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needle swing far.
6—2.
Input Level Adjustment
case, the following steps should be taken for adjustment.
The AUX IN jack input can be adjusted in the same manner.
6—3. Recording Bias Current Adjustment
The recording bias current is adjusted properly, and therefore, no adjustment is required normally.
If the
head or other parts are replaced, adjustment should be made in the following manner.
1. Checking the bias current
Place this unit in the recording position, and measure
the AC voltage by V.T.V.M
across each head
without applying recording input through the microphone or others.
If the voltage measured is roughly
as specified below, the bias current is considered to be normal.
Erase head
........
27V
For this test, be sure to use a vacuum tube voltmeter which is superior in high frequency characteristics.
2. Adjusting the bias current
Magnetic head
Note:
Bias current
is properly measured
as follows:
V.T.V.M
Bias current
Normal
: 490uA
Chrome
: 660uA
Fig. 13
—7-
CD-1667, 1667U
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