Shopping cart is empty
English Polski Spanish 
Search For a Manual

(e.g. AA-V20EG JVC, ZX-7 Sony )
PayPal 1000+ rating Secure, Encrypted Checkout.
Who's Online
There currently are 479 guests online.
Featured Product
Home >> HITACHI >> CM621FET Service Manual
 0 item(s) in your cart 

Service Manual

Tweet about this product and get $1.00 of store credit for instant use!
  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of HITACHI CM621FET Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

Not yet ready
You must purchase it first

Customer Reviews
There are currently no product reviews.
Other Reviews
 1604-VLZ PRO MACKIE Service Manual by Douglas Cramer;
I was having a hard time finding the problem with this Mackie 1604 unit. I didn't have a schematic. Went looking on the web and found your site and the price was more then reasonable. Ordered it and within the hour had the manual and within 15 minutes had the unit fixed. Best $4.99 I ever spent. Thank you. Doug
This is a service manual in every sense of the word ( French and German versions of the text are included, as well as English..) There are explanations of the mechanical and electrical functions, plenty of mechanical drawings, and the needed schematics. The quality of the scanning is excellent - all the component values are clearly legible - and very usefully there are pcb component layouts, so you can find a component on the schematic, and then very quicky pinpoint its physical location on the relevant pcb. I cannot see how I can give this manual any less than the maximum 5 stars! Great value for money, which will pay for itself immediately. Excellent all round!
 SR7000G MARANTZ Service Manual by charles w leebens;
the manual is great and especially hard to find... thanks for the great service and having a hard to find manuel_
 1310R ALPINE Service Manual by Maciej Klepaczewski;
Please tell us what you think and share your opinions with others. Be sure to focus your comments on the product. You will receive $2.50 of store credit for Your review.
 HA6800 HITACHI Service Manual by Stephan Lellmann;
hat alles sehr gut geklappt. Das Servicemaual ist gut zu verwenden. Die Pläne und Schrift ist klar und leserlich. Außerdem preiswert. Grüße an alle Hifi-Bastler

Text excerpt from page 15 (click to view)
The 90Vac-265Vac input line voltage is rectified by D901- D904, and smoothed by C906 to provide DC operating voltage for the circuit.

When power is initially applied to the circuit, C909 charges through R903, Q902.When the voltage across C909 reaches a level of 16V, U901 is enabled, turning on Q903 and turning off Q902 to complete start-up action. During the On-time of Q901, energy is stored in T901. At this time the polarity of the output windings is such that all output rectifiers are reverse biased and no energy is transferred. Primary current is sensed by R907 and compared to a DC level that is determined by voltage feedback. When this level is reached, Q901 is turned off and the polarity of all T901 windings reverses , forward biasing the output rectifiers. All the energy stored is now transferred to the output capacitors. Many cycles of this store/release action are needed to charge the outputs to their respective voltages. The voltage across C946 is fed through a voltage divider R970, R971, R972, R975 and VR901 to the error amplifier U904 and compared to an internal 2.5V reference ,then determine the feed back level of U901 pin 1.

Energy stored in the leakage inductance of T901 cause a voltage spike which be added to the normal reset voltage across T901 when Q901 turn off. The clamp consisting of D905, R904 and C907 limits this voltage excursion from exceeding the Vds rating of Q901. In addition, a turn off snubber made up of D906, R905 and C908 keeps power dissipation in Q901 low by delaying the voltage rise until drain current has decreased from its peak value. This snubber also damps out any ringing which may occur due to parasitic.

The oscillator frequency is defined by R912, C912. The equation is approximately : Fosc=1.8/ (R912*C912). The external signal âSYN+ & SYNââ that comes from horizontal circuit FBT can synchronise the working frequency of power circuit Via R919, C916 and R918.

The monitor has ON, Suspend/Standby and OFF states. The monitor enters Suspend/Standby mode if either V-sync or H-sync signals are removed. When the machine in the Suspend/ Standby State, PS1 should be low to turn off +13.5Vs. In this state, input power should be less than 15W and LED-1 LED illuminate yellow. The monitor enters OFF mode if both H-sync and V-sync are removed. When in the OFF State, PS1 and PS2 should below simultaneously to turn off +13.5Vs and +7.1Vs outputs. In this state, input power should be less than 5W and LED-1 LED illuminate amber.


You might also want to buy


Owner's Manual

Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
Parse Time: 0.192 - Number of Queries: 118 - Query Time: 0.026