Marantz 5010 - 4.2 Electrical Adjustments and Measurements

4.2 ELECTRICAL ADJUSTMENTS AND
MEASUREMENTS
Precautions Before Adjustment and Measurement
1. Before playing the test tape back,
thoroughly demagnetize the heads, capstan
and similar metal parts using an eraser as the
test tape-recorded tone is easily erased.
2. Do not place the test tape on any measuring
instrument.
3. Do not put the test tape near a place where
the eraser is used.
4. Method of Demagnetization:—Turn the eras-
er power switch on at a remote position far
away from the heads. Bring the eraser close
to the heads, capstan and other parts to be
demagnetized, and move it up and down
four or five times to demagnetize. Slowly
separate the eraser far away from the parts,
and turn the power switch off.
5. Do not use any magnetized adjusting tool.
When using it, demagnetize it from time to
time in the course of each adjustment..
6. Do not turn semi-fixed resistor, capacitor,
and inductor adjusting screws more than
needed.
7. If measuring the tape speed wow and flutter,
operate the tape deck in the normal opera-
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- METER
ting condition. :
Do not apply locking bond excessively.
The ‘‘norma! playback state’’ is an operating
state of the tape deck which plays back the
MTT-150 test tape and is adjusted so as to
produce a 775mV output at the MAIN P.W.
Board (P100) J120, J220 with the load
assuming the measuring instrument input
impedance of greater than 100kQ2 and with
the TAPE selector switch set at the
NORMAL position.
The “‘normal recording state’’ is an operating
state of the tape deck which records a 1kHz
signal to a specified recording level for which
the recording level control is adjusted with
the 1kHz signal applied at a specified input
level to the MIC input terminal.
In the normal recording state, therefore, this
tape deck is set up with the level control to
the state that the level meter pointer may
deflect to the 100% mark as OVU with a
1kHz, 1mV input signal applied.