Ericsson T28S Troubleshooting Manual page 3

VLCD:
VRAD:
V380B:
VRTC:
VVCO:
I2C:
4/00021-2/FEA 209 544/19 E
DC voltage for the display that controls the contrast.
DC voltage for the radio part except the synthesiser. 3.80 ± 0.20 V
DC voltage for the radio part. 3.80 ± 0.20 V
DC voltage for the real time clock. 2.35 ± 0.15 V
DC voltage for the synthesiser. 3.80 ± 0.10 V
Communications standard for two-way communication using only 2 wires,
clock and data.
Trouble Shooting Guide, Standard
3(29)