Harman kardon hk 400 xm service manual

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The Harman Kardon
Model hk 400xm

Stereo Cassette Deck

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harman/kardon

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PRECAUTIONS

1.

Always disconnect the chassis from power line when soldering. Turning the power switch OFF is not enough. Power line
leakage passing through the heating element may destroy the transistors.

Never attempt to do any work on the transistor amplifiers without first disconnecting the AC line cord and waiting until the
power supply filter capacitors have discharged.

Replacement for output and driver transistors, if necessary, must be made from the same beta group as the original type.

If one output transistor burns out (open or short) always remove all the output transistors in that channel and check the bias
adjustment, the control and other parts in the network with an ohmmeter before inserting a new transistor. All transistors
in one channel will be destroyed if the base biasing circuit is open on the emitter end.

When mounting a replacement power transistor, be sure that the bottom of the flange, the mica insulators and the surface of
the heat sink are free of foreign matter, for they may cause transistor failure.

Silicon grease must be applied between the transistor and the mica insulator, and between the mica insulator and the heat
sink for better heat conduction.

Fuses must be replaced with size and type indicated. Use of other types can expose components to destructive current levels.

ALIGNMENT PROCEDURES

MECHANICAL ADJUSTMENTS
RECORD/PLAVBACK HEAD ADJUSTMENT

1.
2.

3.

Set the head gauge (M-300) to the cassette compartment.

Depress playback button and, adjusting the hexagon screws (A) and (B) to the same direction and turns, set the head so as
the adjustment chip attached to the gauge not to touch the tape guide of the head as shown in Fig. 1.

Set the unit at auto search position and adjust the head base bracket so as the top end of the adjustment chip (MAZ-0181(B))
comes to between 0 and MAX on the head gauge as shown in Fig. 2 by loosening and refastening the screws (C) and (D).

Depress playback button and adjust the head by shifting the shaded part of head slider to the directions as shown in Fig. 3,

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3.

so as the top end of the attached adjustment chip comes to between MINI and 0 on the head gauge as shown in Fig. 2.
Follow the head azimuth adjustment.

ERASE HEAD ADJUSTMENT

l.
2.

3.

Set the head gauge to the cassette compartment.

Depress playback button and adjust the head hight with special washer under the head so as the adjustment chip attached to
the head gauge not to touch the tape guide as shown in Fig. 1.

Depress playback button and set the head to the position where the attached adjustment chip comes to between MIN and 0
on the head gauge as shown in Fig. 2 by adjusting with screws (E) and (F).

PINCH ROLLER TENSION ADJUSTMENT

'l.

2.

Make sure that the clearance between the pinch roller and the lever is 0.3mm when unit is in the play mode. If not, bend
the lever adjustment point (A) in the arrow direction as shown in Fig. 4 to adjust the clearance.

Bend the lever adjustment point (B) in the arrow directions as shown in Fig. 4 so that the tension by pinch roller may be
3109:409 when keeping apart pinch roller from capstan (about 0.2mm) and returning it to rotate.

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