GH688.pdf

GH688,GA628, Standard Electrical Repairs

Approved according to 1776-2/FEA 209 544

Trouble-shooting

instruction

GH 688/GA 628

Standard electrical repairs

4/00021-2/FEA 209 544/1.G

GH688,GA628, Standard Electrical Repairs

Table of contents

1 Conditions .......................................................................................... 3

1.1 Component classes. ......................................................................... 3

1.2 Abbreviations. ................................................................................. 4

1.3 Pin placements ................................................................................ 6

2 No serv or can´t place a call. ............................................................ 8

3 Doesn’t start. ................................................................................... 13

4 Audio. ............................................................................................... 22

5 Display. ............................................................................................ 30

6 Charging. ......................................................................................... 38

7 SIM fault (“Insert card”). .............................................................. 43

8 Keyboard. ........................................................................................ 48

9 Illumination and buzzer. ................................................................ 55

10 RTC .................................................................................................. 63

11 Component lists ............................................................................... 65

11.1 Explanation ................................................................................... 65

11.2 Mounting drawing tables ............................................................. 66

GH688 .............................................................................................. 66

GA628 .............................................................................................. 66

11.3 Component list GH688 ................................................................. 67

11.3.1 Revision change tables GH688 ......................................................... 80

Revision change table for

2/ROA 117 3307/1 and 2/ROA 117 3307/5, 2/ROA 117 3307/3 80

Revision change table for

2/ROA 117 3307/4 2/ROA 11 73307/6 ............. 84

11.4 Component list GA628 ................................................................. 88

11.4.1 Revision change tables GA628 ....................................................... 100

Revision change table for

2/ROA 117 3308/1, 2/ROA 117 3308/2 .......... 100

Revision change table for

2/ROA 117 3308/3, 2/ROA 117 3308/4 .......... 104

Revision change table for

2/ROA 117 3308/5, 2/ROA 117 3308/7 .......... 109

4/00021-2/FEA 209 544/1.G

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GH688,GA628, Standard Electrical Repairs

1 Conditions

1.1 Component classes.

All the components in the phone are divided into classes and after every component

in the troubleshooting guide you have a class written. The components are divided

into four classes: A, B, C and D.The class of the component depends on how much

of the phone’s performance is affected when replacing it.

Class A and B: A test call towards the “real” net (not only towards a GSM test

instrument) and run it through the normal tests is enough to verify the

functionality since the performance of the phone is only slightly

affected.

Class C:

Since the tolerances of the component are so great it can substantially

affect the performance of the phone you need to calibrate it at station

level after replacing the component.

Class D:

Class D components need to be calibrated at board level using very

advanced equipment and may therefore not be replaced .

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GH688,GA628, Standard Electrical Repairs

1.2 Abbreviations.

The power module at some phones.

Crystal.

Capacitor.

Digital circuit.

Over voltage protection.

VCO.

Buzzer, LED, pads for display.

Connector.

Coil.

Analogue circuit.

Resistor.

Keyboard pads.

BALUN. A circuit that converts a signal from balanced to unbalanced or the

opposite.

Transistor or diode.

Contact surface at the circuit board.

Filter.

AGND:

Ground for analogue signals.

DCIO:

DC voltage used for charging the battery through the system connector.

DCON:

Logical signal from the processor that keeps the phone running after

you’ve released the On/Off key.

EXTAUD: Input signal at the system connector that the processor uses to deter-

mine if there’s any external audio equipment attached.

EXTAUDI: The same signal as the EXTAUD signal but at the processor side.

GND:

Ground.

LED3K:

Logical signal used to activate the background illumination.

ONSRQ: Voltage from the On/Off key that starts the phone.

PORTHF: Input signal at the system connector that the processor uses to deter-

mine if there’s any handsfree equipment attached.

PHF1:

The same signal as PORTHF but at the processor side.

REGON: Logical signal that activates the voltage regulators.

RTC:

Real time clock. The clock that keeps track of time and date.

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GH688,GA628, Standard Electrical Repairs

SIMCLK: Clock signal from the processor used for communications with the

SIM.

SIMDAT: Data signal from the processor used for communications with the SIM.

SIMRST: Reset signal from the processor used for communications with the

SIM.

SIMVCC: Feed voltage for the SIM.

SWDC:

Switched VBATT.

VANA:

DC voltage for the analogue part of the logic (N800).

VBATT:

Battery voltage.

VDIG:

DC voltage for the processor and memory.

VDSP:

DC voltage for the DSP (Digital Signal Processor).

VLCD:

DC voltage for the display that controls the contrast.

VRAD:

DC voltage for the radio part except the synthesizer.

VRPAD:

DC voltage for the radio part in D600 (also used for the top diode and

the buzzer).

VRTC:

DC voltage for the real time clock.

VSIMPAD: VDIG voltage that has been switched up to 5V used for SIM.

VVCO:

DC voltage for the synthesizer.

I2C:

Two line serial communications standard using one clock and one data

line.

LO:

Local oscillator.

PWM:

Pulse width modulation.

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