MITSUBISHI HSS5600E
Service Manual

MITSUBISHI HS-S5600E
Mechanical Adjustments Cont�d
assemble the loading gear arm to the shaft so that the pin of the loading gear arm enters the groove of the main cam 2. Secure the loading gear arm with two grip rings. E.Install the ribbed belt.(Refer to Fig. 2-5.) F. Install the tension unit to the main plate with the screw (b) and the nut (c). G.Fasten the capstan brake spring to the tension unit and the capstan brake unit. H.Install the holder belt unit to the main plat with the screw(a). I. Install the cassette housing as in Para. 2-1-2. 3-1 Adjustment of Back Tension and Tension Pole Position (Refer to Fig. 3-1.) Run a blank tape for several minutes to break in the reel disks and the transport before beginning the adjustment. A. Set the back tension measuring jig and set the VCR to the playback mode. B. When the running of the tape becomes steady, make certain that the tension arm check hole is within the M/P hole of the main plate (0 ± 0.5mm) or the interval between the center of tension pole and the center of Supply guide pole is 2 ± 0.5mm. C. If neither the center of Tension pole nor the tension arm check hole is in position, loosen the T band holder fastening screw lightly and move the T band holder so that the condition specified by the para.B is satisfied. D. On completion of adjustment, tighten the T band fastening screw. E. Make certain that the reading of the back tension measuring jig is 50 ± 6g-cm. F. When the running of the tape is steady, check visually to make certain that the deflection of the Tension pole is 1 mm or less. Note: Slight fluctuation of back tension may be tolerated, however if fluctuation exceeds 5g-cm, the reel disk etc. may be defective. Examine and correct the defect. 3-2 Check and Adjustment of Roller Unit Position (Refer to Fig. 3-2.) Fig. 2-17-2 A.Supply D.C.12V to the connector CP of the Roller Unit, as shown in Fig.3-2 B.Confirm that the lever of the roller unit is within the limits of the notch. C.Confirm that the roller turns with the drum. D.Open the connector CP. E.Confirm that the gap between the drum and the roller is over 1.5mm, and confirm the roller does not touch the shield cap of head amp PCB. F. If the results above item (A to E) are below standards, loosen two screws (a) and (b) as shown in Fig. 3-2, and turn the roller unit around the screw (b) in the directior of the arrows. And adjust again. G.After the adjustment fasten two screws (a) and (b). 3-3-1 Guide Roller Adjustment (Refer to Fig. 3-3-1.)

