Hitachi D-E99 Service Manual page 4

ADJUSTMENT
Perform the following adjustments in the sequence stated after cleaning the heads, pressure rollers, and capstans with a head
cleaning stick moisted in alcohol. Also, unless otherwise specified, set the switches and controls to the positions indicated
in the table. (:''
Symbol No. Switches and Controls
Position Symbol No.
Switches and Controls
Position
S1 Input select switch LINE
S2 Tape select switch NOR-I
S3 Auto/memory REW switch
OFF
S4 Timer switch OFF
S5 Dolby NR switch OFF
S6
Dolby NR B/C switch B
Measuring Instrument
and Connection
Check
Item Adjustments
Measuring Input Output
Tape
Instrument Terminal
Terminal
MTT-111,
1
Tape
· Frequency
- -
LINE
3000 Hz
speed counter OUT
(3150 Hz*)
Tilt and
·Head
(1) height of
adjusting
- -
- - - -
the head
jig
2
(2)
Head
· VTVM
--
LINE MTT-114
azimuth
~:~TRI (10kHz)
·Audio
Digital oscillator
3 peak
(400 Hz)
LINE - -
meter
· Attenuator
IN
· VTVM
MTT-150,
4
Playback
· VTVM
TP2L, R
400 Hz,
gain
- -
20m Max-
well
Note:
1. Adjust within 30 sec. after heat-running for more than
20 minutes.
2. Use the Hitachi head adjusting jig and instructions
(consult nearest Hitachi office) to obtain the correct
head height, tilt and azimuth. This adjustment has to be
done alternately.
c
B
A
Fig. 1
- 4 -
S7 MPX switch
OFF
SB Monitor switch
TAPE
S109
ATRS switch
OFF
S111 Fixed switch
ON
RV1L, R Record level controls
MAX.
RV2L, R Output level control
MAX.
* According to DIN 45 500
Adjusted
Adjusted
Mode
Remarks
Position
Value
Semi-
3000 Hz
Playback
variable
resistor in
+20H
- 5 z
See Note 1
the motor
(3150 Hz*)
Screw@,
Playback
- -
See Note 2
@.©
Playback
Screw©
Output
See Note 3
Max.
O dB
- -
RT303L, R
indicators
See Note4
flash
- -
Playback
RT301L, R 580mV
See Notes
3. When the maximum values of both channels are dif-
ferent, adjust to the maximum value of the L channel. In
this case, the difference between the maximum values of
both channels should be within 2 dB.
4. 1) Set the monitor switch to the SOURCE position.
2) Feed a 400 Hz signal to the LINE IN jacks and adjust
the audio oscillator output so that the level of TP1L, R
becomes 580mV.
3) Then, adjust the attenuator to lower the output level
by 0.5 dB and adjust RT303L, R so that 0 dB indicators
of the digital peak meter flash.
4) Adjust the attenuator to increase the output level by
0.5 dB and confirm O dB indicatms of the digital peak
meter light up.
5. Playback a test tape (MTT -150, 400 Hz 20m Maxwel
I)
and
adjust RT301 L, R so that the level of TP2L, R bec.omes
580mV.
I
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