Nokia 232, 239 Service Manual chh7

After Sales Technical Documentation

HANDSFREE DESKTOP

CHARGER

CHH–7

Original, 11/94 NMP Part No. 0275012

Handsfree Desktop Charger CHH–7

AMENDMENT RECORD SHEET

After Sales

Technical Documentation

Amendment
Number

Date Inserted By Comments

Original, 11/94Page 2

After Sales
Technical Documentation

Handsfree Desktop Charger CHH–7

HANDSFREE DESKTOP CHARGER CHH–7

CONTENTS

Page No

Introduction 5
Technical Summary 5

Operation 5
List of Modules 5
Basic Specifications 6

Technical Specifications 6

Modes of Operation 6
DC Characteristics 7
AC Characteristics 8
External Signals and Connections 9
Internal Signals and Connections 11
Mechanical Characteristics 12
User Interface Features 12

Charge States and Charge Control 13
Charge Indication to User 13

Environmental Conditions 15

Temperature Conditions 15

Functional Description 16

Circuit Description (DC3H) 18

Control Logic 18
Watchdog Function 21
Switch Mode Power Supply (SMPS) 21
Battery Charging 21
Spare Battery Discharging 22
Microphone Amplifier and Corresponding Switches 22
Speaker Amplifier and Corresponding Switches 22

Circuit Description (DC4H) 22

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Handsfree Desktop Charger CHH–7

Technical Documentation

Assembly 23
DC3H ModuleParts List 24
DC4H Module Parts List 32

After Sales

List of Figures

Figure 1: Block Diagram 16
Figure 2: Component Location Diagram 17
Figure 3: Exploded View 23
Figure 4: DC3H Circuit Diagram (Sheet 1) 33
Figure 5: DC3H Circuit Diagram (Sheet 2) 34
Figure 6: DC4H Circuit Diagram (Sheet 3) 35

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After Sales
Technical Documentation

Introduction

The CHH–7 Handsfree Desktop Charger provides both charging and
handsfree facilities. The charger enables a phone plus a spare battery to
be charged; the spare battery is charged after the phone battery has been
charged. CHH–7 can only be powered by the AC Power Supply
(ACS–6U/X/E); the supply is connected to the charger via a socket at the
rear of the charger.

Analogue data accessories may be used in conjunction with the
Handsfree Desktop Charger; a connector at the rear of the charger is
provided for this purpose.

The BABT approved version of CHH–7 is known as CHH–7X. Since both
units are technically identical, all references to CHH–7 equally apply to
CHH–7X.

Handsfree Desktop Charger CHH–7

Technical Summary

Operation

CHH–7 consists of a spare battery charging control processor, charging
indicators and a switched mode power supply for charging the phone and
the spare battery. The unit has an in–built hf–speaker and hf–microphone
but the handsfree function is generated in the phone. There are also
three operating buttons: the front one is a MUTE button for the CHH–7
microphone; the middle one is for redialling the last number dialled; and
the rear one is for selecting the spare battery discharge.

List of Modules

Table 1. List of Modules

NAME OF MODULE TYPE

CODE

HF Deskstand Charger CHH–7 0675040 Fully Assembled Charger
HF Desktop Charger and

Connector Module
HF Desktop Charger DC3H 0200334 Main Electronic Components and Connector

DCXH 0200335 A single PCB biscuit containing both the HF Desktop

MATERIAL

CODE

NOTES

Charger and Connector Module

Connector Module DC4H 0200295 System Connectors, Data Buffer and Noise Comp
Assembly Parts MCHH7 0260338 Mechanical Parts,Speaker, Microphone and Flex Foils

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Handsfree Desktop Charger CHH–7

Basic Specifications

Table 2. Basic Specifications

Power Consumption 13W max.
Input Voltage Range 13.5V to 21.0V

After Sales

Technical Documentation

Battery Charger: Output Voltage

Output Current

Maximum Charging Time (empty battery): BTH–8S (400mAh): 45min

Maximum Discharging Time (full battery): BTH–8S (400mAh): 3h 30min

Operating Temperature +5C to +55C
Charging Temperature +5C to +45C (40C when fitting battery)
Speaker Output Power nominal: 1W / 8ohm
External Main Dimensions 43mm (H) x 167mm (W) x 113mm (D)
Weight 360g