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3-3 Check and Adjustment of FM Envelope A.Set the VCR to the playback mode. B.Preset tracking. C.Check if the FM waveform is flat like A shown in Fig. 3-3-1. D.Adjust the height of the supply guide roller as in 3-3-2 if the leading portion (the entry side of the drum) of the FM waveform is not flat like B or C. Adjust the height of the takeup guide roller as in 3-3-3 if the trailing portion (the exit side of the drum) is not flat like D or E. 3-3-2 Adjustment of Supply Guide Roller Height (Refer to Fig. 3-3-1, 3-3-2.) A.Loosen the set screw to such a degree as the supply guide roller turns ightly.(Refer to Fig. 3-3-2.) B.The supply guide roller is low if the leading portion (the entry side of the drum) of the FM waveform is like B, and high if like C. Adjust the height of the roller by turning the adjusting screw at the top of the roller so that the FM waveform shall be flat like A. � Turn the adjusting screw counterclockwise if the roller is low. � Turn the adjusting screw clockwise if the roller is high. C.Carry Out the coarse adjustment of phase as in 3-3-4. 3-3-3 Adjustment of Takeup Guide Roller Height (Refer to Fig. 3-3-1, 3-3-2.) A. Loosen the set screw to such a degree as the takeup guide roller turns lightly. (Refer to Fig. 3-3-2.) B.The takeup guide roller is low if the trailing portion (the exit side of the drum) of the FM waveform is like D, and high if like E. Adjust the height of the roller by turning the adjusting screw at the top of the roller so that the FM waveform shall be flat like A. Turn the adjusting screw counterclockwise if the roller is low. Turn the adjusting screw clockwise if the roller is high. C.On completion of height adjustment, adjust the azimuth and height of the A/C head as in 3-4-2. D.Coarsely adjust the phase as in 3-3-4. Fig. 3-3-2 3-3-4 Coarse Phase Adjustment (Refer to Fig. 3-3-3, 3-3-4.) A.Set the VCR to the playback mode. B.Preset tracking. C.Check the FM waveform after checking and adjusting the guide rollers. D.If the amplitude of the FM waveform is narrow like F because of out of phase, adjust the phase adjusting nut so that the amplitude of the FM waveform is maximum. Fig. 3-3-5 3-3-6 Check 1:Tape Running Condition on Guide Rollers (Refer to Fig. 3-3-6.) A.Set the VCR to the playback mode. B.Visually check if there is a space between the tape and the lower flange of the supply and the take up guide roller. C.If not, replace the tape guide as in 3-3-7. Note: In this case the tape guide should be replaced with the tape guide which has a larger inclination. D.If the supply tape guide is replaced, check the guide roller as in 3-3-1. If the take up tape guide is replaced, check the guide roller as in 3-3-3, and the waveform flatness as in 3-3-5 E.Load and unload the tape several times to make certain that the flatness of the FM waveform does not change. F. If changes occur, check the A/C arm shaft for looseness. If not free, replace the A/C arm and adjust the audio/control head as in 3-4. 3-3-7 Replacement of Tape Guides Fig. 3-3-3 A.Identify the Item Number of the tape guide to be replaced. This is done by observing the marking present on the die-cast portion of the tape guide base, and comparing that marking to Fig. 3-3-7. B.If the Item Number of the tape guide presently installed is a �2�, replace the guide with an Item Number �1� guide.(Part No. 6358C59010) C.If the Item Number of the present tape guide is a �1�, replace the guide with an Item Number �3� guide. D.If the Item Number of the present tape guide is a �3�, replace the guide with other Item Number �3� guide. E.Once the tape guide is replaced, resume alignment starting with 3-3-1. Fig. 3-3-4 3-3-5 Check of FM Waveform Flatness (Refer to Fig. 3-3-5.) 3-3-8 Check 2: Tape Running Condition on Guide Rollers A.Set the VCR to the playback mode. B.Press the head of the supply guide roller and the take up guide roller lightly, and release the roller. Check if the FM waveform is quickly restored to the previous level. C. If the FM waveform is not restored quickly, replace the tape guide as in 3-3-7. D.If the supply tape guide is replaced, check the guide roller as in 3-3-1. If the takeup tape guide is replaced, check the guide roller as in 3-3-1, and check the FM waveform as flatness as in 3-3-5 E.If satisfactory, tighten the set screw of the guide roller on the supply side and the take up side. Fig. 3-3-7 3-4 Adjustment of Audio/Control Head 3-4-1 Adjustment of A/C Head Slant (Refer to Fig. 3-4-1.) A.Play back a blank tape. B.Turn the screw C slowly clockwise to crease the bottom edge of the tape slightly by the lower flange of the takeup guide pole. C.Turn the screw C slowly counterclockwise to eliminate the crease of the bottom edge of the tape. D.Turn the screw C slowly clockwise again and stop turning just before the tape is creased. 3-4-2 Adjustment of A/C Head Azimuth and Height (Refer to Fig. 3-4-1~3-4-3.) A.Using stair step signal of alignment tape, connect an oscilloscope to the audio output terminal and set the VCR to the playback mode. B.Turn the nut A (height adjusting) and the screw B (azimuth adjusting) so that the audio output level shall be maximum. C.Turn the A/C head counterclockwise and release it to make certain that the audio output level does not change. D. lf the level changes, check if the A/C arm shaft is loose. If not free, replace the A/C arm and adjust the slant of the A/C head as in 3-41 and the azimuth and height of the A/C head from beginning. E. Appy a force lightly to the A/C head shaft in the direction of A and A� of the arrow shown in Fig. 3-4-3 to make certain that the audio output level remains at maximum level and does not change. F. If the level changes, turn the nut A (height adjusting) so that the audio output level is maximum. Apply a force lightly to the A/C head shaft in the direction of B and B of the arrow shown in Fig. 3-4-3 and adjust so that the sound output level is maximum. G.Check the sound output level in the playback mode to make sure that the fluctuation of the level is less than 2dBp-p. H.If the fluctuation exceeds 2dBp-p, adjust the slant of the A/C head and the azimuth and height of the head. I. lf this is still not satisfactory, replace the takeup tape guide as outlined in 3-4-3. Note: In this case the tape guide should be replaced with a guide which has less inclination. certain that the amplitudes around the points �a� and �c� satisfy the requirements given in Fig. 3-3-5. E.If there is deviation from the requirements, conduct the check and adjustment of the FM envelope as in 3-3 from beginning.

Fig. 3-3-6

Fig. 2-17-3

Fig. 2-17-4 3.Interchangeability Adjustment of Mechanism Fig. 3-1 Note 1:Tracking may need to be preset in the inter-changeability adjustment of the mechanism. Digital tracking should be preset. To preset, Set Normal tracking control (VR702) to center click stop position. Note 2: The adjustment is conducted in the playback mode, using the stair step signal of the alignment tape, connect an oscilloscope to TP2A and external Trig, to TP2H, unless otherwise specified. Fig. 3-2 Fig. 3-3-1

A. Set the VCR to the playback mode. B. Set the tracking switch to the manual mode. Vary tracking and check if the amplitude changes while the waveform remains flat. C.Adjust tracking in the manual mode so that the amplitude is maximum, and adjust the oscilloscope so that the amplitude is �5�units on the scale of the oscilloscope. D.Adjust tracking so that the amplitude at the middle (around the point �b�) of the FM wave form is about 80% (�4�units on the scale of the scope) of the maximum amplitude. Make