|
|
|
Who's Online
There currently are 6043 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
;
Quality scan of the original. All the detail necessary to troubleshoot, repair and adjust the unit. I'm sure I will be downloading more manuals in the future as the need arises.
;
Exactly as described, a Service Manual complete with the schematics and PCB layout delivered in a timely manner. Many thanks for the great service.
 ;
some of the writing is a bit blur but the part in the schmatic was great and i have fixed the machine thanks
;
Well.. I'd searched for this manual and although I found many copies online I was pleased to find your website with a well balanced pricing system and easy to search and follow links. That together with the very quick response time was just what I was looking for.. being a very impatient tech.. ;-) I had the service manual in front of me within a short time.
Bookmarked.. and you can bet I will always come here first for my service & user manuals..
best regards
Ed(Tony) Foley
G7WHK
2-4. Charging Circuit
Figure 2-7 shows the charging circuit block diagram. (1) Operation of the system controller IC801 during charging When the DC plug is connected to the DC jack, the supplied voltage is supplied to the system controller pin%¶ [DCINMNT] of IC801 and PIN#¢ [DCIN] of POWER CONTROL IC401 via D415. Each IC detects that AC adapter is connected. After the system controller IC801 starts up and recognizes that AC adapter is connected, the system controller IC801 detects the rechargeable battery by the input terminal of pin^¡ [CHGMHT2] as described below. When the system controller IC801 recognizes that a voltage is input to pin^¡ [CHGMNT2], an "H" signal is output from pin!¡ [CHGON]. POWER CONTROL IC401 starts the charging operation by this "H" signal. = Rechargeable Battery Detection = The system controller IC801 performs the battery detection by pin^¡ [CHGMNT2]. When the rechargeable battery is inserted (see Fig. 2-8(a)), a voltage is input to pin^¡ [CHGMNT2] because cathode of the supplied rechargeable battery is exposed. When an alkaline dry cell battery (size AA) is inserted (see Fig.2-8(b)), voltage is not input to pin^¡ [CHGMNT2] because cathode of the battery is molded. In the system controller IC801, if no voltage is input to pin^¡ [CHGMNT2] , an "L" signal is output from pin!¡ [CHGON] and the charging operation stops. When batteries are inserted as shown in Fig. 2-8(c), voltage is input to pin^¡ [CHGMNT2] of the system controller IC801. An "L" signal is output from pin!¡ [CHGON] because the system controller IC801 detects that the voltage rise time is fast (Generally, primary cell has a characteristic that the voltage rise time is faster than secondary cell.) and identifies that the inserted battery is not a rechargeable battery, and an "L" signal is output from pin!¡ [CHGON]. Hence, the charging operation stops.
Rechargeable battery detection terminal
Rechargeable battery detection terminal
Rechargeable battery detection terminal
(Voltage is output because the minus side of the rechargeable battery is not molded.)
(Voltage is not output because the minus side of the battery is molded.)
( Voltage is output because the minus side of the rechargeable battery is not molded.)
TO IC801 61pin CHGMNT2
TO IC801 61pin CHGMNT2
TO IC801 61pin CHGMNT2 (Detects that the inserted battery is not rechargeable battery because the voltage rise time is fast.)
(a)When rechargeable battery is inserted
(b)When alkaline battery is inserted
(c)Example of inserting rechargeable battery and alkaline battery
Fig. 2-8 How to detect the rechargeable battery
� 15 �
|
|
|
> |
|
