (Tektronix 2465B or equivalent)
. Torque screwdriver (6 kgf.cm) (JB-5251):
. Torque screwdriver's bit (+2 mm, l= 75 mm):
Preparation
1. Turn the Power Off
2. Connect the Oscilloscope
CH-1 : TP500/APR-12 board (1.PB.L signal)
Ground at E500
CH-2 : TP600/APR-12 board (2.PB.L signal)
Ground at E600
Oscilloscope setting :
CH-1 : 200 mV/DIV
CH-2 : 200 mV/DIV
TIME : 1 ms/DIV
n
"1.PB.L" signal (TP500) is the playback signal of
the CH-1 of the AT head.
"2.PB.L" signal (TP600) is the playback signal of
the CH-2 of the AT head.
3. Set the Alignment Tape
Set the CR8-1A/PS and put a weight on the
cassette so that it does not rise up.
Weight about 1000 g is suitable.
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
7-1-8. AT Head Head-to-tape Contact Check and Adjustment
8-960-097-45
J-6252-510-A
J-6323-420-A
. Connection of the oscilloscope
CH-1: TP500/APR-12 board (1.PB.L signal)
CH-2: TP600/APR-12 board (2.PB.L signal)
<APR-12 board, side A>
A B C
E500
TP500
Preparation
D E F G
E600
TP600
1
2
3
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