10.0V to 13.0V
730mA to 870mA

BTH–8H (500mAh): 55min
BTH–8SM (800mAh): 70min
BTH–8HM (1100mAh): 100min

BTH–8H (500mAh): 4h 20min
BTH–8SM (800mAh): 7h
BTH–8HM (1100mAh): 8h 40min

NOTE: To ensure the battery is fully charged, it is recommended to

continue charging for 2 to 3 hours after a fast charge has
been completed.

Technical Specifications

Modes of Operation

Power Off Mode: The unit receives no power at the DC–

connector.

Standby Mode: The unit receives the supply voltage at

the DC–connector. The processor is
running but because there isn’t a phone
or spare battery in the cradle, the
charger remains off and the audio
functions are inactive.

Active Mode: The telephone or spare battery is in the

cradle so the charging functions are
active. Normally the handsfree speaker
is muted. During a call and during the
key beeps or alarming tones the
speaker and corresponding audio
switches are open.

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After Sales
Technical Documentation

DC Characteristics

Table 3. Supply Voltages and Power Consumption on the Connectors of CHH–7

Handsfree Desktop Charger CHH–7

CONNECTOR

Pin/Connector

DC
1 / X100

SPARE
BATTERY

X101, X102
X103, X104

SYSTEM
10 / X701

DATA Analogue
2 / X510

Table 4. Supply Voltages and Power Consumptions on the DC3H–module

SYMBOL/

MODULE

+VI Power Supply 13.5V 13.8V 21.0V

+VCC Charging voltage for the

+10VA Supply for logic and

+10VAS Switched supply for logic

+5V Supply for logic

+5VREF Reference voltage for uP 4.9V 5.0V 5.1V

+5VLD Supply voltage for LEDs 4.9V 5.0V 5.1V

+5VAN Supply for analogue parts 4.6V 5.0V 5.1V

+VAREF Reference voltage for

LINE SYMBOL MINIMUM TYPICAL/

VDC
Input Voltage
Input Power

VBAT
Charging:
Output Voltage
Output Current
Discharging:
Input Voltage
Input Current

VC
Charging:
Output Voltage
Output Current

VD
Output Voltage
Output Current

PARAMETER MINIMUM TYPICAL/

battery

analogue parts

and analogue parts

parts

analogue parts

13.5V 13.8V 21.0V

11.0V
730mA

5.0V
130mA

11.0V
730mA

9.6V 10.0V 10.4V

10.3V
730mA

9.6V 10.0V 10.4V

9.1V 9.8V 10.2V

4.9V 5.0V 5.1V

2.2V 2.5V 2.7V

NOMINAL

12.2V
800mA

6.0V
160mA

12.2V
800mA

NOMINAL

11.5V
800mA

MAXIMUM

13.0W

13.0V
870mA

7.5V
200mA

13.0V
870mA

50.0mA

MAXIMUM

13W

13.3V
870mA

250mA

250mA

35mA

1.5mA

30mA

1mA

0.1mA

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Handsfree Desktop Charger CHH–7

AC Characteristics

Table 5. External Microphone signal

XMIC (1 kHz) TYPICAL/NOMINAL

After Sales

Technical Documentation

Cable level
0 dBmO

Table 6. Handsfree Microphone Signal

HFMIC (1 kHz) TYPICAL/NOMINAL

MRP +15.3dBPa / 50 cm (Mic Ref Point)
HFMIC input –4.7dBPa (approx 20dB attenuation)
Gain for HFMIC 40dB
Cable Level 200mV

