Hello all I purchased a non working Tag Team and Resoledred the ROM chip to a remote location off the Main CPR due to cracks in the solder. The game worked for about a month with no problems and the last week it stopped booting up. I am new to this hobby and I need some help. This is what I have come up with while th eboare is on the bench with 5.10vdc applied and it is pulling approximatly 1.11Amps.
U1 Pin 40 (RES) Low going high on power on. Remains high.
U4, U5, U6 pin 34 (RES) same as for U1.
Clock circuit
U1 Pin 37 (phase 1 in) ~ 833 Khz.
U1 Pin 38 5vdc?
Z3 Pin 11 Same as Pin 37 clock pulse
Z3 pin 10 Same
Z3 pin 13 same.
Z3 pin 12 same.
U4 pin 39 same.
U1 Pin 2 (RDY) +4.95 Vdc.
U1 Pin 4 (IRQ not) High signal not pulsing.
U1 address lines:
Pin 9 (AB0) no activity.
Pin 10 (AB1) no activity.
Pin 11 (AB2) ditto.
Pin 12 (AB3) ditto.
Pin 13 (AB4) ditto.
Pin 14 (AB5) ditto
Pin 15 (AB6) DC voltage with small square wave superimposed, same as pin 40 on U4, U5, U6 (which is A6 on those chips).
Pin 16 (AB7) similar to pin 9 - 14. 5 vdc
Pin 17 (AB8) CRO 5 vdc
Pin 18 (AB9) 5 vdc
Pin 19 (AB10) 5vdc
Pin 20 (AB11) 5 vdc
Pin 22 (AB12) 5vdc
Pin 23 (AB13) 5vdc
U1 Data bus lines:
Pin 33 (DB0) 5vdc
Pin 32- 26 (DB1-7) 5vdc
Switch matrix chips
Z13
Pin 1,2,4,5,9,10,12,13 +5v DC
Pin 3,6,8,11 Low
Z14
Pin 1,2,4,5,9,10,12,13 +5v DC
Pin 3,6,8,11 Low
Switch Matrix Strobes/Rows:
Z11
Pin 2,4,6,8,10,12 all low
Pin 1,3,5,9,11,13 all high
Z12
Pin 2,4 low
Pin 1,3 high
RIOT Chips Chip select:
U4
Pin 37 (CS2 not) Square wave approximately 5vdc
Pin 38 (CS1) low
U5
Pin 37 (CS2 not) 5vdc
Pin 38 (CS1) 0
U6
Pin 37 (CS2 not) 5vdc
Pin 38 (CS1) Low .
U4 Switch Matrix Strobes
Pin 24 -21, 19 - 17 (PB0 - PB6) All high
pin 20 (VCC) +5v DC.
pin 39 (phase 2 clock) ~833 Khz.
pin 25 (IRQ not) High no pulsing
pin 38 (CS1) nothing
pin 37 (CS2 not) high
pin 36 (RS not) high
pin 35 (R/Wnot) high
pin 34 (RES not) high.
pin 1 (VSS) gnd.
A0 - A6 (pins 7-2 and 40)
As per U1 no activity
D0 - D7 (pins 33 - 26)
As per U1 no activity
PA0 - PA7 (pins 8 - 15) all low.
PB0 - PB7 (pins 24-21, 19-16) all high.
Any ideals of what to check next. I am leaning to replacing the u4 riot chip but I am not sure. Any help Thank you
Jim
U1 Pin 40 (RES) Low going high on power on. Remains high.
U4, U5, U6 pin 34 (RES) same as for U1.
Clock circuit
U1 Pin 37 (phase 1 in) ~ 833 Khz.
U1 Pin 38 5vdc?
Z3 Pin 11 Same as Pin 37 clock pulse
Z3 pin 10 Same
Z3 pin 13 same.
Z3 pin 12 same.
U4 pin 39 same.
U1 Pin 2 (RDY) +4.95 Vdc.
U1 Pin 4 (IRQ not) High signal not pulsing.
U1 address lines:
Pin 9 (AB0) no activity.
Pin 10 (AB1) no activity.
Pin 11 (AB2) ditto.
Pin 12 (AB3) ditto.
Pin 13 (AB4) ditto.
Pin 14 (AB5) ditto
Pin 15 (AB6) DC voltage with small square wave superimposed, same as pin 40 on U4, U5, U6 (which is A6 on those chips).
Pin 16 (AB7) similar to pin 9 - 14. 5 vdc
Pin 17 (AB8) CRO 5 vdc
Pin 18 (AB9) 5 vdc
Pin 19 (AB10) 5vdc
Pin 20 (AB11) 5 vdc
Pin 22 (AB12) 5vdc
Pin 23 (AB13) 5vdc
U1 Data bus lines:
Pin 33 (DB0) 5vdc
Pin 32- 26 (DB1-7) 5vdc
Switch matrix chips
Z13
Pin 1,2,4,5,9,10,12,13 +5v DC
Pin 3,6,8,11 Low
Z14
Pin 1,2,4,5,9,10,12,13 +5v DC
Pin 3,6,8,11 Low
Switch Matrix Strobes/Rows:
Z11
Pin 2,4,6,8,10,12 all low
Pin 1,3,5,9,11,13 all high
Z12
Pin 2,4 low
Pin 1,3 high
RIOT Chips Chip select:
U4
Pin 37 (CS2 not) Square wave approximately 5vdc
Pin 38 (CS1) low
U5
Pin 37 (CS2 not) 5vdc
Pin 38 (CS1) 0
U6
Pin 37 (CS2 not) 5vdc
Pin 38 (CS1) Low .
U4 Switch Matrix Strobes
Pin 24 -21, 19 - 17 (PB0 - PB6) All high
pin 20 (VCC) +5v DC.
pin 39 (phase 2 clock) ~833 Khz.
pin 25 (IRQ not) High no pulsing
pin 38 (CS1) nothing
pin 37 (CS2 not) high
pin 36 (RS not) high
pin 35 (R/Wnot) high
pin 34 (RES not) high.
pin 1 (VSS) gnd.
A0 - A6 (pins 7-2 and 40)
As per U1 no activity
D0 - D7 (pins 33 - 26)
As per U1 no activity
PA0 - PA7 (pins 8 - 15) all low.
PB0 - PB7 (pins 24-21, 19-16) all high.
Any ideals of what to check next. I am leaning to replacing the u4 riot chip but I am not sure. Any help Thank you
Jim
