MSX2+ (XDJ) slow to boot

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Par Arkhan

Champion (259)

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03-11-2009, 22:28

Are there any known reasons why an MSX2+ Sony HB-F1XDJ would take about 30 seconds after power on to display the MSX boot screen?

It doesnt do it at first, but if I put a cartridge in and power on, it does this. Removing the cart and booting without it makes it keep happening.

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Par sd_snatcher

Prophet (3019)

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04-11-2009, 00:35

AFAIK, the Sonys HB-F1XDJ and HB-F1XD have a very slow diskrom. I certainly would replace it if I had one.

Par Arkhan

Champion (259)

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04-11-2009, 01:10

the diskrom has nothing to do with it. it hangs at a black screen and doesnt show the blue MSX boot logo screen for 10-45 seconds.

I suspect capacitors. It boots up perfect after it sits for 3+ hours

Par Ikeda

Supporter (14)

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04-11-2009, 02:22

I am useing SONY HB-F1XDJ(MSX2+). I need not wait 30 scounds. You must remove DRY BATTERY in SONY HB-F1XDJ(MSX2+). Enjoy MSXing!

Ikeda from Osaka, Japan

Par Arkhan

Champion (259)

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04-11-2009, 02:47

It had no batteries in it.

I replaced with fresh ones on a whim earlier today, it did not change anything.

Par Leo

Paragon (1236)

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04-11-2009, 07:40

my xdj is also slow , and i have a problem with disk i think,
its been months i have turn it on but i remember if i put a disk into
the drive it faster or reverse : i ave not to put a disk dont remember ...
but that makes a difference

Par Arkhan

Champion (259)

Portrait de Arkhan

12-11-2009, 00:47

its probably something on the power circuit, but i cant say for sure. I dont think any other hardware would be causing it to lag for 30 seconds before displaying the MSX bootscreen

Par flyguille

Prophet (3029)

Portrait de flyguille

12-11-2009, 01:21

just opens it, and remove some roms, start testing having only BIOS plus sub-bios if it starts ok.... can be two reasons, some extra rom failing or because you lowered the load to the power supply.

But, I thinks, it is a problem of the clock circut failing, like the clock out pin of VDP delivering a pulse with lower voltage.

Par flyguille

Prophet (3029)

Portrait de flyguille

12-11-2009, 01:23

if were the power supply, it will do garbage screens, and hung / freeze 99% of the boots, else that the +12v line is poor, so that will affects to the disk drive, and the diskrom waiting an eternity looking for the TRACK ZERO signal.....!!!! that inspection does in the first stage before the stage of loading the boot sector, but that stage is after the boot-logo sequence.

Par Arkhan

Champion (259)

Portrait de Arkhan

12-11-2009, 02:10

it hangs before displaying anything.

the power LED comes on and the screen remains black for about 30 seconds, and then the blue MSX boot logo screen appears.

Par flyguille

Prophet (3029)

Portrait de flyguille

12-11-2009, 02:29

that is not a hung, that is a slows, a hung is when the z80 makes an interpretation error because has low power feed, in this case (5v) it will never to boot....

now , when the problem is 12v, it is another thing, can fail the FDD controller or the drive, but if that is the case (I not knows the circuit) maybe it will impact in video output (like poor signal, distortion etc)... if that is not the case

so only left the clock circuit, and since that the z80 is just working slow.

ohhh also can be the PULL- UP of the /RESET z80 pin!

on power on it has 0v, in just half second or less it reachs the 5v..., it consists in two resistences and a capacitor, maybe the resistence conected to 5v increase its value (that is when the legs has oxid internaly doing fake contact), if that is the case just a warn with ironsolder and then turn on the msx, it will boots normal.

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