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1.
IR Adjustment (AU-135 board)
Alignment tape:
AFM stereo
For checking operations
(WRS-9NS)
Digial volte
Aipstmen Page
[Dd
Adjustment Address
| 7A (1.5 IR), 7C (1.7 IR)
Specified Value
The DC voltage difference between
P
pins @ and © is 0 + 10 mVde
Adjusting method:
1)
Release the protect.
Page: 1, address: 00, data: 01
e LCHIR adjustment
2)
Connect the digital voltmeter to pin @ of IC601, and read
the voltage. (Approximately 2100 mVdc)
3)
Connect the digital voltmeter to pin © of IC601.
4)
Change the data of page: D, address: 7A, and adjust so that
the voltage of pin © of IC601 becomes equal to the voltage
of pin @. (Voltage difference below 10 mVdc)
5)
Press the PAUSE button of the adjusting remote control
unit.
e RCH IR adjustment
6)
Connect the digital voltmeter to pin @ of 1C602, and read
the voltage. (Approximately 2100 mVdc)
7)
Connect the digital voltmeter to pin © of 1C602.
8)
Change the data of page: D, address: 7C, and adjust so that
the voltage of pin © of IC602 becomes equal to the voltage
of pin @. (Voltage difference below 10 mVdc)
9)
Press the PAUSE button of the adjusting remote control
unit.
2.
1.5 MHz Carrier Frequency Check (AU-135 board)
Note: Use a high impedance (above 1 MQ ) and low capacity
(below 20 pF) probe.
Checking method:
1)
Check that the 1.5 MHz carrier frequency satisfies the
specified value.
:
Pins @ and © of IC601 (LCH IR)
;
Pins @ and © of 1C602 (RCH IR)
a
[Sign
Nosigmai
Checking method:
1)
Check that the 1.7 MHz
carrier frequency satisfies the
specified value.
4.
1.5 MHz Record Level Check (AU-135 board)
Signal
Noid
Note: Do not insert the plug into the audio input terminal
(right).
Checking method:
1) Check that the 1.5 MHz carrier level satisfies the specified
value.
(Read the center of the luminance line width and note down
the level read.)
7
A
fists
~
L- 0.667 psec
Fig. 9-26.
— 258 —
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