HEATHKIT HM-2102 BULLETIN PDF

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SPST pushbutton power switch breaks down quite often. Check idler wheel height adjustment. Replace idler wheel if it has a "hardened" appearance. Soak the bearing assembly in solvent the assembly at the base of the spindle. Lightly oil this bearing assembly and the cam next to it after cleaning. Check speed with a strobe disk. Clockwise movement of the markers indicates a slightly fast rotation normal.

CCW movement is too slow. Tone-arm behaves normally halfway across LP, then sticks--playing the same groove over and over. Replace entire cartridge, AD Parts for the turntable can also be found in the AD manual. Place the banded end to ground. This is the outer foil and provides shielding to prevent coupling from R66s bias cable to C2. Also, reposition the wires from R34 as far from the slide switch as possible consider using shielded cable.

Normal bias adjustment levels are about Vrms at yellow wires of head. Dropping to about 16 Vrms improves high frequency response but causes distortion. The VU meters are used in record only--not playback. Voltage Measurements I. Also, the clamps holding the phenolic backs can be tightened.

AJD The effect of the SCA filter switch is very obvious: With this switch off, a high-pitched whistle can be heard in the background on stereo programs. The coupling capacitance between any disconnected unshielded input or tape output line to the rest of the wiring harness measures about 30 pF.

Dim stereo lamp: Check for open C AM oscillations: High end too sensitive--back off the RF and antenna trimmers to fix--will stay in specs. AR 1 MHz oscillation at speaker output: Check or for leakage. Or miswired transistor sockets. AM or FM dial cord jams: Try repositioning the respective tuning shaft bracket.

Adjust the output to give an approximate level RF of 0. Use a 10 MHz scope or better and a low-capacitance X10 probe. Same setup as before. In the "A" model, C was changed from 0. This reduces the load on Qs collector and a smaller RF signal 0. A smaller AGC voltage is developed, so that the signal at Q collector is greater about 1.

Thus, for the same level of incoming signal, the S-meter on the ARA may indicate a lower level. CO Cal position shows 2 cycles for a brief period: Normal--can be speeded up somewhat by selecting D with a higher reverse resistance. Non-linear sweep: Check for leaky Q CO Tachometer jitters: This is normal. Intermittent tachometer operation or no operation on motors other than 8 cylinders: Check for spread sockets on pins 1 and 8 of IC If too heavy of wire is used during calibration, the above may occur.

Different balance voltages with modified board--R from 47 ohms to 33 ohms. R from 22 kilohms to 47 kilohms. Be sure the insulation beneath it is installed. Note that the reset button must be set in function 5 prior to counting up a number. GC Improved dynamic range for automatic dimming circuit: Change R8 to 15 kilohms.

Later, he was promoted to Factory Service Supervisor for the computer product line. General Interference may occur when the receiver is installed in the airplane, but not in the shop: This may be due to metal-to-metal contact in the plane push rods, etc.

Jittery Servos: This can be caused by the motor wiring. If degree rotation occurs, try reversing the connections to the motor before replacing. GDA Servos are sluggish or have poor torque: The rack gears may be slightly out of tolerance. Also, observe left-right pairing of rack gears for proper centering.

Sluggish in one direction, will rotate nearly degrees with servo simulator, centering standard causes rotation in one extreme direction: All this is due to a dead monostable multivibrator.

Check that the red wire to C8 is wired to the center tap and not the tap opposite the green wire. GD Marginal operation: Clean the search coil circuit board. Check C6 for leakage. IT "eye" should open in 5 to 10 seconds. Oscillator is temperature sensitive and may not work in extreme cold or heat. GD Intermittent oscillations in transmit: Tighten the hardware to the switching board--the bracket--strap and solder with braided shield if necessary.

Placing a 0. If no replacement search coil available, shunt R with cap in the pF range such as mica 24 pf. Can be either of two types--bases and collectors reversed--see pg 22 of assembly manual. GD Normal Operation: No load draws about 0. One inch of water with an object will draw 0. GD Do not use an isolation transformer--touch switch may not work properly. The drivers should reproduce a waveform as it normally would. If not, several expensive components have been saved from destruction.

Activate the dubbing switch. Previous signal at the output should disappear. Turn the volume to near maximum. Tap the left and right headphone. A faint tap should be heard in the left and right speaker. Plug the headphones into the dubbing output. Feed a signal into a function switch-selected input such as "AM" or "FM". The signal should be faintly heard in the headphones. Reduce the volume setting and return the system to normal. B Change R to ohms. C Change R to ohms.

When aligning the unit, be sure the top cover is in place or the C, D, E, and F bands my break into parasitic oscillation. E-band extremely touchy in alignment of the oscillator--both high and low end: This can be caused by missing jumper wire from SWB, pin 8 to the circuit board solder run L, R, etc.

Align the E and F bands first: If Q does not function properly, it can be replaced without having to re-align the entire unit. Do not attempt alignment without the top cover or the bottom switch-board shield, or without the switch shaft installed.

All of these will affect the local oscillator frequency. E and F bands dead on the low end: This may be due to a low gain-bandwidth product of Q, so that with the lower Q of CLR on E and C, L, R on F when tuned to their respective low ends prevents enough positive feedback to maintain oscillation.

To cure, try removing R and replacing the ohm at R with a ohm resistor. GR TI brand will not always work here. Use Fairchild. High voltage drops with the brightness turned up--similar to low horizontal drive: Check for open L AFC erratic; picture loses sync, picture polarity reverses: Problem occurs when changing channels.

Corrects itself when turning the TV off or on: Check Lshould be to tuned to 2nd peak from the top. GR Luminance board same as except for Q in the dot generator and can be interchanged for most purposes. Check for open L Boards check okay for any kind of problem, wiring appears correct: Check the wiring harness at the breakouts.

Now and then, two or more wires will pinch together possibly at time of harness construction. No dots: Check for leaky C Intermittent horizontal jitter: Check C No AFT--adjusts okay: Check for reversed black and red wires on red chassis plug.

Only one should be high. If not, the cathode voltages of D through D cannot be properly controlled by any single tuning potentiometer. GR Clock oscillation: 1 Put ferrite bead on Q53 collector. H-Series Computers Check for shorts between runs on the mother board. Most common problem.

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