Table 7. External Earphone Signal

XEAR (1 kHz) TYPICAL/NOMINAL

Cable Level
0 dBmO

200mV
415mV

130mV
411mV

Table 8. Handsfree Speaker Signal

HFSP (1kHz) TYPICAL/NOMINAL

Cable Level 130mV
Gain for HFSP 23dB

Table 9. Audio Specifications

f = 1 kHz MINIMUM TYPICAL/NOMINAL MAXIMUM

HF Microphone Sensitivity (0dB = 1V/Pa) –44dB –42dB –40dB
Sending Idle Noise –61dBmO
HF Speaker: SPL (1W @ 1m) +78dB +80dB +82dB
Receiving Idle Noise –52dBPa (A)
Speaker Output Power 1W/8Ω

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After Sales

Handsfree Desktop Charger CHH–7

Technical Documentation

External Signals and Connections

Table 10. List of External Connectors

CONNECTOR MODULE NOTES DESCRIPTION

SYSTEM DC4H CHH–7 <–––> Phone 10 connections
SP ARE BATTERY DC3H CHH–7 <–––> Spare Battery 4 contact springs
DATA DC3H CHH–7 <–––> Data Accessory 10 pins modular connector
DC DC3H CHH–7 <–––> Power Supply 6.3 mm DC–Jack

Table 11. DC Connector X100

PIN LINE/

SYMBOL

1 VDC Supply voltage

Supply power

2 DGND Power supply ground 0V 0V 0V

CONTACT/

SPRING

X104 GND Supply power ground 0V 0V 0V
X103 BTEMP Battery temp sensing 2.47V
X102 BSI Battery size

X101 VBAT Charging voltage

LINE/

SYMBOL

PARAMETER MINIMUM TYPICAL/

NOMINAL

13.5V 13.8V 21.0V

Table 12. Spare Battery Connector X101, ....X104

PARAMETER MINIMUM TYPICAL/

NOMINAL

613mV (400mAh)

identification.

Charging current

11V
730mA

764mV (500mAh)

1.53V (800mAh)

2.29V (1100mAh)
12V

800mA

MAXIMUM

13.0W

MAXIMUM

13V
870mA

Table 13. System Connector X701

PIN LINE

SYMBOL

5 GND Power supply ground 0V 0V 0V
9 XMIC Microphone signal

8 AGND analogue ground 0V 0V 0V
7 M2BUS Serial bidirection data 0V

PARAMETER MINIMUM TYPICAL/

NOMINAL

200mV
dc–level
output impedance

3.0V
0V

3.6V

2.5V

MAXIMUM

700Ω

0.7V Input ”0” state

5.25V Input ”1” state

0.35V Output ”0” state

5.25V Output ”1” state

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Handsfree Desktop Charger CHH–7

Table 13. System Connector X701 (continued)

After Sales

Technical Documentation

PIN

SYMBOL

3 HOOK Selects handsfree

operation

6 VC Supply / Charging 11V

10 GND Power supply ground 0V 0V 0V
4 XEAR /

HFJPWR

1 VC Supply / Charging 11V

2 XEXAUD Not used

PIN LINE

SYMBOL

2 +VD Supply voltage

3 DGND Supply power ground 0V 0V 0V

Earphone signal
dc–level
input impedance 10kΩ

CHH–7 power switch 5.0V (power off)

Table 14. Data Connector X510

PARAMETER MINIMUM TYPICAL/

Supply current

MINIMUMPARAMETERLINE

NOMINAL

0V 0V 0V

12V

730mA

730mA

9.6V 10.0V 10.4V

800mA

130mV

2.5V

2.5V (power on)

12V

800mA

NOMINAL

13V
830mA

0.8V (test mode for
power off watch–dog)

13V
870mA

50mA

MAXIMUMTYPICAL/

MAXIMUM

4 M2BUS Serial bidirection data 0V

3.0V
0V

3.6V
1, 5 Not Used
6 Not Used
7 AGND analogue ground 0V 0V 0V
8 XMIC Microphone signal

dc–level
output impedance

9 XEAR Earphone signal

dc–level
input impedance 10kΩ

0.2V

4.7V

200mV

2.5V

130mV

2.5V

0.7V Input ”0” state

5.25V Input ”1” state

0.35V Output ”0” state

5.25V Output ”1” state

700Ω

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